
显示样式: 排序: IF: - GO 导出
-
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
-
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
-
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
-
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
-
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
-
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
-
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
-
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
-
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
-
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
-
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
-
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
-
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
-
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
-
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
-
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
-
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
-
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
-
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
-
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
-
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
-
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
-
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
-
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
-
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
-
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
-
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
-
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
-
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
-
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
-
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
-
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
-
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
-
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
-
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
-
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
-
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
-
Observability of dark matter substructure with pulsar timing correlations J. Cosmol. Astropart. Phys. (IF 5.21) Pub Date : 2020-12-17 Harikrishnan Ramani, Tanner Trickle and Kathryn M. Zurek
Dark matter substructure on small scales is currently weakly constrained, and its study may shed light on the nature of the dark matter. In this work we study the gravitational effects of dark matter substructure on measured pulsar phases in pulsar timing arrays (PTAs). Due to the stability of pulse phases observed over several years, dark matter substructure around the Earth-pulsar system can imprint
-
Parameterised post-Newtonian formalism for the effective field theory of dark energy via screened reconstructed Horndeski theories J. Cosmol. Astropart. Phys. (IF 5.21) Pub Date : 2020-12-17 Cyril Renevey, Joe Kennedy and Lucas Lombriser
We bring together two popular formalisms which generically parameterise deviations from General Relativity on astrophysical and cosmological scales, namely the parameterised post-Newtonian (PPN) formalism and the effective field theory (EFT) of dark energy and modified gravity. These separate formalisms are successfully applied to independently perform tests of gravity in their respective regimes of
-
On the impact of galaxy bias uncertainties on primordial non-Gaussianity constraints J. Cosmol. Astropart. Phys. (IF 5.21) Pub Date : 2020-12-17 Alexandre Barreira
We study the impact that uncertainties on assumed relations between galaxy bias parameters have on constraints of the local PNG f NL parameter. We focus on the relation between the linear density galaxy bias b 1 and local PNG bias b ##IMG## [https://ej.iop.org/icons/Entities/phi.gif] {phi} in an idealized forecast setup with multitracer galaxy power spectrum and bispectrum data. We consider two parametrizations
-
Sterile neutrino self-interactions: H 0 tension and short-baseline anomalies J. Cosmol. Astropart. Phys. (IF 5.21) Pub Date : 2020-12-16 Maria Archidiacono, Stefano Gariazzo, Carlo Giunti, Steen Hannestad and Thomas Tram
Sterile neutrinos with a mass in the eV range have been invoked as a possible explanation of a variety of short baseline (SBL) neutrino oscillation anomalies. However, if one considers neutrino oscillations between active and sterile neutrinos, such neutrinos would have been fully thermalised in the early universe, and would be therefore in strong conflict with cosmological bounds. In this study we
-
A heatwave affair: mixed Higgs- R 2 preheating on the lattice J. Cosmol. Astropart. Phys. (IF 5.21) Pub Date : 2020-12-15 Fedor Bezrukov and Chris Shepherd
We use a semiclassical lattice approach to perform the first nonlinear study of preheating in R 2 -healed Higgs inflation, in the " R 2 -like" regime where the curvature-squared coupling β and nonminimal coupling ξ of the Higgs field contribute similarly to the CMB scalar perturbations. Preheating occurs first through tachyonic production of Higgs bosons, and later scattering off the homogeneous inflaton
-
On a possible cosmological evolution of galaxy cluster Y X − Y SZE scaling relation J. Cosmol. Astropart. Phys. (IF 5.21) Pub Date : 2020-12-15 R.F.L. Holanda and W.J.C. da Silva
An important result from self-similar models that describe the process of galaxy cluster formation is the simple scaling relation Y SZE D A 2 / C XSZE Y X= C . In this ratio, Y SZE is the integrated Sunyaev-Zel'dovich effect flux of a cluster, its x-ray counterpart is Y X , C XSZE and C are constants and D A is the angular diameter distance to the cluster. In this paper, we consider the cosmic distance
-
On chromonatural inflation in string theory J. Cosmol. Astropart. Phys. (IF 5.21) Pub Date : 2020-12-14 Jonathan Holland, Ivonne Zavala and Gianmassimo Tasinato
Sourced gravitational waves in chromonatural inflation (CNI) can give rise to a chiral spectrum of tensor fluctuations that is considerably enhanced relative to the vacuum fluctuations. If the field content of CNI acts purely as a spectator (SCNI), the inflationary sector can be consistent with current data making SCNI very appealing in view of future observations. We investigate the prospects of embedding
-
Explanation for why the early universe was stable and dominated by the standard model J. Cosmol. Astropart. Phys. (IF 5.21) Pub Date : 2020-12-14 Mark P. Hertzberg and Mudit Jain
The Standard Model (SM) possesses an instability at high scales that would be catastrophic during or just after inflation, and yet no new physics has been seen to alter this. Furthermore, modern developments in quantum gravity suggest that the SM degrees of freedom are not unique; that a typical low energy effective theory should include a large assortment of hidden sector degrees of freedom. It is
-
Common origin of warm dark matter and dark radiation J. Cosmol. Astropart. Phys. (IF 5.21) Pub Date : 2020-12-14 Manuel A. Buen-Abad, Raymond T. Co and Keisuke Harigaya
We consider a cosmological scenario where a relativistic particle and a stable massive particle are simultaneously produced from the decay of a late-decaying particle after Big-Bang Nucleosynthesis but before matter-radiation equality. The relativistic and massive particles behave as dark radiation and warm dark matter, respectively. Due to a common origin, the warmness and abundances are closely related
-
Precision cosmology with voids in the final BOSS data J. Cosmol. Astropart. Phys. (IF 5.21) Pub Date : 2020-12-11 Nico Hamaus, Alice Pisani, Jin-Ah Choi, Guilhem Lavaux, Benjamin D. Wandelt and Jochen Weller
We report novel cosmological constraints obtained from cosmic voids in the final BOSS DR12 dataset. They arise from the joint analysis of geometric and dynamic distortions of average void shapes (i.e., the stacked void-galaxy cross-correlation function) in redshift space. Our model uses tomographic deprojection to infer real-space void profiles and self-consistently accounts for the Alcock-Paczynski
-
On the fast random sampling and other properties of the three point correlation function in galaxy surveys J. Cosmol. Astropart. Phys. (IF 5.21) Pub Date : 2020-12-10 Fidel Sosa Nuñez and Gustavo Niz
In the forthcoming large volume galaxy surveys, the use of higher order statistics will prove important to obtain complementary information to the usual two point statistics. In particular, one of those higher order statistical tools is the Three Point Correlation Function (3PCF) over discrete data points, whose lowest variance estimators count triangle configurations with vertices mixing data and
-
Flavor ratios of astrophysical neutrinos interacting with stochastic gravitational waves having arbitrary spectra J. Cosmol. Astropart. Phys. (IF 5.21) Pub Date : 2020-12-10 Maxim Dvornikov
We study the evolution and oscillations of fixed massive neutrinos interacting with stochastic gravitational waves (GWs). The energy spectrum of these GWs is Gaussian, with the correlator of the amplitudes being arbitrary. We derive the equation for the density matrix for flavor neutrinos in this case. In the two flavors approximation, this equation can be solved analytically. We find the numerical
-
Constraints on the distance duality relation with standard sirens J. Cosmol. Astropart. Phys. (IF 5.21) Pub Date : 2020-12-09 N.B. Hogg, M. Martinelli and S. Nesseris
We use gravitational wave (GW) standard sirens, in addition to Type Ia supernovae (SNIa) and baryon acoustic oscillation (BAO) mock data, to forecast constraints on the electromagnetic and gravitational distance duality relations (DDR) . We make use of a parameterised approach based on a specific DDR violation model, along with a machine learning reconstruction method based on the Genetic Algorithms
-
Focusing conditions for extended teleparallel gravity theories J. Cosmol. Astropart. Phys. (IF 5.21) Pub Date : 2020-12-09 U.K. Beckering Vinckers, Á. de la Cruz-Dombriz and F.J. Maldonado Torralba
In the context of extended theories of teleparallel gravity f ( T ) we derive the focusing conditions for a one-parameter dependent congruence of timelike auto-parallels of the Levi-Civita connection. We also consider the f ( T ) field equations for a general metric tensor before moving on to consider a spatially flat Robertson-Walker space-time. Following this, we study the expansion rate for a one-parameter
-
Cannibalism hinders growth: Cannibal Dark Matter and the S 8 tension J. Cosmol. Astropart. Phys. (IF 5.21) Pub Date : 2020-12-07 Stefan Heimersheim, Nils Schöneberg, Deanna C. Hooper and Julien Lesgourgues
Many models of dark matter have been proposed in attempt to ease the S 8 tension between weak lensing and CMB experiments. One such exciting possibility is cannibalistic dark matter (CanDM), which has exothermal number-changing interactions allowing it to stay warm far into its non-relativistic regime. Here we investigate the cosmological implications of CanDM and how it impacts CMB anisotropies and
-
On mass distribution of coalescing black holes J. Cosmol. Astropart. Phys. (IF 5.21) Pub Date : 2020-12-07 A.D. Dolgov, A.G. Kuranov, N.A. Mitichkin, S. Porey, K.A. Postnov, O.S. Sazhina and I.V. Simkin
Available data on the chirp mass distribution of the coalescing black hole binaries in O1-O3 LIGO/Virgo runs are analyzed and compared statistically with the distribution calculated under the assumption that these black holes are primordial with a log-normal mass spectrum. The theoretically calculated chirp mass distribution with the inferred best acceptable mass spectrum parameters, M 0 =17 M ⊙ and
-
Current constraints on deviations from General Relativity using binning in redshift and scale J. Cosmol. Astropart. Phys. (IF 5.21) Pub Date : 2020-12-07 Cristhian Garcia-Quintero, Mustapha Ishak and Orion Ning
We constrain deviations from general relativity (GR) including both redshift and scale dependencies in the modified gravity (MG) parameters. In particular, we employ the under-used binning approach and compare the results to functional forms. We use available datasets such as Cosmic Microwave Background (CMB) from Planck 2018, Baryonic Acoustic Oscillations (BAO) and Redshift Space Distortions (BAO/RSD)
-
Taking measurements of the kinematic Sunyaev-Zel'dovich effect forward : including uncertainties from velocity reconstruction with forward modeling J. Cosmol. Astropart. Phys. (IF 5.21) Pub Date : 2020-12-04 Nhat-Minh Nguyen, Jens Jasche, Guilhem Lavaux and Fabian Schmidt
We measure the kinematic Sunyaev-Zel'dovich (kSZ) effect, imprinted by maxBCG clusters, on the Planck SMICA map of the Cosmic Microwave Background (CMB). Our measurement, for the first time, directly accounts for uncertainties in the velocity reconstruction step through the process of Bayesian forward modeling. We show that this often neglected uncertainty budget typically increases the final uncertainty
-
Neutrino decoupling including flavour oscillations and primordial nucleosynthesis J. Cosmol. Astropart. Phys. (IF 5.21) Pub Date : 2020-12-04 Julien Froustey, Cyril Pitrou and Maria Cristina Volpe
We revisit the decoupling of neutrinos in the early universe with flavour oscillations. We rederive the quantum kinetic equations which determine the neutrino evolution based on a BBGKY-like hierarchy, and include for the first time the full collision term, with both on- and off-diagonal terms for all relevant reactions. We focus on the case of zero chemical potential and solve these equations numerically
-
Inelastic Dark Matter and the SABRE experiment J. Cosmol. Astropart. Phys. (IF 5.21) Pub Date : 2020-12-04 Madeleine J. Zurowski, Elisabetta Barberio and Giorgio Busoni
We present here the sensitivity of the SABRE (Sodium iodide with Active Background REjection) experiment to benchmark proton-philic, spin dependent, Inelastic Dark Matter models previously proposed due to their lowered tension with existing experimental results. We perform fits to cross section, mass, and mass splitting values to find the best fit to DAMA/LIBRA data for these models. In this analysis
-
Galaxy bias and primordial non-Gaussianity: insights from galaxy formation simulations with IllustrisTNG J. Cosmol. Astropart. Phys. (IF 5.21) Pub Date : 2020-12-04 Alexandre Barreira, Giovanni Cabass, Fabian Schmidt, Annalisa Pillepich and Dylan Nelson
We study the impact that large-scale perturbations of (i) the matter density and (ii) the primordial gravitational potential with local primordial non-Gaussianity (PNG) have on galaxy formation using the IllustrisTNG model. We focus on the linear galaxy bias b 1 and the coefficient b ##IMG## [https://ej.iop.org/icons/Entities/phi.gif] {phi} of the scale-dependent bias induced by PNG, which describe
-
Testing emergent gravity with isolated dwarf galaxies J. Cosmol. Astropart. Phys. (IF 5.21) Pub Date : 2020-12-04 Kris Pardo
Verlinde (2016) has proposed a new modified theory of gravity, Emergent Gravity (EG), as an alternative to dark matter. EG reproduces the Tully-Fisher relationship with no free parameters and agrees with the velocity curves of most massive, spiral galaxies well. In its current form, the theory only applies to isolated, spherically symmetric systems in a dark energy-dominated Universe, and thus can
-
Gravitational waves from inflation with antisymmetric tensor field J. Cosmol. Astropart. Phys. (IF 5.21) Pub Date : 2020-12-03 Sandeep Aashish, Abhilash Padhy and Sukanta Panda
We build upon the past studies of inflation with rank-2 antisymmetric tensor field, including here the tensor perturbations to metric. We perform a comprehensive analysis of the background dynamics of our model in the presence of non-minimal coupling curvature terms R and R μ ν . We find appropriate conditions on the nonminimal coupling parameters to satisfy the constraint of speed of propagation of