Journal of Cosmology and Astroparticle Physics最新文献_第2页

Nanohertz gravitational waves from a quasar-based supermassive black hole binary population model as dark sirens 基于类星体的超大质量黑洞双星人口模型的纳赫兹引力波就像黑暗的警报器

IF 6.4 2区物理与天体物理

Journal of Cosmology and Astroparticle Physics Pub Date : 2025-04-22 DOI: 10.1088/1475-7516/2025/04/060

Si-Ren Xiao, Yue Shao, Ling-Feng Wang, Ji-Yu Song, Lu Feng, Jing-Fei Zhang, Xin Zhang

{"title":"Nanohertz gravitational waves from a quasar-based supermassive black hole binary population model as dark sirens","authors":"Si-Ren Xiao, Yue Shao, Ling-Feng Wang, Ji-Yu Song, Lu Feng, Jing-Fei Zhang, Xin Zhang","doi":"10.1088/1475-7516/2025/04/060","DOIUrl":"https://doi.org/10.1088/1475-7516/2025/04/060","url":null,"abstract":"Recently, several pulsar timing array (PTA) projects have detected evidence of the existence of a stochastic gravitational wave background (SGWB) in the nanohertz frequency band, providing confidence in detecting individual supermassive black hole binaries (SMBHBs) in the future. Nanohertz GWs emitted by inspiraling SMBHBs encode the luminosity distances of SMBHBs. They can serve as dark sirens to explore the cosmic expansion history via a statistical method to obtain the redshift information of GW sources' host galaxies using galaxy catalogs. The theoretical analysis of the dark siren method relies on the modeling of the population of SMBHBs. Using a population model consistent with the latest SGWB observations is essential, as the SGWB provides significant information about the distribution of SMBHBs. In this work, we employ a quasar-based model, which can self-consistently account for the SGWB amplitude, to estimate the population of SMBHBs. We constrain the Hubble constant using the mock GW data from different detection cases of PTAs in the future.\u0000Our results show that a PTA consisting of 100 pulsars with a white noise level of 20 ns could measure the Hubble constant with a precision close to 1% over a 10-year observation period, and a PTA with 200 pulsars may achieve this goal over a 5-year observation period. The results indicate that modeling the SMBHB population significantly influences the analysis of dark sirens, and SMBHB dark sirens have the potential to be developed as a valuable cosmological probe.","PeriodicalId":15445,"journal":{"name":"Journal of Cosmology and Astroparticle Physics","volume":"4 1","pages":""},"PeriodicalIF":6.4,"publicationDate":"2025-04-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143862863","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

Quasinormal ringing and shadows of black holes and wormholes in dark matter-inspired Weyl gravity 暗物质激发的Weyl引力中黑洞和虫洞的准不规则环和阴影

IF 6.4 2区物理与天体物理

Journal of Cosmology and Astroparticle Physics Pub Date : 2025-04-22 DOI: 10.1088/1475-7516/2025/04/062

Roman A. Konoplya, Andrii Khrabustovskyi, Jan Kříž, Alexander Zhidenko

{"title":"Quasinormal ringing and shadows of black holes and wormholes in dark matter-inspired Weyl gravity","authors":"Roman A. Konoplya, Andrii Khrabustovskyi, Jan Kříž, Alexander Zhidenko","doi":"10.1088/1475-7516/2025/04/062","DOIUrl":"https://doi.org/10.1088/1475-7516/2025/04/062","url":null,"abstract":"Weyl gravity naturally generates effective dark matter and cosmological constant terms as integration constants, eliminating the need to explicitly introduce them into the theory. Additionally, the framework permits three intriguing solutions for compact objects: an asymptotically de Sitter Schwarzschild-like black hole described by the Mannheim-Kazanas solution, a non-Schwarzschild black hole, and a traversable wormhole that exists without exotic matter. In this work, we investigate the quasinormal spectra of all three solutions. We demonstrate that when the mass of the black hole corresponding to the Mannheim-Kazanas solution approaches zero, the perturbation equations yield an exact solution expressible through hypergeometric functions. The quasinormal modes of black holes in Weyl gravity can be classified into three distinct branches: Schwarzschild-like modes modified by effective dark matter and cosmological terms, and modes associated with empty spacetime (de Sitter and dark matter branches), which are further influenced by the black hole mass. Previous studies have shown that the dark matter term induces a secondary stage of quasinormal ringing following the initial Schwarzschild phase. Here, we compute the frequencies using convergent methods and elucidate how this unique time-domain behavior translates into the frequency domain. Furthermore, we demonstrate that the non-Schwarzschild black hole can be distinguished from both the Schwarzschild-like solution and the wormhole through their distinct quasinormal spectra. We also compute shadow radii for black holes and wormholes within Weyl gravity, revealing that wormholes with large throat radii can produce significantly smaller shadows compared to black holes of equivalent mass.","PeriodicalId":15445,"journal":{"name":"Journal of Cosmology and Astroparticle Physics","volume":"31 1","pages":""},"PeriodicalIF":6.4,"publicationDate":"2025-04-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143862983","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

Potential surge preheating: enhanced resonance from potential features 电势浪涌预热：电势特征增强共振

IF 6.4 2区物理与天体物理

Journal of Cosmology and Astroparticle Physics Pub Date : 2025-04-22 DOI: 10.1088/1475-7516/2025/04/061

Pankaj Saha, Yuko Urakawa

{"title":"Potential surge preheating: enhanced resonance from potential features","authors":"Pankaj Saha, Yuko Urakawa","doi":"10.1088/1475-7516/2025/04/061","DOIUrl":"https://doi.org/10.1088/1475-7516/2025/04/061","url":null,"abstract":"We investigate the effects of local features in the inflationary potential on the preheating dynamics after inflation. We show that a small feature in the potential can enhance the resonance and bring the radiation-like state equation during preheating despite the inflationary potential being a quadratic one. Such localized features may naturally arise due to various physical effects without altering the large-scale predictions of the original model for cosmic microwave background (CMB) observables. We demonstrate that these features effectively introduce localized higher-power terms in the potential, significantly influencing the preheating dynamics — a phenomenon we term potential surge preheating. We outline the resulting modifications in energy distribution among different components. We further show that these small-scale features leave detectable imprints in the form of gravitational wave signals. These signals influence CMB measurements of the effective number of relativistic species, <italic toggle=\"yes\">N</italic>\u0000eff, offering a way to reconstruct the shape of the inflaton potential at small scales. Finally, we argue that these modifications to the scalar potential provide a framework to explore preheating dynamics and the fragmentation of scalar fields using simple scalar potentials.","PeriodicalId":15445,"journal":{"name":"Journal of Cosmology and Astroparticle Physics","volume":"42 1","pages":""},"PeriodicalIF":6.4,"publicationDate":"2025-04-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143862987","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

The gravitational wave bias parameter from angular power spectra: bridging between galaxies and binary black holes 角功率谱引力波偏置参数：星系与双黑洞之间的桥梁

IF 6.4 2区物理与天体物理

Journal of Cosmology and Astroparticle Physics Pub Date : 2025-04-22 DOI: 10.1088/1475-7516/2025/04/056

Amir Dehghani, J. Leo Kim, Dorsa Sadat Hosseini, Alex Krolewski, Suvodip Mukherjee, Ghazal Geshnizjani

{"title":"The gravitational wave bias parameter from angular power spectra: bridging between galaxies and binary black holes","authors":"Amir Dehghani, J. Leo Kim, Dorsa Sadat Hosseini, Alex Krolewski, Suvodip Mukherjee, Ghazal Geshnizjani","doi":"10.1088/1475-7516/2025/04/056","DOIUrl":"https://doi.org/10.1088/1475-7516/2025/04/056","url":null,"abstract":"This study presents the modeling of the gravitational wave (GW) bias parameter by bridging a connection between simulated GW sources and galaxies in low redshift galaxy surveys 2MPZ and WISExSCOS (WISC).\u0000We study this connection by creating a mock GW catalog, populating galaxy surveys with binary black holes (BBHs) for different scenarios of the GW host-galaxy probability as a function of the galaxy stellar mass. We probe the observable consequences of this connection by exploring the spatial clustering of the GW sources in terms of the GW bias parameter. We consider a phenomenological broken power law model for the host-galaxy probability function, with a potential turnover <italic toggle=\"yes\">M𝒦\u0000</italic> at high stellar mass (1011\u0000<italic toggle=\"yes\">M⊙\u0000</italic> in the fiducial model) where the star formation efficiency begins to drop. We vary the parameters of the GW host-galaxy probability function and find that generically the GW bias increases as <italic toggle=\"yes\">M𝒦\u0000</italic> increases (and gets suppressed as <italic toggle=\"yes\">M𝒦\u0000</italic> decreases). The change in the GW bias parameter shows a maximum change of about 30% for different scenarios explored in this work in comparison to the galaxy bias. Future measurements of the GW bias can help constrain <italic toggle=\"yes\">M𝒦\u0000</italic> and the slopes of the host-galaxy probability function and thus offer insights into the underlying astrophysical processes.","PeriodicalId":15445,"journal":{"name":"Journal of Cosmology and Astroparticle Physics","volume":"71 1","pages":""},"PeriodicalIF":6.4,"publicationDate":"2025-04-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143862862","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

Calculating the EFT likelihood via saddle-point expansion 通过鞍点展开计算EFT的可能性

IF 6.4 2区物理与天体物理

Journal of Cosmology and Astroparticle Physics Pub Date : 2025-04-22 DOI: 10.1088/1475-7516/2025/04/064

Ji-Yuan Ke, Yun Wang, Ping He

引用次数: 0

The impact of cosmic variance on PTAs anisotropy searches 宇宙方差对pta各向异性搜索的影响

IF 6.4 2区物理与天体物理

Journal of Cosmology and Astroparticle Physics Pub Date : 2025-04-22 DOI: 10.1088/1475-7516/2025/04/059

Thomas Konstandin, Anna-Malin Lemke, Andrea Mitridate, Enrico Perboni

{"title":"The impact of cosmic variance on PTAs anisotropy searches","authors":"Thomas Konstandin, Anna-Malin Lemke, Andrea Mitridate, Enrico Perboni","doi":"10.1088/1475-7516/2025/04/059","DOIUrl":"https://doi.org/10.1088/1475-7516/2025/04/059","url":null,"abstract":"Several Pulsar Timing Array (PTA) collaborations have recently found evidence for a Gravitational Wave Background (GWB) by measuring the perturbations that this background induces in the time-of-arrivals of pulsar signals. These perturbations are expected to be correlated across different pulsars and, for isotropic GWBs, the <italic toggle=\"yes\">expected</italic> values of these correlations (obtained by averaging over different GWB realizations) are a simple function of the pulsars' angular separations, known as the Hellings-Downs (HD) correlation function. On the other hand, anisotropic GWBs would induce deviations from these HD correlations in a way that can be used to search for anisotropic distributions of the GWB power. However, even for isotropic GWBs, interference between GW sources radiating at overlapping frequencies induces deviations from the HD correlation pattern, an effect known in the literature as “<italic toggle=\"yes\">cosmic variance</italic>”. In this work, we study the impact of cosmic variance on PTA anisotropy searches. We find that the fluctuations in cross-correlations related to cosmic variance can lead to the miss-classification of isotropic GWBs as anisotropic, leading to a false detection rate of ∼ 50% for frequentist anisotropy searches. We also observe that cosmic variance complicates the reconstruction of the GWB sky map, making it more challenging to resolve bright GW hotspots, like the ones expected to be produced from a Supermassive Black Hole Binaries population. These findings highlight the need to refine anisotropy search techniques to improve our ability to reconstruct the GWB sky map and accurately assess the significance of any isotropy deviations we might find in it.","PeriodicalId":15445,"journal":{"name":"Journal of Cosmology and Astroparticle Physics","volume":"108 1","pages":""},"PeriodicalIF":6.4,"publicationDate":"2025-04-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143862864","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

Kinetic gauge friction in natural inflation 自然膨胀时的动态表摩擦

IF 6.4 2区物理与天体物理

Journal of Cosmology and Astroparticle Physics Pub Date : 2025-04-22 DOI: 10.1088/1475-7516/2025/04/058

Martino Michelotti, Rodrigo Gonzalez Quaglia, Ema Dimastrogiovanni, Matteo Fasiello, Diederik Roest

引用次数: 0

Reevaluating H 0 tension with non-Planck CMB and DESI BAO joint analysis 用非普朗克CMB和DESI BAO联合分析重新评估h0张力

IF 6.4 2区物理与天体物理

Journal of Cosmology and Astroparticle Physics Pub Date : 2025-04-22 DOI: 10.1088/1475-7516/2025/04/057

Ye-Huang Pang, Xue Zhang, Qing-Guo Huang

{"title":"Reevaluating H 0 tension with non-Planck CMB and DESI BAO joint analysis","authors":"Ye-Huang Pang, Xue Zhang, Qing-Guo Huang","doi":"10.1088/1475-7516/2025/04/057","DOIUrl":"https://doi.org/10.1088/1475-7516/2025/04/057","url":null,"abstract":"<italic toggle=\"yes\">H</italic>\u00000 tension in the spatially flat ΛCDM model is reevaluated by employing three sets of non-<italic toggle=\"yes\">Planck</italic> CMB data, namely WMAP, WMAP+ACT, and WMAP+SPT, in conjunction with DESI BAO data and non-DESI BAO datasets including 6dFGS, SDSS DR7, and SDSS DR16. Our analysis yields <italic toggle=\"yes\">H</italic>\u00000 = 68.86 ± 0.68 km s-1 Mpc-1 with WMAP+DESI BAO, <italic toggle=\"yes\">H</italic>\u00000 = 68.72 ± 0.51 km s-1 Mpc-1 with WMAP+ACT+DESI BAO, and <italic toggle=\"yes\">H</italic>\u00000 = 68.62 ± 0.52 km s-1 Mpc-1 with WMAP+SPT+DESI BAO.\u0000The results of non-<italic toggle=\"yes\">Planck</italic> CMB+DESI BAO exhibit a 3.4<italic toggle=\"yes\">σ</italic>, 3.7<italic toggle=\"yes\">σ</italic>, and 3.8<italic toggle=\"yes\">σ</italic> tension with the SH0ES local measurement respectively which are around 1<italic toggle=\"yes\">σ</italic> lower in significance for the Hubble tension compared to <italic toggle=\"yes\">Planck</italic> CMB+DESI BAO.\u0000Moreover, by combining DESI BAO data+non-<italic toggle=\"yes\">Planck</italic> CMB measurements, we obtain a more stringent constraint on the Hubble constant compared to non-DESI BAO data+non-<italic toggle=\"yes\">Planck</italic> CMB data, as well as reducing the significance of the Hubble tension.","PeriodicalId":15445,"journal":{"name":"Journal of Cosmology and Astroparticle Physics","volume":"17 1","pages":""},"PeriodicalIF":6.4,"publicationDate":"2025-04-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143862941","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

Horndeski in motion 霍恩德斯基在行动

IF 6.4 2区物理与天体物理

Journal of Cosmology and Astroparticle Physics Pub Date : 2025-04-16 DOI: 10.1088/1475-7516/2025/04/051

J. Bayron Orjuela-Quintana and Jose Beltrán Jiménez

引用次数: 0

The special case of slow-roll attractors in de Sitter: non-Markovian noise and evolution of entanglement entropy 德西特慢滚吸引子的特殊情况：非马尔可夫噪声和纠缠熵的演化

IF 6.4 2区物理与天体物理

Journal of Cosmology and Astroparticle Physics Pub Date : 2025-04-16 DOI: 10.1088/1475-7516/2025/04/050

Suddhasattwa Brahma, Jaime Calderón-Figueroa, Xiancong Luo and David Seery

引用次数: 0