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DESI 2024 VI: cosmological constraints from the measurements of baryon acoustic oscillations J. Cosmol. Astropart. Phys. (IF 5.3) Pub Date : 2025-02-12 A.G. Adame, J. Aguilar, S. Ahlen, S. Alam, D.M. Alexander, M. Alvarez, O. Alves, A. Anand, U. Andrade, E. Armengaud, S. Avila, A. Aviles, H. Awan, B. Bahr-Kalus, S. Bailey, C. Baltay, A. Bault, J. Behera, S. BenZvi, A. Bera, F. Beutler, D. Bianchi, C. Blake, R. Blum, S. Brieden, A. Brodzeller, D. Brooks, E. Buckley-Geer, E. Burtin, R. Calderon, R. Canning, A. Carnero Rosell, R. Cereskaite, J.L. Cervantes-Cota
We present cosmological results from the measurement of baryon acoustic oscillations (BAO) in galaxy, quasar and Lyman-α forest tracers from the first year of observations from the Dark Energy Spectroscopic Instrument (DESI), to be released in the DESI Data Release 1. DESI BAO provide robust measurements of the transverse comoving distance and Hubble rate, or their combination, relative to the sound
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Super sample covariance and the volume scaling of galaxy survey covariance matrices J. Cosmol. Astropart. Phys. (IF 5.3) Pub Date : 2025-02-12 Greg Schreiner, Alex Krolewski, Shahab Joudaki and Will J. Percival
Super sample covariance (SSC) is important when estimating covariance matrices using a set of mock catalogues for galaxy surveys. If the underlying cosmological simulations do not include the variation in background parameters appropriate for the simulation sizes, then the scatter between mocks will be missing the SSC component. The coupling between large and small modes due to non-linear structure
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A semi-analytic estimate for the effective sound speed counterterm in the EFTofLSS J. Cosmol. Astropart. Phys. (IF 5.3) Pub Date : 2025-02-12 Caio Nascimento, Drew Jamieson, Matthew McQuinn and Marilena Loverde
The Effective Field Theory of Large Scale Structure (EFTofLSS) has found tremendous success as a perturbative framework for the evolution of large scale structure, and it is now routinely used to compare theoretical predictions against cosmological observations. The model for the total matter field includes one nuisance parameter at 1-loop order, the effective sound speed, which can be extracted by
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Investigating late-time dark energy and massive neutrinos in light of DESI Y1 BAO J. Cosmol. Astropart. Phys. (IF 5.3) Pub Date : 2025-02-12 João Rebouças, Diogo H.F. de Souza, Kunhao Zhong, Vivian Miranda and Rogerio Rosenfeld
Baryonic Acoustic Oscillation (BAO) data from the Dark Energy Spectroscopic Instrument (DESI), in combination with Cosmic Microwave Background (CMB) data and Type Ia Supernovae (SN) luminosity distances, suggests a dynamical evolution of the dark energy equation of state with a phantom phase (w < -1) in the past when the so-called w0wa parametrization w(a) = w0 + wa(1-a) is assumed. In this work, we
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Free streaming in warm wave dark matter J. Cosmol. Astropart. Phys. (IF 5.3) Pub Date : 2025-02-12 Siyang Ling and Mustafa A. Amin
We provide a framework for numerically computing the effects of free-streaming in scalar fields produced after inflation. First, we provide a detailed prescription for setting up initial conditions in the field. This prescription allows us to specify the power spectra of the fields (peaked on subhorizon length scales and without a homogeneous field mode), and importantly, also correctly reproduces
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Warm Hawking relics from primordial black hole domination J. Cosmol. Astropart. Phys. (IF 5.3) Pub Date : 2025-02-12 Christopher J. Shallue, Julian B. Muñoz and Gordan Z. Krnjaic
We study the cosmological impact of warm, dark-sector relic particles produced as Hawking radiation in a primordial-black-hole-dominated universe before big bang nucleosynthesis. If these dark-sector particles are stable, they would survive to the present day as Hawking relicsand modify the growth of cosmological structure. We show that such relics are produced with much larger momenta, but in smaller
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Gravitational radiation from binary systems in unimodular gravity J. Cosmol. Astropart. Phys. (IF 5.3) Pub Date : 2025-02-12 Indranil Chakraborty, Soumya Jana and Subhendra Mohanty
Unimodular gravity (UG) is classically considered identical to General Relativity (GR). However, due to restricted diffeomorphism symmetry, the Bianchi identites do not lead to the conservation of energy-momentum tensor. Thus, the conservation of energy-momentum tensor needs to be separately assumed in order to reconcile with GR. Relaxing this assumption, one finds that the conservation violation can
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Charged binaries in gravitational tides J. Cosmol. Astropart. Phys. (IF 5.3) Pub Date : 2025-02-12 Elisa Grilli, Marta Orselli, David Pereñiguez and Daniele Pica
Next-generation low-frequency interferometers are expected to detect binary systems near supermassive black holes, where tidal effects can alter significantly the binary's motion. This motivates a broader investigation of how external gravitational fields influence the dynamics of physical systems. In this work, we consider a charged black hole binary system subject to a gravitational tide. We first
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Disclosing the catalog pulsars dominating the Galactic positron flux J. Cosmol. Astropart. Phys. (IF 5.3) Pub Date : 2025-02-12 Luca Orusa, Silvia Manconi, Fiorenza Donato and Mattia Di Mauro
The cosmic-ray flux of positrons is measured with high precision by the space-borne particle spectrometer AMS-02. The hypothesis that pulsars and their nebulae can significantly contribute to the excess of the AMS-02 positron flux has been consolidated after the observation of a γ-ray emission at GeV and TeV energies of a few degree size around a few sources, that provide indirect evidence that electron
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Probing the Cosmological Principle with weak lensing shear J. Cosmol. Astropart. Phys. (IF 5.3) Pub Date : 2025-02-11 James Adam, Roy Maartens, Julien Larena and Chris Clarkson
The Cosmological Principle is a cornerstone of the standard model of cosmology and shapes how we view the Universe and our place within it. It is imperative, then, to devise multiple observational tests which can identify and quantify possible violations of this foundational principle. One possible method of probing large-scale anisotropies involves the use of weak gravitational lensing. We revisit
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Indirect detection of dark matter absorption in the Galactic Center J. Cosmol. Astropart. Phys. (IF 5.3) Pub Date : 2025-02-11 Kimberly K. Boddy, Bhaskar Dutta, Addy J. Evans, Wei-Chih Huang, Stacie Moltner and Louis E. Strigari
We consider the nuclear absorption of dark matter as an alternative to the typical indirect detection search channels of dark matter decay or annihilation. In this scenario, an atomic nucleus transitions to an excited state by absorbing a pseudoscalar dark matter particle and promptly emits a photon as it transitions back to its ground state. The nuclear excitation of carbon and oxygen in the Galactic
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Primordial black hole formation from type II fluctuations with primordial non-Gaussianity J. Cosmol. Astropart. Phys. (IF 5.3) Pub Date : 2025-02-11 Masaaki Shimada, Albert Escrivà, Daiki Saito, Koichiro Uehara and Chul-Moon Yoo
This study investigates the formation of primordial black holes (PBHs) resulting from the collapse of adiabatic fluctuations with large amplitudes and non-Gaussianity. Ref. [1] showed that fluctuations with large amplitudes lead to the formation of type B PBHs, characterized by the existence of the bifurcating trapping horizons, distinct from the more common type A PBHs without a bifurcating trapping
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The cosmological flow: a systematic approach to primordial correlators J. Cosmol. Astropart. Phys. (IF 5.3) Pub Date : 2025-02-11 Lucas Pinol, Sébastien Renaux-Petel and Denis Werth
The time evolution of primordial fluctuations conceals a wealth of insights into the high-energy physics at play during the earliest moments of our Universe, which is ultimately encoded in late-time spatial correlation functions. However, the conventional procedure to compute them is technically challenging, and a complete dictionary mapping the landscape of inflationary theories and the corresponding
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BullFrog: multi-step perturbation theory as a time integrator for cosmological simulations J. Cosmol. Astropart. Phys. (IF 5.3) Pub Date : 2025-02-11 Cornelius Rampf, Florian List and Oliver Hahn
Modelling the cosmic large-scale structure can be done through numerical N-body simulations or by using perturbation theory. Here, we present an N-body approach that effectively implements a multi-step forward model based on Lagrangian Perturbation Theory (LPT) in a ΛCDM Universe. This is achieved by introducing the second-order accurate BullFrog integrator, which automatically performs 2LPT time steps
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First direction sensitive search for dark matter with a nuclear emulsion detector at a surface site J. Cosmol. Astropart. Phys. (IF 5.3) Pub Date : 2025-02-07 A. Umemoto, T. Naka, T. Shiraishi, O. Sato, T. Asada, G. De Lellis, R. Kobayashi, A. Alexandrov, V. Tioukov, N. D'Ambrosio and G. Rosa
Fine-grained nuclear emulsion films have been developed as a tracking detector with nanometric spatial resolution to be used in direction-sensitive dark matter searches, thanks to novel readout technologies capable of exploiting this unprecedented resolution. Emulsion detectors are time insensitive. Therefore, a directional dark matter search with such detector requires the use of an equatorial telescope
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Noncanonical warm inflation with nonminimal derivative coupling J. Cosmol. Astropart. Phys. (IF 5.3) Pub Date : 2025-02-07 Xiao-Min Zhang, Run-Qing Zhao, Zhi-Peng Peng, Xi-Bin Li, Yun-Cai Feng, Peng-Cheng Chu and Yi-Hang Xing
This study extended noncanonical warm inflation to the nonminimal derivative coupling scenario. The fundamental equations, including the evolution equations and the slow roll equations of this new framework, were derived. The enlarged damping term, which encompasses both gravitationally enhanced friction and thermal damping, resulted in a well overdamped inflationary process, ensuring that the slow
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Schwarzschild black hole in galaxies surrounded by a dark matter halo J. Cosmol. Astropart. Phys. (IF 5.3) Pub Date : 2025-02-07 Ahmad Al-Badawi, Sanjar Shaymatov and Yassine Sekhmani
In this paper, we derive a novel Schwarzschild-like black hole (BH) solution describing a static and asymptotically flat BH surrounded by a dark matter (DM) halo with a Dehnen-type density distribution in the surrounding environment. We investigate the properties of the obtained BH by studying the curvature properties and energy conditions in Einstein gravity. Furthermore, we explore the features of
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Disformal gravitational waves J. Cosmol. Astropart. Phys. (IF 5.3) Pub Date : 2025-02-07 Jibril Ben Achour, Mohammad Ali Gorji and Hugo Roussille
Contrary to conformal transformations, disformal transformations can change the principal null directions of a spacetime geometry. Thus, depending on the frame a gravitational wave (GW) detector minimally couples to, the properties of GWs may change under a disformal transformation. In this paper, we provide necessary and sufficient conditions which determine whether GWs change under disformal transformations
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Chiral dark matter and radiative neutrino masses from gauged U(1) symmetry J. Cosmol. Astropart. Phys. (IF 5.3) Pub Date : 2025-02-06 K.S. Babu, Shreyashi Chakdar and Vishnu P.K.
We propose a class of dark matter models based on a chiral U(1) gauge symmetry acting on a dark sector. The chiral U(1) protects the masses of the dark sector fermions, and also guarantees the stability of the dark matter particle by virtue of an unbroken discrete 𝒵N gauge symmetry. We identify 38 such U(1) models which are descendants of a chiral SU(3) × SU(2) gauge symmetry, consisting of a minimal
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Neutrino masses and mixing from milli-charged dark matter J. Cosmol. Astropart. Phys. (IF 5.3) Pub Date : 2025-02-06 Sudip Jana, Michael Klasen, Vishnu P.K. and Luca Paolo Wiggering
We propose a simple extension to the Standard Model, wherein neutrinos naturally attain small Majorana masses through a one-loop radiative mechanism featuring particles within the loops characterized by milli-charges. Unlike the conventional scotogenic model, our approach avoids imposing a discrete symmetry or expanding the gauge sector. The minuscule electric charges ensure the stability of the lightest
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Forecast analysis of astrophysical stochastic gravitational wave background beyond general relativity: a case study on brans-dicke gravity J. Cosmol. Astropart. Phys. (IF 5.3) Pub Date : 2025-02-05 Ran Chen, Zhao Li, Yin-Jie Li, Yi-Ying Wang, Rui Niu, Wen Zhao and Yi-Zhong Fan
Scalar-tensor gravity, exemplified by Brans-Dicke (BD) gravity, introduces additional scalar polarization modes that contribute scalar radiation alongside tensor modes. We conduct a comprehensive analysis of how gravitational wave generation and propagation effects under Brans-Dicke gravity are encoded into the astrophysical stochastic gravitational wave background (AGWB). We perform end-to-end analyses
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Revisiting primordial black holes formation from preheating instabilities: the case of Starobinsky inflation J. Cosmol. Astropart. Phys. (IF 5.3) Pub Date : 2025-02-05 Daniel del-Corral, Paolo Gondolo, K. Sravan Kumar and João Marto
In recent years, the formation of primordial black holes (PBH) in the early universe inflationary cosmology has garnered significant attention. One plausible scenario for primordial black hole (PBH) formation arises during the preheating stage following inflation. Notably, this scenario does not necessitate any ad-hoc fine-tuning of the scalar field potential. This paper focuses on the growth of primordial
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Wide binary evaporation by dark solitons: implications from the GAIA catalog J. Cosmol. Astropart. Phys. (IF 5.3) Pub Date : 2025-02-04 Qiming Qiu, Yu Gao, Haijun Tian, Kechen Wang, Zihang Wang and Xiangming Yang
An analytic calculation is given for binary star evaporation under the tidal perturbation from randomly distributed, spatially extended dark objects. In particular, the Milky Way's wide binary star population is susceptible to such disruption from dark matter solitons of comparable and larger sizes. We identify high-probability `halo-like' wide binaries in GAIA EDR3 with separations larger than 0.1
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Confronting new NICER mass-radius measurements with phase transition in dense matter and twin compact stars J. Cosmol. Astropart. Phys. (IF 5.3) Pub Date : 2025-02-04 Jia Jie Li, Armen Sedrakian and Mark Alford
The (re)analysis of data on the X-ray emitting pulsars PSR J0030+0451 and J0740+6620, as well as new results on PSR J0437-4715 and J1231-1411, are confronted with the predictions of the equation of state (EoS) models allowing for strong first-order phase transition for the mass-radius (M-R) diagram. We use models that are based on a covariant density functional (CDF) EoS for nucleonic matter at low
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Gravitational Faraday-Cartan effect beyond gravitomagnetism due to dark matter intrinsic spin J. Cosmol. Astropart. Phys. (IF 5.3) Pub Date : 2025-02-04 Francisco Barriga, Fernando Izaurieta, Samuel Lepe, Paola Meza, Jethzael Muñoz, Cristian Quinzacara and Omar Valdivia
We show that the spin of dark matter induces a gravitational analog of the electromagnetic Faraday effect, where the polarization of gravitational waves undergoes a rotation as they propagate through a dark matter halo with a non-vanishing axial hypermomentum. An expression for the gravitational rotation angle is provided, which is analogous to the Faraday rotation in optics, and evaluate its significance
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Neural Networks for cosmological model selection and feature importance using Cosmic Microwave Background data J. Cosmol. Astropart. Phys. (IF 5.3) Pub Date : 2025-02-04 I. Ocampo, G. Cañas-Herrera and S. Nesseris
The measurements of the temperature and polarisation anisotropies of the Cosmic Microwave Background (CMB) by the ESA Planck mission have strongly supported the current concordance model of cosmology. However, the latest cosmological data release from ESA Planck mission still has a powerful potential to test new data science algorithms and inference techniques. In this paper, we use advanced Machine
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Successful νp-process in neutrino-driven outflows in core-collapse supernovae J. Cosmol. Astropart. Phys. (IF 5.3) Pub Date : 2025-02-04 Alexander Friedland, Payel Mukhopadhyay and Amol V. Patwardhan
The origin of the solar system abundances of several proton-rich isotopes, especially 92,94Mo and 96,98Ru, has been an enduring mystery in nuclear astrophysics. An attractive proposal to solve this problem is the νp-process, which can operate in neutrino-driven outflows in a core-collapse supernova after the shock is launched. Years of detailed studies, however, have cast doubt over the ability of
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Dynamics of the response of dark matter halo to galaxy evolution in IllustrisTNG J. Cosmol. Astropart. Phys. (IF 5.3) Pub Date : 2025-02-04 Premvijay Velmani and Aseem Paranjape
We present the dynamical evolution of the dark matter's relaxation response to galaxies and their connection to the astrophysical properties as simulated in the IllustrisTNG suite of cosmological hydrodynamical simulations. Our results show that the radially-dependent linear relaxation relation model from our previous work is applicable at least from redshift z=5. We focus on the offset parameter q0
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A global fit of non-relativistic effective dark matter operators including solar neutrinos J. Cosmol. Astropart. Phys. (IF 5.3) Pub Date : 2025-02-04 N.P. Avis Kozar, Pat Scott and A.C. Vincent
We perform a global fit of dark matter interactions with nucleons using a non-relativistic effective operator description, considering both direct detection and neutrino data. We examine the impact of combining the direct detection experiments CDMSlite, CRESST-II, CRESST-III, DarkSide-50, DarkSide-50-S2-Only, LUX, LZ, PandaX-II, PandaX-4T, PICO-2L, PICO-60, SIMPLE, XENON100, and XENON1T along with
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Gravitational waves from dark domain walls J. Cosmol. Astropart. Phys. (IF 5.3) Pub Date : 2025-01-31 Ø. Christiansen, J. Adamek, F. Hassani and D. Mota
For most of cosmic history, the evolution of our Universe has been governed by the physics of a `dark sector', consisting of dark matter and dark energy, whose properties are only understood in a schematic way. The influence of these constituents is mediated exclusively by the force of gravity, meaning that insight into their nature must be gleaned from gravitational phenomena. The advent of gravitational-wave
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An analytically tractable marked power spectrum J. Cosmol. Astropart. Phys. (IF 5.3) Pub Date : 2025-01-31 Haruki Ebina and Martin White
The increasing precision of cosmology data in the modern era is calling for methods to allow the extraction of non-Gaussian information using tools beyond two-point statistics. The marked power spectrum has the potential to extract beyond two-point information in a computationally efficient way while using much of the infrastructure already available for the power spectrum. In this work we explore
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The self-attractive ultralight axion and its time scale of collapsing in general relativistic framework J. Cosmol. Astropart. Phys. (IF 5.3) Pub Date : 2025-01-31 Takeshi Fukuyama
The formation of supermassive black holes (SMBHs) at high redshift z by ultralight axion dark matter (DM) is discussed in the general relativistic framework. The critical condition of collapsing of self-attracting DM in non-relativistic treatment corresponds to dust particle, which allows to estimate the time scale of the SMBH formation and the its length scale in the general relativistic framework
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Impact of radiative cooling on the magnetised geometrically thin accretion disc around Kerr black hole J. Cosmol. Astropart. Phys. (IF 5.3) Pub Date : 2025-01-31 Indu K. Dihingia, Yosuke Mizuno, Christian M. Fromm and Ziri Younsi
It is believed that the spectral state transitions of the outbursts in X-ray binaries (XRBs) are triggered by the rise of the mass accretion rate due to underlying disc instabilities. Recent observations found that characteristics of disc winds are probably connected with the different spectral states, but the theoretical underpinnings of it are highly ambiguous. To understand the correlation between
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Neutrino cosmology after DESI: tightest mass upper limits, preference for the normal ordering, and tension with terrestrial observations J. Cosmol. Astropart. Phys. (IF 5.3) Pub Date : 2025-01-31 Jun-Qian Jiang, William Giarè, Stefano Gariazzo, Maria Giovanna Dainotti, Eleonora Di Valentino, Olga Mena, Davide Pedrotti, Simony Santos da Costa and Sunny Vagnozzi
The recent DESI Baryon Acoustic Oscillation measurements have led to tight upper limits on the neutrino mass sum, potentially in tension with oscillation constraints requiring ∑ mν ≳ 0.06 eV. Under the physically motivated assumption of positive ∑ mν, we study the extent to which these limits are tightened by adding other available cosmological probes, and robustly quantify the preference for the normal
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Reconstructing the inflaton potential: primordial black holes and gravitational waves in slow roll and ultra slow roll single field inflation J. Cosmol. Astropart. Phys. (IF 5.3) Pub Date : 2025-01-31 Gabriele Autieri and Michele Redi
We present new single field inflationary scenarios that produce the critical abundance of primordial black holes as dark matter reconstructing the inflaton potential from an input power spectrum. The method is exact in the slow roll approximation but remains effective even when the slow roll conditions are temporarily violated such as in ultra slow roll models. With this method we construct new ultra
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A natural explanation of the VPOS from multistate Scalar Field Dark Matter J. Cosmol. Astropart. Phys. (IF 5.3) Pub Date : 2025-01-31 Tula Bernal, Tonatiuh Matos and Leonardo San.-Hernandez
Observations with the Gaia satellite have confirmed that the satellite galaxies of the Milky Way are not distributed as homogeneously as expected. The same occurs in galaxies such as Andromeda and Centaurus A, where satellites around their host galaxies have been observed to have orbits aligned perpendicular to the galactic plane of the host galaxy. This problem is known for the Milky Way as Vast Polar
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DESI2024: Dark Energy Spectroscopic Instrument (DESI) survey, presentation of Year 1 results J. Cosmol. Astropart. Phys. (IF 5.3) Pub Date : 2025-01-30 Kyle Dawson and Nathalie Palanque-Delabrouille
The series of papers included in this special issue represent the first cosmological measurements from the Dark Energy Spectroscopic Instrument (DESI). These papers present the validation of the DESI clustering catalogs, the methodology for the cosmology measurements, and the full cosmology implications. These measurements were derived from a catalog of approximately 6.4 million extragalactic sources
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DESI 2024 IV: Baryon Acoustic Oscillations from the Lyman alpha forest J. Cosmol. Astropart. Phys. (IF 5.3) Pub Date : 2025-01-30 A.G. Adame, J. Aguilar, S. Ahlen, S. Alam, D.M. Alexander, M. Alvarez, O. Alves, A. Anand, U. Andrade, E. Armengaud, S. Avila, A. Aviles, H. Awan, S. Bailey, C. Baltay, A. Bault, J. Bautista, J. Behera, S. BenZvi, F. Beutler, D. Bianchi, C. Blake, R. Blum, S. Brieden, A. Brodzeller, D. Brooks, E. Buckley-Geer, E. Burtin, R. Calderon, R. Canning, A. Carnero Rosell, R. Cereskaite, J.L. Cervantes-Cota
We present the measurement of Baryon Acoustic Oscillations (BAO) from the Lyman-α(Lyα) forest of high-redshift quasars with the first-year dataset of the Dark Energy Spectroscopic Instrument (DESI). Our analysis uses over 420 000 Lyα forest spectra and their correlation with the spatial distribution of more than 700 000 quasars. An essential facet of this work is the development of a new analysis methodology
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The construction of large-scale structure catalogs for the Dark Energy Spectroscopic Instrument J. Cosmol. Astropart. Phys. (IF 5.3) Pub Date : 2025-01-30 A.J. Ross, J. Aguilar, S. Ahlen, S. Alam, A. Anand, S. Bailey, D. Bianchi, S. Brieden, D. Brooks, E. Burtin, A. Carnero Rosell, E. Chaussidon, T. Claybaugh, S. Cole, K. Dawson, A. de la Macorra, A. de Mattia, A. Dey, B. Dey, P. Doel, K. Fanning, S. Ferraro, J. Ereza, A. Font-Ribera, J.E. Forero-Romero, E. Gaztañaga, H. Gil-Marín, S.Gontcho A. Gontcho, A.X. Gonzalez-Morales, J. Guy, C. Hahn, S. Heydenreich
We present the technical details on how large-scale structure (LSS) catalogs are constructed from redshifts measured from spectra observed by the Dark Energy Spectroscopic Instrument (DESI). The LSS catalogs provide the information needed to determine the relative number density of DESI tracers as a function of redshift and celestial coordinates and, e.g., determine clustering statistics. We produce
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Spacetime surgery for black hole fireworks J. Cosmol. Astropart. Phys. (IF 5.3) Pub Date : 2025-01-23 Wei-Chen Lin, Dong-han Yeom and Dejan Stojkovic
We construct an explicit model for the black hole to white hole transition (known as the black hole fireworks scenario) using the cut-and-paste technique. We model a black hole collapse using the evolution of a time-like shell in the background of the loop quantum gravity inspired metric and then the space-like shell analysis to construct the firework geometry. Our simple and well-defined analysis
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Distinct photon-ALP propagation modes J. Cosmol. Astropart. Phys. (IF 5.3) Pub Date : 2025-01-23 Qing-Hong Cao, Zuowei Liu and Jun-Chen Wang
Measurement of cosmic photons may reveal their propagation in the interstellar environment, thereby offering a promising way to probe axions and axion-like particles (ALPs). Numerical methods are usually used to compute the propagation of the photon-ALP beam due to the complexity of both the interstellar magnetic field and the evolution equation. However, under certain conditions, the evolution equation
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Ultra slow-roll with a black hole J. Cosmol. Astropart. Phys. (IF 5.3) Pub Date : 2025-01-22 Lewis Croney, Ruth Gregory and Sam Patrick
We investigate ultra slow-roll inflation with a seed black hole in a de Sitter background. By numerically tracking transitions from slow-roll to ultra slow-roll inflation, we find that quasi-normal mode solutions of the scalar field are excited following the decay of the slow-roll attractor, depending on the mass of the black hole. For small black holes, the picture is similar to standard inflation
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ANNZ+: an enhanced photometric redshift estimation algorithm with applications on the PAU survey J. Cosmol. Astropart. Phys. (IF 5.3) Pub Date : 2025-01-22 Imdad Mahmud Pathi, John Y.H. Soo, Mao Jie Wee, Sazatul Nadhilah Zakaria, Nur Azwin Ismail, Carlton M. Baugh, Giorgio Manzoni, Enrique Gaztanaga, Francisco J. Castander, Martin Eriksen, Jorge Carretero, Enrique Fernandez, Juan Garcia-Bellido, Ramon Miquel, Cristobal Padilla, Pablo Renard, Eusebio Sanchez, Ignacio Sevilla-Noarbe and Pau Tallada-Crespí
annz is a fast and simple algorithm which utilises artificial neural networks (ANNs), it was known as one of the pioneers of machine learning approaches to photometric redshift estimation decades ago. We enhanced the algorithm by introducing new activation functions like tanh, softplus, SiLU, Mish and ReLU variants; its new performance is then vigorously tested on legacy samples like the Luminous Red
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Gravitino thermal production, dark matter, and reheating of the Universe J. Cosmol. Astropart. Phys. (IF 5.3) Pub Date : 2025-01-21 Helmut Eberl, Ioannis D. Gialamas and Vassilis C. Spanos
We present a full one-loop calculation of the gravitino thermal production rate, beyond the so-called hard thermal loop approximation, using the corresponding thermal spectral functions in numerical form on both sides of the light cone. This framework requires a full numerical evaluation. We interpret our results within the framework of a general supergravity-based model, remaining agnostic about the
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Prospects for cosmological research with the FAST array: 21-cm intensity mapping survey observation strategies J. Cosmol. Astropart. Phys. (IF 5.3) Pub Date : 2025-01-21 Jun-Da Pan, Peng-Ju Wu, Guo-Hong Du, Yichao Li and Xin Zhang
Precise cosmological measurements are essential for understanding the evolution of the universe and the nature of dark energy. The Five-hundred-meter Aperture Spherical Telescope (FAST), the most sensitive single-dish radio telescope, has the potential to provide the precise cosmological measurements through neutral hydrogen 21 cm intensity mapping sky survey. This paper primarily explores the potential
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Field-level simulation-based inference with galaxy catalogs: the impact of systematic effects J. Cosmol. Astropart. Phys. (IF 5.3) Pub Date : 2025-01-21 Natalí S.M. de Santi, Francisco Villaescusa-Navarro, L. Raul Abramo, Helen Shao, Lucia A. Perez, Tiago Castro, Yueying Ni, Christopher C. Lovell, Elena Hernández-Martínez, Federico Marinacci, David N. Spergel, Klaus Dolag, Lars Hernquist and Mark Vogelsberger
It has been recently shown that a powerful way to constrain cosmological parameters from galaxy redshift surveys is to train graph neural networks to perform field-level likelihood-free inference without imposing cuts on scale. In particular, de Santi et al. [58] developed models that could accurately infer the value of Ωm from catalogs that only contain the positions and radial velocities of galaxies
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Stellar-mass black-hole binaries in LISA: characteristics and complementarity with current-generation interferometers J. Cosmol. Astropart. Phys. (IF 5.3) Pub Date : 2025-01-21 R. Buscicchio, J. Torrado, C. Caprini, G. Nardini, N. Karnesis, M. Pieroni and A. Sesana
Stellar-mass black-hole binaries are the most numerous gravitational-wave sources observed to date. Their properties make them suitable for observation both by ground- and space-based detectors. Starting from synthetic catalogues constructed based on observational constraints from ground-based detectors, we explore the detection rates and the characteristic parameters of the stellar-mass black-hole
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Bridging dark energy and black holes with EFT: frame transformation and gravitational wave speed J. Cosmol. Astropart. Phys. (IF 5.3) Pub Date : 2025-01-21 Shinji Mukohyama, Emeric Seraille, Kazufumi Takahashi and Vicharit Yingcharoenrat
Typically, constraints on parameters of the effective field theory (EFT) of dark energy have been obtained in the Jordan frame, where matter fields are minimally coupled to gravity. To connect these constraints with those of the EFT of black hole perturbations with a timelike scalar profile, it is necessary to perform a frame transformation on the EFT in general. In this paper, we study the conformal/disformal
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Ultra-light dark matter with non-canonical kinetics reopening the mass window J. Cosmol. Astropart. Phys. (IF 5.3) Pub Date : 2025-01-21 Shiyun Lu, Amara Ilyas, Xiao-Han Ma, Bo Wang, Dongdong Zhang and Yi-Fu Cai
Fuzzy dark matter (FDM) with mass around 10-22 eV is viewed as a promising paradigm in understanding the structure formation of the local universe at small scales. Recent observations, however, begin to challenge FDM in return. We focus on the arguments between the solution to CDM small-scale curiosities and recent observations on matter power spectrum, and find its implication on an earlier formation
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High-redshift cosmography with a possible cosmic distance duality relation violation J. Cosmol. Astropart. Phys. (IF 5.3) Pub Date : 2025-01-21 José F. Jesus, Mikael J.S. Gomes, Rodrigo F.L. Holanda and Rafael C. Nunes
In this study, we used geometric distances at high redshifts (both luminosity and angular) to perform a cosmographic analysis with the Padé method, which stabilizes the behaviour of the cosmographic series in this redshift regime. However, in our analyses, we did not assume the validity of the Cosmic Distance Duality Relation (CDDR), but allowed for potential violations, such as dL(z) = η(z)(1+z)2dA(z)
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Revisiting primordial magnetic fields through 21-cm physics: bounds and forecasts J. Cosmol. Astropart. Phys. (IF 5.3) Pub Date : 2025-01-21 Arko Bhaumik, Debarun Paul and Supratik Pal
Primordial magnetic fields (PMFs) may significantly influence 21-cm physics via two mechanisms: (i) magnetic heating of the intergalactic medium (IGM) through ambipolar diffusion (AD) and decaying magnetohydrodynamic turbulence (DT), (ii) impact on the star formation rate density (SFRD) through small-scale enhancement of the matter power spectrum. In this analysis, we integrate both of these effects
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Gravitational waveforms from periodic orbits around a quantum-corrected black hole J. Cosmol. Astropart. Phys. (IF 5.3) Pub Date : 2025-01-21 Sen Yang, Yu-Peng Zhang, Tao Zhu, Li Zhao and Yu-Xiao Liu
Extreme mass-ratio inspirals are crucial sources for future space-based gravitational wave detections. Gravitational waveforms emitted by extreme mass-ratio inspirals are closely related to the orbital dynamics of small celestial objects, which vary with the underlying spacetime geometry. Despite the tremendous success of general relativity, there are unsolved issues such as singularities in both black
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Schwarzschild lensing from geodesic deviation J. Cosmol. Astropart. Phys. (IF 5.3) Pub Date : 2025-01-21 Zhao Li, Xiao Guo, Tan Liu, Tao Zhu and Wen Zhao
We revisit the gravitational lensing of light or gravitational waves by a Schwarzschild black hole in geometric optics. Rather than focusing on a single massless particle, we investigate the collective behavior of a congruence of light or gravitational rays, described by the geodesic deviation equation (GDE). By projecting GDE onto the Newman-Penrose tetrad, we decouple the equation and find an analytical
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Numerical simulation of common envelope stage in close binary systems: comparison between Newtonian and modified gravity J. Cosmol. Astropart. Phys. (IF 5.3) Pub Date : 2025-01-21 A.V. Astashenok, A.S. Baigashov, A.S. Tepliakov, K.P. Gusev and E.R. Shamardina
We consider the important stage in evolution of close binary system namely common envelope phase in framework of various models of modified gravity. The comparison of results between calculations in Newtonian gravity and modified gravity allows to estimate possible observational imprints of modified gravity. Although declination from Newtonian gravity should be negligible we can propose that due to
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Hot Casimir wormholes J. Cosmol. Astropart. Phys. (IF 5.3) Pub Date : 2025-01-21 Remo Garattini and Mir Faizal
In this paper, we have for the first time considered the consequences of finite temperature contributions to a traversable wormhole. This was done by using finite temperature generalization of the Casimir effect as a source of a hot traversable wormhole. To include finite temperature effects, we have considered the plates positioned either parametrically fixed or radially varying. Such results have
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Hamiltonian formalism for cosmological perturbations: fixing the gauge J. Cosmol. Astropart. Phys. (IF 5.3) Pub Date : 2025-01-21 Danilo Artigas, Julien Grain and Vincent Vennin
Cosmological perturbation theory is an example of a gauge theory, where gauge transformations correspond to changes in the space-time coordinate system. To determine physical quantities, one is free to introduce gauge conditions (i.e. to work with specific space-time coordinates), and such conditions are often used to simplify technical aspects of the calculation or to facilitate the interpretation
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Inflation with the Chern-Simons term in the Palatini formulation J. Cosmol. Astropart. Phys. (IF 5.3) Pub Date : 2025-01-21 Ali Hassan and Syksy Räsänen
We consider the Chern-Simons term coupled to the inflaton in the Palatini formulation of general relativity. In contrast to the metric formulation, here the Chern-Simons term affects also the background evolution. We approximately solve for the connection, insert it back into the action, and reduce the order of the equations to obtain an effective theory in the gradient approximation. We consider three
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A model for the redshift-space galaxy 4-point correlation function J. Cosmol. Astropart. Phys. (IF 5.3) Pub Date : 2025-01-21 William Ortolá Leonard, Zachary Slepian and Jiamin Hou
The field of cosmology is entering an epoch of unparalleled wealth of observational data thanks to galaxy surveys such as DESI, Euclid, and Roman. Therefore, it is essential to have a firm theoretical basis that allows the effective analysis of the data. With this purpose, we compute the nonlinear, gravitationally-induced connected galaxy 4-point correlation function (4PCF) at the tree level in Standard
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Universal gravitational wave signatures of cosmological solitons J. Cosmol. Astropart. Phys. (IF 5.3) Pub Date : 2025-01-21 Kaloian D. Lozanov, Misao Sasaki and Volodymyr Takhistov
Cosmological solitonic objects such as monopoles, cosmic strings, domain walls, oscillons and Q-balls often appear in theories of the early Universe. We demonstrate that such scenarios are generically accompanied by a novel production source of gravitational waves stemming from soliton isocurvature perturbations. The resulting induced universal gravitational waves (UGWs) reside at lower frequencies
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Hybrid summary statistics: neural weak lensing inference beyond the power spectrum J. Cosmol. Astropart. Phys. (IF 5.3) Pub Date : 2025-01-21 T. Lucas Makinen, Alan Heavens, Natalia Porqueres, Tom Charnock, Axel Lapel and Benjamin D. Wandelt
Cosmological inference relies on compressed forms of the raw data for analysis, with traditional methods exploiting physics knowledge to define summary statistics, such as power spectra, that are known to capture much of the information. An alternative approach is to ask a neural network to find a set of informative summary statistics from data, which can then be analysed either by likelihood- or simulation-based