Journal of Cosmology and Astroparticle Physics最新文献

Black holes in a gravitational field: the non-linear static love number of Schwarzschild black holes vanishes 引力场中的黑洞：史瓦西黑洞的非线性静态爱数消失

IF 6.4 2区物理与天体物理

Journal of Cosmology and Astroparticle Physics Pub Date : 2025-05-15 DOI: 10.1088/1475-7516/2025/05/039

A. Kehagias and A. Riotto

引用次数: 0

Constraining the curvature-induced quantum gravity scales via gamma-ray bursts 通过伽马射线暴约束曲率诱导的量子引力尺度

IF 6.4 2区物理与天体物理

Journal of Cosmology and Astroparticle Physics Pub Date : 2025-05-15 DOI: 10.1088/1475-7516/2025/05/041

D.D. Ofengeim and T. Piran

{"title":"Constraining the curvature-induced quantum gravity scales via gamma-ray bursts","authors":"D.D. Ofengeim and T. Piran","doi":"10.1088/1475-7516/2025/05/041","DOIUrl":"https://doi.org/10.1088/1475-7516/2025/05/041","url":null,"abstract":"We constrain the parameters that govern curvature-induced quantum gravity time-of-flight (TOF) effects. These TOF delays, which occur due to modified dispersion relations of particles in the vacuum, could be a phenomenological signature of quantum gravity. Gamma-ray bursts (GRBs), short, high-energy events from distant galaxies, offer a unique opportunity to impose observational limits on TOF delays and, by extension, on the energy scales of quantum gravity. Using the standard Jacob-Piran relation, which assumes a locally-flat spacetime, the analysis of quantum gravity-induced TOF effects establishes a lower limit of approximately 10 EPl on the energy scale of these effects. However, curvature-induced quantum gravity effects may introduce additional contributions. From current GRB observations, we find that, at a 95% credibility level, in the symmetry-deformed scenario, curvature-induced TOF effects may only arise at energies above 0.04 EPl. If we consider only curvature-induced effects, this limit is an order of magnitude stronger. Observing more GRBs at different redshifts could improve the constraints on the curvature-induced QG phenomena. However, given the capabilities of current telescopes and the current understanding of GRBs, it is unlikely that these constraints will be significantly extended beyond the present level.","PeriodicalId":15445,"journal":{"name":"Journal of Cosmology and Astroparticle Physics","volume":"130 1","pages":""},"PeriodicalIF":6.4,"publicationDate":"2025-05-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144066463","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Entropy evolution towards DARKexp of IllustrisTNG dark matter halos 暗物质晕的熵演化

IF 6.4 2区物理与天体物理

Journal of Cosmology and Astroparticle Physics Pub Date : 2025-05-15 DOI: 10.1088/1475-7516/2025/05/043

A. Francis, L.L.R. Williams and J. Hjorth

{"title":"Entropy evolution towards DARKexp of IllustrisTNG dark matter halos","authors":"A. Francis, L.L.R. Williams and J. Hjorth","doi":"10.1088/1475-7516/2025/05/043","DOIUrl":"https://doi.org/10.1088/1475-7516/2025/05/043","url":null,"abstract":"Dark matter (DM) halos simulated via N-body techniques are known to exhibit nearly universal profiles at equilibrium; however, their origin remains uncertain despite thorough investigation. This work aims to probe the origin of simulated DM halo structure by testing DARKexp, a first-principles approach that describes the maximum entropy state of collisionless, self-gravitating systems in equilibrium via their energy distributions, and proposes an entropy functional that is expected to increase during evolution. We fit the DARKexp energy distribution to a set of massive equilibrium halos from the cosmological simulation IllustrisTNG. For the first time, we calculate the entropy of these halos as a function of cosmological time by tracking halos that are in equilibrium at z = 0.0, to z = 3.0 and calculating their entropy at various epochs between. We find that DARKexp provides an excellent fit to the energy distributions of equilibrium DM halos and that such halos exhibit an overall increase in entropy during evolution. Our results indicate that DM halos evolve to become their maximum entropy state at equilibrium and that this state is described by DARKexp.","PeriodicalId":15445,"journal":{"name":"Journal of Cosmology and Astroparticle Physics","volume":"6 1","pages":""},"PeriodicalIF":6.4,"publicationDate":"2025-05-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144066465","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

DESI forecast for dark matter-neutrino interactions using EFTofLSS 利用EFTofLSS对暗物质-中微子相互作用进行DESI预测

IF 6.4 2区物理与天体物理

Journal of Cosmology and Astroparticle Physics Pub Date : 2025-05-15 DOI: 10.1088/1475-7516/2025/05/040

Markus R. Mosbech, Santiago Casas, Julien Lesgourgues, Dennis Linde, Azadeh Moradinezhad Dizgah, Christian Radermacher and Jannik Truong

引用次数: 0

Radiation exposure from the dark 暴露在黑暗中的辐射

IF 6.4 2区物理与天体物理

Journal of Cosmology and Astroparticle Physics Pub Date : 2025-05-15 DOI: 10.1088/1475-7516/2025/05/042

Florian Niedermann and Martin S. Sloth

{"title":"Radiation exposure from the dark","authors":"Florian Niedermann and Martin S. Sloth","doi":"10.1088/1475-7516/2025/05/042","DOIUrl":"https://doi.org/10.1088/1475-7516/2025/05/042","url":null,"abstract":"We explore the possibility that exotic forms of dark matter could expose humans on Earth or on prolonged space travel to a significant radiation dose. The radiation exposure from dark matter interacting with nuclei in the human body is generally assumed to be negligible compared to other sources of background radiation. However, as we discuss here, current data allow for dark matter models where this is not necessarily true. In particular, if dark matter is heavier and more strongly interacting than weakly interacting massive particle dark matter, it could act as ionizing radiation and deposit a significant amount of radiation energy in all or part of the human population, similar to or even exceeding the known radiation exposure from other background sources. Conversely, the non-observation of such an exposure can be used to constrain this type of heavier and more strongly interacting dark matter. We first consider the case where dark matter scatters elastically and identify the relevant parameter space in a model-independent way. We also discuss how previous bounds from cosmological probes, as well as atmospheric and space-based detectors, might be avoided, and how a re-analysis of existing radiation data, along with a simple experiment monitoring ionizing radiation in space with a lower detection threshold, could help constrain part of this parameter space. We finally propose a hypothetical dark matter candidate that scatters inelastically and argue that, in principle, one per mille of the Earth's population could attain a significant radiation dose from such a dark matter exposure in their lifetime.","PeriodicalId":15445,"journal":{"name":"Journal of Cosmology and Astroparticle Physics","volume":"4 1","pages":""},"PeriodicalIF":6.4,"publicationDate":"2025-05-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144066464","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Revisiting van Citter-Zernike correlations in the presence of primordial gravitational waves 重访原始引力波存在下的范·西特-泽尼克相关性

IF 6.4 2区物理与天体物理

Journal of Cosmology and Astroparticle Physics Pub Date : 2025-05-13 DOI: 10.1088/1475-7516/2025/05/032

F. Shojaei Arani, M. Bagheri Harouni, Brahim Lamine and Alain Blanchard

{"title":"Revisiting van Citter-Zernike correlations in the presence of primordial gravitational waves","authors":"F. Shojaei Arani, M. Bagheri Harouni, Brahim Lamine and Alain Blanchard","doi":"10.1088/1475-7516/2025/05/032","DOIUrl":"https://doi.org/10.1088/1475-7516/2025/05/032","url":null,"abstract":"In this paper, we develop a quantum field theory framework to describe the interaction between a gravitational wave (GW) background and an electromagnetic (EM) field emitted from a distant celestial source, such as a star. We demonstrate that a background of primordial gravitational waves (PGWs), as predicted by the inflationary scenario, induces a loss of spatial coherence in the EM field as it propagates over cosmological distances. This effect leads to the degradation of van Cittert-Zernike correlations, ultimately rendering them unobservable — a phenomenon referred to as blurring. Since spatial coherence is observed in very long baseline interferometry (VLBI) measurements of distant quasars, this places constraints on the amplitude of the PGW background. We quantitatively evaluate the blurring effect caused by PGWs in a two-mode squeezed state, which represents the standard quantum state predicted by the simplest inflationary models. However, due to the weak coupling between GWs and the EM field, we find that the induced incoherence is too small to be detected in current VLBI observations.","PeriodicalId":15445,"journal":{"name":"Journal of Cosmology and Astroparticle Physics","volume":"114 1","pages":""},"PeriodicalIF":6.4,"publicationDate":"2025-05-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143945819","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Detection prospects for the GW background of galactic (sub)solar mass primordial black holes 银河系（次）太阳质量原始黑洞的GW背景探测前景

IF 6.4 2区物理与天体物理

Journal of Cosmology and Astroparticle Physics Pub Date : 2025-05-13 DOI: 10.1088/1475-7516/2025/05/036

Frans van Die, Ivan Rapoport, Yonadav Barry Ginat and Vincent Desjacques

{"title":"Detection prospects for the GW background of galactic (sub)solar mass primordial black holes","authors":"Frans van Die, Ivan Rapoport, Yonadav Barry Ginat and Vincent Desjacques","doi":"10.1088/1475-7516/2025/05/036","DOIUrl":"https://doi.org/10.1088/1475-7516/2025/05/036","url":null,"abstract":"In multi-component dark matter models, a fraction fpbh of the dark matter could be in the form of primordial black holes (PBHs) with (sub)solar masses. Some would have formed binaries that presently trace the Milky Way halo of particle dark matter. We explore the gravitational wave (GW) signal produced by such a hypothetical population of Galactic PBH binaries and assess its detectability by the LISA experiment. For this purpose, we model the formation and evolution of early-type PBH binaries accounting for GW hardening and binary disruption in the Milky Way. Our analysis reveals that the present-day Galactic population of PBH binaries is characterized by very high orbital eccentricities |1-e| ≪ 1. For a PBH mass Mpbh ∼ 0.1 - 1M⊙, this yields a GW background that peaks in the millihertz frequency range where the LISA instrumental noise is minimum. While this signal remains below the LISA detection threshold for viable fpbh ≲ 0.01, future GW observatories such as DECIGO and BBO could detect it if 0.01 ≲ Mpbh ≲ 0.1M⊙. Furthermore, we anticipate that, after 5 years of observations, LISA should be able to detect 𝒪(100) (resp. 𝒪(1)) loud Galactic PBH binaries of mass Mpbh ≲ 0.1 - 1M⊙ with a SNR ≥ 5 if fpbh = 0.01 (resp. fpbh = 0.001). Nonlinear effects not considered here such as mass accretion and dynamical capture could alter these predictions.","PeriodicalId":15445,"journal":{"name":"Journal of Cosmology and Astroparticle Physics","volume":"8 1","pages":""},"PeriodicalIF":6.4,"publicationDate":"2025-05-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143945586","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Radio lines from accreting axion stars 来自吸积轴子恒星的射电线

IF 6.4 2区物理与天体物理

Journal of Cosmology and Astroparticle Physics Pub Date : 2025-05-13 DOI: 10.1088/1475-7516/2025/05/033

Dennis Maseizik, Sagnik Mondal, Hyeonseok Seong and Günter Sigl

{"title":"Radio lines from accreting axion stars","authors":"Dennis Maseizik, Sagnik Mondal, Hyeonseok Seong and Günter Sigl","doi":"10.1088/1475-7516/2025/05/033","DOIUrl":"https://doi.org/10.1088/1475-7516/2025/05/033","url":null,"abstract":"Axion-like particles, which we call axions, can compose the missing dark matter and may form substructures such as miniclusters and axion stars. We obtain the mass distributions of axion stars derived from their host miniclusters in our galaxy and find a significant number of axion stars reaching the decay mass, the critical mass set by the axion-photon coupling. Axion stars that have reached the decay mass can accrete surrounding axions either via or directly from their host miniclusters, subsequently converting them into radio photons through parametric resonance. We demonstrate that this accretion provides observable signals by proposing two scenarios: 1) external accretion of background dark matter occurring via miniclusters, and 2) internal accretion of isolated systems occurring directly from the minicluster onto its core. The emitted radio photons are nearly monochromatic with energies around the half of the axion mass. The radio-line signal emanating from such axion stars provides a distinctive opportunity searching for axions, overcoming the widespread radio backgrounds. We estimate the expected radio-line flux density to constrain the axion-photon coupling g_aγγ at each axion mass and find that the resultant line flux density is strong enough to be observed in radio telescopes such as LOFAR, FAST, ALMA, and upcoming SKA. We can constrain the axion-photon coupling down to gaγγ ≃ 10-12–10-11 GeV-1, reaching even 10-13 GeV-1 depending on the accretion models of axion stars, over an axion mass range of ma ≃ 10-7–10-2 eV. From a different perspective, this radio-line signal could be a strong hint of an axion at the corresponding mass and also of axion stars within our galaxy.","PeriodicalId":15445,"journal":{"name":"Journal of Cosmology and Astroparticle Physics","volume":"8 1","pages":""},"PeriodicalIF":6.4,"publicationDate":"2025-05-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143945734","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Prospecting bipartite dark matter through gravitational waves 利用引力波探测双部暗物质

IF 6.4 2区物理与天体物理

Journal of Cosmology and Astroparticle Physics Pub Date : 2025-05-13 DOI: 10.1088/1475-7516/2025/05/035

Pankaj Borah, Pradipta Ghosh and Abhijit Kumar Saha

{"title":"Prospecting bipartite dark matter through gravitational waves","authors":"Pankaj Borah, Pradipta Ghosh and Abhijit Kumar Saha","doi":"10.1088/1475-7516/2025/05/035","DOIUrl":"https://doi.org/10.1088/1475-7516/2025/05/035","url":null,"abstract":"We explore the gravitational wave probes of a two-component dark matter framework, consisting of an SU(2)L triplet scalar and a Standard Model singlet fermion. The triplet scalar dark matter typically remains underabundant in the region below ∼ 1.9 TeV, due to the strong SU(2)L gauge mediated interactions. We introduce a second dark matter component, an SU(2)L singlet vector-like Dirac fermion, to address this deficit in the dark matter relic abundance within a sub-TeV range. A key aspect of the proposed setup is the potential dark matter inter-conversion between the two components, which impacts the dark matter freeze-out dynamics and relic density of individual dark matter components. In such a scenario, we examine the properties of electroweak phase transition and identify the regions of parameter space that exhibit strong first-order phase transition. We estimate the resulting gravitational wave spectrum and its detectability, which could be probed through the conventional power-law-integrated sensitivity limits and the recently proposed peak-integrated sensitivity curves. Our analysis reveals that a novel region of the model's parameter space, compatible with dark matter observables, can generate a detectable gravitational wave spectrum, observable by upcoming space-based gravitational wave detectors such as LISA, BBO, DECIGO, and DECIGOcorr, while also offering complementary detection prospects in the dark matter and collider experiments.","PeriodicalId":15445,"journal":{"name":"Journal of Cosmology and Astroparticle Physics","volume":"25 1","pages":""},"PeriodicalIF":6.4,"publicationDate":"2025-05-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143945736","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Global 21 cm signal: a promising probe of primordial features 全球21厘米信号：对原始特征的有希望的探测

IF 6.4 2区物理与天体物理

Journal of Cosmology and Astroparticle Physics Pub Date : 2025-05-13 DOI: 10.1088/1475-7516/2025/05/038

Suvedha Suresh Naik, Pravabati Chingangbam, Saurabh Singh, Andrei Mesinger and Kazuyuki Furuuchi

{"title":"Global 21 cm signal: a promising probe of primordial features","authors":"Suvedha Suresh Naik, Pravabati Chingangbam, Saurabh Singh, Andrei Mesinger and Kazuyuki Furuuchi","doi":"10.1088/1475-7516/2025/05/038","DOIUrl":"https://doi.org/10.1088/1475-7516/2025/05/038","url":null,"abstract":"Inflationary models that involve bursts of particle production generate bump-like features in the primordial power spectrum of density perturbations. These features influence the evolution of density fluctuations, leaving their unique signatures in cosmological observations. A detailed investigation of such signatures would help constrain physical processes during inflation. With this motivation, the goal of this paper is two-fold. First, we conduct a detailed analysis of the effects of bump-like primordial features on the sky-averaged 21 cm signal. Using semi-numerical simulations, we demonstrate that the primordial features can significantly alter the ionization history and the global 21 cm profile, making them a promising probe of inflationary models. We found a special scale (namely, the turnover wavenumber, kturn) at which the effect of primordial bump-like features on the global 21 cm profile vanishes. Also, we found that the behaviour of the primordial features on the global profile and ionization history are quite opposite for k > kturn and k < kturn. We trace the root cause of these behaviours to the effects of primordial features on the halo mass function at high redshifts. Furthermore, we discuss the degeneracy between the astrophysical parameters and the primordial features in detail. Secondly, for a fixed set of astrophysical parameters, we derive upper limits on the amplitude of bump-like features in the range 10-1 < k [ Mpc^-1] < 102 using current limits on optical depth to reionization from CMB data by Planck.","PeriodicalId":15445,"journal":{"name":"Journal of Cosmology and Astroparticle Physics","volume":"77 1","pages":""},"PeriodicalIF":6.4,"publicationDate":"2025-05-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143945738","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0