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  • About detecting very low mass black holes in LAr detectors
    J. Cosmol. Astropart. Phys. (IF 5.21) Pub Date : 2020-10-18
    Ionel Lazanu, Sorina Lazanu and Mihaela Pârvu

    The nature of dark matter is still an open problem. The simplest assumption is that gravity is the only force certainly coupled to dark matter and thus the micro black holes could be a viable candidate. We investigated the possibility of direct detection of charged micro black holes with masses around and upward the Planck scale (10 −5 g), ensuring a classical gravitational treatment of these objects

    更新日期:2020-10-19
  • Exploring galaxies-gravitational waves cross-correlations as an astrophysical probe
    J. Cosmol. Astropart. Phys. (IF 5.21) Pub Date : 2020-10-18
    Giulio Scelfo, Lumen Boco, Andrea Lapi and Matteo Viel

    Gravitational waves astronomy has opened a new opportunity to study the Universe. Full exploitation of this window can especially be provided by combining data coming from gravitational waves experiments with luminous tracers of the Large Scale Structure, like galaxies. In this work we investigate the cross-correlation signal between gravitational waves resolved events, as detected by the Einstein

    更新日期:2020-10-19
  • χ aro ν: a tool for neutrino flux generation from WIMPs
    J. Cosmol. Astropart. Phys. (IF 5.21) Pub Date : 2020-10-15
    Qinrui Liu, Jeffrey Lazar, Carlos A. Argüelles and Ali Kheirandish

    Indirect searches for signatures of corpuscular dark matter have been performed using all cosmic messengers: gamma rays, cosmic rays, and neutrinos. The search for dark matter from neutrinos is of particular importance since they are the only courier that can reach detectors from dark matter processes in dense environments, such as the core of the Sun or Earth, or from the edge of the observable Universe

    更新日期:2020-10-19
  • Limited modified gravity
    J. Cosmol. Astropart. Phys. (IF 5.21) Pub Date : 2020-10-15
    Eric V. Linder

    We systematically assess several limiting cases of modified gravity, where particular theoretical or observational conditions hold. This framework includes the well known scalar-tensor gravity and No Slip Gravity and No Run Gravity, and we extend it to three new limits: only Run, Only Light, and Only Growth Gravities. These limits give simplifications that allow deeper understanding of modified gravity

    更新日期:2020-10-19
  • Scalar-tensor theories of gravity, neutrino physics, and the H 0 tension
    J. Cosmol. Astropart. Phys. (IF 5.21) Pub Date : 2020-10-15
    Mario Ballardini, Matteo Braglia, Fabio Finelli, Daniela Paoletti, Alexei A. Starobinsky and Caterina Umiltà

    We use Planck 2018 data to constrain the simplest models of scalar-tensor theories characterized by a coupling to the Ricci scalar of the type F(σ) R with F(σ) = N pl 2 + ξ σ 2 . We update our results with previous Planck and BAO data releases obtaining the tightest constraints to date on the coupling parameters, that is ξ < 5.5 × 10 −4 for N pl =0 (induced gravity or equivalently extended Jordan-Brans-Dicke)

    更新日期:2020-10-19
  • Cherenkov Telescope Array sensitivity to branon dark matter models
    J. Cosmol. Astropart. Phys. (IF 5.21) Pub Date : 2020-10-15
    A. Aguirre-Santaella, V. Gammaldi, M.A. Sánchez-Conde and D. Nieto

    In the absence of a clear hint of dark matter (DM) signals in the GeV regime so far, heavy, ##IMG## [https://ej.iop.org/icons/Entities/calO.gif] {Script O} (TeV) DM candidates are gradually earning more and more attention within the community. Among others, extra-dimensional brane-world models may produce thermal DM candidates with masses up to 100 TeV . These heavy DM candidates could be detected

    更新日期:2020-10-19
  • Probing alternative cosmologies through the inverse distance ladder
    J. Cosmol. Astropart. Phys. (IF 5.21) Pub Date : 2020-10-14
    Manfred Lindner, Kevin Max, Moritz Platscher and Jonas Rezacek

    We study the implications of a combined analysis of cosmic standard candles and standard rulers on the viability of cosmological models beyond the cosmological concordance model ΛCDM . To this end, we employ well-established data in the form of the joint light-curve analysis supernova compilation, baryon acoustic oscillations, and cosmic microwave background data on the one hand, and a recently proposed

    更新日期:2020-10-16
  • Biased tracers in redshift space in the EFTofLSS with exact time dependence
    J. Cosmol. Astropart. Phys. (IF 5.21) Pub Date : 2020-10-14
    Yaniv Donath and Leonardo Senatore

    We study the effect of the Einstein-de Sitter (EdS) approximation on the one-loop power spectrum of galaxies in redshift space in the Effective Field Theory of Large-Scale Structure. The dark matter density perturbations and velocity divergence are treated with exact time dependence. Splitting the density perturbation into its different temporal evolutions naturally gives rise to an irreducible basis

    更新日期:2020-10-16
  • Swampland, trans-Planckian censorship and fine-tuning problem for inflation: tunnelling wavefunction to the rescue
    J. Cosmol. Astropart. Phys. (IF 5.21) Pub Date : 2020-10-13
    Suddhasattwa Brahma, Robert Brandenberger and Dong-han Yeom

    The trans-Planckian censorship conjecture implies that single-field models of inflation require an extreme fine-tuning of the initial conditions due to the very low-scale of inflation. In this work, we show how a quantum cosmological proposal—namely the tunneling wavefunction—naturally provides the necessary initial conditions without requiring such fine-tunings. More generally, we show how the tunneling

    更新日期:2020-10-15
  • Constraining sterile neutrinos by core-collapse supernovae with multiple detectors
    J. Cosmol. Astropart. Phys. (IF 5.21) Pub Date : 2020-10-13
    Jian Tang, TseChun Wang and Meng-Ru Wu

    The eV-scale sterile neutrino has been proposed to explain some anomalous results in experiments, such as the deficit of reactor neutrino fluxes and the excess of ##IMG## [https://ej.iop.org/icons/Entities/barnu.gif] {bar nu} μ → ##IMG## [https://ej.iop.org/icons/Entities/barnu.gif] {bar nu} e in LSND. This hypothesis can be tested by future core-collapse supernova neutrino detection independently

    更新日期:2020-10-15
  • The impact on distant fly-bys on the rate of binary primordial black hole mergers
    J. Cosmol. Astropart. Phys. (IF 5.21) Pub Date : 2020-10-12
    Sam Young and Adrian S. Hamers

    By performing Monte Carlo simulations of the evolution of binary primordial black hole (PBH) systems, we estimate the effect of distant encounters with single PBHs upon the coalescence time and merger rate of binary PBHs. We find that, for models where PBHs compose a large fraction of dark matter, f PBH ~ 1, the expected fractional change in coalescence time is negligible, of order 10 −6 for most binaries

    更新日期:2020-10-13
  • Constraints on electron-scattering interpretation of XENON1T excess
    J. Cosmol. Astropart. Phys. (IF 5.21) Pub Date : 2020-10-12
    So Chigusa, Motoi Endo and Kazunori Kohri

    Recently, the XENON1T experiment has observed an excess in the electronic recoil data in the recoil energy range of 1–7 keV. One of the most favored new physics interpretations is electron scattering with a boosted particle with a velocity of ~ 0.1 and a mass of ##IMG## [https://ej.iop.org/icons/Entities/gtrsim.gif] {gtrsim} 0.1 MeV. If such a particle has a strong interaction with electrons, it may

    更新日期:2020-10-13
  • Detecting circular polarisation in the stochastic gravitational-wave background from a first-order cosmological phase transition
    J. Cosmol. Astropart. Phys. (IF 5.21) Pub Date : 2020-10-11
    John Ellis, Malcolm Fairbairn, Marek Lewicki, Ville Vaskonen and Alastair Wickens

    We discuss the observability of circular polarisation of the stochastic gravitational-wave background (SGWB) generated by helical turbulence following a first-order cosmological phase transition, using a model that incorporates the effects of both direct and inverse energy cascades. We explore the strength of the gravitational-wave signal and the dependence of its polarisation on the helicity fraction

    更新日期:2020-10-12
  • A Lagrangian perturbation theory in the presence of massive neutrinos
    J. Cosmol. Astropart. Phys. (IF 5.21) Pub Date : 2020-10-11
    Alejandro Aviles and Arka Banerjee

    We develop a Lagrangian Perturbation Theory (LPT) framework to study the clustering of cold dark matter (CDM) in cosmologies with massive neutrinos. We follow the trajectories of CDM particles with Lagrangian displacements fields up to third order in perturbation theory. Once the neutrinos become non-relativistic, their density fluctuations are modeled as being proportional to the CDM density fluctuations

    更新日期:2020-10-12
  • The Halo Void (Dust) Model of large scale structure
    J. Cosmol. Astropart. Phys. (IF 5.21) Pub Date : 2020-10-11
    Rodrigo Voivodic, Henrique Rubira and Marcos Lima

    Within the Halo Model of large scale structure, all matter is contained in dark matter halos. This simple yet powerful framework has been broadly applied to multiple data sets and enriched our comprehension of how matter is distributed in the Universe. In this work we extend this assumption by allowing for matter to rest not only inside halos but also within cosmic voids and in between halos and voids

    更新日期:2020-10-12
  • Predicting the dark matter velocity distribution in galactic structures: tests against hydrodynamic cosmological simulations
    J. Cosmol. Astropart. Phys. (IF 5.21) Pub Date : 2020-10-08
    Thomas Lacroix, Arturo Núñez-Castiñeyra, Martin Stref, Julien Lavalle and Emmanuel Nezri

    Reducing theoretical uncertainties in Galactic dark matter (DM) searches is an important challenge as several experiments are now delving into the parameter space relevant to popular (particle or not) candidates. Since many DM signal predictions rely on the knowledge of the DM velocity distribution—direct searches, capture by stars, p -wave-suppressed or Sommerfeld-enhanced annihilation rate, microlensing

    更新日期:2020-10-12
  • Density matrix calculation of the dark matter abundance in the Higgs induced right-handed neutrino mixing model
    J. Cosmol. Astropart. Phys. (IF 5.21) Pub Date : 2020-10-08
    P. Di Bari, K. Farrag, R. Samanta and Y.L. Zhou

    We present new results on the calculation of the dark matter relic abundance within the Higgs induced right-handed neutrino mixing model, solving the associated density matrix equation. For a benchmark value of the dark matter mass M DM = 220 TeV, we show the evolution of the abundance and how this depends on reheat temperature, dark matter lifetime and source right-handed neutrino mass M S , with

    更新日期:2020-10-12
  • Ultralight scalar decay and the Hubble tension
    J. Cosmol. Astropart. Phys. (IF 5.21) Pub Date : 2020-10-08
    Mark Gonzalez, Mark P. Hertzberg and Fabrizio Rompineve

    We examine whether the Hubble tension, the mismatch between early and late measurements of H 0 , can be alleviated by ultralight scalar fields in the early universe, and we assess its plausibility within UV physics. Since their energy density needs to rapidly redshift away, we explore decays to massless fields around the era of matter-radiation equality. We highlight a concrete implementation of ultralight

    更新日期:2020-10-12
  • Renormalization in gravitational leptogenesis with pseudo-scalar-tensor coupling
    J. Cosmol. Astropart. Phys. (IF 5.21) Pub Date : 2020-10-08
    Kohei Kamada, Jun'ya Kume and Yusuke Yamada

    We consider the renormalization in the pseudo-scalar inflation models with the gravitational Chern-Simons term. In this model, lepton asymmetry is generated from the chiral gravitational waves produced due to the Chern-Simons term through the gravitational chiral anomaly. However, it is known that the naive estimate of the expectation value of the gravitational Chern-Pontryagin density as well as the

    更新日期:2020-10-12
  • Dark matter capture in celestial objects: light mediators, self-interactions, and complementarity with direct detection
    J. Cosmol. Astropart. Phys. (IF 5.21) Pub Date : 2020-10-07
    Basudeb Dasgupta, Aritra Gupta and Anupam Ray

    We generalize the formalism for DM capture in celestial bodies to account for arbitrary mediator mass, and update the existing and projected astrophysical constraints on DM-nucleon scattering cross section from observations of neutron stars. We show that the astrophysical constraints on the DM-nucleon interaction strength, that were thought to be the most stringent, drastically weaken for light mediators

    更新日期:2020-10-12
  • D →4 Einstein-Gauss-Bonnet gravity and beyond
    J. Cosmol. Astropart. Phys. (IF 5.21) Pub Date : 2020-10-07
    Damien A. Easson, Tucker Manton and Andrew Svesko

    A 'novel' pure theory of Einstein-Gauss-Bonnet gravity in four-spacetime dimensions can be constructed by rescaling the Gauss-Bonnet coupling constant, seemingly eluding Lovelock's theorem. Recently, however, the well-posedness of this model has been called into question. Here we apply a `dimensional regularization' technique, first used by Mann and Ross to write down a D →2 limit of general relativity

    更新日期:2020-10-12
  • Solar system tests in modified teleparallel gravity
    J. Cosmol. Astropart. Phys. (IF 5.21) Pub Date : 2020-10-07
    Sebastian Bahamonde, Jackson Levi Said and M. Zubair

    In this paper, we study different Solar System tests in a modified Teleparallel gravity theory based on an arbitrary function f ( T , B ) which depends on the scalar torsion T and the boundary term B . To do this, we first find new perturbed spherically symmetric solutions around Schwarzschild for different power-law forms of the arbitrary Lagrangian. Then, for each model we calculated the photon sphere

    更新日期:2020-10-12
  • Anisotropic Einstein Yang-Mills Higgs dark energy
    J. Cosmol. Astropart. Phys. (IF 5.21) Pub Date : 2020-10-06
    J. Bayron Orjuela-Quintana, Miguel Álvarez, César A. Valenzuela-Toledo and Yeinzon Rodríguez

    In the context of the dark energy scenario, the Einstein Yang-Mills Higgs model in the SO(3) representation was studied for the first time by M. Rinaldi (see [1]) in a homogeneous and isotropic spacetime. We revisit this model, finding in particular that the interaction between the Higgs field and the gauge fields generates contributions to the momentum density, anisotropic stress and pressures, thus

    更新日期:2020-10-07
  • Galactic condensates composed of multiple axion species
    J. Cosmol. Astropart. Phys. (IF 5.21) Pub Date : 2020-10-06
    Joshua Eby, Madelyn Leembruggen, Lauren Street, Peter Suranyi and L.C.R. Wijewardhana

    Ultralight scalar dark matter has been proposed to constitute a component of dark matter, though the minimal scenarios have increasingly become constrained. In this work, we analyze scenarios where the dark matter consists of more than one ultralight boson, each with different masses. This potentially leads to formation of gravitationally-bound Bose-Einstein condensates with structures that are very

    更新日期:2020-10-07
  • Origin of ultra-light fields during inflation and their suppressed non-Gaussianity
    J. Cosmol. Astropart. Phys. (IF 5.21) Pub Date : 2020-10-06
    Ana Achúcarro, Gonzalo A. Palma, Dong-Gang Wang and Yvette Welling

    We study the structure of multi-field inflation models where the primordial curvature perturbation is able to vigorously interact with an ultra-light isocurvature field — a massless fluctuation orthogonal to the background inflationary trajectory in field space. We identify a class of inflationary models where ultra-light fields can emerge as a consequence of an underlying "scaling transformation"

    更新日期:2020-10-07
  • Beware of commonly used approximations. Part I. Errors in forecasts
    J. Cosmol. Astropart. Phys. (IF 5.21) Pub Date : 2020-10-05
    Nicola Bellomo, José Luis Bernal, Giulio Scelfo, Alvise Raccanelli and Licia Verde

    In the era of precision cosmology, establishing the correct magnitude of statistical errors in cosmological parameters is of crucial importance. However, widely used approximations in galaxy surveys analyses can lead to parameter uncertainties that are grossly mis-estimated, even in a regime where the theory is well understood (e.g., linear scales). These approximations can be introduced at three different

    更新日期:2020-10-06
  • Beware of commonly used approximations. Part II. Estimating systematic biases in the best-fit parameters
    J. Cosmol. Astropart. Phys. (IF 5.21) Pub Date : 2020-10-05
    José Luis Bernal, Nicola Bellomo, Alvise Raccanelli and Licia Verde

    Cosmological parameter estimation from forthcoming experiments promise to reach much greater precision than current constraints. As statistical errors shrink, the required control over systematic errors increases. Therefore, models or approximations that were sufficiently accurate so far, may introduce significant systematic biases in the parameter best-fit values and jeopardize the robustness of cosmological

    更新日期:2020-10-06
  • Direct detection of vector dark matter through electromagnetic multipoles
    J. Cosmol. Astropart. Phys. (IF 5.21) Pub Date : 2020-10-05
    Junji Hisano, Alejandro Ibarra and Ryo Nagai

    Dark matter particles, even if they are electrically neutral, could interact with the Standard Model particles via their electromagnetic multipole moments. In this paper, we focus on the electromagnetic properties of the complex vector dark matter candidate, which can be described by means of seven form factors. We calculate the differential scattering cross-section with nuclei due to the interactions

    更新日期:2020-10-06
  • The Websky extragalactic CMB simulations
    J. Cosmol. Astropart. Phys. (IF 5.21) Pub Date : 2020-10-04
    George Stein, Marcelo A. Alvarez, J. Richard Bond, Alexander van Engelen and Nicholas Battaglia

    We present a new pipeline for the efficient generation of synthetic observations of the extragalactic microwave sky, tailored to large ground-based CMB experiments such as the Simons Observatory, Advanced ACTPol, SPT-3G, and CMB-S4. Such simulated observations are a key technical challenge in cosmology because of the dynamic range and accuracy required. The first part of the pipeline generates a random

    更新日期:2020-10-05
  • Supernova neutrino detection in NOvA
    J. Cosmol. Astropart. Phys. (IF 5.21) Pub Date : 2020-10-04
    M.A. Acero, P. Adamson, G. Agam, L. Aliaga, T. Alion, V. Allakhverdian, N. Anfimov, A. Antoshkin, E. Arrieta-Diaz, L. Asquith, A. Aurisano, A. Back, C. Backhouse, M. Baird, N. Balashov, P. Baldi, B.A. Bambah, S. Bashar, K. Bays, S. Bending, R. Bernstein, V. Bhatnagar, B. Bhuyan, J. Bian, J. Blair, A.C. Booth, P. Bour, R. Bowles, C. Bromberg, N. Buchanan, A. Butkevich, V. Bychkov, S. Calvez, T.J. Carroll

    The NOvA long-baseline neutrino experiment uses a pair of large, segmented, liquid-scintillator calorimeters to study neutrino oscillations, using GeV-scale neutrinos from the Fermilab NuMI beam. These detectors are also sensitive to the flux of neutrinos which are emitted during a core-collapse supernova through inverse beta decay interactions on carbon at energies of ##IMG## [https://ej.iop.org/icons/Entities/calO

    更新日期:2020-10-05
  • How to suppress exponential growth—on the parametric resonance of photons in an axion background
    J. Cosmol. Astropart. Phys. (IF 5.21) Pub Date : 2020-10-04
    Ariel Arza, Thomas Schwetz and Elisa Todarello

    Axion-photon interactions can lead to an enhancement of the electromagnetic field by parametric resonance in the presence of a cold axion background, for modes with a frequency close to half the axion mass. In this paper, we study the role of the axion momentum dispersion as well as the effects of a background gravitational potential, which can detune the resonance due to gravitational redshift. We

    更新日期:2020-10-05
  • Primordial black holes in a dimensionally oxidizing Universe
    J. Cosmol. Astropart. Phys. (IF 5.21) Pub Date : 2020-10-01
    Konstantinos F. Dialektopoulos, Piero Nicolini and Athanasios G. Tzikas

    The spontaneous creation of primordial black holes in a violently expanding Universe is a well studied phenomenon. Based on quantum gravity arguments, it has been conjectured that the early Universe might have undergone a lower dimensional phase before relaxing to the current (3+1) dimensional state. In this article we combine the above phenomena: we calculate the pair creation rates of black holes

    更新日期:2020-10-02
  • Horndeski under the quantum loupe
    J. Cosmol. Astropart. Phys. (IF 5.21) Pub Date : 2020-10-01
    Lavinia Heisenberg, Johannes Noller and Jann Zosso

    With recent constraints on the propagation speed of gravitational waves, the class of scalar-tensor theories has significantly been reduced. We consider one of the surviving models still relevant for cosmology and investigate its radiative stability. The model contains operators with explicit breaking of the Galileon symmetry and we study whether they harm the re-organization of the effective field

    更新日期:2020-10-02
  • Local Primordial Non-Gaussianities and super-sample variance
    J. Cosmol. Astropart. Phys. (IF 5.21) Pub Date : 2020-10-01
    Emanuele Castorina and Azadeh Moradinezhad Dizgah

    Fluctuations with wavelengths larger than the volume of a galaxy survey affect the measurement of the galaxy power spectrum within the survey itself. In the presence of local Primordial Non-Gaussianities (PNG), in addition to super-sample matter density and tidal fluctuations, the large-scale gravitational potential also induces a modulation of the observed power spectrum. In this work we investigate

    更新日期:2020-10-02
  • Planck residuals anomaly as a fingerprint of alternative scenarios to inflation
    J. Cosmol. Astropart. Phys. (IF 5.21) Pub Date : 2020-10-01
    Guillem Domènech, Xingang Chen, Marc Kamionkowski and Abraham Loeb

    Planck's residuals of the CMB temperature power spectrum present a curious oscillatory shape that resembles an extra smoothing effect of lensing and is the source of the lensing anomaly. The smoothing effect of lensing to the CMB temperature power spectrum is, to some extent, degenerate with oscillatory modulations of the primordial power spectrum, in particular if the frequency is close to that of

    更新日期:2020-10-02
  • Boosting freeze-in through thermalization
    J. Cosmol. Astropart. Phys. (IF 5.21) Pub Date : 2020-10-01
    Nicolás Bernal

    If the interaction rates between the visible and the dark sectors were never strong enough, the observed dark matter relic abundance could have been produced in the early Universe by non-thermal processes. This is what occurs in the so-called freeze-in mechanism. In the simplest version of the freeze-in paradigm, after dark matter is produced from the standard model thermal bath, its abundance is frozen

    更新日期:2020-10-02
  • The look-elsewhere effect from a unified Bayesian and frequentist perspective
    J. Cosmol. Astropart. Phys. (IF 5.21) Pub Date : 2020-10-01
    Adrian E. Bayer and Uroš Seljak

    When searching over a large parameter space for anomalies such as events, peaks, objects, or particles, there is a large probability that spurious signals with seemingly high significance will be found. This is known as the look-elsewhere effect and is prevalent throughout cosmology, (astro)particle physics, and beyond. To avoid making false claims of detection, one must account for this effect when

    更新日期:2020-10-02
  • Effective photon mass and (dark) photon conversion in the inhomogeneous Universe
    J. Cosmol. Astropart. Phys. (IF 5.21) Pub Date : 2020-10-01
    Andrés Arámburo García, Kyrylo Bondarenko, Sylvia Ploeckinger, Josef Pradler and Anastasia Sokolenko

    Photons traveling cosmological distances through the inhomogeneous Universe experience a great variation in their in-medium induced effective mass. Using the EAGLE suite of hydrodynamical simulations, we infer the free electron distribution and thereby the effective photon mass after reionization. We use this data to study the inter-conversion of kinetically mixed photons and dark photons, which may

    更新日期:2020-10-02
  • Reacceleration of charged dark matter
    J. Cosmol. Astropart. Phys. (IF 5.21) Pub Date : 2020-09-30
    M. Kachelrieß and J. Tjemsland

    Charged particles scattering on moving inhomogenities of the magnetised interstellar medium can gain energy through the process of second-order Fermi acceleration. This energy gain depletes in turn the magnetic wave spectrum around the resonance wave-vector k ~ 1/ R L , where R L is the Larmor radius of the charged particle. This energy transfer can prohibit the cascading of magnetic turbulence to

    更新日期:2020-10-02
  • Erratum: Multiscatter capture of superheavy dark matter by Pop III stars
    J. Cosmol. Astropart. Phys. (IF 5.21) Pub Date : 2020-09-30
    Cosmin Ilie and Saiyang Zhang

    In this erratum, we fix a typo and an error in two of the equations used in our paper titled "Multiscatter capture of superheavy dark matter by Pop III stars," published in JCAP 12 (2019) 051, hereafter IZ19. The typo was just cosmetic, appeared only once, and in the entirety of our work, we used the correct spelling for that equation, so none of the results is affected. The error is propagated from

    更新日期:2020-10-02
  • Dark matter from primordial quantum information
    J. Cosmol. Astropart. Phys. (IF 5.21) Pub Date : 2020-09-30
    César Gómez and Raul Jimenez

    We suggest a general relation between the position of the cosmic microwave background temperature power spectrum peaks and the inflationary slow roll parameter ##IMG## [https://ej.iop.org/icons/Entities/epsilon.gif] {epsilon} . This relation is based on interpreting the variable setting the position of the peaks as the quantum distance between the end of inflation and recombination. This distance is

    更新日期:2020-10-02
  • Constraints on primordial gravitational waves from the cosmic microwave background
    J. Cosmol. Astropart. Phys. (IF 5.21) Pub Date : 2020-09-30
    Thomas J. Clarke, Edmund J. Copeland and Adam Moss

    Searches for primordial gravitational waves have resulted in constraints in a large frequency range from a variety of sources. The standard Cosmic Microwave Background (CMB) technique is to parameterise the tensor power spectrum in terms of the tensor-to-scalar ratio, r , and spectral index, n t , and constrain these using measurements of the temperature and polarization power spectra. Another method

    更新日期:2020-10-02
  • Inflation in the parity-conserving Poincaré gauge cosmology
    J. Cosmol. Astropart. Phys. (IF 5.21) Pub Date : 2020-09-30
    Hongchao Zhang and Lixin Xu

    The general Poincaré gauge cosmology given by a nine-parameter parity-conserving gravitational Lagrangian with ghost- and tachyon-free conditions is studied from the perspective of field theory. By introducing new variables for replacing two (pseudo-) scalar torsions, the Poincaré gauge cosmological system can be recast into a gravitational system coupled to two-scalar fields with a potential up to

    更新日期:2020-10-02
  • Addendum: Cosmological dependence of non-resonantly produced sterile neutrinos
    J. Cosmol. Astropart. Phys. (IF 5.21) Pub Date : 2020-09-30
    Graciela B. Gelmini, Philip Lu and Volodymyr Takhistov

    In this addendum to the article JCAP 12 (2019) 047 on the cosmological dependence of non-resonantly produced sterile neutrinos we discuss, using an analytic treatment, the parameter regions of large active-sterile neutrino mixing angles where sterile neutrinos can approach thermalization. We show that these additional considerations affect only large active-sterile neutrino mixing already rejected

    更新日期:2020-10-02
  • Gravitational reheating and superheavy Dark Matter creation after inflation with non-minimal coupling
    J. Cosmol. Astropart. Phys. (IF 5.21) Pub Date : 2020-09-29
    E. Babichev, D. Gorbunov, S. Ramazanov and L. Reverberi

    We discuss the gravitational creation of superheavy particles χ in an inflationary scenario with a quartic potential and a non-minimal coupling between the inflaton ##IMG## [https://ej.iop.org/icons/Entities/varphi.gif] {varphi} and the Ricci curvature:ξ ##IMG## [https://ej.iop.org/icons/Entities/varphi.gif] {varphi} 2 R /2. We show that for largeconstantsξ ##IMG## [https://ej.iop.org/icons/Entities/gg

    更新日期:2020-09-30
  • A low Hubble constant from galaxy distribution observations
    J. Cosmol. Astropart. Phys. (IF 5.21) Pub Date : 2020-09-28
    R.F.L. Holanda, G. Pordeus-da-Silva and S.H. Pereira

    An accurate determination of the Hubble constant remains a puzzle in observational cosmology. The possibility of a new physics has emerged with a significant tension between the current expansion rate of our Universe measured from the cosmic microwave background by the Planck satellite and from local methods. In this paper, new tight estimates on this parameter are obtained by considering two data

    更新日期:2020-09-29
  • The relativistic galaxy number counts in the weak field approximation
    J. Cosmol. Astropart. Phys. (IF 5.21) Pub Date : 2020-09-28
    Enea Di Dio and Florian Beutler

    We present a novel approach to compute systematically the relativistic projection effects at any order in perturbation theory within the weak field approximation. In this derivation the galaxy number counts is written completely in terms of the redshift perturbation. The relativistic effects break the symmetry along the line-of-sight and they source, contrarily to the standard perturbation theory,

    更新日期:2020-09-29
  • New models with independent dynamical torsion and nonmetricity fields
    J. Cosmol. Astropart. Phys. (IF 5.21) Pub Date : 2020-09-28
    Sebastian Bahamonde and Jorge Gigante Valcarcel

    We propose a gravitational model which allows the independent dynamical behaviour of the torsion and nonmetricity fields to be displayed in the framework of Metric-Affine gauge theory of gravity. For this task, we derive a new exact black hole solution referred to this model which extends the role of torsion of the main well-known exact solutions based on Weyl-Cartan geometry and constitutes the first

    更新日期:2020-09-29
  • Blind Observers of the Sky
    J. Cosmol. Astropart. Phys. (IF 5.21) Pub Date : 2020-09-28
    Samuel Brieden, Héctor Gil-Marín, Licia Verde and José Luis Bernal

    The concept of blind analysis , a key procedure to remove the human-based systematic error called confirmation bias , has long been an integral part of data analysis in many research areas. In cosmology, blind analysis is recently making its entrance, as the field progresses into a fully fledged high-precision science. The credibility, reliability and robustness of results from future sky-surveys will

    更新日期:2020-09-29
  • Constraining the growth rate by combining multiple future surveys
    J. Cosmol. Astropart. Phys. (IF 5.21) Pub Date : 2020-09-28
    Jan-Albert Viljoen, José Fonseca and Roy Maartens

    The growth rate of large-scale structure provides a powerful consistency test of the standard cosmological model and a probe of possible deviations from general relativity. We use a Fisher analysis to forecast constraints on the growth rate from a combination of next-generation spectroscopic surveys. In the overlap survey volumes, we use a multi-tracer analysis to significantly reduce the effect of

    更新日期:2020-09-29
  • The two body problem in the presence of dark energy and modified gravity: application to the Local Group
    J. Cosmol. Astropart. Phys. (IF 5.21) Pub Date : 2020-09-28
    M. McLeod and O. Lahav

    We explore mass estimation of the Local Group via the use of the simple, dynamical `timing argument' in the context of a variety of theories of dark energy and modified gravity: a cosmological constant, a perfect fluid with constant equation of state w , quintessence (minimally coupled scalar field), MOND, and symmetrons (coupled scalar field). We explore generic coupled scalar field theories, with

    更新日期:2020-09-29
  • Inflation wars: a new hope
    J. Cosmol. Astropart. Phys. (IF 5.21) Pub Date : 2020-09-28
    Ryan E. Keeley, Arman Shafieloo, Dhiraj Kumar Hazra and Tarun Souradeep

    We explore a class of primordial power spectra that can fit the observed anisotropies in the cosmic microwave background well and that predicts a value for the Hubble parameter consistent with the local measurement of H 0 = 74 km/s/Mpc. This class of primordial power spectrum consists of a continuous deformation between the best-fit power law primordial power spectrum and the primordial power spectrum

    更新日期:2020-09-29
  • Big bang nucleosynthesis constraints on sterile neutrino and lepton asymmetry of the Universe
    J. Cosmol. Astropart. Phys. (IF 5.21) Pub Date : 2020-09-27
    Graciela B. Gelmini, Masahiro Kawasaki, Alexander Kusenko, Kai Murai and Volodymyr Takhistov

    We consider the cosmological effects of sterile neutrinos with the masses of 150–450 MeV . The decay of sterile neutrinos changes the thermal history of the Universe and affects the energy density of radiation at recombination and the big bang nucleosynthesis (BBN) results. We derive severe constraints on the parameters of sterile neutrinos from the primordial abundances of helium-4 and deuterium.

    更新日期:2020-09-28
  • Non-canonical kinetic structures in the swampland
    J. Cosmol. Astropart. Phys. (IF 5.21) Pub Date : 2020-09-27
    Adam R. Solomon and Mark Trodden

    We consider how the swampland criteria might be applied to models in which scalar fields have nontrivial kinetic terms, particularly in the context of P ( ##IMG## [https://ej.iop.org/icons/Entities/phi.gif] {phi} , X ) theories, popularly used in approaches to inflation, to its alternatives, and to the problem of late-time cosmic acceleration. By embedding such theories in canonical multi-field models

    更新日期:2020-09-28
  • Non-linear structure formation for dark energy models with a Steep Equation of State
    J. Cosmol. Astropart. Phys. (IF 5.21) Pub Date : 2020-09-27
    N. Chandrachani Devi, M. Jaber-Bravo, G. Aguilar-Argüello, O. Valenzuela, H. Velázquez and A. de la Macorra

    We study the non-linear regime of large scale structure formation considering a dynamical dark energy (DE) component determined by a Steep Equation of State parametrization (SEoS), w ( z )= w 0 + w i ( z / z T ) q 1+( z / z T ) q . In order to perform the model exploration at low computational cost, we modified the publicly available L-PICOLA code. We incorporate the DE model employing the first and

    更新日期:2020-09-28
  • Measurement of the B-band galaxy Luminosity Function with Approximate Bayesian Computation
    J. Cosmol. Astropart. Phys. (IF 5.21) Pub Date : 2020-09-27
    Luca Tortorelli, Martina Fagioli, Jörg Herbel, Adam Amara, Tomasz Kacprzak and Alexandre Refregier

    The galaxy Luminosity Function (LF) is a key observable for galaxy formation, evolution studies and for cosmology. In this work, we propose a novel technique to forward model wide-field broad-band galaxy surveys using the fast image simulator UFig and measure the LF of galaxies in the B-band. We use Approximate Bayesian Computation (ABC) to constrain the galaxy population model parameters of the simulations

    更新日期:2020-09-28
  • How attractive is the isotropic attractor solution of axion-SU(2) inflation?
    J. Cosmol. Astropart. Phys. (IF 5.21) Pub Date : 2020-09-23
    Ira Wolfson, Azadeh Maleknejad and Eiichiro Komatsu

    The key to the phenomenological success of inflation models with axion and SU(2) gauge fields is the isotropic background of the SU(2) field. Previous studies showed that this isotropic background is an attractor solution during inflation starting from anisotropic (Bianchi type I) spacetime; however, not all possible initial anisotropic parameter space was explored. In this paper, we explore more generic

    更新日期:2020-09-24
  • Primordial black hole constraints with large extra dimensions
    J. Cosmol. Astropart. Phys. (IF 5.21) Pub Date : 2020-09-23
    George Johnson

    We study how the constraints on the primordial black hole density arising from the extragalactic photon background are modified in the scenario that there exist extra large spatial dimensions. We find that though the overall magnitude of the constraints is not substantially different, the mass ranges to which they apply are, and for some choices of mass it is possible for the black holes to constitute

    更新日期:2020-09-24
  • Erratum: Search for photons with energies above 18 eV using the hybrid detector of the Pierre Auger Observatory
    J. Cosmol. Astropart. Phys. (IF 5.21) Pub Date : 2020-09-22
    A. Aab, P. Abreu, M. Aglietta, I. Al Samarai, I.F.M. Albuquerque, I. Allekotte, A. Almela, J. Alvarez Castillo, J. Alvarez-Muñiz, G.A. Anastasi, L. Anchordoqui, B. Andrada, S. Andringa, C. Aramo, F. Arqueros, N. Arsene, H. Asorey, P. Assis, J. Aublin, G. Avila, A.M. Badescu, A. Balaceanu, R.J. Barreira Luz, J.J. Beatty, K.H. Becker, J.A. Bellido, C. Berat, M.E. Bertaina, X. Bertou, P.L. Biermann, P

    Please see the PDF file for details.

    更新日期:2020-09-23
  • Tests of Dark MACHOs: lensing, accretion, and glow
    J. Cosmol. Astropart. Phys. (IF 5.21) Pub Date : 2020-09-21
    Yang Bai, Andrew J. Long and Sida Lu

    Dark matter could take the form of dark massive compact halo objects (dMACHOs); i.e., composite objects that are made up of dark-sector elementary particles, that could have a macroscopic mass from the Planck scale to above the solar mass scale, and that also admit a wide range of energy densities and sizes. Concentrating on the gravitational interaction of dMACHOs with visible matter, we map out the

    更新日期:2020-09-22
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