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Evolution of the DM distribution function in the density spikes around PBHs J. Cosmol. Astropart. Phys. (IF 5.3) Pub Date : 2024-08-13 Yu.N. Eroshenko
At the cosmological stage of radiation dominance, dark matter density spikes should form around primordial black holes. In the case when dark matter particles are able to annihilate, the density in the central regions of the spikes decreases due to the elimination of particles, which gives an upper bound on the central density. In this paper, the modification of the central density profile is investigated
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The clustering of Lyman Alpha Emitting galaxies at 𝗓=2–3 J. Cosmol. Astropart. Phys. (IF 5.3) Pub Date : 2024-08-13 Martin White, A. Raichoor, Arjun Dey, Lehman H. Garrison, Eric Gawiser, D. Lang, Kyoung-soo Lee, A.D. Myers, D. Schlegel, F. Valdes, J. Aguilar, S. Ahlen, D. Brooks, E. Chaussidon, T. Claybaugh, K. Dawson, A. de la Macorra, Biprateep Dey, P. Doel, K. Fanning, A. Font-Ribera, J.E. Forero-Romero, S. Gontcho A Gontcho, G. Gutierrez, J. Guy, K. Honscheid, D. Kirkby, A. Kremin, M. Landriau, L. Le Guillou
We measure the clustering of Lyman Alpha Emitting galaxies (LAEs) selected from the One-hundred-square-degree DECam Imaging in Narrowbands (ODIN) survey, with spectroscopic follow-up from Dark Energy Spectroscopic Instrument (DESI). We use DESI spectroscopy to optimize our selection and to constrain the interloper fraction and redshift distribution of our narrow-band selected sources. We select samples
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Weak lensing of strong lensing: beyond the tidal regime J. Cosmol. Astropart. Phys. (IF 5.3) Pub Date : 2024-08-13 Théo Duboscq, Natalie B. Hogg, Pierre Fleury, Julien Larena
The analysis of strong lensing images usually involves an external convergence and shear, which are meant to model the effect of perturbations along the line of sight, on top of the main lens. Such a description of line-of-sight perturbations supposes that the corresponding gravitational fields can be treated in the tidal regime. Going one step further introduces additional effects, known as flexion
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Sliding into DM: determining the local dark matter density and speed distribution using only the local circular speed of the galaxy J. Cosmol. Astropart. Phys. (IF 5.3) Pub Date : 2024-08-13 Patrick G. Staudt, James S. Bullock, Michael Boylan-Kolchin, David Kirkby, Andrew Wetzel, Xiaowei Ou
We use FIRE-2 zoom simulations of Milky Way size disk galaxies to derive easy-to-use relationships between the observed circular speed of the Galaxy at the Solar location, v c, and dark matter properties of relevance for direct detection experiments: the dark matter density, the dark matter velocity dispersion, and the speed distribution of dark matter particles near the Solar location. We find that
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Axion stars: mass functions and constraints J. Cosmol. Astropart. Phys. (IF 5.3) Pub Date : 2024-08-13 Jae Hyeok Chang, Patrick J. Fox, Huangyu Xiao
The QCD axion and axion-like particles, as leading dark matter candidates, can also have interesting implications for dark matter substructures if the Peccei-Quinn symmetry is broken after inflation. In such a scenario, axion perturbations on small scales will lead to the formation of axion miniclusters at matter-radiation equality, and subsequently the formation of axion stars. Such compact objects
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Cosmic shear with small scales: DES-Y3, KiDS-1000 and HSC-DR1 J. Cosmol. Astropart. Phys. (IF 5.3) Pub Date : 2024-08-13 Carlos García-García, Matteo Zennaro, Giovanni Aricò, David Alonso, Raul E. Angulo
We present a cosmological analysis of the combination of the DES-Y3, KiDS-1000 and HSC-DR1 weak lensing samples under a joint harmonic-space pipeline making use of angular scales down to ℓmax=4500, corresponding to significantly smaller scales (δθ ~ 2.4') than those commonly used in cosmological weak lensing studies. We are able to do so by accurately modelling non-linearities and the impact of baryonic
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A hidden population of active galactic nuclei can explain the overabundance of luminous z > 10 objects observed by JWST J. Cosmol. Astropart. Phys. (IF 5.3) Pub Date : 2024-08-13 Sahil Hegde, Michael M. Wyatt, Steven R. Furlanetto
The first wave of observations with JWST has revealed a striking overabundance of luminous galaxies at early times (z > 10) compared to models of galaxies calibrated to pre-JWST data. Early observations have also uncovered a large population of supermassive black holes (SMBHs) at z > 6. Because many of the high-z objects appear extended, the contribution of active galactic nuclei (AGNs) to the total
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CMB spectral distortions from enhanced primordial perturbations: the role of spectator axions J. Cosmol. Astropart. Phys. (IF 5.3) Pub Date : 2024-08-12 Margherita Putti, Nicola Bartolo, Sukannya Bhattacharya, Marco Peloso
Primordial scalar and tensor modes can induce Cosmic Microwave Background spectral distortions during horizon re-entry. We investigate a specific mechanism proposed for this purpose, characterized by the coupling of an SU(2) gauge field to an axion undergoing a momentary stage of rapid evolution during inflation. Examining in details the perturbations produced by this model, we find that spectral distortions
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The renormalization group for large-scale structure: primordial non-Gaussianities J. Cosmol. Astropart. Phys. (IF 5.3) Pub Date : 2024-08-12 Charalampos Nikolis, Henrique Rubira, Fabian Schmidt
The renormalization group for large-scale structure (RG-LSS) describes the evolution of galaxy bias and stochastic parameters as a function of the cutoff Λ. In this work, we introduce interaction vertices that describe primordial non-Gaussianity into the Wilson-Polchinski framework, thereby extending the free theory to the interacting case. The presence of these interactions forces us to include new
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String theory and the first half of the universe J. Cosmol. Astropart. Phys. (IF 5.3) Pub Date : 2024-08-12 Fien Apers, Joseph P. Conlon, Edmund J. Copeland, Martin Mosny, Filippo Revello
We perform a detailed study of stringy moduli-driven cosmologies between the end of inflation and the commencement of the Hot Big Bang, including both the background and cosmological perturbations: a period that can cover half the lifetime of the universe on a logarithmic scale. Compared to the standard cosmology, stringy cosmologies with vacua that address the hierarchy problem motivate extended kination
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Graviton mass due to dark energy as a superconducting medium-theoretical and phenomenological aspects J. Cosmol. Astropart. Phys. (IF 5.3) Pub Date : 2024-08-09 Nader Inan, Ahmed Farag Ali, Kimet Jusufi, Abdelrahman Yasser
It is well known that the cosmological constant term in the Einstein field equations can be interpreted as a stress tensor for dark energy. This stress tensor is formally analogous to an elastic constitutive equation in continuum mechanics. As a result, the cosmological constant leads to a “shear modulus” and “bulk modulus” affecting all gravitational fields in the universe. The form of the constitutive
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Inclusive fluxes of secondary air-shower particles J. Cosmol. Astropart. Phys. (IF 5.3) Pub Date : 2024-08-09 Hariom Sogarwal, Prashant Shukla
The particle showers produced in the atmosphere due to the interactions of primary cosmic particles require a thorough understanding in the backdrop of searches for rare interactions. In this work, we made a comprehensive study of air shower simulations using various combinations of hadronic models and particle transport code of the CORSIKA package. The primary proton and helium distributions are taken
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Resonant reheating J. Cosmol. Astropart. Phys. (IF 5.3) Pub Date : 2024-08-09 Basabendu Barman, Nicolás Bernal, Yong Xu
We investigate a novel reheating scenario proceeding through s-channel inflaton annihilation, mediated by a massive scalar. If the inflaton ϕ oscillates around the minimum of a monomial potential ∝ ϕ n, we reveal the emergence of resonance phenomena originating from the dynamic evolution of the inflaton mass for n>2. Consequently, a resonance appears in both the radiation and the temperature evolution
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Revisiting the concordance ΛCDM model using Gamma-Ray Bursts together with supernovae Ia and Planck data J. Cosmol. Astropart. Phys. (IF 5.3) Pub Date : 2024-08-09 Shahnawaz A. Adil, Maria G. Dainotti, Anjan A. Sen
The Hubble constant, H0, tension is the tension among the local probes, Supernovae Ia, and the Cosmic Microwave Background Radiation. This tension has persisted for decades and continues to puzzle the community. Here, we add intermediate redshift probes, such as Gamma-Ray Bursts (GRB) and Quasars (QS0s), to check if and to what extent these higher redshift probes can reduce this tension. We use the
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A comparative study of cosmological constraints from weak lensing using Convolutional Neural Networks J. Cosmol. Astropart. Phys. (IF 5.3) Pub Date : 2024-08-07 Divij Sharma, Biwei Dai, Uroš Seljak
Weak Lensing (WL) surveys are reaching unprecedented depths, enabling the investigation of very small angular scales. At these scales, nonlinear gravitational effects lead to higher-order correlations making the matter distribution highly non-Gaussian. Extracting this information using traditional statistics has proven difficult, and Machine Learning based summary statistics have emerged as a powerful
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Axions and primordial magnetogenesis: the role of initial axion inhomogeneities J. Cosmol. Astropart. Phys. (IF 5.3) Pub Date : 2024-08-07 Filippo Anzuini, Angelo Maggi
The relic density of dark matter in the ΛCDM model restricts the parameter space for a cosmological axion field, constraining the axion decay constant, the initial amplitude of the axion field and the axion mass. It is shown via lattice simulations how the relic density of axion-like particles with masses close to the one of the QCD axion is affected by axion-gauge field interactions and by initial
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A model-independent tripartite test of cosmic distance relations J. Cosmol. Astropart. Phys. (IF 5.3) Pub Date : 2024-08-06 Isabela Matos, Miguel Quartin, Luca Amendola, Martin Kunz, Riccardo Sturani
Cosmological distances are fundamental observables in cosmology. The luminosity (D L), angular diameter (D A) and gravitational wave (D GW) distances are all trivially related in General Relativity assuming no significant absorption of photons in the extragalactic medium, also known as cosmic opacity. Supernovae have long been the main cosmological standard candle, but bright standard sirens are now
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Affleck-Dine leptogenesis scenario for resonant production of sterile neutrino dark matter J. Cosmol. Astropart. Phys. (IF 5.3) Pub Date : 2024-08-06 Kentaro Kasai, Masahiro Kawasaki, Kai Murai
Sterile neutrino is a fascinating candidate for dark matter. In this paper, we examine the Affleck-Dine (AD) leptogenesis scenario generating a large lepton asymmetry, which can induce the resonant production of sterile neutrino dark matter via the Shi-Fuller (SF) mechanism. We also revisit the numerical calculation of the SF mechanism and the constraints from current X-ray and Lyman-α forest observations
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Emergent particles of de Sitter: thermal interpretation of the stochastic formalism and beyond J. Cosmol. Astropart. Phys. (IF 5.3) Pub Date : 2024-08-06 TaeHun Kim
A thermal interpretation of the stochastic formalism of a slow-rolling scalar field in de Sitter (dS) is given. We construct a correspondence between Hubble patches of dS and particles living in another space called an abstract space. By assuming a dual description of scalar fields and classical mechanics in the abstract space, we show that the stochastic evolution of the infrared part of the field
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Effects of gravitational particle production on Higgs portal dark matter J. Cosmol. Astropart. Phys. (IF 5.3) Pub Date : 2024-08-05 Soichiro Izumine, Kazunori Nakayama
The gravitational interaction is ubiquitous and the effect of gravitational particle production necessarily contributes to the dark matter abundance. A simple candidate of dark matter is a scalar particle, whose only renormalizable interaction is the Higgs portal coupling. We show that the abundance of Higgs portal dark matter is significantly affected by the gravitational production effect. In particular
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Weak lensing constraints on dark matter-baryon interactions with 𝖭-body simulations and machine learning J. Cosmol. Astropart. Phys. (IF 5.3) Pub Date : 2024-08-05 Chi Zhang, Lei Zu, Hou-Zun Chen, Yue-Lin Sming Tsai, Yi-Zhong Fan
We investigate the elastic scattering cross section between dark matter and protons using the DES Year 3 weak lensing data. This scattering induces a dark acoustic oscillation structure in the matter power spectra. To address non-linear effects at low redshift, we utilize principal component analysis alongside a limited set of N-body simulations, improving the reliability of our matter power spectrum
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Displacement versus velocity memory effects from a gravitational plane wave J. Cosmol. Astropart. Phys. (IF 5.3) Pub Date : 2024-08-05 Jibril Ben Achour, Jean-Philippe Uzan
This article demonstrates that additionally to the well-known velocity memory effect, a vacuum gravitational plane wave can also induce a displacement memory on a couple of test particles. A complete classification of the conditions under which a velocity or a displacement memory effect occur is established. These conditions depend both the initial conditions of the relative motion and on the wave
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Non-Gaussianity consistency relations and their consequences for the peaks J. Cosmol. Astropart. Phys. (IF 5.3) Pub Date : 2024-08-05 Mohammad Hossein Namjoo, Bahar Nikbakht
Strong deviations from scale invariance and the appearance of high peaks in the primordial power spectrum have been extensively studied for generating primordial black holes (PBHs) or gravitational waves (GWs). It is also well-known that the effect of non-linearities can be significant in both phenomena. In this paper, we advocate the existence of a general single-field consistency relation that relates
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Search for neutrino emission from GRB 221009A using the KM3NeT ARCA and ORCA detectors J. Cosmol. Astropart. Phys. (IF 5.3) Pub Date : 2024-08-05 S. Aiello, A. Albert, M. Alshamsi, S. Alves Garre, A. Ambrosone, F. Ameli, M. Andre, E. Androutsou, M. Anguita, L. Aphecetche, M. Ardid, S. Ardid, H. Atmani, J. Aublin, F. Badaracco, L. Bailly-Salins, Z. Bardačová, B. Baret, A. Bariego-Quintana, S. Basegmez du Pree, Y. Becherini, M. Bendahman, F. Benfenati, M. Benhassi, D.M. Benoit, E. Berbee, V. Bertin, S. Biagi, M. Boettcher, D. Bonanno, J. Boumaaza
Gamma-ray bursts are promising candidate sources of high-energy astrophysical neutrinos. The recent GRB 221009A event, identified as the brightest gamma-ray burst ever detected, provides a unique opportunity to investigate hadronic emissions involving neutrinos. The KM3NeT undersea neutrino detectors participated in the worldwide follow-up effort triggered by the event, searching for neutrino events
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A method for obtaining cosmological models consistency relations and Gaussian Processes testing J. Cosmol. Astropart. Phys. (IF 5.3) Pub Date : 2024-08-01 J.F. Jesus, A.A. Escobal, R. Valentim, S.H. Pereira
In the present work, we apply consistency relation tests to several cosmological models, including the flat and non-flat ΛCDM models, as well as the flat XCDM model. The analysis uses a non-parametric Gaussian Processes method to reconstruct various cosmological quantities of interest, such as the Hubble parameter H(z) and its derivatives from H(z) data, as well as the comoving distance and its derivatives
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Quadratic perturbations of the Schwarzschild black hole: the algebraically special sector J. Cosmol. Astropart. Phys. (IF 5.3) Pub Date : 2024-07-31 Jibril Ben Achour, Hugo Roussille
We investigate quadratic algebraically special perturbations (ASPs) of the Schwarzschild black hole. Their dynamics are derived from the expansion up to second order in perturbation of the most general algebraically special twisting vacuum solution of general relativity. Following this strategy, we present analytical expressions for the axial-axial, polar-polar and polar-axial source terms entering
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LiteBIRD science goals and forecasts: primordial magnetic fields J. Cosmol. Astropart. Phys. (IF 5.3) Pub Date : 2024-07-31 D. Paoletti, J.A. Rubino-Martin, M. Shiraishi, D. Molinari, J. Chluba, F. Finelli, C. Baccigalupi, J. Errard, A. Gruppuso, A.I. Lonappan, A. Tartari, E. Allys, A. Anand, J. Aumont, M. Ballardini, A.J. Banday, R.B. Barreiro, N. Bartolo, M. Bersanelli, M. Bortolami, T. Brinckmann, E. Calabrese, P. Campeti, A. Carones, F.J. Casas, K. Cheung, L. Clermont, F. Columbro, G. Conenna, A. Coppolecchia, F. Cuttaia
We present detailed forecasts for the constraints on the characteristics of primordial magnetic fields (PMFs) generated prior to recombination that will be obtained with the LiteBIRD satellite. The constraints are driven by some of the main physical effects of PMFs on the CMB anisotropies: the gravitational effects of magnetically-induced perturbations; the effects on the thermal and ionization history
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Cosmic Inflation at the crossroads J. Cosmol. Astropart. Phys. (IF 5.3) Pub Date : 2024-07-31 Jérôme Martin, Christophe Ringeval, Vincent Vennin
The capability of Cosmic Inflation to explain the latest Cosmic Microwave Background and Baryonic Acoustic Oscillation data is assessed by performing Bayesian model comparison within the landscape of nearly three-hundred models of single-field slow-roll inflation. We present the first Bayesian data analysis based on the third-order slow-roll primordial power spectra. In particular, the fourth Hubble-flow
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Constraining ultra slow roll inflation using cosmological datasets J. Cosmol. Astropart. Phys. (IF 5.3) Pub Date : 2024-07-31 H.V. Ragavendra, Anjan Kumar Sarkar, Shiv K. Sethi
In recent years, the detection of gravitational waves by LIGO and PTA collaborations have raised the intriguing possibility of excess matter power at small scales. Such an increase can be achieved by ultra slow roll (USR) phase during inflationary epoch. We constrain excess power over small scales within the framework of such models using cosmological datasets, particularly of CMB anisotropies and
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Quantum geodesics reflecting the internal structure of stars composed of shells J. Cosmol. Astropart. Phys. (IF 5.3) Pub Date : 2024-07-31 Sojeong Cheong, Wontae Kim
In general relativity, an external observer cannot distinguish distinct internal structures between two spherically symmetric stars that have the same total mass M. However, when quantum corrections are taken into account, the external metrics of the stars will receive quantum corrections depending on their internal structures. In this paper, we obtain the quantum-corrected metrics at linear order
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Spectral distortions from acoustic dissipation with non-Gaussian (or not) perturbations J. Cosmol. Astropart. Phys. (IF 5.3) Pub Date : 2024-07-31 Devanshu Sharma, Julien Lesgourgues, Christian T. Byrnes
A well-known route to form primordial black holes in the early universe relies on the existence of unusually large primordial curvature fluctuations, confined to a narrow range of wavelengths that would be too small to be constrained by Cosmic Microwave Background (CMB) anisotropies. This scenario would however boost the generation of μ-type spectral distortions in the CMB due to an enhanced dissipation
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Revisiting primordial black hole capture by neutron stars J. Cosmol. Astropart. Phys. (IF 5.3) Pub Date : 2024-07-31 Roberto Caiozzo, Gianfranco Bertone, Florian Kühnel
A sub-solar mass primordial black hole (PBH) passing through a neutron star, can lose enough energy through interactions with the dense stellar medium to become gravitationally bound to the star. Once captured, the PBH would sink to the core of the neutron star, and completely consume it from the inside. In this paper, we improve previous energy-loss calculations by considering a realistic solution
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A non-perturbative and background-independent formulation of quadratic gravity J. Cosmol. Astropart. Phys. (IF 5.3) Pub Date : 2024-07-31 Alberto Salvio
A non-perturbative and background-independent quantum formulation of quadratic gravity is provided. A canonical quantization procedure introduced in previous works, named after Dirac and Pauli, is here applied to quadratic gravity to obtain, as required by consistency, a well-defined Euclidean path integral. The theory is unitary: all probabilities are non negative and they sum up to one. We obtain
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An implementation of nDGP gravity in Pinocchio J. Cosmol. Astropart. Phys. (IF 5.3) Pub Date : 2024-07-31 Yanling Song, Bin Hu, Cheng-Zong Ruan, Chiara Moretti, Pierluigi Monaco
In this paper we investigate dark matter structure formation in the normal branch of the Dvali-Gabadadze-Porrati (nDGP) model using the PINOCCHIO algorithm. We first present 2nd order Lagrangian perturbation theory for the nDGP model, which shows that the 1st- and 2nd-order growth functions in nDGP are larger than those in ΛCDM. We then examine the dynamics of ellipsoidal collapse in nDGP, which is
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Impact of the magnetic horizon on the interpretation of the Pierre Auger Observatory spectrum and composition data J. Cosmol. Astropart. Phys. (IF 5.3) Pub Date : 2024-07-31 A. Abdul Halim, P. Abreu, M. Aglietta, I. Allekotte, K. Almeida Cheminant, A. Almela, R. Aloisio, J. Alvarez-Muñiz, J. Ammerman Yebra, G.A. Anastasi, L. Anchordoqui, B. Andrada, S. Andringa, L. Apollonio, C. Aramo, P.R. Araújo Ferreira, E. Arnone, J.C. Arteaga Velázquez, P. Assis, G. Avila, E. Avocone, A. Bakalova, F. Barbato, A. Bartz Mocellin, J.A. Bellido, C. Berat, M.E. Bertaina, G. Bhatta, M.
The flux of ultra-high energy cosmic rays reaching Earth above the ankle energy (5 EeV) can be described as a mixture of nuclei injected by extragalactic sources with very hard spectra and a low rigidity cutoff. Extragalactic magnetic fields existing between the Earth and the closest sources can affect the observed CR spectrum by reducing the flux of low-rigidity particles reaching Earth. We perform
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Generalised conditions for rapid-turn inflation J. Cosmol. Astropart. Phys. (IF 5.3) Pub Date : 2024-07-30 Raúl Wolters, Oksana Iarygina, Ana Achúcarro
Rapid-turn slow-roll inflationary trajectories have been shown to be an attractor in two-field models, provided the turn rate is near constant and larger than the slow-roll parameters. These trajectories can produce primordial spectra consistent with current observations on CMB scales. We present the generalized consistency condition for sustained rapid-turn inflationary trajectory with two fields
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The anomaly of the CMB power with the latest Planck data J. Cosmol. Astropart. Phys. (IF 5.3) Pub Date : 2024-07-30 M. Billi, R.B. Barreiro, E. Martínez-González
The lack of power anomaly is an unexpected feature observed at large angular scales in the maps of Cosmic Microwave Background (CMB) produced by the COBE, WMAP and Planck satellites. This signature, which consists in a missing of power with respect to that predicted by the ΛCDM model, might hint at a new cosmological phase before the standard inflationary era. The main point of this paper is taking
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Spinning Proca-Higgs balls, stars and hairy black holes J. Cosmol. Astropart. Phys. (IF 5.3) Pub Date : 2024-07-30 Carlos Herdeiro, Eugen Radu, Etevaldo dos Santos Costa Filho
Recently, spherical and static flat space solitons (balls) and self-gravitating, everywhere regular, asymptotically flat solitons (stars) were constructed in an Einstein-Proca-Higgs model [1], where a complex vector field gains mass by coupling to a real scalar field with a Higgs-type potential. The Proca-Higgs model serves as a UV completion of a complex Proca model with self-interactions. Here, we
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Reparametrization invariant action for gravity with dynamical determinant of metric J. Cosmol. Astropart. Phys. (IF 5.3) Pub Date : 2024-07-30 J. Klusoň
We present manifestly reparametrization invariant action for theory of gravity with dynamical determinant of metric. We show that it is similar to a reparametrization invariant action for unimodular gravity. We determine canonical form of the action and study structure of constraints.
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The hierarchical cosmic web and assembly bias J. Cosmol. Astropart. Phys. (IF 5.3) Pub Date : 2024-07-30 J.M. Coloma-Nadal, F.-S. Kitaura, J.E. García-Farieta, F. Sinigaglia, G. Favole, D. Forero Sánchez
Accurate modeling of galaxy distributions is paramount for cosmological analysis using galaxy redshift surveys. However, this endeavor is often hindered by the computational complexity of resolving the dark matter halos that host these galaxies. To address this challenge, we propose the development of effective assembly bias models down to small scales, i.e., going beyond the local density dependence
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A diffused background from axion-like particles in the microwave sky J. Cosmol. Astropart. Phys. (IF 5.3) Pub Date : 2024-07-30 Harsh Mehta, Suvodip Mukherjee
The nature of dark matter is an unsolved cosmological problem and axions are one of the weakly interacting cold dark matter candidates. Axions or ALPs (Axion-like particles) are pseudo-scalar bosons predicted by beyond-standard model theories. The weak coupling of ALPs with photons leads to the conversion of CMB photons to ALPs in the presence of a transverse magnetic field. If they have the same mass
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CLASS-OneLoop: accurate and unbiased inference from spectroscopic galaxy surveys J. Cosmol. Astropart. Phys. (IF 5.3) Pub Date : 2024-07-29 Dennis Linde, Azadeh Moradinezhad Dizgah, Christian Radermacher, Santiago Casas, Julien Lesgourgues
The power spectrum is the most commonly applied summary statistics to extract cosmological information from the observed three-dimensional distribution of galaxies in spectroscopic surveys. We present CLASS-OneLoop, a new numerical tool, fully integrated into the Boltzmann code CLASS, enabling the calculation of the one-loop power spectrum of biased tracers in spectroscopic surveys. Built upon the
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Accretion onto oscillating cosmic string loops J. Cosmol. Astropart. Phys. (IF 5.3) Pub Date : 2024-07-29 Hao Jiao, Bryce Cyr, Robert Brandenberger
Cosmic string loops are non-linear density fluctuations which form in the early universe and could play an important role in explaining many phenomena which are in tension with the standard ΛCDM model. Hence, the accretion process onto cosmic string loops should be studied in detail. Most previous works view loops as point masses and ignore the impact of a finite loop size. In this work, we utilize
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Searching for QPOs in BATSE short gamma-ray bursts based on narrowband and broadband features J. Cosmol. Astropart. Phys. (IF 5.3) Pub Date : 2024-07-29 Dong-Jie Liu, Yuan-Chuan Zou
Gamma-ray bursts (GRBs), especially short GRBs, are often considered potential candidates for exhibiting kilohertz quasi-periodic oscillations (QPOs) due to their origin from binary mergers. It has already been discovered that two bursts exhibit QPOs. While systematic searches for QPOs in GRBs typically concentrate on the kilohertz range, there has been no comprehensive exploration in the hundred-hertz
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Observational test of ℛ2 spacetimes with the S2 star in the Milky Way galactic center J. Cosmol. Astropart. Phys. (IF 5.3) Pub Date : 2024-07-29 Jian-Ming Yan, Tao Zhu, Mustapha Azreg-Aïnou, Mubasher Jamil, Hoang Ky Nguyen
A novel class of vacuum metrics expressible in analytical form was recently found for pure ℛ2 gravity, based on a groundwork put forth by Buchdahl in 1962. These Buchdahl-inspired solutions offer a practical framework for testing ℛ2 gravity through empirical observations. Within a subclass of asymptotically flat Buchdahl-inspired vacuum spacetimes, we identified a parameter ϵ measuring the deviation
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Negative cosmological constant in the dark energy sector: tests from JWST photometric and spectroscopic observations of high-redshift galaxies J. Cosmol. Astropart. Phys. (IF 5.3) Pub Date : 2024-07-29 Nicola Menci, Shahnawaz A. Adil, Upala Mukhopadhyay, Anjan A. Sen, Sunny Vagnozzi
Early observations with the James Webb Space Telescope (JWST) have revealed the existence of an unexpectedly large abundance of extremely massive galaxies at redshifts z ≳ 5: these are in tension with the predictions not only of the standard ΛCDM cosmology, but also with those of a wide class of dynamical dark energy (DE) models, and are generally in better agreement with models characterized by a
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Modular invariant hilltop inflation J. Cosmol. Astropart. Phys. (IF 5.3) Pub Date : 2024-07-29 Stephen F. King, Xin Wang
In this paper we show that it is possible to achieve successful hilltop inflation in which the inflaton is identified as the modulus field in a modular invariant theory. The dilaton plays a crucial role in shaping the potential. Modular invariant gaugino condensation provides the mechanism for the modulus stabilisation after inflation. The inflationary trajectory lies on the lower boundary of the fundamental
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Study of mass outflow rates from magnetized advective accretion disk around rotating black holes J. Cosmol. Astropart. Phys. (IF 5.3) Pub Date : 2024-07-29 Camelia Jana, Santabrata Das
We develop and discuss a model formalism to study the properties of mass outflows that are emerged out from a relativistic, magnetized, viscous, advective accretion flow around a rotating black hole. In doing so, we consider the toroidal component as the dominant magnetic fields and synchrotron process is the dominant cooling mechanism inside the accretion disk. With this, we self-consistently solve
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Enhanced curvature perturbation and primordial black hole formation in two-stage inflation with a break J. Cosmol. Astropart. Phys. (IF 5.3) Pub Date : 2024-07-29 Xinpeng Wang, Ying-li Zhang, Misao Sasaki
We investigate a model of R2-gravity with a non-minimally coupled scalar field that gives rise to two-stage inflation with a break, that is, with an intermediate stage where inflation momentarily halts. We find that the power spectrum of the primordial curvature perturbation is significantly enhanced at the break scale, which can account for the primordial black hole (PBH) formation, without affecting
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Smoothing and flattening the universe through slow contraction versus inflation J. Cosmol. Astropart. Phys. (IF 5.3) Pub Date : 2024-07-29 Anna Ijjas, Paul J. Steinhardt, David Garfinkle, William G. Cook
In a systematic study, we use an equivalent pair of improved numerical relativity codes based on a tetrad-formulation of the classical Einstein-scalar field equations to examine whether slow contraction or inflation (or both) can resolve the homogeneity, isotropy and flatness problems. Our finding, based on a set of gauge/frame invariant diagnostics and the models considered, is that slow contraction
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Modelling the star-formation activity and ionizing properties of high-redshift galaxies J. Cosmol. Astropart. Phys. (IF 5.3) Pub Date : 2024-07-29 Anirban Chakraborty, Tirthankar Roy Choudhury
Early results from the JWST observations have reported a surprisingly high number of UV-bright galaxies at z ≥ 10, which appears to challenge the theoretical predictions from standard galaxy formation models in the ΛCDM framework at these redshifts. To alleviate this tension, several cosmological and astrophysical interpretations have been advanced. However, all of these proposed scenarios carry noteworthy
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Constraints on cosmic-ray boosted dark matter with realistic cross section J. Cosmol. Astropart. Phys. (IF 5.3) Pub Date : 2024-07-29 Atanu Guha, Jong-Chul Park
Sub-MeV cold dark-matter particles are unable to produce electronic recoil in conventional dark-matter direct detection experiments such as XENONnT and LUX-ZEPLIN above the detector threshold. The mechanism of boosted dark matter comes into picture to constrain the parameter space of such low mass dark matter from direct detection experiments. We consider the effect of the leading components of cosmic
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Primordial black hole sterile neutrinogenesis: sterile neutrino dark matter production independent of couplings J. Cosmol. Astropart. Phys. (IF 5.3) Pub Date : 2024-07-25 Muping Chen, Graciela B. Gelmini, Philip Lu, Volodymyr Takhistov
Sterile neutrinos (ν s s) are well-motivated and actively searched for hypothetical neutral particles that would mix with the Standard Model active neutrinos. They are considered prime warm dark matter (DM) candidates, typically when their mass is in the keV range, although they can also be hot or cold DM components. We discuss in detail the characteristics and phenomenology of ν s s that minimally
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Cosmic microwave background constraints on extended dark matter objects J. Cosmol. Astropart. Phys. (IF 5.3) Pub Date : 2024-07-25 Djuna Croon, Sergio Sevillano Muñoz
Primordially formed extended dark objects would accrete baryonic matter and impact the ionisation history of the Universe. Insisting on consistency with the anisotropies of the cosmic microwave background, we derive constraints on the dark matter fraction for various classes of objects, of different sizes. We introduce a novel scaling technique to speed up numerical calculations and release our calculation
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Lyapunov exponents and phase structure of Lifshitz and hyperscaling violating black holes J. Cosmol. Astropart. Phys. (IF 5.3) Pub Date : 2024-07-25 A. Naveena Kumara, Shreyas Punacha, Md Sabir Ali
We study the phase structure of Lifshitz and hyperscaling violating (HSV) black holes using Lyapunov exponents. For describing hyperscaling violating system, we chose a particular gravity model constructed from generalized Einstein-Maxwell-Dilaton action which includes the Lifshitz cases at appropriate limits. We study the relationship between Lyapunov exponents and black hole phase transitions considering
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Possible signatures of higher dimension in thin accretion disk around brane world black hole J. Cosmol. Astropart. Phys. (IF 5.3) Pub Date : 2024-07-25 Ailin Liu, Tong-Yu He, Ming Liu, Zhan-Wen Han, Rong-Jia Yang
We probe deeply into the characteristics of thin accretion disk surrounding black hole within the brane world paradigm. We investigate how model parameters affect the physical properties of the disk. Our findings indicate that as the tidal charge parameter inherited from the higher dimension increases, the energy flux, the radiation temperature, the spectral cutoff frequency, the spectral luminosity
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Precession and split of tilted, geometrically thin accretion disk: an analytical study J. Cosmol. Astropart. Phys. (IF 5.3) Pub Date : 2024-07-25 Ye Shen, Bin Chen
It has been observed that many relativistic jets display a kind of cork-screw-like precession. Numerical simulations has suggested that such kind of precession may originate from the precession of the disk. In this work, we introduce an analytical model to describe the precession and split of a tilted, geometrically thin disk. We consider the Lense-Thirring effect from the central (primary) black hole
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Gravitational wave sourced by decay of massive particle from primordial black hole evaporation J. Cosmol. Astropart. Phys. (IF 5.3) Pub Date : 2024-07-25 Ki-Young Choi, Erdenebulgan Lkhagvadorj, Satyabrata Mahapatra
In this article, we investigate the stochastic gravitational waves (GWs) spectrum, resulting from the emission of gravitons through bremsstrahlung, in the decay of particles produced by Hawking radiation. Although particle decays inevitably entail the emission of graviton due to bremsstrahlung, the associated decay width is notably suppressed due to the Planck scale suppression in the coupling of matter
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Characterization of atmosphere-skimming cosmic-ray showers in high-altitude experiments J. Cosmol. Astropart. Phys. (IF 5.3) Pub Date : 2024-07-25 Matías Tueros, Sergio Cabana-Freire, Jaime Alvarez-Muñiz
Atmosphere-skimming showers are initiated by cosmic rays with incoming directions such that the full development of the cascade occurs inside the atmosphere without ever reaching the ground. This new class of showers has been observed in balloon-borne experiments such as ANITA, but a characterisation of their properties is lacking. The interplay between the Earth's magnetic field, the long distances
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Applying simulation-based inference to spectral and spatial information from the Galactic Center gamma-ray excess J. Cosmol. Astropart. Phys. (IF 5.3) Pub Date : 2024-07-25 Katharena Christy, Eric J. Baxter, Jason Kumar
The two most favored explanations of the Fermi Galactic Center gamma-ray excess (GCE) are millisecond pulsars and self annihilation of the smooth dark matter halo of the galaxy. In order to distinguish between these possibilities, we would like to optimally use all information in the available data, including photon direction and energy information. To date, analyses of the GCE have generally treated