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Probing the Dark Matter density with gravitational waves from super-massive binary black holes J. Cosmol. Astropart. Phys. (IF 6.4) Pub Date : 2024-02-28 Anish Ghoshal, Alessandro Strumia
Supermassive black hole binaries source gravitational waves measured by Pulsar Timing Arrays. The frequency spectrum of this stochastic background is predicted more precisely than its amplitude. We argue that Dark Matter friction can suppress the spectrum around nHz frequencies, where it is measured, allowing to derive robust and significant bounds on the Dark Matter density, which, in turn, controls
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Minimal Inert Doublet benchmark for dark matter and the baryon asymmetry J. Cosmol. Astropart. Phys. (IF 6.4) Pub Date : 2024-02-28 María Dias Astros, Sven Fabian, Florian Goertz
In this article we discuss a minimal extension of the Inert Doublet Model (IDM) with an effective CP-violating D=6 operator, involving the inert Higgs and weak gauge bosons, that can lift it to a fully realistic setup for creating the baryon asymmetry of the Universe (BAU). Avoiding the need to stick to an explicit completion, we investigate the potential of such an operator to give rise to the measured
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Dark matter vorticity and velocity dispersion from truncated Dyson-Schwinger equations J. Cosmol. Astropart. Phys. (IF 6.4) Pub Date : 2024-02-28 Alaric Erschfeld, Stefan Floerchinger
Large-scale structure formation is studied in a kinetic theory approach, extending the standard perfect pressureless fluid description for dark matter by including the velocity dispersion tensor as a dynamical degree of freedom. The evolution of power spectra for density, velocity and velocity dispersion degrees of freedom is investigated in a non-perturbative approximation scheme based on the Dyson-Schwinger
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ULDM self-interactions, tidal effects and tunnelling out of satellite galaxies J. Cosmol. Astropart. Phys. (IF 6.4) Pub Date : 2024-02-26 Bihag Dave, Gaurav Goswami
It is well-known that Dark Matter (DM) inside a satellite galaxy orbiting a host halo experiences a tidal potential. If DM is ultra-light, given its wave-like nature, one expects it to tunnel out of the satellite — if this happens sufficiently quickly, then the satellite will not survive over cosmological timescales, severely constraining this dark matter model. In this paper, we study the effects
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Searching for dark matter annihilation with IceCube and P-ONE J. Cosmol. Astropart. Phys. (IF 6.4) Pub Date : 2024-02-26 K. Desai, R. Li, S. Meighen-Berger
We present a new search for weakly interacting massive particles utilizing ten years of public IceCube data, setting more stringent bounds than previous IceCube analysis on massive dark matter to neutrino annihilation. We also predict the future potential of the new neutrino observatory, P-ONE, showing that it may even exceed the sensitivities of Fermi-LAT gamma-ray searches by about 1–2 orders of
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Taming assembly bias for primordial non-Gaussianity J. Cosmol. Astropart. Phys. (IF 6.4) Pub Date : 2024-02-26 Emanuele Fondi, Licia Verde, Francisco Villaescusa-Navarro, Marco Baldi, William R. Coulton, Gabriel Jung, Dionysios Karagiannis, Michele Liguori, Andrea Ravenni, Benjamin D. Wandelt
Primordial non-Gaussianity of the local type induces a strong scale-dependent bias on the clustering of halos in the late-time Universe. This signature is particularly promising to provide constraints on the non-Gaussianity parameter f NL from galaxy surveys, as the bias amplitude grows with scale and becomes important on large, linear scales. However, there is a well-known degeneracy between the real
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Low scale leptogenesis in singlet-triplet scotogenic model J. Cosmol. Astropart. Phys. (IF 6.4) Pub Date : 2024-02-26 Labh Singh, Devabrat Mahanta, Surender Verma
The scotogenic model presents an elegant and succinct framework for elucidating the origin of tiny neutrino masses within the framework of the Standard Model, employing radiative corrections within the domain of the dark sector. We investigate the possibility of achieving low-scale leptogenesis in the singlet-triplet scotogenic model (STSM), where dark matter mediates neutrino mass generation. We initially
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Early dark energy constraints with late-time expansion marginalization J. Cosmol. Astropart. Phys. (IF 6.4) Pub Date : 2024-02-26 João Rebouças, Jonathan Gordon, Diogo H.F. de Souza, Kunhao Zhong, Vivian Miranda, Rogerio Rosenfeld, Tim Eifler, Elisabeth Krause
Early dark energy (EDE) is an extension to the ΛCDM model that includes an additional energy density contribution near recombination. The model was proposed to reduce the tension between the measurements of the Hubble constant H 0 from the cosmic microwave background (CMB) and from the local cosmic distance ladder. Some analyses in the recent literature have shown intriguing hints for EDE. However
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The skewness of the distance-redshift relation in ΛCDM J. Cosmol. Astropart. Phys. (IF 6.4) Pub Date : 2024-02-26 T. Schiavone, E. Di Dio, G. Fanizza
Starting from a recently proposed framework for the evaluation of the cosmological averages, we evaluate the higher-order moments for the distribution of a given observable. Then, we explicitly discuss the case of the Hubble-Lemaître diagram and evaluate its skewness at the leading order in the cosmological perturbative expansion of the gravitational potential. In particular, we focus on perturbations
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An AstroSat/UVIT study of galaxies in the cluster Abell 2199 J. Cosmol. Astropart. Phys. (IF 6.4) Pub Date : 2024-02-26 Smriti Mahajan, Kulinder Pal Singh, Somak Raychaudhury
We present the newly acquired data for an AstroSat/UVIT field centred on a face-on spiral starburst galaxy UGC 10420, located in the X-ray bright cluster Abell 2199 (z = 0.031). We have analysed the FUV BaF2 data for this field along with the archival FUV and NUV data from the GALEX mission, optical photometric data from the SDSS, spectroscopic data from the literature, and low-frequency radio data
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Primordial black holes in non-canonical scalar field inflation driven by quartic potential in the presence of bump J. Cosmol. Astropart. Phys. (IF 6.4) Pub Date : 2024-02-26 Soma Heydari, Kayoomars Karami
Here, generation of Primordial Black Holes (PBHs) from quartic potential in the presence of a tiny bump in non-canonical inflationary model has been inquired. It is demonstrated that, a viable inflationary era can be driven through the quartic potential in non-canonical framework with a power-law Lagrangian density. Furthermore, setting a suitable function of inflaton field as a correction term (like
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Teukolsky-like equations in a non-vacuum axisymmetric type D spacetime J. Cosmol. Astropart. Phys. (IF 6.4) Pub Date : 2024-02-26 Ya Guo, Hiroaki Nakajima, Wenbin Lin
We study an axisymmetric metric satisfying the Petrov type D property with some additional ansatze, but without assuming the vacuum condition. We find that our metric in turn becomes conformal to the Kerr metric deformed by one function of the radial coordinate. We then study the gravitational-wave equations on this background metric in the case that the conformal factor is unity. We find that under
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Self-consistent interaction of linear gravitational and electromagnetic waves in non-magnetized plasma J. Cosmol. Astropart. Phys. (IF 6.4) Pub Date : 2024-02-26 Deepen Garg, I.Y. Dodin
This paper explores the hybridization of linear metric perturbations with linear electromagnetic (EM) perturbations in non-magnetized plasma for a general background metric. The local wave properties are derived from first principles for inhomogeneous plasma, without assuming any symmetries of the background metric. First, we derive the effective (“oscillation-center”) Hamiltonian that governs the
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Radio-optical synergies at high redshift to constrain primordial non-Gaussianity J. Cosmol. Astropart. Phys. (IF 6.4) Pub Date : 2024-02-26 Matilde Barberi Squarotti, Stefano Camera, Roy Maartens
We apply the multi-tracer technique to test the possibility of improved constraints on the amplitude of local primordial non-Gaussianity, f NL, in the cosmic large-scale structure. A precise measurement of f NL is difficult because the effects of non-Gaussianity mostly arise on the largest scales, which are heavily affected by the low statistical sampling commonly referred to as cosmic variance. The
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Quintessence in the Weyl-Gauss-Bonnet model J. Cosmol. Astropart. Phys. (IF 6.4) Pub Date : 2024-02-23 José Jaime Terente Díaz, Konstantinos Dimopoulos, Mindaugas Karčiauskas, Antonio Racioppi
Quintessence models have been widely examined in the context of scalar-Gauss-Bonnet gravity, a subclass of Horndeski's theory, and were proposed as viable candidates for Dark Energy. However, the relatively recent observational constraints on the speed of gravitational waves c GW have resulted in many of those models being ruled out because they predict c GW ≠ c generally. While these were formulated
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Primordial gravitational waves in non-minimally coupled chromo-natural inflation J. Cosmol. Astropart. Phys. (IF 6.4) Pub Date : 2024-02-23 Ema Dimastrogiovanni, Matteo Fasiello, Martino Michelotti, Lucas Pinol
We consider inflation driven by an axion-like particle coupled to an SU(2) gauge sector via a Chern-Simons term. Known as chromo-natural inflation, this scenario is in tension with CMB observations. In order to remedy this fact and preserve both the symmetries and the intriguing gravitational wave phenomenology exhibited by the model, we explore the non-minimal coupling of the axion-inflaton to the
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Testing the nature of gravitational wave propagation using dark sirens and galaxy catalogues J. Cosmol. Astropart. Phys. (IF 6.4) Pub Date : 2024-02-22 Anson Chen, Rachel Gray, Tessa Baker
The dark sirens method enables us to use gravitational wave events without electromagnetic counterparts as tools for cosmology and tests of gravity. Furthermore, the dark sirens analysis code gwcosmo can now robustly account for information coming from both galaxy catalogues and the compact object mass distribution. We present here an extension of the gwcosmo code and methodology to constrain parameterized
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Overall signature of the metric and the cosmological constant J. Cosmol. Astropart. Phys. (IF 6.4) Pub Date : 2024-02-22 Bruno Alexandre, Steffen Gielen, João Magueijo
We consider a little known aspect of signature change, where the overall sign of the metric is allowed to change, with physical implications. We show how, in different formulations of general relativity, this type of classical signature change across boundaries with a degenerate metric can be made consistent with a change in sign (and value) of the cosmological constant Λ. In particular, the separate
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Shedding light on neutrino self-interactions with solar antineutrino searches J. Cosmol. Astropart. Phys. (IF 6.4) Pub Date : 2024-02-22 Quan-feng Wu, Xun-Jie Xu
Solar antineutrinos are absent in the standard solar model prediction. Consequently, solar antineutrino searches emerge as a powerful tool to probe new physics capable of converting neutrinos into antineutrinos. In this study, we highlight that neutrino self-interactions, recently gaining considerable attention due to their cosmological and astrophysical implications, can lead to significant solar
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Perturbing fast neutrino flavor conversion J. Cosmol. Astropart. Phys. (IF 6.4) Pub Date : 2024-02-22 Marie Cornelius, Shashank Shalgar, Irene Tamborra
The flavor evolution of neutrinos in dense astrophysical sources, such as core-collapse supernovae or compact binary mergers, is non-linear due to the coherent forward scattering of neutrinos among themselves. Recent work in this context has been addressed to figure out whether flavor equipartition could be a generic flavor outcome of fast flavor conversion. We investigate the flavor conversion physics
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Primordial black holes dark matter and secondary gravitational waves from warm Higgs-G inflation J. Cosmol. Astropart. Phys. (IF 6.4) Pub Date : 2024-02-22 Richa Arya, Rajeev Kumar Jain, Arvind Kumar Mishra
We explore the role of dissipative effects during warm inflation leading to the small-scale enhancement of the power spectrum of curvature perturbations. In this paper, we specifically focus on non-canonical warm inflationary scenarios and study a model of warm Higgs-G inflation, in which the Standard Model Higgs boson drives inflation, with a Galileon-like non-linear kinetic term. We show that in
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A new analytical model of magnetofluids surrounding rotating black holes J. Cosmol. Astropart. Phys. (IF 6.4) Pub Date : 2024-02-21 Yehui Hou, Zhenyu Zhang, Minyong Guo, Bin Chen
In this study, we develop a simplified magnetofluid model in the framework of GRMHD. We consider an ideal, adiabatic fluid composed of two components, ions and electrons, having a constant ratio between their temperatures. The flows are assumed to be governed by gravity, enabling us to employ the ballistic approximation, treating the streamlines as timelike geodesics. We show that the model is analytically
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Inflation in symmergent metric-Palatini gravity J. Cosmol. Astropart. Phys. (IF 6.4) Pub Date : 2024-02-21 Nilay Bostan, Canan Karahan, Ozan Sargın
In this paper, we study the cosmological inflation phenomenon in symmergent gravity theory. Symmergent gravity is a novel framework which merges gravity and the standard model (SM) so that the gravity emerges from the matter loops and restores the broken gauge symmetries along the way. Symmergent gravity is capable of inducing the gravitational constant G and the quadratic curvature coefficient cO
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Improving constraints on primordial non-Gaussianity using neural network based reconstruction J. Cosmol. Astropart. Phys. (IF 6.4) Pub Date : 2024-02-21 Thomas Flöss, P. Daniel Meerburg
We study the use of U-Nets in reconstructing the linear dark matter density field and its consequences for constraining cosmological parameters, in particular primordial non-Gaussianity. Our network is able to reconstruct the initial conditions of redshift z = 0 density fields from N-body simulations with 90% accuracy out to k ≤ 0.4 h/Mpc, competitive with state-of-the-art reconstruction algorithms
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Simultaneous detection of boosted dark matter and neutrinos from the semi-annihilation at DUNE J. Cosmol. Astropart. Phys. (IF 6.4) Pub Date : 2024-02-21 Mayumi Aoki, Takashi Toma
Dark matter direct detection experiments impose the strong bounds on thermal dark matter scenarios. The bound can naturally be evaded if the cross section is momentum transfer or velocity dependent. One can test such thermal dark matter scenarios if dark matter particles are boosted by some mechanism. In this work, we consider a specific semi-annihilation χχ̅→νχ where χ(χ̅) is dark matter (anti-dark
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A parametric model for self-interacting dark matter halos J. Cosmol. Astropart. Phys. (IF 6.4) Pub Date : 2024-02-21 Daneng Yang, Ethan O. Nadler, Hai-Bo Yu, Yi-Ming Zhong
We propose a parametric model for studying self-interacting dark matter (SIDM) halos. The model uses an analytical density profile, calibrated using a controlled N-body SIDM simulation that covers the entire gravothermal evolution, including core-forming and -collapsing phases. By normalizing the calibrated density profile, we obtain a universal description for SIDM halos at any evolution phase. The
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OSIRIS-REx constraints on local dark matter and cosmic neutrino profiles J. Cosmol. Astropart. Phys. (IF 6.4) Pub Date : 2024-02-21 Yu-Dai Tsai, Joshua Eby, Jason Arakawa, Davide Farnocchia, Marianna S. Safronova
We derive purely gravitational constraints on dark matter and cosmic neutrino profiles in the solar system using asteroid (101955) Bennu. We focus on Bennu because of its extensive tracking data and high-fidelity trajectory modeling resulting from the OSIRIS-REx mission. We find that the local density of dark matter is bound by ρ DM ≲ 3.3 × 10-15 kg/m3 ≃ 6 × 106 ρ̅DM, in the vicinity of ∼ 1.1 au (where
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The clustering of dark sirens' invisible host galaxies J. Cosmol. Astropart. Phys. (IF 6.4) Pub Date : 2024-02-21 Charles Dalang, Tessa Baker
Dark sirens are a powerful way to infer cosmological and astrophysical parameters from the combination of gravitational wave sirens and galaxy catalogues. Importantly, the method relies on the completeness of the galaxy catalogues being well modelled. A magnitude-limited catalogue will always be incomplete to some extent, requiring a completion scheme to avoid biasing the parameter inference. Standard
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Spectrum of gravitational waves from long-lasting primordial sources J. Cosmol. Astropart. Phys. (IF 6.4) Pub Date : 2024-02-21 Sabir Ramazanov
We discuss long-lasting gravitational wave sources arising and operating during radiation-dominated stage. Under a set of assumptions, we establish the correspondence between cosmological evolution of a source and the resulting gravitational wave spectrum. Namely, for the source energy density ρs falling as a power law characterized by the exponent β, i.e., ρs ∝ 1/aβ , where a is the Universe scale
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Stationary rotating and axially symmetric dust systems as peculiar General Relativistic objects J. Cosmol. Astropart. Phys. (IF 6.4) Pub Date : 2024-02-21 Matteo Luca Ruggiero
We study an exact solution of Einstein's equations describing a self-gravitating system, made of dust, distributed with axial symmetry and in stationary rotation, and we prove that this type of system has no Newtonian analogue. In a low-energy limit, its existence depends on the solution of a Grad-Shafranov equation in vacuum which can be interpreted as a Laplace equation for the toroidal component
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Spectators no more! How even unimportant fields can ruin your Primordial Black Hole model J. Cosmol. Astropart. Phys. (IF 6.4) Pub Date : 2024-02-21 A. Wilkins, A. Cable
In this work we terminate inflation during a phase of Constant Roll by means of a waterfall field coupled to the inflaton and a spectator field. The presence of a spectator field means that inflation does not end at a single point, ϕ e, but instead has some uncertainty resulting in a stochastic end of inflation. We find that even modestly coupled spectator fields can drastically increase the abundance
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Number count of gravitational waves and supernovae in luminosity distance space for ΛCDM and scalar-tensor theories J. Cosmol. Astropart. Phys. (IF 6.4) Pub Date : 2024-02-14 Anna Balaudo, Mattia Pantiri, Alessandra Silvestri
The clustering of gravitational waves in luminosity distance space is emerging as a promising probe of the growth of structure. Just like for galaxies, its observation is subject to a number of relativistic corrections that affect the measured signal and need to be accounted for when fitting theoretical models to the data. We derive the full expression for the number count of gravitational waves in
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Constraints on the proton fraction of cosmic rays at the highest energies and the consequences for cosmogenic neutrinos and photons J. Cosmol. Astropart. Phys. (IF 6.4) Pub Date : 2024-02-14 Domenik Ehlert, Arjen van Vliet, Foteini Oikonomou, Walter Winter
Over the last decade, observations have shown that the mean mass of ultra-high-energy cosmic rays (UHECRs) increases progressively toward the highest energies. However, the precise composition is still unknown and several theoretical studies hint at the existence of a subdominant proton component up to the highest energies. Motivated by the exciting prospect of performing charged-particle astronomy
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Non-thermal WIMPy baryogenesis with primordial black hole J. Cosmol. Astropart. Phys. (IF 6.4) Pub Date : 2024-02-09 Ki-Young Choi, Jongkuk Kim, Erdenebulgan Lkhagvadorj
We consider the possibility that the weakly interacting massive particles produced from the evaporation of primordial black hole can explain both the relic density of dark matter and the baryon asymmetry of the Universe, through their annihilation which violate B and CP-symmetry. We find that the primordial black hole with mass less than 107g is a good candidate as an source of TeV dark matter with
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Primordial Black Holes and loops in single-field inflation J. Cosmol. Astropart. Phys. (IF 6.4) Pub Date : 2024-02-09 Hassan Firouzjahi, Antonio Riotto
Using the δN formalism we calculate the one-loop correction to the large-scale power spectrum of the curvature perturbation in the standard scenario where primordial black holes are formed in the early universe thanks to a phase of ultra-slow-roll in single-field inflation. We explicitly show that one-loop corrections are negligible when the transition from the ultra-slow-roll to the slow-roll phase
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Constraining primordial black hole masses through f(R) gravity scalarons in Big Bang Nucleosynthesis J. Cosmol. Astropart. Phys. (IF 6.4) Pub Date : 2024-02-09 Abhijit Talukdar, Sanjeev Kalita, Nirmali Das, Nandita Lahkar
Big Bang Nucleosynthesis (BBN) is a strong probe for constraining new physics including gravitation. f(R) gravity theory is an interesting alternative to general relativity which introduces additional degrees of freedom known as scalarons. In this work we demonstrate the existence of black hole solutions in f(R) gravity and develop a relation between scalaron mass and black hole mass. We have used
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Model independent dark matter properties from cosmic growth J. Cosmol. Astropart. Phys. (IF 6.4) Pub Date : 2024-02-09 Tilek Zhumabek, Mikhail Denissenya, Eric V. Linder
Dark matter dominates the matter budget of the universe but its nature is unknown. Deviations from the standard model, where dark matter clusters with the same gravitational strength as baryons, and has the same pressureless equation of state as baryons, can be tested by cosmic growth measurements. We take a model independent approach, allowing deviations in bins of redshift, and compute the constraints
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Constraining Palatini gravity with GR-independent equations of state for neutron stars J. Cosmol. Astropart. Phys. (IF 6.4) Pub Date : 2024-02-09 Eva Lope-Oter, Aneta Wojnar
We demonstrate how to construct GR-independent equations of state for a neutron star from the information available in the literature. We emphasize the importance of using theory-based principles instead of relying solely on astrophysical observables and General Relativity. We propose a set of equations of state based on first microscopic principles, including chiral perturbation theory and perturbation
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Galaxy bias in the era of LSST: perturbative bias expansions J. Cosmol. Astropart. Phys. (IF 6.4) Pub Date : 2024-02-09 Andrina Nicola, Boryana Hadzhiyska, Nathan Findlay, Carlos García-García, David Alonso, Anže Slosar, Zhiyuan Guo, Nickolas Kokron, Raúl Angulo, Alejandro Aviles, Jonathan Blazek, Jo Dunkley, Bhuvnesh Jain, Marcos Pellejero, James Sullivan, Christopher W. Walter, Matteo Zennaro, The LSST Dark Energy Science collaboration
Upcoming imaging surveys will allow for high signal-to-noise measurements of galaxy clustering at small scales. In this work, we present the results of the Rubin Observatory Legacy Survey of Space and Time (LSST) bias challenge, the goal of which is to compare the performance of different nonlinear galaxy bias models in the context of LSST Year 10 (Y10) data. Specifically, we compare two perturbative
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On the anisotropies of the cosmological gravitational-wave background from pulsar timing array observations J. Cosmol. Astropart. Phys. (IF 6.4) Pub Date : 2024-02-09 Ran Ding, Chi Tian
Significant evidence for a stochastic gravitational-wave background has recently been reported by several Pulsar Timing Array observations. These studies have shown that, in addition to astrophysical explanations based on supermassive black hole binaries (SMBHBs), cosmological origins are considered equally important sources for these signals. To further explore these cosmological sources, in this
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The correlations between galaxy properties in different environments of the cosmic web J. Cosmol. Astropart. Phys. (IF 6.4) Pub Date : 2024-02-05 Anindita Nandi, Biswajit Pandey, Prakash Sarkar
We study the correlations between (u-r) colour, stellar mass, specific star formation rate (sSFR) and metallicity of galaxies in different geometric environments of the cosmic web using a volume limited sample from the SDSS. The geometric environment at the location of each galaxy is determined using the eigenvalues of the tidal tensor in three dimensions. We use the Pearson correlation coefficient (PCC)
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Vector dark matter production during inflation and reheating J. Cosmol. Astropart. Phys. (IF 6.4) Pub Date : 2024-02-05 Jose A.R. Cembranos, Luis J. Garay, Álvaro Parra-López, Jose M. Sánchez Velázquez
Gravitational particle production of spectator fields due to the expansion universe during the inflationary and reheating phases of the early universe is of particular interest in the context of dark matter, since it allows to constrain the properties of the dark candidate by comparing the density of particles produced with the observed dark matter abundance. In such processes, tachyonic instabilities
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Using machine learning to optimise chameleon fifth force experiments J. Cosmol. Astropart. Phys. (IF 6.4) Pub Date : 2024-02-05 Chad Briddon, Clare Burrage, Adam Moss, Andrius Tamosiunas
The chameleon is a theorised scalar field that couples to matter and possess a screening mechanism, which weakens observational constraints from experiments performed in regions of higher matter density. One consequence of this screening mechanism is that the force induced by the field is dependent on the shape of the source mass (a property that distinguishes it from gravity). Therefore an optimal
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Pulsar Timing Array signature from oscillating metric perturbations due to ultra-light axion J. Cosmol. Astropart. Phys. (IF 6.4) Pub Date : 2024-02-05 Jai-chan Hwang, Donghui Jeong, Hyerim Noh, Clemente Smarra
A coherently oscillating ultra-light axion can behave as dark matter. In particular, its coherently oscillating pressure perturbations can source an oscillating scalar metric perturbation, with a characteristic oscillation frequency which is twice the axion Compton frequency. A candidate in the mass range 10(-24,-21) eV can provide a signal in the frequency range tested by current and future Pulsar
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Probing exotic phases via stochastic gravitational wave spectra J. Cosmol. Astropart. Phys. (IF 6.4) Pub Date : 2024-02-05 Joshua Berger, Amit Bhoonah, Biswajit Padhi
Stochastic backgrounds of gravitational waves (GWs) from the pre-BBN era offer a unique opportunity to probe the universe beyond what has already been achieved with the Cosmic Microwave Background (CMB). If the source is short in duration, the low frequency tail of the resulting GW spectrum follows a universal frequency scaling dependent on the equation of state of the universe when modes enter the
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Scalar fields with derivative coupling to curvature in the Palatini and the metric formulation J. Cosmol. Astropart. Phys. (IF 6.4) Pub Date : 2024-02-05 Hamed Bouzari Nezhad, Syksy Räsänen
We study models where a scalar field has derivative and non-derivative couplings to the Ricci tensor and the co-Ricci tensor with a view to inflation. We consider both the metric formulation and the Palatini formulation. In the Palatini case, the couplings to the Ricci tensor and the Ricci scalar give the same result regardless of whether the connection is unconstrained or the non-metricity or the
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Defying eternal inflation in warm inflation with a negative running J. Cosmol. Astropart. Phys. (IF 6.4) Pub Date : 2024-02-02 Gabriele Montefalcone, Rudnei O. Ramos, Gustavo S. Vicente, Katherine Freese
It was pointed out previously [1] that a sufficiently negative running of the spectral index of curvature perturbations from (ordinary i.e. cold) inflation is able to prevent eternal inflation from ever occurring. Here, we reevaluate those original results, but in the context of warm inflation, in which a substantial radiation component (produced by the inflaton) exists throughout the inflationary
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Prospects for realtime characterization of core-collapse supernova and neutrino properties J. Cosmol. Astropart. Phys. (IF 6.4) Pub Date : 2024-02-02 Meriem Bendahman, Isabel Goos, Joao A.B. Coelho, Matteo Bugli, Alexis Coleiro, Sonia El Hedri, Thierry Foglizzo, Davide Franco, Jérôme Guilet, Antoine Kouchner, Raphaël Raynaud, Yahya Tayalati
Core-collapse supernovae (CCSNe) offer extremely valuable insights into the dynamics of galaxies. Neutrino time profiles from CCSNe, in particular, could reveal unique details about collapsing stars and particle behavior in dense environments. However, CCSNe in our galaxy and the Large Magellanic Cloud are rare and only one supernova neutrino observation has been made so far. To maximize the information
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On the importance of heavy fields in pseudo-scalar inflation J. Cosmol. Astropart. Phys. (IF 6.4) Pub Date : 2024-02-02 Chong-Bin Chen, Ziwei Wang, Siyi Zhou
Pseudo-scalar inflation coupled with U(1) gauge fields through the Chern-Simons term has been extensively studied. However, new physics arising from UV theories may still influence the pseudo-scalar field at low-energy scales, potentially impacting predictions of inflation. In the realm of effective field theory (EFT), we investigated axion inflation, where operators from heavy fields are also present
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Dark Matter Direct Detection in 𝗍-channel mediator models J. Cosmol. Astropart. Phys. (IF 6.4) Pub Date : 2024-02-02 Giorgio Arcadi, David Cabo-Almeida, Federico Mescia, Javier Virto
We perform a comprehensive study of the Direct Detection phenomenology of singlet Dark Matter t-channel portal models. For that purpose, we present a complete one-loop matching onto a Heavy Dark-Matter Effective Field Theory, leading to a complete computation of the loop induced Direct Detection cross-section for both scalar and fermionic Dark Matter candidates. The results are compared with current
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Flat-sky angular power spectra revisited J. Cosmol. Astropart. Phys. (IF 6.4) Pub Date : 2024-02-02 Zucheng Gao, Zvonimir Vlah, Anthony Challinor
We revisit the flat-sky approximation for evaluating the angular power spectra of projected random fields by retaining information about the correlations along the line of sight. For the case of projections with broad, overlapping radial window functions, these line-of-sight correlations are suppressed and are ignored in the commonly adopted Limber approximation. However, retaining the correlations
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The effect of multiple cooling channels on the formation of dark compact objects J. Cosmol. Astropart. Phys. (IF 6.4) Pub Date : 2024-02-02 Joseph Bramante, Melissa Diamond, J. Leo Kim
A dissipative dark sector can result in the formation of compact objects with masses comparable to stars and planets. In this work, we investigate the formation of such compact objects from a subdominant inelastic dark matter model, and study the resulting distributions of these objects. In particular, we consider cooling from dark Bremsstrahlung and a rapid decay process that occurs after inelastic
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NAJADS: a self-contained framework for the direct determination of astrophysical J-factors J. Cosmol. Astropart. Phys. (IF 6.4) Pub Date : 2024-02-02 Anna Balaudo, Francesca Calore, Valentina De Romeri, Fiorenza Donato
Cosmological simulations play a pivotal role in understanding the properties of the dark matter (DM) distribution in both galactic and galaxy-cluster environments. The characterization of DM structures is crucial for informing indirect DM searches, aiming at the detection of the annihilation (or decay) products of DM particles. A fundamental quantity in these analyses is the astrophysical J-factor
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Gravitational Waves and gravitino mass in No-Scale Supergravity inflation with Polonyi term J. Cosmol. Astropart. Phys. (IF 6.4) Pub Date : 2024-02-02 Miguel Crispim Romão, Stephen F. King
We study a No-Scale supergravity inflation model which has a non-minimal deformation of the Kähler potential and a Wess-Zumino superpotential extended by the inclusion of a Polonyi mass term. The non-minimal structure of the Kähler potential is responsible for an inflexion point that can lead to the production of gravitational waves at late stages of inflation, while the Polonyi term breaks supersymmetry
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An effective description of Laniakea: impact on cosmology and the local determination of the Hubble constant J. Cosmol. Astropart. Phys. (IF 6.4) Pub Date : 2024-01-31 Leonardo Giani, Cullan Howlett, Khaled Said, Tamara Davis, Sunny Vagnozzi
We propose an effective model to describe the bias induced on cosmological observables by Laniakea, the gravitational supercluster hosting the Milky Way, which was defined using peculiar velocity data from Cosmicflows-4 (CF4). The structure is well described by an ellipsoidal shape exhibiting triaxial expansion, reasonably approximated by a constant expansion rate along the principal axes. Our best
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Pulsar kicks in ultralight dark matter background induced by neutrino oscillation J. Cosmol. Astropart. Phys. (IF 6.4) Pub Date : 2024-01-31 Gaetano Lambiase, Tanmay Kumar Poddar
The interaction of neutrinos with ultralight scalar and vector dark matter backgrounds induce a modification of the neutrino dispersion relation. The effects of this modification are reviewed in the framework of asymmetric emission of neutrinos from the supernova core, and, in turn, of pulsar kicks. We consider the neutrino oscillations, focusing in particular to active-sterile conversion. The ultralight
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Phenomenology of DSR-relativistic in-vacuo dispersion in FLRW spacetime J. Cosmol. Astropart. Phys. (IF 6.4) Pub Date : 2024-01-31 G. Amelino-Camelia, D. Frattulillo, G. Gubitosi, G. Rosati, S. Bedić
Studies of in-vacuo dispersion are the most active area of quantum-gravity phenomenology. The way in which in-vacuo dispersion produces redshift-dependent corrections to the time of flight of astrophysics particles depends on the model-dependent interplay between Planck-scale effects and spacetime curvature/expansion, and we here derive the most general formula for the leading order redshift-dependent
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Source of black bounces in Rastall gravity J. Cosmol. Astropart. Phys. (IF 6.4) Pub Date : 2024-01-31 K. Atazadeh, H. Hadi
In this study, we explore the black bounce solution in Rastall gravity and its potential source field, which can be described as a black hole or wormhole solution depending on certain parameters. We focus on the Bardeen-Type black bounce and Simpson-Visser solution and aim to identify an appropriate source field for these solutions. Our findings suggest that in Rastall gravity, a source for the black
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Numerical modeling of time dependent Diffusive Shock Acceleration J. Cosmol. Astropart. Phys. (IF 6.4) Pub Date : 2024-01-31 S. Aerdker, L. Merten, J. Becker Tjus, D. Walter, F. Effenberger, H. Fichtner
Motivated by cosmic ray (CR) re-acceleration at a potential Galactic Wind Termination Shock (GWTS), we present a numerical model for time-dependent Diffusive Shock Acceleration (DSA). We use the stochastic differential equation solver (DiffusionSDE) of the cosmic ray propagation framework CRPropa3.2 with two modifications: An importance sampling module is introduced to improve statistics at high energies
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Model-independent reconstruction of the primordial curvature power spectrum from PTA data J. Cosmol. Astropart. Phys. (IF 6.4) Pub Date : 2024-01-31 Zhu Yi, Zhi-Qiang You, You Wu
Recently released data from pulsar timing array (PTA) collaborations provide strong evidence for a stochastic signal consistent with a gravitational-wave background, potentially originating from scalar-induced gravitational waves (SIGWs). However, in order to determine whether the SIGWs with a specific power spectrum of curvature perturbations can account for the PTA signal, one needs to estimate the