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  • Robustness of slow contraction to cosmic initial conditions
    J. Cosmol. Astropart. Phys. (IF 5.21) Pub Date : 2020-08-12
    Anna Ijjas, William G. Cook, Frans Pretorius, Paul J. Steinhardt and Elliot Y. Davies

    We present numerical relativity simulations of cosmological scenarios in which the universe is smoothed and flattened by undergoing a phase of slow contraction and test their sensitivity to a wide range of initial conditions. Our numerical scheme enables the variation of all freely specifiable physical quantities that characterize the initial spatial hypersurface, such as the initial shear and spatial

    更新日期:2020-08-14
  • Detection of WHIM in the Planck data using Stack First approach
    J. Cosmol. Astropart. Phys. (IF 5.21) Pub Date : 2020-08-12
    Baibhav Singari, Tuhin Ghosh and Rishi Khatri

    We detect the diffuse thermal Sunyaev-Zeldovich (tSZ) effect from the gas filaments between the Luminous Red Galaxy (LRG) pairs using a new approach relying on stacking the individual frequency maps. We apply and demonstrate our method on 08800 LRG pairs in the SDSS DR12 catalogue selected with an improved selection criterion that ensures minimal contamination by the Galactic CO emission as well as

    更新日期:2020-08-14
  • Primordial black holes from pre-big bang inflation
    J. Cosmol. Astropart. Phys. (IF 5.21) Pub Date : 2020-08-12
    P. Conzinu, M. Gasperini and G. Marozzi

    We discuss the possibility of producing a significant fraction of dark matter in the form of primordial black holes in the context of the pre-big bang inflationary scenario. We take into account, to this purpose, the enhancement of curvature perturbations possibly induced by a variation of the sound-speed parameter c s during the string phase of high-curvature inflation. After imposing all relevant

    更新日期:2020-08-14
  • Tidal Love numbers of Proca stars
    J. Cosmol. Astropart. Phys. (IF 5.21) Pub Date : 2020-08-12
    Carlos A.R. Herdeiro, Grigoris Panotopoulos and Eugen Radu

    Proca stars [1] are everywhere regular, asymptotically flat self-gravitating solitons composed of complex, massive vector bosons, forming a macroscopic, star-sized, Bose-Einstein condensate. They have been suggested as a classical, dynamical model of exotic compact objects, black hole mimickers and dark matter candidates. In spherical symmetry, they are qualitatively similar to their scalar cousins

    更新日期:2020-08-14
  • Generating primordial features at large scales in two field models of inflation
    J. Cosmol. Astropart. Phys. (IF 5.21) Pub Date : 2020-08-11
    Matteo Braglia, Dhiraj Kumar Hazra, L. Sriramkumar and Fabio Finelli

    We investigate the generation of features at large scales in the primordial power spectrum (PPS) when inflation is driven by two scalar fields. In canonical single field models of inflation, these features are often generated due to deviations from the slow-roll regime. While deviations from slow-roll can be naturally achieved in two field models due to a sharp turn in the trajectory in the field space

    更新日期:2020-08-12
  • Ghost from constraints: a generalization of Ostrogradsky theorem
    J. Cosmol. Astropart. Phys. (IF 5.21) Pub Date : 2020-08-11
    Katsuki Aoki and Hayato Motohashi

    Ostrogradsky theorem states that Hamiltonian is unbounded when Euler-Lagrange equations are higher than second-order differential equations under the nondegeneracy assumption. Since higher-order nondegenerate Lagrangian can be always recast into an equivalent system with at most first-order derivatives by introducing auxiliary variables and constraints, it is conceivable that the link between ghost

    更新日期:2020-08-12
  • Effective field theory of anisotropic inflation and beyond
    J. Cosmol. Astropart. Phys. (IF 5.21) Pub Date : 2020-08-11
    Jinn-Ouk Gong, Toshifumi Noumi, Gary Shiu, Jiro Soda, Kazufumi Takahashi and Masahide Yamaguchi

    We develop an effective-field-theory (EFT) framework for inflation with various symmetry breaking pattern. As a prototype, we formulate anisotropic inflation from the perspective of EFT and construct an effective action of the Nambu-Goldstone bosons for the broken time translation and rotation symmetries. We also calculate the statistical anisotropy in the scalar two-point correlation function for

    更新日期:2020-08-12
  • On cosmological signatures of baryons-dark energy elastic couplings
    J. Cosmol. Astropart. Phys. (IF 5.21) Pub Date : 2020-08-10
    Jose Beltrán Jiménez, Dario Bettoni, David Figueruelo and Florencia A. Teppa Pannia

    We consider a scenario where dark energy and baryons are dynamically coupled without any energy transfer. In this scenario, the background cosmology is unaffected and, at the perturbations level, the coupling only appears through the corresponding Euler equations of dark energy and baryons. We then explore some phenomenological consequences of this scenario and their signatures in several cosmological

    更新日期:2020-08-11
  • Kantowski-Sachs Einstein-aether scalar field cosmological models: the sequel
    J. Cosmol. Astropart. Phys. (IF 5.21) Pub Date : 2020-08-10
    S. Mohandas, R.J. van den Hoogen, D. Winters and M. Dala

    Utilizing the autonomous system of ordinary differential equations derived in [1] to define the evolution, we further investigate a class of cosmological models within an Einstein-aether gravitational framework by introducing a non-trivial coupling between the shear of the aether field to the scalar field on the future asymptotic solution. We subsequently conduct qualitative and numerical stability

    更新日期:2020-08-11
  • Extreme mass ratio inspirals with scalar hair
    J. Cosmol. Astropart. Phys. (IF 5.21) Pub Date : 2020-08-10
    Adrien Kuntz, Riccardo Penco and Federico Piazza

    Stellar mass objects orbiting around supermassive black holes are primary targets for future gravitational wave detectors like LISA. However, in theories beyond general relativity, the corresponding waveform templates are still relatively poorly known. We propose a universal description for these systems which applies to any black hole with a non trivial scalar profile, or scalar hair . To this aim

    更新日期:2020-08-11
  • A critique of covariant emergent gravity
    J. Cosmol. Astropart. Phys. (IF 5.21) Pub Date : 2020-08-10
    Kirill Zatrimaylov

    I address some problems encountered in the formulation of relativistic models encompassing the MOND phenomenology of radial acceleration. I explore scalar and vector theories with fractional kinetic terms and f ( R )-type gravity, demanding that the energy density be bounded from below and that superluminal modes be absent, but also that some consistency constraints with observational results hold

    更新日期:2020-08-11
  • Analysis on the black hole formations inside old neutron stars by isospin-violating dark matter with self-interaction
    J. Cosmol. Astropart. Phys. (IF 5.21) Pub Date : 2020-08-10
    Guey-Lin Lin and Yen-Hsun Lin

    Fermionic dark matter (DM) with attractive self-interaction is possible to form black holes (BH) inside the Gyr-old neutron stars (NS). Therefore by observing such NS corresponding to their adjacent DM environments can place bounds on DM properties, eg. DM-baryon cross section σχ b , DM mass m χ , dark coupling α χ and mediator mass m ##IMG## [https://ej.iop.org/icons/Entities/phi.gif] {phi} . In case

    更新日期:2020-08-11
  • Feeble neutrino portal dark matter at neutrino detectors
    J. Cosmol. Astropart. Phys. (IF 5.21) Pub Date : 2020-08-09
    Priyotosh Bandyopadhyay, Eung Jin Chun and Rusa Mandal

    We explore the neutrino portal dark matter (DM) at its minimum of field content having two dark sector particles coupled to a right-handed neutrino. Assuming the feeble nature of their interactions with the standard model (SM) particles, we analyze the freeze-in production of the observed DM relic density characterized by three different categories depending on the major production mechanisms. The

    更新日期:2020-08-10
  • Lifting the core-collapse supernova bounds on keV-mass sterile neutrinos
    J. Cosmol. Astropart. Phys. (IF 5.21) Pub Date : 2020-08-09
    Anna M. Suliga, Irene Tamborra and Meng-Ru Wu

    We explore the energy and entropy transport as well as the lepton number variation induced from the mixing between electron and sterile neutrinos with keV mass in the supernova core. We develop a radial- and time-dependent treatment of the ν s -ν e mixing, by including ordinary matter effects, reconversions between sterile and electron antineutrinos, as well as the collisional production of sterile

    更新日期:2020-08-10
  • Induced gravitational waves as a probe of thermal history of the universe
    J. Cosmol. Astropart. Phys. (IF 5.21) Pub Date : 2020-08-09
    Guillem Domènech, Shi Pi and Misao Sasaki

    The scalar perturbation induced gravitational waves are a probe of the primordial density perturbation spectrum on small scales. In this paper, we show that they can also probe the thermal history of the universe. We assume the universe underwent a stage with a constant equation of state parameter w , followed by the radiation-dominated stage of the conventional big bang universe. We find that the

    更新日期:2020-08-10
  • Perturbative deflection angle for signal with finite distance and general velocities
    J. Cosmol. Astropart. Phys. (IF 5.21) Pub Date : 2020-08-06
    Ke Huang and Junji Jia

    We propose a perturbative method to compute the deflection angle of both null and massive particles for source and detector at finite distance. This method applies universally to the motion of particles with general velocity in the equatorial plane of stationary axisymmetric spacetimes or static spherical symmetric spacetimes that are asymptotically flat. The resultant deflection angle automatically

    更新日期:2020-08-10
  • MeV-scale reheating temperature and cosmological production of light sterile neutrinos
    J. Cosmol. Astropart. Phys. (IF 5.21) Pub Date : 2020-08-05
    Takuya Hasegawa, Nagisa Hiroshima, Kazunori Kohri, Rasmus S.L. Hansen, Thomas Tram and Steen Hannestad

    We investigate how sterile neutrinos with a range of masses influence cosmology in MeV-scale reheating temperature scenarios. By computing the production of sterile neutrinos through the combination of mixing and scattering in the early Universe, we find that light sterile neutrinos, with masses and mixings as inferred from short-baseline neutrino oscillation experiments, are consistent with big-bang

    更新日期:2020-08-06
  • Dirac and Majorana neutrino signatures of primordial black holes
    J. Cosmol. Astropart. Phys. (IF 5.21) Pub Date : 2020-08-05
    Cecilia Lunardini and Yuber F. Perez-Gonzalez

    We study Primordial Black Holes (PBHs) as sources of massive neutrinos via Hawking radiation. Under the hypothesis that black holes emit neutrino mass eigenstates, we describe quantitatively how the PBH evolution and lifetime is affected by the mass and fermionic—Dirac or Majorana—nature of neutrinos. In the case of Dirac neutrinos, PBHs radiate right-handed and left-handed neutrinos in equal amounts

    更新日期:2020-08-06
  • Combined analysis of Planck and SPTPol data favors the early dark energy models
    J. Cosmol. Astropart. Phys. (IF 5.21) Pub Date : 2020-08-04
    Anton Chudaykin, Dmitry Gorbunov and Nikita Nedelko

    We study the implications of the Planck temperature power spectrum at low multipoles, 0ℓ<100, and SPTPol data. We show that this combination predicts consistent lensing-induced smoothing of acoustic peaks within ΛCDM cosmology and yields the robust predictions of the cosmological parameters. Combining only the Planck large-scale temperature data and the SPTPol polarization and lensing measurements

    更新日期:2020-08-05
  • A precision calculation of relic neutrino decoupling
    J. Cosmol. Astropart. Phys. (IF 5.21) Pub Date : 2020-08-04
    Kensuke Akita and Masahide Yamaguchi

    We study the distortions of equilibrium spectra of relic neutrinos due to the interactions with electrons, positrons, and neutrinos in the early Universe. We solve the integro-differential kinetic equations for the neutrino density matrix, including three-flavor oscillations and finite temperature corrections from QED up to the next-to-leading order O ( e 3 ) for the first time. In addition, the equivalent

    更新日期:2020-08-05
  • What could be the observational signature of dark matter in globular clusters?
    J. Cosmol. Astropart. Phys. (IF 5.21) Pub Date : 2020-08-04
    Elaine C.F.S. Fortes, Oswaldo D. Miranda, Floyd W. Stecker and Carlos A. Wuensche

    Here we investigate the possibility that some globular clusters (GCs) harbor intermediate mass black holes (BH) in their centers and are also embedded in a low-mass dark matter (DM) halo. Up to date, there is no evidence on whether or not GCs have DM in their constitution. For standard cold DM cosmology, it is expected that GCs form with their own DM halos. Other studies investigate the possibility

    更新日期:2020-08-05
  • Precise WIMP dark matter abundance and Standard Model thermodynamics
    J. Cosmol. Astropart. Phys. (IF 5.21) Pub Date : 2020-08-04
    Ken'ichi Saikawa and Satoshi Shirai

    A weakly interacting massive particle (WIMP) is a leading candidate of the dark matter. The WIMP dark matter abundance is determined by the freeze-out mechanism. Once we know the property of the WIMP particle such as the mass and interaction, we can predict the dark matter abundance. There are, however, several uncertainties in the estimation of the WIMP dark matter abundance. In this work, we focus

    更新日期:2020-08-05
  • Revisiting supernova constraints on a light CP-even scalar
    J. Cosmol. Astropart. Phys. (IF 5.21) Pub Date : 2020-08-03
    P.S. Bhupal Dev, Rabindra N. Mohapatra and Yongchao Zhang

    A light CP-even Standard Model (SM) gauge-singlet scalar S can be produced abundantly in the supernova core, via the nucleon bremsstrahlung process N N → N N S , due to its mixing with the SM Higgs boson. Including the effective S coupling to both nucleons and the pion mediators, we evaluate the production amplitude for the S particle and point out a key difference with the well-known light CP-odd

    更新日期:2020-08-04
  • Attractors, bifurcations and curvature in multi-field inflation
    J. Cosmol. Astropart. Phys. (IF 5.21) Pub Date : 2020-08-03
    Perseas Christodoulidis, Diederik Roest and Evangelos I. Sfakianakis

    Recent years have seen the introduction of various multi-field inflationary scenarios in which the curvature and geodesics of the scalar manifold play a crucial role. We outline a simple description that unifies these different proposals and discuss their stability criteria. We demonstrate how the underlying dynamics is governed by an effective potential, whose critical points and bifurcations determine

    更新日期:2020-08-04
  • Machine learning meets the redshift evolution of the CMB temperature
    J. Cosmol. Astropart. Phys. (IF 5.21) Pub Date : 2020-08-03
    Rubén Arjona

    We present a model independent and non-parametric reconstruction with a Machine Learning algorithm of the redshift evolution of the Cosmic Microwave Background (CMB) temperature from a wide redshift range z ##IMG## [https://ej.iop.org/icons/Entities/in.gif] {in} [0,3] without assuming any dark energy model, an adiabatic universe or photon number conservation. In particular we use the genetic algorithms

    更新日期:2020-08-04
  • Primordial dark matter from curvature induced symmetry breaking
    J. Cosmol. Astropart. Phys. (IF 5.21) Pub Date : 2020-08-03
    Laura Laulumaa, Tommi Markkanen and Sami Nurmi

    We demonstrate that adiabatic dark matter can be generated by gravity induced symmetry breaking during inflation. We study a Z 2 symmetric scalar singlet that couples to other fields only through gravity and for which the symmetry is broken by the spacetime curvature during inflation when the non-minimal coupling ξ is negative. We find that the symmetry breaking leads to the formation of adiabatic

    更新日期:2020-08-04
  • What can we learn by combining the skew spectrum and the power spectrum?
    J. Cosmol. Astropart. Phys. (IF 5.21) Pub Date : 2020-08-03
    Ji-Ping Dai, Licia Verde and Jun-Qing Xia

    Clustering of the large scale structure provides complementary information to the measurements of the cosmic microwave background anisotropies through power spectrum and bispectrum of density perturbations. Extracting the bispectrum information, however, is more challenging than it is from the power spectrum due to the complex models and the computational cost to measure the signal and its covariance

    更新日期:2020-08-04
  • Big Bounce Baryogenesis
    J. Cosmol. Astropart. Phys. (IF 5.21) Pub Date : 2020-08-03
    Neil D. Barrie

    We explore the possibility of an Ekpyrotic contraction phase harbouring a mechanism for Baryogenesis. A Chern-Simons coupling between the fast-rolling Ekpyrotic scalar and the Standard Model Hypercharge gauge field enables the generation of a non-zero helicity during the contraction phase. The baryon number subsequently produced at the Electroweak Phase Transition is consistent with observation for

    更新日期:2020-08-04
  • A null test of the equivalence principle using relativistic effects in galaxy surveys
    J. Cosmol. Astropart. Phys. (IF 5.21) Pub Date : 2020-08-03
    Camille Bonvin, Felipe Oliveira Franco and Pierre Fleury

    The weak equivalence principle is one of the cornerstone of general relativity. Its validity has been tested with impressive precision in the Solar System, with experiments involving baryonic matter and light. However, on cosmological scales and when dark matter is concerned, the validity of this principle is still unknown. In this paper we construct a null test that probes the validity of the equivalence

    更新日期:2020-08-04
  • Accessing the axion via compact object binaries
    J. Cosmol. Astropart. Phys. (IF 5.21) Pub Date : 2020-08-03
    Michael Kavic, Steven L. Liebling, Matthew Lippert and John H. Simonetti

    Black holes in binaries with other compact objects can provide natural venues for indirect detection of axions or other ultralight fields. The superradiant instability associated with a rapidly spinning black hole leads to the creation of an axion cloud which carries energy and angular momentum from the black hole. This cloud will then decay via gravitational wave emission. We show that the energy

    更新日期:2020-08-04
  • Generating PBHs and small-scale GWs in two-field models of inflation
    J. Cosmol. Astropart. Phys. (IF 5.21) Pub Date : 2020-08-02
    Matteo Braglia, Dhiraj Kumar Hazra, Fabio Finelli, George F. Smoot, L. Sriramkumar and Alexei A. Starobinsky

    Primordial black holes (PBHs) generated by gravitational collapse of large primordial overdensities can be a fraction of the observed dark matter. In this paper, we introduce a mechanism to produce a large peak in the primordial power spectrum (PPS) in two-field inflationary models characterized by two stages of inflation based on a large non-canonical kinetic coupling. This mechanism is generic to

    更新日期:2020-08-03
  • Probing cosmic strings with gravitational-wave fringe
    J. Cosmol. Astropart. Phys. (IF 5.21) Pub Date : 2020-07-30
    Sunghoon Jung and TaeHun Kim

    Cosmic strings are important remnants of early-Universe phase transitions. We show that they can be probed by Gravitational Waves (GWs) from compact binary mergers. If such chirping GW passes by a cosmic string, it is gravitationally lensed and left with a characteristic signal of the lensing—the GW fringe. It is observable naturally through the frequency chirping of GWs. This allows to probe cosmic

    更新日期:2020-07-31
  • A consistent model of non-singular Schwarzschild black hole in loop quantum gravity and its quasinormal modes
    J. Cosmol. Astropart. Phys. (IF 5.21) Pub Date : 2020-07-30
    Mariam Bouhmadi-López, Suddhasattwa Brahma, Che-Yu Chen, Pisin Chen and Dong-han Yeom

    We investigate the interior structure, perturbations, and the associated quasinormal modes of a quantum black hole model recently proposed by Bodendorfer, Mele, and Münch (BMM). Within the framework of loop quantum gravity, the quantum parameters in the BMM model are introduced through polymerization, consequently replacing the Schwarzschild singularity with a spacelike transition surface. By treating

    更新日期:2020-07-31
  • Testing non-minimally coupled BEC dark matter with gravitational waves
    J. Cosmol. Astropart. Phys. (IF 5.21) Pub Date : 2020-07-30
    Dimitar Ivanov and Stefano Liberati

    We study the phenomenology associated to non-minimally coupled dark matter. In particular, we consider the model where the non-minimal coupling arises from the formation of relativistic Bose-Einstein condensates in high density regions of dark matter [1]. This non-minimal coupling is of Horndeski type and leads to a local modification of the speed of gravity with respect to the speed of light. Therefore

    更新日期:2020-07-31
  • Merger of dark matter axion clumps and resonant photon emission
    J. Cosmol. Astropart. Phys. (IF 5.21) Pub Date : 2020-07-30
    Mark P. Hertzberg, Yao Li and Enrico D. Schiappacasse

    A portion of light scalar dark matter, especially axions, may organize into gravitationally bound clumps (stars) and be present in large number in the galaxy today. It is therefore of utmost interest to determine if there are novel observational signatures of this scenario. Work has shown that for moderately large axion-photon couplings, such clumps can undergo parametric resonance into photons, for

    更新日期:2020-07-31
  • Quantum effects in Palatini Higgs inflation
    J. Cosmol. Astropart. Phys. (IF 5.21) Pub Date : 2020-07-30
    Mikhail Shaposhnikov, Andrey Shkerin and Sebastian Zell

    We study quantum effects in Higgs inflation in the Palatini formulation of gravity, in which the metric and connection are treated as independent variables. We exploit the fact that the cutoff, above which perturbation theory breaks down, is higher than the scale of inflation. Unless new physics above the cutoff leads to unnaturally large corrections, we can directly connect low-energy physics and

    更新日期:2020-07-31
  • Why the mean mass of primordial black hole distribution is close to 10 M ⊙
    J. Cosmol. Astropart. Phys. (IF 5.21) Pub Date : 2020-07-29
    A. Dolgov and K. Postnov

    It is shown that a mechanism of PBH formation from high-baryon bubbles with log-normal mass spectrum naturally leads to the central mass of the PBH distribution close to ten solar masses independently of the model details. This result is in good agreement with observations.

    更新日期:2020-07-30
  • The stabilizing effect of gravity made simple
    J. Cosmol. Astropart. Phys. (IF 5.21) Pub Date : 2020-07-28
    J.R. Espinosa

    A new approach to vacuum decay in quantum field theory, based on a simple variational formulation in field space using a tunneling potential, is ideally suited to study the effects of gravity on such decays. The method allows to prove in new and simple ways many results, among others, that gravitational corrections tend to make Minkowski or Anti de Sitter false vacua more stable semiclassically or

    更新日期:2020-07-29
  • Consistent modeling of velocity statistics and redshift-space distortions in one-loop perturbation theory
    J. Cosmol. Astropart. Phys. (IF 5.21) Pub Date : 2020-07-28
    Shi-Fan Chen, Zvonimir Vlah and Martin White

    The peculiar velocities of biased tracers of the cosmic density field contain important information about the growth of large scale structure and generate anisotropy in the observed clustering of galaxies. Using N-body data, we show that velocity expansions for halo redshift-space power spectra are converged at the percent-level at perturbative scales for most line-of-sight angles μ when the first

    更新日期:2020-07-29
  • Constraining the cosmological evolution of scalar-tensor theories with local measurements of the time variation of G
    J. Cosmol. Astropart. Phys. (IF 5.21) Pub Date : 2020-07-28
    Clare Burrage and Johannes Dombrowski

    We determine the conditions for which the constraints from lunar laser ranging on the time evolution of the local gravitational constant can be extrapolated to impose constraints on the time evolution of the cosmological gravitational constant in scalar-tensor theories of modified gravity. We allow for the possibility that the scalar-tensor theories are non-linear and contain a screening mechanism

    更新日期:2020-07-29
  • New measures to test modified gravity cosmologies
    J. Cosmol. Astropart. Phys. (IF 5.21) Pub Date : 2020-07-27
    Jiro Matsumoto, Teppei Okumura and Misao Sasaki

    The observed accelerated expansion of the Universe may be explained by dark energy or the breakdown of general relativity (GR) on cosmological scales. When the latter case, a modified gravity scenario, is considered, it is often assumed that the background evolution is the same as the ΛCDM model but the density perturbation evolves differently. In this paper, we investigate more general classes of

    更新日期:2020-07-28
  • Rotating black holes in Eddington-inspired Born-Infeld gravity: an exact solution
    J. Cosmol. Astropart. Phys. (IF 5.21) Pub Date : 2020-07-27
    Merce Guerrero, Gerardo Mora-Pérez, Gonzalo J. Olmo, Emanuele Orazi and Diego Rubiera-Garcia

    We find an exact, rotating charged black hole solution within Eddington-inspired Born-Infeld gravity. To this end we employ a recently developed correspondence or mapping between modified gravity models built as scalars out of contractions of the metric with the Ricci tensor, and formulated in metric-affine spaces (Ricci-Based Gravity theories) and General Relativity. This way, starting from the Kerr-Newman

    更新日期:2020-07-28
  • Model independent measurement of the growth rate from the consistency relations of the LSS
    J. Cosmol. Astropart. Phys. (IF 5.21) Pub Date : 2020-07-26
    Marco Marinucci, Takahiro Nishimichi and Massimo Pietroni

    The consistency relations for the large scale structure provide a link between the amplitude of baryonic acoustic oscillations in the squeezed bispectrum (BS) and in the power spectrum (PS). This relation depends on the large scale bias of the considered tracer, b α , and on the growth rate of structures, f . Remarkably, originating from basic symmetry principles, this relation is exact and independent

    更新日期:2020-07-27
  • Model-independent energy budget of cosmological first-order phase transitions—A sound argument to go beyond the bag model
    J. Cosmol. Astropart. Phys. (IF 5.21) Pub Date : 2020-07-26
    Felix Giese, Thomas Konstandin and Jorinde van de Vis

    We study the energy budget of a first-order cosmological phase transition, which is an important factor in the prediction of the resulting gravitational wave spectrum. Formerly, this analysis was based mostly on simplified models as for example the bag equation of state. Here, we present a model-independent approach that is exact up to the temperature dependence of the speed of sound in the broken

    更新日期:2020-07-27
  • Gravitational decoherence of dark matter
    J. Cosmol. Astropart. Phys. (IF 5.21) Pub Date : 2020-07-26
    Itamar Allali and Mark P. Hertzberg

    Decoherence describes the tendency of quantum sub-systems to dynamically lose their quantum character. This happens when the quantum sub-system of interest interacts and becomes entangled with an environment that is traced out. For ordinary macroscopic systems, electromagnetic and other interactions cause rapid decoherence. However, dark matter (DM) may have the unique possibility of exhibiting naturally

    更新日期:2020-07-27
  • Classical decay rates of oscillons
    J. Cosmol. Astropart. Phys. (IF 5.21) Pub Date : 2020-07-26
    Hong-Yi Zhang, Mustafa A. Amin, Edmund J. Copeland, Paul M. Saffin and Kaloian D. Lozanov

    Oscillons are extremely long-lived, spatially-localized field configurations in real-valued scalar field theories that slowly lose energy via radiation of scalar waves. Before their eventual demise, oscillons can pass through (one or more) exceptionally stable field configurations where their decay rate is highly suppressed. We provide an improved calculation of the non-trivial behavior of the decay

    更新日期:2020-07-27
  • Rotating black holes in 4 D Einstein-Gauss-Bonnet gravity and its shadow
    J. Cosmol. Astropart. Phys. (IF 5.21) Pub Date : 2020-07-23
    Rahul Kumar and Sushant G. Ghosh

    Recently there has been a surge of interest in regularizing,a D → 4 limit of, the Einstein-Gauss-Bonnet (EGB) gravity, and the resulting regularized 4 D EGB gravity has nontrivial dynamics. The theory admits spherically symmetric black holes generalizing the Schwarzschild black holes. We consider the rotating black hole in regularized 4 D EGB gravity and discuss their horizon properties and shadow

    更新日期:2020-07-24
  • Gravitational waves from first-order cosmological phase transitions: lifetime of the sound wave source
    J. Cosmol. Astropart. Phys. (IF 5.21) Pub Date : 2020-07-22
    John Ellis, Marek Lewicki and José Miguel No

    We survey systematically the general parametrisations of particle-physics models for a first-order phase transition in the early universe, including models with polynomial potentials both with and without barriers at zero temperature, and Coleman-Weinberg-like models with potentials that are classically scale-invariant. We distinguish three possibilities for the transition—detonations, deflagrations

    更新日期:2020-07-23
  • Compensated isocurvature perturbations in the galaxy power spectrum
    J. Cosmol. Astropart. Phys. (IF 5.21) Pub Date : 2020-07-22
    Alexandre Barreira, Giovanni Cabass, Kaloian D. Lozanov and Fabian Schmidt

    We investigate the potential of the galaxy power spectrum to constrain compensated isocurvature perturbations (CIPs), primordial fluctuations in the baryon density that are compensated by fluctuations in CDM density to ensure an unperturbed total matter density. We show that CIPs contribute to the galaxy overdensity at linear order, and if they are close to scale-invariant, their effects are nearly

    更新日期:2020-07-23
  • The likelihood for LSS: stochasticity of bias coefficients at all orders
    J. Cosmol. Astropart. Phys. (IF 5.21) Pub Date : 2020-07-22
    Giovanni Cabass and Fabian Schmidt

    In the EFT of biased tracers the noise field ##IMG## [https://ej.iop.org/icons/Entities/epsilon.gif] {epsilon} g is not exactly uncorrelated with the nonlinear matter field δ. Its correlation with δ is effectively captured by adding stochasticities to each bias coefficient. We show that if these stochastic fields are Gaussian (the impact of their non-Gaussianity being subleading on quasi-linear scales

    更新日期:2020-07-23
  • Examining the weak cosmic censorship conjecture of RN-AdS black holes via the new version of the gedanken experiment
    J. Cosmol. Astropart. Phys. (IF 5.21) Pub Date : 2020-07-22
    Xin-Yang Wang and Jie Jiang

    Based on the new version of the gedanken experiment proposed by Sorce and Wald, we investigate the weak cosmic censorship conjecture (WCCC) for Reissner-Nordström-AdS (RN-AdS) black holes under the second-order approximation of the perturbation that comes from the matter fields. First of all, we propose that the cosmological constant is a portion of the matter fields. It means that the cosmological

    更新日期:2020-07-23
  • The n -point streaming model: how velocities shape correlation functions in redshift space
    J. Cosmol. Astropart. Phys. (IF 5.21) Pub Date : 2020-07-20
    Joseph Kuruvilla and Cristiano Porciani

    Starting from first principles, we derive the fundamental equations that relate the n -point correlation functions in real and redshift space. Our result generalises the so-called `streaming model' to higher-order statistics: the full n -point correlation in redshift-space is obtained as an integral of its real-space counterpart times the joint probability density of n −1 relative line-of-sight peculiar

    更新日期:2020-07-21
  • Modeling relativistic contributions to the halo power spectrum dipole
    J. Cosmol. Astropart. Phys. (IF 5.21) Pub Date : 2020-07-20
    Florian Beutler and Enea Di Dio

    We study the power spectrum dipole of an N-body simulation which includes relativistic effects through ray-tracing and covers the low redshift Universe up to z max = 0.465 (RayGalGroup simulation). We model relativistic corrections as well as wide-angle, evolution, window and lightcone effects. Our model includes all relativistic corrections up to third-order including third-order bias expansion. We

    更新日期:2020-07-21
  • String gases and the swampland
    J. Cosmol. Astropart. Phys. (IF 5.21) Pub Date : 2020-07-20
    Samuel Laliberte and Robert Brandenberger

    In this paper, we study some aspects of moduli stabilization using string gases in the context of the Swampland. In the framework which we derive, the matter Lagrangian for string gases yields a potential for the size moduli which satisfies the de Sitter conjecture with the condition|∇ V |/ V ≥ 1/√ p 1/ M p , where p is the number of compactified dimensions. Moreover, the moduli find themselves stabilized

    更新日期:2020-07-21
  • How Gaussian can the sky be? Primordial non-Gaussianity from quantum information
    J. Cosmol. Astropart. Phys. (IF 5.21) Pub Date : 2020-07-20
    César Gómez and Raul Jimenez

    Using the quantum information picture to describe the early universe as a time dependent quantum density matrix, with time playing the role of a stochastic variable, we compute the non-gaussian features in the distribution of primordial fluctuations. We use a quasi de Sitter model to compute the corresponding quantum Fisher information function as the second derivative of the relative entanglement

    更新日期:2020-07-21
  • Synergies across the spectrum for particle dark matter indirect detection: how HI intensity mapping meets gamma rays
    J. Cosmol. Astropart. Phys. (IF 5.21) Pub Date : 2020-07-20
    Elena Pinetti, Stefano Camera, Nicolao Fornengo and Marco Regis

    Neutral hydrogen (HI) intensity mapping traces the large-scale distribution of matter in the Universe and therefore should correlate with the gamma-ray emission originated from particle dark matter annihilation or from active galactic nuclei and star-forming galaxies, since the related processes occur in the same cosmic structures hosting HI. In this paper, we derive the cross-correlation signal between

    更新日期:2020-07-21
  • Soundness of dark energy properties
    J. Cosmol. Astropart. Phys. (IF 5.21) Pub Date : 2020-07-20
    Eleonora Di Valentino, Stefano Gariazzo, Olga Mena and Sunny Vagnozzi

    Type Ia Supernovae (SNeIa) used as standardizable candles have been instrumental in the discovery of cosmic acceleration, usually attributed to some form of dark energy (DE). Recent studies have raised the issue of whether intrinsic SNeIa luminosities might evolve with redshift. While the evidence for cosmic acceleration is robust to this possible systematic, the question remains of how much the latter

    更新日期:2020-07-21
  • Anisotropic instability in a higher order gravity theory
    J. Cosmol. Astropart. Phys. (IF 5.21) Pub Date : 2020-07-15
    Masroor C. Pookkillath, Antonio De Felice and Alexei A. Starobinsky

    We study a metric cubic gravity theory considering odd-parity modes of linear inhomogeneous perturbations on a spatially homogeneous Bianchi type I manifold close to the isotropic de Sitter spacetime. We show that in the regime of small anisotropy, the theory possesses new degrees of freedom compared to General Relativity, whose kinetic energy vanishes in the limit of exact isotropy. From the mass

    更新日期:2020-07-16
  • Constraints on neutrino emission from nearby galaxies using the 2MASS redshift survey and IceCube
    J. Cosmol. Astropart. Phys. (IF 5.21) Pub Date : 2020-07-15
    M.G. Aartsen, M. Ackermann, J. Adams, J.A. Aguilar, M. Ahlers, M. Ahrens, C. Alispach, K. Andeen, T. Anderson, I. Ansseau, G. Anton, C. Argüelles, J. Auffenberg, S. Axani, P. Backes, H. Bagherpour, X. Bai, A. Balagopal V., A. Barbano, S.W. Barwick, B. Bastian, V. Baum, S. Baur, R. Bay, J.J. Beatty, K.-H. Becker, J. Becker Tjus, S. BenZvi, D. Berley, E. Bernardini, D.Z. Besson, G. Binder, D. Bindig

    The distribution of galaxies within the local universe is characterized by anisotropic features. Observatories searching for the production sites of astrophysical neutrinos can take advantage of these features to establish directional correlations between a neutrino dataset and overdensities in the galaxy distribution in the sky. The results of two correlation searches between a seven-year time-integrated

    更新日期:2020-07-16
  • Back-reaction in massless de Sitter QFTs: holography, gravitational DBI action and f(R) gravity
    J. Cosmol. Astropart. Phys. (IF 5.21) Pub Date : 2020-07-15
    Jewel K. Ghosh, Elias Kiritsis, Francesco Nitti and Lukas T. Witkowski

    We employ gauge-gravity duality to study the backreaction effect of 4-dimensional large- N quantum field theories on constant-curvature backgrounds, and in particular de Sitter space-time. The field theories considered are holographic QFTs, dual to RG flows between UV and IR CFTs. We compute the holographic QFT contribution to the gravitational effective action for 4d Einstein manifold backgrounds

    更新日期:2020-07-16
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