Journal of Cosmology and Astroparticle Physics最新文献_第8页

Primordial black hole formation from a type II perturbation in the absence and presence of pressure 在没有压力和存在压力的情况下，由II型扰动形成的原始黑洞

IF 6.4 2区物理与天体物理

Journal of Cosmology and Astroparticle Physics Pub Date : 2025-08-13 DOI: 10.1088/1475-7516/2025/08/042

Koichiro Uehara, Albert Escrivà, Tomohiro Harada, Daiki Saito and Chul-Moon Yoo

引用次数: 0

Precessions of spherical orbits in the rotating Melvin black hole spacetime and its constraints from the jet of M87* 旋转Melvin黑洞时空中球面轨道的进动及其来自M87*喷流的约束

IF 6.4 2区物理与天体物理

Journal of Cosmology and Astroparticle Physics Pub Date : 2025-08-13 DOI: 10.1088/1475-7516/2025/08/043

Chengjia Chen, Qiyuan Pan and Jiliang Jing

{"title":"Precessions of spherical orbits in the rotating Melvin black hole spacetime and its constraints from the jet of M87*","authors":"Chengjia Chen, Qiyuan Pan and Jiliang Jing","doi":"10.1088/1475-7516/2025/08/043","DOIUrl":"https://doi.org/10.1088/1475-7516/2025/08/043","url":null,"abstract":"We investigate the precessions of spherical orbits of timelike particles in the background of a rotating black hole immersed in the Melvin magnetic field, and probe the effects of the magnetic field on the precession period. Our results show that the effects of the magnetic field on the particles' motions gradually decrease with the increase of the titled angle and finally vanish as the titled angle tends to π/2. With the increase of the magnetic field parameter, we find that the precession becomes rapid. Modelling the spherical orbit to the warp radius in the accretion disk and using the observed precession period from the jet of M87*, we analyze the allowed regions of the black hole parameters and the warp radius in the accretion disk. Especially, we find a novel degenerated phenomenon of precession periods arising from the magnetic field for two different spherical orbits, which does not appear in the usual Kerr black hole case. Moreover, we also discuss the possibility of observing effects of the magnetic field on the precession periods of jets for astrophysical black holes. Our study could help to further understand the rotating Melvin black hole and the relationship between magnetic fields and precessions of jets.","PeriodicalId":15445,"journal":{"name":"Journal of Cosmology and Astroparticle Physics","volume":"22 1","pages":""},"PeriodicalIF":6.4,"publicationDate":"2025-08-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144840060","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

Geodesics and global properties of the Liouville solution in general relativity with a scalar field 带标量场的广义相对论Liouville解的测地线和整体性质

IF 6.4 2区物理与天体物理

Journal of Cosmology and Astroparticle Physics Pub Date : 2025-08-13 DOI: 10.1088/1475-7516/2025/08/045

D.E. Afanasev and M.O. Katanaev

引用次数: 0

Gravitational waves from the E-model inflation with Gauss-Bonnet correction 高斯-邦纳修正的e模型暴胀引力波

IF 6.4 2区物理与天体物理

Journal of Cosmology and Astroparticle Physics Pub Date : 2025-08-12 DOI: 10.1088/1475-7516/2025/08/036

Tie-Jun Gao and Jian-Xia Guo

引用次数: 0

Quasinormal modes and absorption cross-section of a Bardeen black hole surrounded by perfect fluid dark matter in four dimensions 四维中被完美流体暗物质包围的巴丁黑洞的准正态模式和吸收截面

IF 6.4 2区物理与天体物理

Journal of Cosmology and Astroparticle Physics Pub Date : 2025-08-12 DOI: 10.1088/1475-7516/2025/08/035

Angel Rincon, Sharmanthie Fernando, Grigoris Panotopoulos and Leonardo Balart

{"title":"Quasinormal modes and absorption cross-section of a Bardeen black hole surrounded by perfect fluid dark matter in four dimensions","authors":"Angel Rincon, Sharmanthie Fernando, Grigoris Panotopoulos and Leonardo Balart","doi":"10.1088/1475-7516/2025/08/035","DOIUrl":"https://doi.org/10.1088/1475-7516/2025/08/035","url":null,"abstract":"In this paper we study quasinormal modes and absorption cross sections for the (1+3)-dimensional Bardeen black hole surrounded by perfect fluid dark matter. Studies of the massless scalar field is already done in [1]. Hence, in this paper we will focus on the massive scalar field perturbations and massless Dirac field perturbations. To compute the quasinormal modes we use the semi-analytical 3rd-order WKB method, which has been shown to be one of the best approaches when the effective potential is adequate and when n < ℓ and n < λ. We have also utilized the Pöschl-Teller method to compare the valus obtained using the WKB approach. We have computed quasinormal frequencies by varying various parameters of the theory such as the mass of the scalar field μ, dark matter parameter α and the magnetic charge g. We have summarized our solutions in tables and figures for clarity. As for the absorption cross section, we used third order WKB approach to compute reflection, transmission coefficients and partial absorption cross sections. Graphs are presented to demonstrate the behavior of the above quantities when the dark matter parameter and mass of the massive scalar field are varied.","PeriodicalId":15445,"journal":{"name":"Journal of Cosmology and Astroparticle Physics","volume":"23 1","pages":""},"PeriodicalIF":6.4,"publicationDate":"2025-08-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144825027","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

Phenomenology of neutrino-dark matter interaction in DSNB and AGN DSNB和AGN中中微子-暗物质相互作用的现象学

IF 6.4 2区物理与天体物理

Journal of Cosmology and Astroparticle Physics Pub Date : 2025-08-12 DOI: 10.1088/1475-7516/2025/08/038

Po-Yan Tseng and Yu-Min Yeh

{"title":"Phenomenology of neutrino-dark matter interaction in DSNB and AGN","authors":"Po-Yan Tseng and Yu-Min Yeh","doi":"10.1088/1475-7516/2025/08/038","DOIUrl":"https://doi.org/10.1088/1475-7516/2025/08/038","url":null,"abstract":"We investigate a neutrino-scalar dark matter (DM) νϕ interaction encountering distinctive neutrino sources, namely Diffuse Supernova Neutrino Background (DSNB) and Active Galactic Nuclei (AGN). The interaction is mediated by a fermionic particle F, in which the νϕ scattering cross section characterizes different energy dependent with respect to the kinematic regions, and manifests itself through the attenuation of neutrino fluxes from these sources. We model the unscattered neutrino flux from DSNB via core-collapse supernova (CCSN) and star-formation rate (SFR), then incorporate the present Super-Kamionkande and future DUNE/Hyper-Kamiokande experiments to set limits on DM-neutrino interaction. For AGNs, NGC 1068 and TXS 0506+056, where the neutrino carries energy above TeV, we select the kinematic region m2F ≫ Eνmϕ ≫ m2ϕ such that the νϕ scattering cross section features an enhancement at high energy. Furthermore, taking into account the DM spike profile at the center of AGN, we constrain on mϕ and scattering cross section via computing the neutrino flux at IceCube, where the ϕϕ* annihilation cross section is implemented to determine the saturation density of the spikes. Notice that the later results heavily rely on the existence of DM spike at the center of AGN, otherwise, our results may alter.","PeriodicalId":15445,"journal":{"name":"Journal of Cosmology and Astroparticle Physics","volume":"4 1","pages":""},"PeriodicalIF":6.4,"publicationDate":"2025-08-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144825105","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

Scalar field fluctuations and the production of dark matter 标量场波动和暗物质的产生

IF 6.4 2区物理与天体物理

Journal of Cosmology and Astroparticle Physics Pub Date : 2025-08-12 DOI: 10.1088/1475-7516/2025/08/039

Marcos A.G. Garcia, Wenqi Ke, Yann Mambrini, Keith A. Olive and Sarunas Verner

{"title":"Scalar field fluctuations and the production of dark matter","authors":"Marcos A.G. Garcia, Wenqi Ke, Yann Mambrini, Keith A. Olive and Sarunas Verner","doi":"10.1088/1475-7516/2025/08/039","DOIUrl":"https://doi.org/10.1088/1475-7516/2025/08/039","url":null,"abstract":"One of the simplest possible candidates for dark matter is a stable scalar singlet beyond the Standard Model. If its mass is below the Hubble scale during inflation, long-wavelength modes of this scalar will be excited during inflation, and their subsequent evolution may lead to the correct relic density of dark matter. In this work, we provide a comprehensive analysis of the evolution of a spectator scalar. We examine three cases: (1) a non-interacting massive scalar, (2) a massive scalar with self-interactions of the form λχχp, and (3) a massive scalar coupled to the inflaton ϕ through an interaction term of the form σn,mϕnχm. In all cases, we assume minimal coupling to gravity and compare these results with the production of short-wavelength modes arising from single graviton exchange. The evolution is tracked during the reheating phase. Our findings are summarized using (mχ, TRH) parameter planes, where mχ is the mass of the scalar field and TRH is the reheating temperature after inflation. The non-interacting scalar is highly constrained, requiring mχ > 3 × 1012 GeV and TRH ≲ 7 TeV (in the absence of fine-tuning) for an inflationary potential with a quadratic minimum. However, when self-interactions or couplings to the inflaton are included, the viable parameter space expands considerably. In these cases, sub-GeV and even sub-eV scalar masses can yield the correct relic abundance, opening new possibilities for light dark matter candidates. In all cases, we also impose additional constraints arising from the production of isocurvature fluctuations, the prevention of a secondary inflationary phase triggered by the spectator field, and the fragmentation of scalar condensates.","PeriodicalId":15445,"journal":{"name":"Journal of Cosmology and Astroparticle Physics","volume":"27 1","pages":""},"PeriodicalIF":6.4,"publicationDate":"2025-08-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144825102","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

Estimating the gravitational wave background anisotropy: a Bayesian approach boosted by cross-correlation angular power spectrum 估计引力波背景各向异性：一种基于互相关角功率谱的贝叶斯方法

IF 6.4 2区物理与天体物理

Journal of Cosmology and Astroparticle Physics Pub Date : 2025-08-12 DOI: 10.1088/1475-7516/2025/08/037

Chi Tian, Ran Ding and Xiao-Xiao Kou

引用次数: 0

Abundance and properties of dark radiation from the cosmic microwave background 宇宙微波背景暗辐射的丰度和性质

IF 6.4 2区物理与天体物理

Journal of Cosmology and Astroparticle Physics Pub Date : 2025-08-12 DOI: 10.1088/1475-7516/2025/08/040

Murali M. Saravanan, Thejs Brinckmann, Marilena Loverde and Zachary J. Weiner

{"title":"Abundance and properties of dark radiation from the cosmic microwave background","authors":"Murali M. Saravanan, Thejs Brinckmann, Marilena Loverde and Zachary J. Weiner","doi":"10.1088/1475-7516/2025/08/040","DOIUrl":"https://doi.org/10.1088/1475-7516/2025/08/040","url":null,"abstract":"We study the cosmological signatures of new light relics that are collisionless like standard neutrinos or are strongly interacting. We provide a simple and succinct rephrasing of their physical effects in the cosmic microwave background, as well as the resulting parameter degeneracies with other cosmological parameters, in terms of the total radiation abundance and the fraction thereof that freely streams. In these more general terms, interacting and noninteracting light relics are differentiated by their respective decrease and increase of the free-streaming fraction, and, moreover, the scale-dependent interplay thereof with a common, correlated reduction of the fraction of matter in baryons. We then derive updated constraints on various dark-radiation scenarios with the latest cosmological observations, employing this language to identify the physical origin of the impact of each dataset. The “PR4” reanalyses of Planck CMB data prefer a larger primordial helium yield and therefore also slightly more radiation than the 2018 analysis; we investigate the differences between the two releases that drives these shifts. Smaller free-streaming fractions are disfavored by the excess lensing of the CMB measured in lensing reconstruction data from Planck and the Atacama Cosmology Telescope. On the other hand, baryon acoustic oscillation measurements from the Dark Energy Spectroscopic Instrument drive marginal detections of new, strongly interacting light relics due to that data's preference for lower matter fractions. Finally, we forecast measurements from the CMB-S4 experiment.","PeriodicalId":15445,"journal":{"name":"Journal of Cosmology and Astroparticle Physics","volume":"27 1","pages":""},"PeriodicalIF":6.4,"publicationDate":"2025-08-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144825111","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

Cosmic neutrino background detection in the minimally extended Standard Model 最小扩展标准模型中的宇宙中微子背景探测

IF 6.4 2区物理与天体物理

Journal of Cosmology and Astroparticle Physics Pub Date : 2025-08-12 DOI: 10.1088/1475-7516/2025/08/033

Yuber F. Perez-Gonzalez and Jack D. Shergold

引用次数: 0