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Spectral distortion signatures of step-like inflationary potential J. Cosmol. Astropart. Phys. (IF 6.4) Pub Date : 2024-05-13 Jorge Mastache, Wilson Barrera and Raúl Henríquez-Ortiz
In this work, we analyze a power-law inflationary potential enhanced with a step that can introduce features in the primordial power spectrum. We focus on the computation of the Spectral Distortions (SD) induced by these features obtained from the inflationary dynamics. In this scenario, we explore the potential of upcoming experimental missions like PIXIE to detect the SD of the model within a power
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Quantum gravity effects on fermionic dark matter and gravitational waves J. Cosmol. Astropart. Phys. (IF 6.4) Pub Date : 2024-05-13 Stephen F. King, Rishav Roshan, Xin Wang, Graham White and Masahito Yamazaki
We explore the phenomenological consequences of breaking discrete global symmetries in quantum gravity (QG). We extend a previous scenario where discrete global symmetries are responsible for scalar dark matter (DM) and domain walls (DWs), to the case of fermionic DM, considered as a feebly interacting massive particle, which achieves the correct DM relic density via the freeze-in mechanism. Due to
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Rescuing gravitational-reheating in chaotic inflation J. Cosmol. Astropart. Phys. (IF 6.4) Pub Date : 2024-05-13 Basabendu Barman, Nicolás Bernal and Javier Rubio
We show, within the single-field inflationary paradigm, that a linear non-minimal interaction ξ M P ϕ R between the inflaton field ϕ and the Ricci scalar R can result in successful inflation that concludes with an efficient heating of the Universe via perturbative decays of the inflaton, aided entirely by gravity. Considering the inflaton field to oscillate in a quadratic potential, we find that 𝒪(10-1)
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Gravitational radiation from eccentric binary black hole system in dynamical Chern-Simons gravity J. Cosmol. Astropart. Phys. (IF 6.4) Pub Date : 2024-05-13 Zhao Li, Jin Qiao, Tan Liu, Rui Niu, Shaoqi Hou, Tao Zhu and Wen Zhao
Dynamical Chern-Simons (DCS) gravity, a typical parity-violating gravitational theory, modifies both the generation and propagation of gravitational waves from general relativity (GR). In this work, we derive the gravitational waveform radiated from a binary slowly-rotating black hole system with eccentric orbits under the spin-aligned assumption in the DCS theory. Compared with GR, DCS modification
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Hamiltonian for Weyl transverse gravity J. Cosmol. Astropart. Phys. (IF 6.4) Pub Date : 2024-05-13 J. Klusoň
In this short note we determine Hamiltonian for Weyl transverse gravity. We find primary, secondary and tertiary constraints and calculate Poisson brackets between them. We also show that gauge fixing in Weyl transverse gravity leads to the Hamiltonian for unimodular gravity.
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How robust are gravitational wave predictions from cosmological phase transitions? J. Cosmol. Astropart. Phys. (IF 6.4) Pub Date : 2024-05-13 Peter Athron, Lachlan Morris and Zhongxiu Xu
Gravitational wave (GW) predictions of cosmological phase transitions are almost invariably evaluated at either the nucleation or percolation temperature. We investigate the effect of the transition temperature choice on GW predictions, for phase transitions with weak, intermediate and strong supercooling. We find that the peak amplitude of the GW signal varies by a factor of a few for weakly supercooled
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A Minkowski functional analysis of the Cosmic Microwave Background weak lensing convergence J. Cosmol. Astropart. Phys. (IF 6.4) Pub Date : 2024-05-13 Jan Hamann and Yuqi Kang
Minkowski functionals are summary statistics that capture the geometric and morphological properties of fields. They are sensitive to all higher order correlations of the fields and can be used to complement more conventional statistics, such as the power spectrum of the field. We develop a Minkowski functional-based approach for a full likelihood analysis of mildly non-Gaussian sky maps with partial
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Mock data sets for the Eboss and DESI Lyman-α forest surveys J. Cosmol. Astropart. Phys. (IF 6.4) Pub Date : 2024-05-13 Thomas Etourneau, Jean-Marc Le Goff, James Rich, Ting Tan, Andrei Cuceu, S. Ahlen, E. Armengaud, D. Brooks, T. Claybaugh, A. de la Macorra, P. Doel, A. Font-Ribera, J.E. Forero-Romero, S.Gontcho A. Gontcho, A.X. Gonzalez-Morales, H.K. Herrera-Alcantar, K. Honscheid, T. Kisner, M. Landriau, M. Manera, P. Martini, R. Miquel, A. Muñoz-Gutiérrez, J. Nie, I. Pérez-Ràfols, C. Poppett, C. Ravoux, M. Rezaie
We present a publicly-available code to generate sets of mock Lyman-α (Lyα) forest data that have realistic large-scale correlations including those due to the Baryonic Acoustic Oscillations (BAO). The primary purpose of these mocks is to test the analysis procedures of the Extended Baryon Oscillation Survey (eBOSS) and the Dark Energy Spectroscopy Instrument (DESI) surveys. The transmitted flux fraction
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Scaling solutions as Early Dark Energy resolutions to the Hubble tension J. Cosmol. Astropart. Phys. (IF 6.4) Pub Date : 2024-05-13 Edmund J. Copeland, Adam Moss, Sergio Sevillano Muñoz and Jade M.M. White
A wide class of scalar field models including Quintessence and K-essence have the attractive property of tracker regimes, where the energy density stored in the field evolves so as to mimic that of the dominant background component. During this evolution, for a brief period of time, there is an increase in the energy density of the field as it spirals in towards its attractor solution. We show that
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Wide binaries and modified gravity (MOG) J. Cosmol. Astropart. Phys. (IF 6.4) Pub Date : 2024-05-13 J.W. Moffat
Wide binary stars are used to test the modified gravity called Scalar-Tensor-Vector Gravity or MOG. This theory is based on the additional gravitational degrees of freedom, the scalar field G = GN(1+α), where GN is Newton's constant, and the massive (spin-1 graviton) vector field ϕμ. The wide binaries have separations of 2–30 kAU. The MOG acceleration law, derived from the MOG field equations and equations
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A self-similar model of galaxy formation and dark halo relaxation J. Cosmol. Astropart. Phys. (IF 6.4) Pub Date : 2024-05-13 Premvijay Velmani and Aseem Paranjape
We develop a spherical self-similar model for the formation of a galaxy through gas collapsing in an isolated self-gravitating dark matter halo. As is well known, the self-similarity assumption makes the problem eminently tractable by reducing it to a system of ordinary differential equations. We improve upon the existing literature on self-similar collapse in two ways. First, we include the effects
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LiteBIRD and CMB-S4 sensitivities to reheating in plateau models of inflation J. Cosmol. Astropart. Phys. (IF 6.4) Pub Date : 2024-05-13 Marco Drewes, Lei Ming and Isabel Oldengott
We study the sensitivity of LiteBIRD and CMB-S4 to the reheating temperature and the inflaton coupling in three types of plateau-potential models of inflation, namely mutated hilltop inflation, radion gauge inflation, and α-attractor T models. We first find relations between model parameters and CMB observables in all models. We then perform Monte Carlo Markov Chain based forecasts to quantify the
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Constraints on non-Gaussian primordial curvature perturbation from the LIGO-Virgo-KAGRA third observing run J. Cosmol. Astropart. Phys. (IF 6.4) Pub Date : 2024-05-13 Ryoto Inui, Santiago Jaraba, Sachiko Kuroyanagi and Shuichiro Yokoyama
The scalar-induced gravitational wave (SIGWs), arising from large amplitude primordial density fluctuations, provide a unique observational test for directly probing the epoch of inflation. In this work, we provide constraints on the SIGW background by taking into account the non-Gaussianity in the primordial density fluctuations, using the first three observing runs (O1-O3) data of the LIGO-Virgo-KAGRA
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Suppression of matter density growth at scales exceeding the cosmic screening length J. Cosmol. Astropart. Phys. (IF 6.4) Pub Date : 2024-05-13 M. Eingorn, E. Yilmaz, A.E. Yükselci and A. Zhuk
One of the main objectives of modern cosmology is to explain the origin and evolution of cosmic structures at different scales. The principal force responsible for the formation of such structures is gravity. In a general relativistic framework, we have shown that matter density contrasts do not grow over time at scales exceeding the cosmic screening length, which corresponds to a cosmological scale
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The BOSS bispectrum analysis at one loop from the Effective Field Theory of Large-Scale Structure J. Cosmol. Astropart. Phys. (IF 6.4) Pub Date : 2024-05-12 Guido D'Amico, Yaniv Donath, Matthew Lewandowski, Leonardo Senatore and Pierre Zhang
We analyze the BOSS power spectrum monopole and quadrupole, and the bispectrum monopole and quadrupole data, using the predictions from the Effective Field Theory of Large-Scale Structure (EFTofLSS). Specifically, we use the one loop prediction for the power spectrum and the bispectrum monopole, and the tree level for the bispectrum quadrupole. After validating our pipeline against numerical simulations
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Weak-scale Higgs inflation J. Cosmol. Astropart. Phys. (IF 6.4) Pub Date : 2024-05-12 Wen Yin
The present measurement of the Standard Model (SM) parameters suggests that the Higgs effective potential has a maximum at the Higgs field value of approximately 1011GeV, and the electroweak (EW) vacuum is not absolutely stable. To achieve absolute EW stability, a very large Higgs-Ricci scalar non-minimal coupling can be introduced. I study cosmic inflation driven by the Higgs field in this extension
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Forecast constraints on the baryonic feedback effect from the future kinetic Sunyaev-Zel'dovich effect detection J. Cosmol. Astropart. Phys. (IF 6.4) Pub Date : 2024-05-12 Yi Zheng and Pengjie Zhang
The baryonic feedback effect is an important systematic error in the weak lensing (WL) analysis. It contributes partly to the S8 tension in the literature. With the next generations of large scale structure (LSS) and CMB experiments, the high signal-to-noise kinetic Sunyaev-Zel'dovich (kSZ) effect detection can tightly constrain the baryon distribution in and around dark matter halos, and quantify
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Fluctuation-dissipation relation in cosmic microwave background J. Cosmol. Astropart. Phys. (IF 6.4) Pub Date : 2024-05-12 Atsuhisa Ota
We study the fluctuation-dissipation relation for sound waves in the cosmic microwave background (CMB), employing effective field theory (EFT) for fluctuating hydrodynamics. Treating sound waves as the linear response to thermal radiation, we establish the fluctuation-dissipation relation within a cosmological framework. While dissipation is elucidated in established linear cosmological perturbation
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EFTofLSS meets simulation-based inference: σ 8 from biased tracers J. Cosmol. Astropart. Phys. (IF 6.4) Pub Date : 2024-05-12 Beatriz Tucci and Fabian Schmidt
Cosmological inferences typically rely on explicit expressions for the likelihood and covariance of the data vector, which normally consists of a set of summary statistics. However, in the case of nonlinear large-scale structure, exact expressions for either likelihood or covariance are unknown, and even approximate expressions can become very cumbersome, depending on the scales and summary statistics
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Are f(R, Matter) theories really relevant to cosmology? J. Cosmol. Astropart. Phys. (IF 6.4) Pub Date : 2024-05-12 Osmin Lacombe, Shinji Mukohyama and Josef Seitz
We examine f(R, Matter) theories that directly couple the curvature R or Rμν with the matter sector in the action, in addition to the universal coupling. We argue that if the matter sector includes the Standard Model (SM), such theories are either inconsistent or already excluded by experiments unless they are a rewriting of f(R) gravity or general relativity. If these theories genuinely couple the
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Hunting WIMPs with LISA: correlating dark matter and gravitational wave signals J. Cosmol. Astropart. Phys. (IF 6.4) Pub Date : 2024-05-12 Torsten Bringmann, Tomás E. Gonzalo, Felix Kahlhoefer, Jonas Matuszak and Carlo Tasillo
The thermal freeze-out mechanism in its classical form is tightly connected to physics beyond the Standard Model around the electroweak scale, which has been the target of enormous experimental efforts. In this work we study a dark matter model in which freeze-out is triggered by a strong first-order phase transition in a dark sector, and show that this phase transition must also happen close to the
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Axionic defects in the CMB: birefringence and gravitational waves J. Cosmol. Astropart. Phys. (IF 6.4) Pub Date : 2024-05-12 Ricardo Z. Ferreira, Silvia Gasparotto, Takashi Hiramatsu, Ippei Obata and Oriol Pujolàs
The evidence for a non-vanishing isotropic cosmic birefringence in recent analyses of the CMB data provides a tantalizing hint for new physics. Domain wall (DW) networks have recently been shown to generate an isotropic birefringence signal in the ballpark of the measured value when coupled to photons. In this work, we explore the axionic defects hypothesis in more detail and extending previous results
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Gamma-ray spectra of the Crab, Vela and Geminga pulsars fitted with SED of the emission from their current sheet J. Cosmol. Astropart. Phys. (IF 6.4) Pub Date : 2024-05-12 Houshang Ardavan
We show that the spectral energy distribution (SED) of the tightly focused radiation generated by the superluminally moving current sheet in the magnetosphere of a non-aligned neutron star fits the gamma-ray spectra of the Crab, Vela and Geminga pulsars over the entire range of photon energies so far detected by Fermi-LAT, MAGIC and HESS from them: over 102 MeV to 20 TeV. While emblematic of any emission
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Calibration requirement for Epoch of Reionization 21-cm signal observation. Part III. Bias and variance in uGMRT ELAIS-N1 field power spectrum J. Cosmol. Astropart. Phys. (IF 6.4) Pub Date : 2024-05-12 Saikat Gayen, Rashmi Sagar, Sarvesh Mangla, Prasun Dutta, Nirupam Roy, Arnab Chakraborty, Jais Kumar, Abhirup Datta and Samir Choudhuri
Power spectrum of H i 21-cm radiation is one of the promising probes to study large scale structure of the universe and understand galaxy formation and evolution. The presence of foregrounds, that are orders of magnitude larger in the same frequency range of the redshifted 21-cm signal has been one of the largest observational challenges. The foreground contamination also hinders the calibration procedures
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Probing Gauss-Bonnet-corrected inflation with gravitational waves J. Cosmol. Astropart. Phys. (IF 6.4) Pub Date : 2024-05-12 Kamil Mudrunka and Kazunori Nakayama
The low energy effective action of quantum gravity may include the higher curvature terms such as the Gauss-Bonnet term. The inflaton dynamics may be affected by the Gauss-Bonnet term if there is an inflaton-Gauss-Bonnet coupling. We show that an inflation model with a simple power law potential is made viable if it is coupled to the Gauss-Bonnet term since the prediction on the scalar spectral index
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The star formation, dust, and abundance of galaxies with unWISE-CIB cross-correlations J. Cosmol. Astropart. Phys. (IF 6.4) Pub Date : 2024-05-10 Ziang Yan, Abhishek S. Maniyar, Ludovic van Waerbeke
The cosmic infrared background (CIB) is the accumulated infrared (IR) radiation mainly from interstellar dust heated up by early stars. In this work, we measure the cross-correlation between galaxies from the unWISE catalog and the CIB maps from the Planck satellite to simultaneously constrain the cosmic star formation rate (SFR), dust spectral energy distribution (SED), and the halo occupation distribution (HOD)
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Influence of plasma on the optical appearance of spinning black hole in Kalb-Ramond gravity and its Existence around M87* and Sgr A* J. Cosmol. Astropart. Phys. (IF 6.4) Pub Date : 2024-05-09 Muhammad Ali Raza, M. Zubair, Eiman Maqsood
The visible universe is filled with different types of plasma media in the form of stars, nebulas and other forms of excited gases. These matter fields have a high influence on the gravity and are likely to be present around the black holes due to the immense gravitational attraction. Since a plasma medium affects the speed of light, therefore we investigated the null geodesics and various optical
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Geodesic structure, shadow and optical appearance of black hole immersed in Chaplygin-like dark fluid J. Cosmol. Astropart. Phys. (IF 6.4) Pub Date : 2024-05-09 Xiang-Qian Li, Hao-Peng Yan, Xiao-Jun Yue, Shi-Wei Zhou, Qiang Xu
In this study, we focus on a black hole immersed in a cosmological Chaplygin-like dark fluid (CDF), characterized by the equation of state p = -B/ρ and an additional parameter q influencing the energy density of the fluid. We investigate the geodesic structure, shadow, and optical appearance of such a black hole. Through analysis on the effective potential and the epicyclic frequencies, it is found
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Simulation-based inference of deep fields: galaxy population model and redshift distributions J. Cosmol. Astropart. Phys. (IF 6.4) Pub Date : 2024-05-09 Beatrice Moser, Tomasz Kacprzak, Silvan Fischbacher, Alexandre Refregier, Dominic Grimm, Luca Tortorelli
Accurate redshift calibration is required to obtain unbiased cosmological information from large-scale galaxy surveys. In a forward modelling approach, the redshift distribution n(z) of a galaxy sample is measured using a parametric galaxy population model constrained by observations. We use a model that captures the redshift evolution of the galaxy luminosity functions, colours, and morphology, for
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Imprints of light dark matter on the evolution of cosmic neutrinos J. Cosmol. Astropart. Phys. (IF 6.4) Pub Date : 2024-05-09 Isaac R. Wang, Xun-Jie Xu
Neutrinos are often considered as a portal to new physics beyond the Standard Model (SM) and might possess phenomenologically interesting interactions with dark matter (DM). This paper examines the cosmological imprints of DM that interacts with and is produced from SM neutrinos at temperatures below the MeV scale. We take a model-independent approach to compute the evolution of DM in this framework
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Inverse Gertsenshtein effect as a probe of high-frequency gravitational waves J. Cosmol. Astropart. Phys. (IF 6.4) Pub Date : 2024-05-09 Yutong He, Sambit K. Giri, Ramkishor Sharma, Salome Mtchedlidze, Ivelin Georgiev
We apply the inverse Gertsenshtein effect, i.e., the graviton-photon conversion in the presence of a magnetic field, to constrain high-frequency gravitational waves (HFGWs). Using existing astrophysical measurements, we compute upper limits on the GW energy densities ΩGW at 16 different frequency bands. Given the observed magnetisation of galaxy clusters with field strength B ∼ μG correlated on 𝒪(10)
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Pulsar timing anomalies: a window into baryon number violation J. Cosmol. Astropart. Phys. (IF 6.4) Pub Date : 2024-05-09 Mohammadreza Zakeri
We investigate the influence of a specific class of slow Baryon Number Violation (BNV)—one that induces quasi-equilibrium evolution — on pulsar spin characteristics. This work reveals how BNV can potentially alter observable parameters, including spin-down rates, the second derivative of spin frequency, and braking indices of pulsars. Moreover, we demonstrate that BNV could lead to anomalies in pulsar
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The separate-universe approach and sudden transitions during inflation J. Cosmol. Astropart. Phys. (IF 6.4) Pub Date : 2024-05-09 Joseph H.P. Jackson, Hooshyar Assadullahi, Andrew D. Gow, Kazuya Koyama, Vincent Vennin, David Wands
The separate-universe approach gives an intuitive way to understand the evolution of cosmological perturbations in the long-wavelength limit. It uses solutions of the spatially-homogeneous equations of motion to model the evolution of the inhomogeneous universe on large scales. We show that the separate-universe approach fails on a finite range of super-Hubble scales at a sudden transition from slow
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The imitation game reloaded: effective shadows of dynamically robust spinning Proca stars J. Cosmol. Astropart. Phys. (IF 6.4) Pub Date : 2024-05-09 Ivo Sengo, Pedro V.P. Cunha, Carlos A.R. Herdeiro, Eugen Radu
We analyse the lensing images by dynamically robust rotating (mini-)Proca stars surrounded by thin accretion disks. Due to their peculiar geodesic structure we show that these images exhibit striking similarities with the ones of BHs, for appropriately chosen disk intensity profile, when imposing a GRMHD-motivated emission cut off. Additionally, and unlike the non-rotating case, these similarities
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Particle content of very inclined air showers for radio signal modeling J. Cosmol. Astropart. Phys. (IF 6.4) Pub Date : 2024-05-09 Marion Guelfand, Simon Chiche, Kumiko Kotera, Simon Prunet, Tanguy Pierog
The reconstruction of very inclined air showers is a new challenge for next-generation radio experiments such as the AugerPrime radio upgrade, BEACON, and GRAND, which focus on the detection of ultra high energy particles. To tackle this, we study the electromagnetic particle content of very inclined air showers, which has scarcely been studied so far. Using the simulation tools CORSIKA and CoREAS
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Resonant spin-flavor precession of sterile neutrinos J. Cosmol. Astropart. Phys. (IF 6.4) Pub Date : 2024-05-09 Edward Wang
We analyze the impact of resonant conversions mediated by non-vanishing magnetic moments between active neutrinos and a heavy sterile neutrino on the supernova neutrino flux. We present the level-crossing scheme for such a scenario and derive the neutrino fluxes after conversion, paying particular attention to the order in which the resonances occur. We then compute the expected event rates from the
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Neutron stars in scalar torsion theories with non minimal coupling J. Cosmol. Astropart. Phys. (IF 6.4) Pub Date : 2024-05-09 Youcef Kehal, Khireddine Nouicer, Hamza Boumaza
We explore the existence and configurations of static and slowly rotating neutron stars (NSs) within a specific truncation of teleparallel scalar torsion theory. In this model, a scalar field ϕ is non-minimally coupled to the torsion scalar as ξTϕ 2, in the presence of the scalar potential V(ϕ) = -μ 2 ϕ 2/2 + λϕ 4/4. We establish the hydrostatic equilibrium equations for the static scenario and numerically
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Anatomy of astrophysical echoes from axion dark matter J. Cosmol. Astropart. Phys. (IF 6.4) Pub Date : 2024-05-08 Elisa Todarello, Francesca Calore, Marco Regis
If the dark matter in the Universe is made of μeV axion-like particles (ALPs), then a rich phenomenology can emerge in connection to their stimulated decay into two photons. We discuss the ALP stimulated decay induced by electromagnetic radiation from Galactic radio sources. Three signatures, made by two echoes and one collinear emission, are associated with the decay, and can be simultaneously detected
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One consistency relation for all single-field inflationary models J. Cosmol. Astropart. Phys. (IF 6.4) Pub Date : 2024-05-08 Mohammad Hossein Namjoo
In this paper, we present a non-Gaussianity consistency relation that enables the calculation of the squeezed limit bispectrum of the curvature perturbation in single-field inflationary models by carefully inspecting the background evolution and the linear perturbation theory. The consistency relation is more general than others in the literature since it does not require any specific symmetry, conservation
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The price of abandoning dark matter is nonlocality J. Cosmol. Astropart. Phys. (IF 6.4) Pub Date : 2024-05-08 C. Deffayet, R.P. Woodard
We consider the classic question posed by Pardo and Spergel about the price of abandoning dark matter in the context of an invariant, metric-based theory of gravity. Our answer is that the price is nonlocality. This has been known for some time in the context of the quasi-static regime. We show that it also applies for cosmology and we exhibit a model which reproduces standard CDM successes such as
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Robust bounds on ALP dark matter from dwarf spheroidal galaxies in the optical MUSE-Faint survey J. Cosmol. Astropart. Phys. (IF 6.4) Pub Date : 2024-05-08 Elisa Todarello, Marco Regis, Javier Reynoso-Cordova, Marco Taoso, Daniel Vaz, Jarle Brinchmann, Matthias Steinmetz, Sebastiaan L. Zoutendijk
Nearby dwarf spheroidal galaxies are ideal targets in the search for indirect dark matter (DM) signals. In this work, we analyze MUSE spectroscopic observations of a sample of five galaxies, composed of both classical and ultra-faint dwarf spheroidals. The goal is to search for radiative decays of axion-like particles (ALPs) in the mass range of 2.7–5.3 eV. After taking into account the uncertainties
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The electric charge of black holes within galaxies J. Cosmol. Astropart. Phys. (IF 6.4) Pub Date : 2024-05-08 Nelson D. Padilla, Ignacio J. Araya, Federico Stasyszyn
We present improved estimates of the electric charge that black holes could hold when these are embedded in the ionised plasma within galaxies. We have implemented the spontaneous emission of charges of opposite sign to that of the black hole via athermal Hawking evaporation, including its dependence on black hole spin, and we have estimated the equilibrium charge that arises as this charge loss is
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Unifying inflationary and reheating solution J. Cosmol. Astropart. Phys. (IF 6.4) Pub Date : 2024-05-08 Manjeet Kaur, Debottam Nandi, Sharath Raghavan B
The conventional background solution for the evolution of a single canonical inflaton field performs admirably in extreme scenarios such as the slow-roll phase (where the slow-roll parameter is much less than one) and the deep reheating era (where the Hubble parameter is much smaller than the effective mass of the potential and the field oscillates around the minimum of the potential), but fails to
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Loop contributions to the scalar power spectrum due to quartic order action in ultra slow roll inflation J. Cosmol. Astropart. Phys. (IF 6.4) Pub Date : 2024-05-08 Suvashis Maity, H.V. Ragavendra, Shiv K. Sethi, L. Sriramkumar
The investigation of the theory of inflation beyond the linear order in perturbations is important both for theoretical consistency and potential observables. In the contemporary literature, the calculation of modifications to the inflationary scalar power spectrum due to the loops from the higher order interaction terms in the Hamiltonian have led to an interesting discussion regarding the validity
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Constraints on peculiar velocity distribution of binary black holes using gravitational waves with GWTC-3 J. Cosmol. Astropart. Phys. (IF 6.4) Pub Date : 2024-05-03 Zhi-Qiang You, Zu-Cheng Chen, Lang Liu, Zhu Yi, Xiao-Jin Liu, You Wu, Yi Gong
Peculiar velocity encodes rich information about the formation, dynamics, evolution, and merging history of binary black holes. In this work, we employ a hierarchical Bayesian model to infer the peculiar velocity distribution of binary black holes. We use the data from GWTC-3 and assume a Maxwell-Boltzmann distribution for the peculiar velocities, but do not consider the dependence of peculiar velocity
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Imaging thick accretion disks and jets surrounding black holes J. Cosmol. Astropart. Phys. (IF 6.4) Pub Date : 2024-05-03 Zhenyu Zhang, Yehui Hou, Minyong Guo, Bin Chen
Based on the horizon-scale magnetofluid model developed in [1], we investigate the millimeter-wave images of a geometrically thick accretion disk or a funnel wall, i.e., the magnetofluid that encloses the base of the jet region, around a Kerr black hole. By employing the numerical method to solve the null geodesic and radiative transfer equations, we obtain the optical appearances at various observational
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Coupled quintessence scalar field model in light of observational datasets J. Cosmol. Astropart. Phys. (IF 6.4) Pub Date : 2024-05-03 Trupti Patil, Ruchika, Sukanta Panda
We do a detailed analysis of a well-theoretically motivated interacting dark energy scalar field model with a time-varying interaction term. Using current cosmological datasets from CMB, BAO, Type Ia Supernova, H(z) measurements from cosmic chronometers, angular diameter measurements from Megamasers, growth measurements, and local SH0ES measurements, we found that dark energy component may act differently
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Planck constraints on cosmic birefringence and its cross-correlation with the CMB J. Cosmol. Astropart. Phys. (IF 6.4) Pub Date : 2024-05-03 G. Zagatti, M. Bortolami, A. Gruppuso, P. Natoli, L. Pagano, G. Fabbian
Cosmic birefringence is the in-vacuo, frequency independent rotation of the polarization plane of linearly polarized radiation, induced by a parity-violating term in the electromagnetic Lagrangian. We implement a harmonic estimator for the birefringence field that only relies on the CMB E to B mode cross-correlation, thus suppressing the effect of cosmic variance from the temperature field. We derive
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Using axion miniclusters to disentangle the axion-photon coupling and the dark matter density J. Cosmol. Astropart. Phys. (IF 6.4) Pub Date : 2024-05-03 Virgile Dandoy, Joerg Jaeckel, Valentina Montoya
Dark matter direct (and indirect) detection experiments usually can only determine a specific combination of a power of the coupling and the dark matter density. This is also true for axion haloscopes which are sensitive to the product g 2 aγγρ DM, the combination of axion-photon coupling squared and the dark matter density. In this note we show, that in the lucky case when we intersect with a so-called
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Notes on emergent conformal symmetry for black holes J. Cosmol. Astropart. Phys. (IF 6.4) Pub Date : 2024-05-03 Yesheng Xue, Jie Jiang, Ming Zhang
We examine the motion of the massless scalar field and nearly bound null geodesics in the near-ring region of a black hole, which may possess either acceleration or a gravitomagnetic mass. Around such black holes, the photon ring deviates from the equatorial plane. In the large angular momentum limit, we demonstrate that the massless scalar field exhibits an emergent conformal symmetry in this near-ring
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Symmetry breaking due to multi-angle matter-neutrino resonance in neutron star merger remnants J. Cosmol. Astropart. Phys. (IF 6.4) Pub Date : 2024-05-03 Ian Padilla-Gay, Shashank Shalgar, Irene Tamborra
Neutron star merger remnants are unique sites for exploring neutrino flavor conversion in dense media. Because of the natural excess of ν̅e over νe , the neutrino-neutrino potential can cancel the matter potential, giving rise to matter-neutrino resonant flavor conversion. Under the assumption of two (anti)neutrino flavors and spatial homogeneity, we solve the neutrino quantum kinetic equations to
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Effective action approach for preheating J. Cosmol. Astropart. Phys. (IF 6.4) Pub Date : 2024-05-03 Bin Xu, Wei Xue
We present a semiclassical non-perturbative approach for calculating the preheating process at the end of inflation. Our method involves integrating out the decayed particles within the path integral framework and subsequently determining world-line instanton solutions in the effective action. This enables us to obtain the effective action of the inflaton, with its imaginary part linked to the phenomenon
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Entangled states as a probe of early universe history: a Higgs case study J. Cosmol. Astropart. Phys. (IF 6.4) Pub Date : 2024-05-03 Rose Baunach
I explore whether distinguishing features of phase transitions and/or the inflationary energy scale can be imprinted on cosmological observables due to entanglement during inflation, given a spectator scalar field with a Higgs-like potential. As a consequence of this analysis, I also present results that illustrate the variety of features a Higgs-like spectator can imprint on the primordial power spectrum
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Hyperhydrodynamics: relativistic viscous fluids from hypermomentum J. Cosmol. Astropart. Phys. (IF 6.4) Pub Date : 2024-05-02 Damianos Iosifidis, Tomi S. Koivisto
We explore a new action formulation of hyperfluids, fluids with intrinsic hypermomentum. Brown's Lagrangian for a relativistic perfect fluid is generalised by incorporating the degrees of freedom encoded in the hypermomentum tensor, namely by including connection-matter couplings. Quite interestingly, generic hyperfluids are imperfect, since hypermomentum induces such effects as bulk and shear viscosities
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The Sun and core-collapse supernovae are leading probes of the neutrino lifetime J. Cosmol. Astropart. Phys. (IF 6.4) Pub Date : 2024-05-02 Pablo Martínez-Miravé, Irene Tamborra, Mariam Tórtola
The large distances travelled by neutrinos emitted from the Sun and core-collapse supernovae together with the characteristic energy of such neutrinos provide ideal conditions to probe their lifetime, when the decay products evade detection. We investigate the prospects of probing invisible neutrino decay capitalising on the detection of solar and supernova neutrinos as well as the diffuse supernova
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Gravitational redshift constraints on the effective theory of interacting dark energy J. Cosmol. Astropart. Phys. (IF 6.4) Pub Date : 2024-05-02 Sveva Castello, Michele Mancarella, Nastassia Grimm, Daniel Sobral-Blanco, Isaac Tutusaus, Camille Bonvin
Upcoming galaxy surveys provide the necessary sensitivity to measure gravitational redshift, a general relativistic effect that generates a dipole in galaxy clustering data when correlating two distinct populations of galaxies. Here, we study the constraining power of gravitational redshift within the framework of the effective theory of interacting dark energy. This formalism describes linear cosmological
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Broken blue-tilted inflationary gravitational waves: a joint analysis of NANOGrav 15-year and BICEP/Keck 2018 data J. Cosmol. Astropart. Phys. (IF 6.4) Pub Date : 2024-05-02 Jun-Qian Jiang, Yong Cai, Gen Ye, Yun-Song Piao
Recently, the pulsar timing array (PTA) collaborations have reported the evidence for a stochastic gravitational wave background (SGWB) at nano-Hertz band. The spectrum of inflationary gravitational wave (IGW) is unknown, which might exhibit different power law at different frequency-bands, thus if the PTA signal is primordial, it will be significant to explore the underlying implications of current
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Analytical insights into constant-roll condition: extending the paradigm to non-canonical models J. Cosmol. Astropart. Phys. (IF 6.4) Pub Date : 2024-05-02 S. Mohammad Ahmadi, Nahid Ahmadi, Mehdi Shokri
In this work, we explore the prospect of generalizing the constant-roll condition in canonical inflationary model to non-canonical models. To find a natural generalization, we focus on three manifestations of this condition and construct constant-roll models corresponding to each manifestation. These models are not equivalent but reduce to the familiar constant-roll model in canonical limit. To showcase
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Foreground removal with ILC methods for AliCPT-1 J. Cosmol. Astropart. Phys. (IF 6.4) Pub Date : 2024-05-02 Jiazheng Dou, Shamik Ghosh, Larissa Santos, Wen Zhao
One of the main goals of most future CMB experiments is the precise measurement of CMB B-mode polarization, whose major obstacle is the Galactic foregrounds. In this paper, we evaluate the foreground cleaning performance of the variants of the ILC method on partial sky B-modes and analyze the main sources of biases on the BB power spectrum. Specially, we compare the NILC, the cILC (in three domains)
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Shadow images of compact objects in beyond Horndeski theory J. Cosmol. Astropart. Phys. (IF 6.4) Pub Date : 2024-05-02 Hyat Huang, Jutta Kunz, Deeshani Mitra
A beyond Horndeski theory is considered that admits wormholes, black holes and naked singularities. In this theory the shadow images of the black holes and the exotic compact objects (ECOs), illuminated by an optically and geometrically thin disk, are investigated. The results show that the three kinds of objects cast unlike shadow images, in particular, because the different objects possess a different