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  • Resummed kinetic field theory: a model of coupled baryonic and dark matter
    J. Cosmol. Astropart. Phys. (IF 5.21) Pub Date : 2021-01-22
    Daniel Geiss, Ivan Kostyuk, Robert Lilow and Matthias Bartelmann

    We present a new analytical description of cosmic structure formation in a mixture of dark and baryonic matter, using the framework of Kinetic Field Theory (KFT)—a statistical field theory for classical particle dynamics. So far, KFT has only been able to describe a single type of particles, sufficient to consider structure growth due to the gravitational interactions between dark matter. However,

    更新日期:2021-01-22
  • Identifying dark matter haloes by the caustic boundary
    J. Cosmol. Astropart. Phys. (IF 5.21) Pub Date : 2021-01-22
    Sergei F. Shandarin

    The dark matter density is formally infinite at the location of caustic surfaces, where dark matter sheet folds in phase space. The caustics are boundaries between the regions with different number of streams n str ( x ) in Eulerian space. Alternatively they can be defined as boundaries between the regions with different number of flip-flops n ff ( q ) in Lagrangian space. The number of flip-flops

    更新日期:2021-01-22
  • Scalar-tensor cosmologies without screening
    J. Cosmol. Astropart. Phys. (IF 5.21) Pub Date : 2021-01-22
    Johannes Noller, Luca Santoni, Enrico Trincherini and Leonardo G. Trombetta

    Scalar-tensor theories are frequently only consistent with fifth force constraints in the presence of a screening mechanism, namely in order to suppress an otherwise unacceptably large coupling between the scalar and ordinary matter. Here we investigate precisely which subsets of Horndeski theories do not give rise to and/or require such a screening mechanism. We investigate these subsets in detail

    更新日期:2021-01-22
  • EFT approach of inelastic dark matter for Xenon electron recoil detection
    J. Cosmol. Astropart. Phys. (IF 5.21) Pub Date : 2021-01-21
    Hong-Jian He, Yu-Chen Wang and Jiaming Zheng

    Measuring dark matter (DM) signals via electron recoil provides an important means for direct detection of light DM particles. The recent XENON1T anomaly with electron recoil energy around E R = (2–3) keV can be naturally explained by DM inelastic scattering which injects energy to the recoiled electrons and gives a narrow peak structure in the recoil spectrum. We present an effective field theory

    更新日期:2021-01-22
  • An upper limit on the initial temperature of the radiation-dominated Universe
    J. Cosmol. Astropart. Phys. (IF 5.21) Pub Date : 2021-01-21
    Betty X. Hu and Abraham Loeb

    Gravitational waves (GWs) are produced by colliding particles through the gravitational analogue of electromagnetic bremsstrahlung. We calculate the contribution of free-free emission in the radiation-dominated Universe to the stochastic GW background. We find that the energy density of the resulting GW radiation is heavily dependent on the number of elementary particles, N tot , and the maximum initial

    更新日期:2021-01-22
  • The neutrino magnetic moment portal: cosmology, astrophysics, and direct detection
    J. Cosmol. Astropart. Phys. (IF 5.21) Pub Date : 2021-01-21
    Vedran Brdar, Admir Greljo, Joachim Kopp and Toby Opferkuch

    We revisit the physics of neutrino magnetic moments, focusing in particular on the case where the right-handed, or sterile, neutrinos are heavier (up to several MeV) than the left-handed Standard Model neutrinos. The discussion is centered around the idea of detecting an upscattering event mediated by a transition magnetic moment in a neutrino or dark matter experiment. Considering neutrinos from all

    更新日期:2021-01-22
  • From dwarf galaxies to galaxy clusters: Self-Interacting Dark Matter over 7 orders of magnitude in halo mass
    J. Cosmol. Astropart. Phys. (IF 5.21) Pub Date : 2021-01-21
    Kyrylo Bondarenko, Anastasia Sokolenko, Alexey Boyarsky, Andrew Robertson, David Harvey and Yves Revaz

    In this paper we study the density profiles of self-interacting dark matter (SIDM) haloes spanning the full observable mass range, from dwarf galaxies to galaxy clusters. Using realistic simulations that model the baryonic physics relevant for galaxy formation, we compare the density profiles of haloes simulated with either SIDM or cold and collisionless dark matter (CDM) to those inferred from observations

    更新日期:2021-01-22
  • The importance of priors on LIGO-Virgo parameter estimation: the case of primordial black holes
    J. Cosmol. Astropart. Phys. (IF 5.21) Pub Date : 2021-01-21
    S. Bhagwat, V. De Luca, G. Franciolini, P. Pani and A. Riotto

    The black holes detected by current and future interferometers can have diverse origins. Their expected mass and spin distributions depend on the specifics of the formation mechanisms. When a physically motivated prior distribution is used in a Bayesian inference, the parameters estimated from the gravitational-wave data can change significantly, potentially affecting the physical interpretation of

    更新日期:2021-01-21
  • Looking for the possible gluon condensation signature in sub-TeV gamma-ray spectra: from active galactic nuclei to gamma ray bursts
    J. Cosmol. Astropart. Phys. (IF 5.21) Pub Date : 2021-01-21
    Wei Zhu, Zechun Zheng, Peng Liu, Lihong Wan, Jianhong Ruan and Fan Wang

    The gluon condensation in the proton as a dynamical model is used to treat a series of unsolved puzzles in sub-TeV gamma ray spectra, they include the broken power-law of blazar's radiation, the hardening confusion of 1ES 1426+428, Mkn 501, and the recently recorded sub-TeV gamma spectra of GRB 180720B and GRB 190114C . We find that the above anomalous phenomena in gamma ray energy spectra can be understood

    更新日期:2021-01-21
  • Primordial black holes as dark matter and gravitational waves from bumpy axion inflation
    J. Cosmol. Astropart. Phys. (IF 5.21) Pub Date : 2021-01-21
    Ogan Özsoy and Zygmunt Lalak

    We consider a mechanism for producing a significant population of primordial black holes (PBHs) and an observable stochastic gravitational wave background (SGWB) within string theory inspired models of inflation. In this framework where inflaton is identified as a non-compact axion-like field, sub-leading non-perturbative effects can superimpose steep cliffs connected by smooth plateaus onto the underlying

    更新日期:2021-01-21
  • Electroweak phase transition confronted with dark matter detection constraints
    J. Cosmol. Astropart. Phys. (IF 5.21) Pub Date : 2021-01-20
    Cheng-Wei Chiang, Da Huang and Bo-Qiang Lu

    We study the type-II first-order electroweak phase transition and dark matter (DM) phenomenology in both real and complex singlet extensions of SM . In the real singlet extension with a ##IMG## [https://ej.iop.org/icons/Entities/BbbZ.gif] {Bbb Z} 2 symmetry, we show that the parameter regions favored by the phase transition suffer from strong constraints from DM direct detection so that only a negligible

    更新日期:2021-01-21
  • Primordial black holes in Higgs- R 2 inflation as the whole of dark matter
    J. Cosmol. Astropart. Phys. (IF 5.21) Pub Date : 2021-01-20
    Dhong Yeon Cheong, Sung Mook Lee and Seong Chan Park

    Primordial black holes are produced in a minimal UV extension to the Higgs inflation with an included R 2 term. We show that for parameters consistent with Standard Model measurements and Planck observation results lead to M PBH ##IMG## [https://ej.iop.org/icons/Entities/in.gif] {in} (10 −16 , 10 −15) M ⊙ primordial black holes with significant abundance, which may consist the majority of dark matter

    更新日期:2021-01-21
  • Analyzing clustering of astrophysical gravitational-wave sources: luminosity-distance space distortions
    J. Cosmol. Astropart. Phys. (IF 5.21) Pub Date : 2021-01-20
    Toshiya Namikawa

    We present a formulation of observed number density fluctuations of gravitational-wave (GW) sources in a three dimensional space. In GW observations, redshift identification for each GW source is a challenging issue, in particular, for high redshift sources. The use of observed luminosity distance as a distance indicator will be a simple yet optimal way for measuring the clustering signal. We derive

    更新日期:2021-01-21
  • Unifying dark matter, dark energy and inflation with a fuzzy dark fluid
    J. Cosmol. Astropart. Phys. (IF 5.21) Pub Date : 2021-01-20
    A. Arbey and J.-F. Coupechoux

    Scalar fields appear in many cosmological models, in particular in order to provide explanations for dark energy and inflation, but also to emulate dark matter. In this paper, we show that it is possible for a scalar field to replace simultaneously dark matter, dark energy and inflation by assuming the existence of a non-minimal coupling to gravity, a Mexican hat potential, and a spontaneous symmetry

    更新日期:2021-01-21
  • Interplay between neutrino and gravity portals for FIMP dark matter
    J. Cosmol. Astropart. Phys. (IF 5.21) Pub Date : 2021-01-20
    Marco Chianese, Bowen Fu and Stephen F. King

    In the classic type I seesaw mechanism with very heavy right-handed (RH) neutrinos, it is possible to account for dark matter via RH neutrino portal couplings to a feebly interacting massive particle (FIMP) dark sector. However, for large RH neutrino masses, gravity can play an important role. We study the interplay between the neutrino portal through the right-handed neutrinos and the gravity portal

    更新日期:2021-01-21
  • Analytical thresholds for black hole formation in general cosmological backgrounds
    J. Cosmol. Astropart. Phys. (IF 5.21) Pub Date : 2021-01-18
    Albert Escrivà, Cristiano Germani and Ravi K. Sheth

    We consider black holes which form from an initially spherically symmetric super-Hubble perturbation of a cosmological background filled by a perfect fluid p = w ρ with w ##IMG## [https://ej.iop.org/icons/Entities/in.gif] {in} (0,1]. Previous work has shown that when w = 1/3 (radiation), there is a critical threshold for black hole formation (δ c ), which, to a very good approximation, only depends

    更新日期:2021-01-19
  • The Atacama Cosmology Telescope: delensed power spectra and parameters
    J. Cosmol. Astropart. Phys. (IF 5.21) Pub Date : 2021-01-18
    Dongwon Han, Neelima Sehgal, Amanda MacInnis, Alexander van Engelen, Blake D. Sherwin, Mathew S. Madhavacheril, Simone Aiola, Nicholas Battaglia, James A. Beall, Daniel T. Becker, Erminia Calabrese, Steve K. Choi, Omar Darwish, Edward V. Denison, Mark J. Devlin, Jo Dunkley, Simone Ferraro, Anna E. Fox, Matthew Hasselfield, J. Colin Hill, Gene C. Hilton, Matt Hilton, Renée Hložek, Johannes Hubmayr

    We present ΛCDM cosmological parameter constraints obtained from delensed microwave background power spectra. Lensing maps from a subset of DR4 data from the Atacama Cosmology Telescope (ACT) are used to undo the lensing effect in ACT spectra observed at 150 and 98 GHz. At 150 GHz, we remove the lensing distortion with an effective efficiency of ( TT ), ( EE ), ( TE ) and ( BB ); this results in detections

    更新日期:2021-01-19
  • Pixel domain multi-resolution minimum variance in-painting of CMB maps
    J. Cosmol. Astropart. Phys. (IF 5.21) Pub Date : 2021-01-15
    Hao Liu

    This work introduces an unbiased minimum variance in-painting of the pixel domain CMB maps for both the missing and available sky regions. In the missing region, it generates CMB realizations that have identical statistical properties to the expected CMB signal; and in the available region, it significantly alleviate the unwanted residuals, e.g., the residual of EB-leakage. The time cost of this method

    更新日期:2021-01-19
  • The distribution of vacua in random landscape potentials
    J. Cosmol. Astropart. Phys. (IF 5.21) Pub Date : 2021-01-15
    Low Lerh Feng, Shaun Hotchkiss and Richard Easther

    Landscape cosmology posits the existence of a convoluted, multidimensional, scalar potential—the "landscape"—with vast numbers of metastable minima. Random matrices and random functions in many dimensions provide toy models of the landscape, allowing the exploration of conceptual issues associated with these scenarios. We compute the relative number and slopes of minima as a function of the vacuum

    更新日期:2021-01-19
  • Cosmological forecast for non-Gaussian statistics in large-scale weak lensing surveys
    J. Cosmol. Astropart. Phys. (IF 5.21) Pub Date : 2021-01-15
    Dominik Zürcher, Janis Fluri, Raphael Sgier, Tomasz Kacprzak and Alexandre Refregier

    Cosmic shear data contains a large amount of cosmological information encapsulated in the non-Gaussian features of the weak lensing mass maps. Weak lensing studies mostly rely on two-point statistics to constrain cosmology from cosmic shear data, that do not capture all of this information. Additional non-Gaussian information can be extracted using non-Gaussian statistics. We compare the constraining

    更新日期:2021-01-19
  • Exciting the domain wall soliton
    J. Cosmol. Astropart. Phys. (IF 5.21) Pub Date : 2021-01-15
    Jose J. Blanco-Pillado, Daniel Jiménez-Aguilar and Jon Urrestilla

    Many solitonic configurations in field theory have localized bound states in their spectrum of linear perturbations. This opens up the possibility of having long lived excitations of these solitons that could affect their dynamics. We start the study of these effects in the simplest configuration of a domain wall kink solution in theλ ##IMG## [https://ej.iop.org/icons/Entities/phi.gif] {phi} 4 theory

    更新日期:2021-01-19
  • Velocity-dependent self-interacting dark matter from groups and clusters of galaxies
    J. Cosmol. Astropart. Phys. (IF 5.21) Pub Date : 2021-01-14
    Laura Sagunski, Sophia Gad-Nasr, Brian Colquhoun, Andrew Robertson and Sean Tulin

    We probe the self-interactions of dark matter with relaxed galaxy groups and clusters using observational data from strong and weak lensing and stellar kinematics. Our analysis uses the Jeans formalism and considers a wider range of systematic effects than in previous work, including adiabatic contraction and stellar anisotropy, to robustly constrain the self-interaction cross section. For both groups

    更新日期:2021-01-19
  • Three problems of superfluid dark matter and their solution
    J. Cosmol. Astropart. Phys. (IF 5.21) Pub Date : 2021-01-14
    Tobias Mistele

    In superfluid dark matter (SFDM), the phonon field plays a double role: it carries the superfluid's energy density and it mediates the MOND-like phonon force. We show that these two roles are in tension with each other on galactic scales: a MOND-like phonon force is in tension with a superfluid in equilibrium and with a significant superfluid energy density. To avoid these tensions, we propose a model

    更新日期:2021-01-19
  • Curvature bounce in general relativity: background and primordial spectrum
    J. Cosmol. Astropart. Phys. (IF 5.21) Pub Date : 2021-01-13
    Cyril Renevey, Aurélien Barrau, Killian Martineau and Selim Touati

    Recent data suggest that the Universe could be positively curved. Combined with an inflationary stage, this might lead to a curvature bounce instead of the Big Bang. The background evolution is presented, as a function of the parameters controlling the cosmic evolution. The primordial tensor spectrum is also calculated and possible observational footprints of the model are underlined. Several potentials

    更新日期:2021-01-13
  • The Fisher gAlaxy suRvey cOde (FARO)
    J. Cosmol. Astropart. Phys. (IF 5.21) Pub Date : 2021-01-13
    Miguel Aparicio Resco and Antonio L. Maroto

    The Fisher gAlaxy suRvey cOde (FARO) is a new public Python code that computes the Fisher matrix for galaxy surveys observables. The observables considered are the linear multitracer 3D galaxy power spectrum, the linear convergence power spectrum for weak lensing, and the linear multitracer power spectrum for the correlation between galaxy distribution and convergence. The code allows for tomographic

    更新日期:2021-01-13
  • Hawking radiation particle spectrum of a Kerr-Newman black hole
    J. Cosmol. Astropart. Phys. (IF 5.21) Pub Date : 2021-01-13
    Joshua Foo and Michael R.R. Good

    Charged, rotating Kerr-Newman black holes represent the most general class of asymptotically flat black hole solutions to the Einstein-Maxwell equations of general relativity. Here, we consider a simplified model for the Hawking radiation produced by a Kerr-Newman black hole by utilizing a (1+1)-dimensional accelerated boundary correspondence (i.e. a flat spacetime mirror trajectory) in Minkowski spacetime

    更新日期:2021-01-13
  • Building a boostless bootstrap for the bispectrum
    J. Cosmol. Astropart. Phys. (IF 5.21) Pub Date : 2021-01-13
    Enrico Pajer

    The observation of primordial correlators by cosmological surveys is a very promising avenue to probe high energies and the perturbative regime of quantum gravity. Hence, it is imperative that we understand how these observables are shaped by the pillars of fundamental physics, namely unitarity, locality and symmetries. To this end, we study the three-point correlators of gravitons and scalar curvature

    更新日期:2021-01-13
  • Loop corrections to the power spectrum for massive neutrino cosmologies with full time- and scale-dependence
    J. Cosmol. Astropart. Phys. (IF 5.21) Pub Date : 2021-01-13
    Mathias Garny and Petter Taule

    Loop corrections to the power spectrum are frequently computed using approximate non-linear kernels adopted from an Einstein de-Sitter (EdS) cosmology. We present an algorithm that allows us to take the full time- and scale-dependence of the underlying fluid dynamics into account, and apply it to assess the impact of neutrino free-streaming on the 1- and 2-loop matter power spectrum. Neutrino perturbations

    更新日期:2021-01-13
  • Stochastic baryogenesis
    J. Cosmol. Astropart. Phys. (IF 5.21) Pub Date : 2021-01-13
    Yi-Peng Wu and Kalliopi Petraki

    Using a multi-field stochastic approach, we investigate the vacuum expectation value (VEV) during inflation of a scalar field charged under a mildly broken global U(1) symmetry that can play the role of baryon or lepton number, or possibly a dark baryon number or a combination of the three. Even for a CP invariant Lagrangian, the stochastic distribution of inflationary VEVs in general breaks CP spontaneously

    更新日期:2021-01-13
  • Multi-dimensional solution of fast neutrino conversions in binary neutron star merger remnants
    J. Cosmol. Astropart. Phys. (IF 5.21) Pub Date : 2021-01-12
    Ian Padilla-Gay, Shashank Shalgar and Irene Tamborra

    Fast pairwise conversions of neutrinos are predicted to be ubiquitous in neutron star merger remnants with potentially major implications on the nucleosynthesis of the elements heavier than iron. We present the first sophisticated numerical solution of the neutrino flavor evolution above the remnant disk within a (2+1+1) dimensional setup: two spatial coordinates, one angular variable, and time. We

    更新日期:2021-01-12
  • A fast particle-mesh simulation of non-linear cosmological structure formation with massive neutrinos
    J. Cosmol. Astropart. Phys. (IF 5.21) Pub Date : 2021-01-12
    Adrian E. Bayer, Arka Banerjee and Yu Feng

    Quasi-N-body simulations, such as FastPM, provide a fast way to simulate cosmological structure formation, but have yet to adequately include the effects of massive neutrinos. We present a method to include neutrino particles in FastPM, enabling computation of the CDM and total matter power spectra to percent-level accuracy in the non-linear regime. The CDM-neutrino cross-power can also be computed

    更新日期:2021-01-12
  • Matter trispectrum: theoretical modelling and comparison to N-body simulations
    J. Cosmol. Astropart. Phys. (IF 5.21) Pub Date : 2021-01-11
    Davide Gualdi, Sergi Novell, Héctor Gil-Marín and Licia Verde

    The power spectrum has long been the workhorse summary statistics for large-scale structure cosmological analyses. However, gravitational non-linear evolution moves precious cosmological information from the two-point statistics (such as the power spectrum) to higher-order correlations. Moreover, information about the primordial non-Gaussian signal lies also in higher-order correlations. Without tapping

    更新日期:2021-01-12
  • First constraints on small-scale non-Gaussianity from UV galaxy luminosity functions
    J. Cosmol. Astropart. Phys. (IF 5.21) Pub Date : 2021-01-08
    Nashwan Sabti, Julian B. Muñoz and Diego Blas

    UV luminosity functions provide a wealth of information on the physics of galaxy formation in the early Universe. Given that this probe indirectly tracks the evolution of the mass function of dark matter halos, it has the potential to constrain alternative theories of structure formation. One of such scenarios is the existence of primordial non-Gaussianity at scales beyond those probed by observations

    更新日期:2021-01-12
  • Dispelling a myth on dense neutrino media: fast pairwise conversions depend on energy
    J. Cosmol. Astropart. Phys. (IF 5.21) Pub Date : 2021-01-08
    Shashank Shalgar and Irene Tamborra

    Pairwise conversions of neutrinos have complicated the challenging goal of quantifying the relevance of neutrino microphysics in compact astrophysical objects, limiting the ability to perform numerical simulations and encouraging the employment of semi-analytical tools, such as the linear stability analysis. Given the high neutrino density, the dependence of pairwise conversions on the neutrino energy

    更新日期:2021-01-12
  • Relativistic corrections to the growth of structure in modified gravity
    J. Cosmol. Astropart. Phys. (IF 5.21) Pub Date : 2021-01-08
    Guilherme Brando, Kazuya Koyama and David Wands

    We present a method to introduce relativistic corrections including linear dark energy perturbations in Horndeski theory into Newtonian simulations based on the N-body gauge approach. We assume that standard matter species (cold dark matter, baryons, photons and neutrinos) are only gravitationally-coupled with the scalar field and we then use the fact that one can include modified gravity effects as

    更新日期:2021-01-12
  • Measuring the spectrum of primordial gravitational waves with CMB, PTA and laser interferometers
    J. Cosmol. Astropart. Phys. (IF 5.21) Pub Date : 2021-01-08
    Paolo Campeti, Eiichiro Komatsu, Davide Poletti and Carlo Baccigalupi

    We investigate the possibility of measuring the primordial gravitational wave (GW) signal across 21 decades in frequencies, using the cosmic microwave background (CMB), pulsar timing arrays (PTA), and laser and atomic interferometers. For the CMB and PTA experiments we consider the LiteBIRD mission and the Square Kilometer Array (SKA), respectively. For the interferometers we consider space mission

    更新日期:2021-01-12
  • Vortices and waves in light dark matter
    J. Cosmol. Astropart. Phys. (IF 5.21) Pub Date : 2021-01-08
    Lam Hui, Austin Joyce, Michael J. Landry and Xinyu Li

    In a galactic halo like the Milky Way, bosonic dark matter particles lighter than about 100 eV have a de Broglie wavelength larger than the average inter-particle separation and are therefore well described as a set of classical waves. This applies to, for instance, the QCD axion as well as to lighter axion-like particles such as fuzzy dark matter. We show that the interference of waves inside a halo

    更新日期:2021-01-12
  • Impacts of dark matter on the curvature of the neutron star
    J. Cosmol. Astropart. Phys. (IF 5.21) Pub Date : 2021-01-05
    H.C. Das, Ankit Kumar, Bharat Kumar, S.K. Biswal and S.K. Patra

    The effects of dark matter (DM) on the curvatures of the neutron star (NS) are examined by using the stiff and soft relativistic mean-field equation of states. The curvatures of the NSs are calculated with the variation of baryon density. It is found that the radial variation of different curvatures significantly affected by DM inside the star. The surface curvature is found to be more remarkable for

    更新日期:2021-01-06
  • The effects of massive neutrinos on the linear point of the correlation function
    J. Cosmol. Astropart. Phys. (IF 5.21) Pub Date : 2021-01-05
    G. Parimbelli, S. Anselmi, M. Viel, C. Carbone, F. Villaescusa-Navarro, P.S. Corasaniti, Y. Rasera, R. Sheth, G.D. Starkman and I. Zehavi

    The linear point (LP), defined as the mid-point between the dip and the peak of the two-point clustering correlation function (TPCF), has been shown to be an excellent standard ruler for cosmology. In fact, it is nearly redshift-independent, being weakly sensitive to non-linearities, scale-dependent halo bias and redshift-space distortions. So far, these findings were tested assuming that neutrinos

    更新日期:2021-01-06
  • Instability of compact stars with a nonminimal scalar-derivative coupling
    J. Cosmol. Astropart. Phys. (IF 5.21) Pub Date : 2021-01-05
    Ryotaro Kase and Shinji Tsujikawa

    For a theory in which a scalar field ##IMG## [https://ej.iop.org/icons/Entities/phi.gif] {phi} has a nonminimal derivative coupling to the Einstein tensor G μ ν of the form ##IMG## [https://ej.iop.org/icons/Entities/phi.gif] {phi} G μ ν ∇ μ ∇ ν ##IMG## [https://ej.iop.org/icons/Entities/phi.gif] {phi} , it is known that there exists a branch of static and spherically-symmetric relativistic stars endowed

    更新日期:2021-01-06
  • Revised estimates of CMB B -mode polarization induced by patchy reionization
    J. Cosmol. Astropart. Phys. (IF 5.21) Pub Date : 2021-01-04
    Anirban Roy, Girish Kulkarni, P. Daniel Meerburg, Anthony Challinor, Carlo Baccigalupi, Andrea Lapi and Martin G. Haehnelt

    The search for primordial gravitational waves through the B -mode polarization pattern in the CMB is one of the major goals of current and future CMB experiments. Besides foregrounds, a potential hurdle in this search is the anisotropic secondary B -mode polarization generated by the scattering of CMB photons off free electrons produced during patchy cosmological reionization. Robust predictions of

    更新日期:2021-01-06
  • Phase transitions in an expanding universe: stochastic gravitational waves in standard and non-standard histories
    J. Cosmol. Astropart. Phys. (IF 5.21) Pub Date : 2021-01-04
    Huai-Ke Guo, Kuver Sinha, Daniel Vagie and Graham White

    We undertake a careful analysis of stochastic gravitational wave production from cosmological phase transitions in an expanding universe, studying both a standard radiation as well as a matter dominated history. We analyze in detail the dynamics of the phase transition, including the false vacuum fraction, bubble lifetime distribution, bubble number density, mean bubble separation, etc., for an expanding

    更新日期:2021-01-06
  • Isocurvature modes: joint analysis of the CMB power spectrum and bispectrum
    J. Cosmol. Astropart. Phys. (IF 5.21) Pub Date : 2021-01-04
    T. Montandon, G. Patanchon and B. van Tent

    We perform a joint analysis of the power spectrum and the bispectrum of the CMB temperature and polarization anisotropies to improve the constraints on isocurvature modes. We construct joint likelihoods, both for the existing Planck data, and to make forecasts for the future LiteBIRD and CMB-S4 experiments. We assume a general two-field inflation model with five free parameters, leading to one isocurvature

    更新日期:2021-01-06
  • Speeding up the detectability of the harmonic-space galaxy bispectrum
    J. Cosmol. Astropart. Phys. (IF 5.21) Pub Date : 2021-01-04
    Francesco Montanari and Stefano Camera

    We present a method that allows us for the first time to estimate the signal-to-noise ratio (SNR) of the harmonic-space galaxy bispectrum induced by gravity, a complementary probe to already well established Fourier-space clustering analyses. We show how to do it considering only ~1000 triangle configurations in multipole space, corresponding to a computational speedup of a factor ##IMG## [https://ej

    更新日期:2021-01-06
  • Information geometry in cosmological inference problems
    J. Cosmol. Astropart. Phys. (IF 5.21) Pub Date : 2021-01-04
    Eileen Giesel, Robert Reischke, Björn Malte Schäfer and Dominic Chia

    Statistical inference often involves models which are non-linear in the parameters and which therefore typically exhibit non-Gaussian posterior distributions. These non-Gaussianities can be prominent especially when data is limited or not constraining enough. Many computational and analytical tools exist that can deal with non-Gaussian distributions, and empirical Gaussianisation transforms can be

    更新日期:2021-01-06
  • Limits on w CDM from the EFTofLSS with the PyBird code
    J. Cosmol. Astropart. Phys. (IF 5.21) Pub Date : 2021-01-04
    Guido D'Amico, Leonardo Senatore and Pierre Zhang

    We apply the Effective Field Theory of Large-Scale Structure to analyze the w CDM cosmological model. By using the full shape of the power spectrum and the BAO post-reconstruction measurements from BOSS, the Supernovae from Pantheon, and a prior from BBN, we set the competitive CMB-independent limit w =−1.046 −0.052 +0.055 at 68% C.L. After adding the Planck CMB data, we find w =−1.023 −0.030 +0.033

    更新日期:2021-01-06
  • The effects on CMB power spectra and bispectra from the polarization rotation and its correlations with temperature and E-polarization
    J. Cosmol. Astropart. Phys. (IF 5.21) Pub Date : 2020-12-31
    Hua Zhai, Si-Yu Li, Mingzhe Li, Hong Li and Xinmin Zhang.

    The Chern-Simons term, through which the cosmic Axion-like field couples to the electromagnetic field, has the effect to rotate CMB polarization directions and to break the CPT symmetry. This rotation will change the CMB power spectra, no matter isotropic or anisotropic the rotation angle is. In this paper we revisit this issue by further considering the correlations between the anisotropic rotation

    更新日期:2021-01-02
  • The Atacama Cosmology Telescope: a measurement of the Cosmic Microwave Background power spectra at 98 and 150 GHz
    J. Cosmol. Astropart. Phys. (IF 5.21) Pub Date : 2020-12-30
    Steve K. Choi, Matthew Hasselfield, Shuay-Pwu Patty Ho, Brian Koopman, Marius Lungu, Maximilian H. Abitbol, Graeme E. Addison, Peter A. R. Ade, Simone Aiola, David Alonso, Mandana Amiri, Stefania Amodeo, Elio Angile, Jason E. Austermann, Taylor Baildon, Nick Battaglia, James A. Beall, Rachel Bean, Daniel T. Becker, J Richard Bond, Sarah Marie Bruno, Erminia Calabrese, Victoria Calafut, Luis E. Campusano

    We present the temperature and polarization angular power spectra of the CMB measured by the Atacama Cosmology Telescope (ACT) from 5400 deg 2 of the 2013–2016 survey, which covers >15000 deg 2 at 98 and 150 GHz. For this analysis we adopt a blinding strategy to help avoid confirmation bias and, related to this, show numerous checks for systematic error done before unblinding. Using the likelihood

    更新日期:2021-01-02
  • The phase of the BAO on observable scales
    J. Cosmol. Astropart. Phys. (IF 5.21) Pub Date : 2020-12-30
    Daniel Green and Alexander K. Ridgway

    The baryon acoustic oscillations (BAO) provide an important bridge between the early universe and the expansion history at late times. While the BAO has primarily been used as a standard ruler, it also encodes recombination era physics, as demonstrated by a recent measurement of the neutrino-induced phase shift in the BAO feature. In principle, these measurements offer a novel window into physics at

    更新日期:2021-01-02
  • Probing dark photons in the early universe with big bang nucleosynthesis
    J. Cosmol. Astropart. Phys. (IF 5.21) Pub Date : 2020-12-30
    Jung-Tsung Li, George M. Fuller and Evan Grohs

    We perform calculations of dark photon production and decay in the early universe for ranges of dark photon masses and vacuum coupling with standard model photons. Simultaneously and self-consistently with dark photon production and decay, our calculations include a complete treatment of weak decoupling and big bang nucleosynthesis (BBN) physics. These calculations incorporate all relevant weak, electromagnetic

    更新日期:2021-01-02
  • Big-bang nucleosynthesis with sub-GeV massive decaying particles
    J. Cosmol. Astropart. Phys. (IF 5.21) Pub Date : 2020-12-30
    Masahiro Kawasaki, Kazunori Kohri, Takeo Moroi, Kai Murai and Hitoshi Murayama

    We consider the effects of the injections of energetic photon and electron (or positron) on the big-bang nucleosynthesis. We study the photodissociation of light elements in the early Universe paying particular attention to the case that the injection energy is sub-GeV and derive upper bounds on the primordial abundances of the massive decaying particle as a function of its lifetime. We also discuss

    更新日期:2021-01-02
  • The Atacama Cosmology Telescope: DR4 maps and cosmological parameters
    J. Cosmol. Astropart. Phys. (IF 5.21) Pub Date : 2020-12-30
    Simone Aiola, Erminia Calabrese, Loïc Maurin, Sigurd Naess, Benjamin L. Schmitt, Maximilian H. Abitbol, Graeme E. Addison, Peter A. R. Ade, David Alonso, Mandana Amiri, Stefania Amodeo, Elio Angile, Jason E. Austermann, Taylor Baildon, Nick Battaglia, James A. Beall, Rachel Bean, Daniel T. Becker, J Richard Bond, Sarah Marie Bruno, Victoria Calafut, Luis E. Campusano, Felipe Carrero, Grace E. Chesmore

    We present new arcminute-resolution maps of the Cosmic Microwave Background temperature and polarization anisotropy from the Atacama Cosmology Telescope, using data taken from 2013–2016 at 98 and 150 GHz. The maps cover more than 17,000 deg 2 , the deepest 600 deg 2 with noise levels below 10μK-arcmin. We use the power spectrum derived from almost 6,000 deg 2 of these maps to constrain cosmology. The

    更新日期:2021-01-02
  • The Atacama Cosmology Telescope: arcminute-resolution maps of 18 000 square degrees of the microwave sky from ACT 2008–2018 data combined with Planck
    J. Cosmol. Astropart. Phys. (IF 5.21) Pub Date : 2020-12-30
    Sigurd Naess, Simone Aiola, Jason E. Austermann, Nick Battaglia, James A. Beall, Daniel T. Becker, Richard J. Bond, Erminia Calabrese, Steve K. Choi, Nicholas F. Cothard, Kevin T. Crowley, Omar Darwish, Rahul Datta, Edward V. Denison, Mark Devlin, Cody J. Duell, Shannon M. Duff, Adriaan J. Duivenvoorden, Jo Dunkley, Rolando Dünner, Anna E. Fox, Patricio A. Gallardo, Mark Halpern, Dongwon Han, Matthew

    This paper presents a maximum-likelihood algorithm for combining sky maps with disparate sky coverage, angular resolution and spatially varying anisotropic noise into a single map of the sky. We use this to merge hundreds of individual maps covering the 2008–2018 ACT observing seasons, resulting in by far the deepest ACT maps released so far. We also combine the maps with the full Planck maps, resulting

    更新日期:2021-01-02
  • The well-tempered cosmological constant: the Horndeski variations
    J. Cosmol. Astropart. Phys. (IF 5.21) Pub Date : 2020-12-29
    Stephen Appleby and Eric V. Linder

    Well tempering is one of the few classical field theory methods for solving the original cosmological constant problem, dynamically canceling a large (possibly Planck scale) vacuum energy and leaving the matter component intact, while providing a viable cosmology with late time cosmic acceleration and an end de Sitter state. We present the general constraints that variations of Horndeski gravity models

    更新日期:2021-01-02
  • Window function dependence of the novel mass function of primordial black holes
    J. Cosmol. Astropart. Phys. (IF 5.21) Pub Date : 2020-12-29
    Koki Tokeshi, Keisuke Inomata and Jun'ichi Yokoyama

    The mass function of primordial black holes (PBHs) has been discussed by many authors so far and, recently, the novel formulation of the PBH mass function has been proposed to avoid uncertainty of the mass in the conventional mass function. However, the novel formulation still has the ambiguity originating from the choice of the window function. In this paper, we discuss the window function dependence

    更新日期:2021-01-02
  • The well-tempered cosmological constant: fugue in B ##IMG## [https://ej.iop.org/icons/Entities/flat.gif] {flat}
    J. Cosmol. Astropart. Phys. (IF 5.21) Pub Date : 2020-12-29
    Stephen Appleby and Eric V. Linder

    Zero point fluctuations of quantum fields should generate a large cosmological constant energy density in any spacetime. How then can we have anything other than de Sitter space without fine tuning? Well tempering—dynamical cancellation of the cosmological constant using degeneracy within the field equations— can replace a large cosmological constant with a much lower energy state. Here we give an

    更新日期:2021-01-02
  • Erratum: Sourced scalar fluctuations in bouncing cosmology
    J. Cosmol. Astropart. Phys. (IF 5.21) Pub Date : 2020-12-22
    Ido Ben-Dayan and Judy Kupferman

    In "Sourced scalar fluctuations in bouncing cosmology" JCAP07(2019)050 [https://doi.org/10.1088/1475-7516/2019/07/050] we calculated the scalar and tensor power spectra generated by sourced fluctuations due to coupling between the scalar field, which holds most of the energy density of the universe, and a gauge field for a general FLRW metric. The coupling between the scalar field ##IMG## [https://ej

    更新日期:2020-12-22
  • Comparing the galactic bulge and galactic disk millisecond pulsars
    J. Cosmol. Astropart. Phys. (IF 5.21) Pub Date : 2020-12-21
    Harrison Ploeg, Chris Gordon, Roland Crocker and Oscar Macias

    The Galactic Center Excess (GCE) is an extended gamma-ray source in the central region of the Galaxy found in Fermi Large Area Telescope (Fermi-LAT) data. One of the leading explanations for the GCE is an unresolved population of millisecond pulsars (MSPs) in the Galactic bulge. Due to differing star formation histories it is expected that the MSPs in the Galactic bulge are older and therefore dimmer

    更新日期:2020-12-22
  • Energy injection in pre-recombination era and EDGES detection
    J. Cosmol. Astropart. Phys. (IF 5.21) Pub Date : 2020-12-21
    Nirmalya Brahma, Shiv Sethi and Shivnag Sista

    We study the possibility of explaining the recent EDGES detection by an energy injection in the pre-recombination era. Our aim is to show that the residue of this energy injection could give the resultant increase in the energy density at frequencies x e ≡ h ν/( kT) ##IMG## [https://ej.iop.org/icons/Entities/simeq.gif] {simeq} 10 −3 , which is needed to explain the EDGES result. We consider two models

    更新日期:2020-12-22
  • Right-handed neutrino dark matter, neutrino masses, and non-standard cosmology in a 2HDM
    J. Cosmol. Astropart. Phys. (IF 5.21) Pub Date : 2020-12-17
    G. Arcadi, S. Profumo, F.S. Queiroz and C. Siqueira

    We explore the dark matter phenomenology of a weak-scale right-handed neutrino in the context of a Two Higgs Doublet Model. The expected signal at direct detection experiments is different from the usual spin-independent and spin-dependent classification since the scattering with quarks depends on the dark matter spin. The dark matter relic density is set by thermal freeze-out and in the presence of

    更新日期:2020-12-22
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