Journal of Cosmology and Astroparticle Physics最新文献

Enhanced axion-wind near Earth's surface 地球表面附近增强的轴风

IF 6.4 2区物理与天体物理

Journal of Cosmology and Astroparticle Physics Pub Date : 2025-10-06 DOI: 10.1088/1475-7516/2025/10/022

Yeray Garcia del Castillo, Benjamin Hammett and Joerg Jaeckel

引用次数: 0

The impact of 2D and 3D BAO measurements on the Cosmic Distance Duality Relation with HII galaxies 二维和三维BAO测量对宇宙距离与HII星系对偶关系的影响

IF 6.4 2区物理与天体物理

Journal of Cosmology and Astroparticle Physics Pub Date : 2025-10-06 DOI: 10.1088/1475-7516/2025/10/029

Jie Zheng, Da-Chun Qiang, Zhi-Qiang You and Darshan Kumar

{"title":"The impact of 2D and 3D BAO measurements on the Cosmic Distance Duality Relation with HII galaxies","authors":"Jie Zheng, Da-Chun Qiang, Zhi-Qiang You and Darshan Kumar","doi":"10.1088/1475-7516/2025/10/029","DOIUrl":"https://doi.org/10.1088/1475-7516/2025/10/029","url":null,"abstract":"The cosmic distance duality relation (CDDR) is a fundamental and practical condition in observational cosmology that connects the luminosity distance and angular diameter distance. Testing its validity offers a powerful tool to probe new physics beyond the standard cosmological model. In this work, for the first time, we present a novel consistency test of CDDR by combining HII galaxy data with a comprehensive set of Baryon Acoustic Oscillations (BAO) measurements. The BAO measurements include two-dimensional (2D) BAO and three-dimensional (3D) BAO from the Sloan Digital Sky Survey (SDSS), as well as the latest 3D BAO data from the Dark Energy Spectroscopic Instrument (DESI) Data Release 2 (DR2). We adopt four different parameterizations of the distance duality relation parameter, η(z), to investigate possible deviations and their evolution with cosmic time. To ensure accurate redshift matching across datasets, we reconstruct the distance measures through a model-independent Artificial Neural Network (ANN) approach. We find no significant deviation from the CDDR (less than 68% confidence level) among four parameterizations. Furthermore, our results show that the constraints on η(z) obtained separately from 2D and 3D BAO measurements are consistent at the 68% confidence level. This indicates that there is no significant tension between the two datasets under the four parameterizations considered. Our ANN reconstruction of HII galaxies could provide constraints on the CDDR at redshifts beyond the reach of Type Ia supernovae. Finally, the consistency of our results supports the standard CDDR and demonstrates the robustness of our analytical approach.","PeriodicalId":15445,"journal":{"name":"Journal of Cosmology and Astroparticle Physics","volume":"15 1","pages":""},"PeriodicalIF":6.4,"publicationDate":"2025-10-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145235181","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

Scale-dependent bias and mode coupling in redshift-space clustering near the BAO scale BAO尺度附近红移空间聚类中的尺度相关偏差和模式耦合

IF 6.4 2区物理与天体物理

Journal of Cosmology and Astroparticle Physics Pub Date : 2025-10-06 DOI: 10.1088/1475-7516/2025/10/031

Aseem Paranjape and Ravi K. Sheth

{"title":"Scale-dependent bias and mode coupling in redshift-space clustering near the BAO scale","authors":"Aseem Paranjape and Ravi K. Sheth","doi":"10.1088/1475-7516/2025/10/031","DOIUrl":"https://doi.org/10.1088/1475-7516/2025/10/031","url":null,"abstract":"The baryon acoustic oscillation (BAO) feature in the 2-point clustering of biased tracers in redshift space can be described in a model-agnostic manner, relying only on the assumption that nonlinear growth approximately smears this feature with a Gaussian kernel sourced by gravitationally driven bulk flows as in the Zel'dovich approximation. An explicit model that demonstrated this in recent work did not account for two physical effects that are very likely observationally relevant in the context of ongoing surveys, namely, the scale-dependence of linear Lagrangian density and velocity bias and the effects of mode coupling. We rectify this shortcoming in this paper by showing that a simple model including these effects is able to accurately describe the multipoles of the 2pcf of realistic tracer samples at BAO scales. Our results indicate that the effects of scale-dependent bias will be important to model for surveys such as DESI, while those of mode coupling are relatively less significant. Our model for scale-dependent bias and mode coupling, which is motivated by model-agnostic arguments from peaks theory and the Zel'dovich approximation, lies in the class of `Laplace-Gauss' expansions, making it straightforward to incorporate these effects in the model-agnostic inference framework mentioned above.","PeriodicalId":15445,"journal":{"name":"Journal of Cosmology and Astroparticle Physics","volume":"107 1","pages":""},"PeriodicalIF":6.4,"publicationDate":"2025-10-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145235183","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

Can asteroid-mass PBHDM be compatible with catalyzed phase transition interpretation of PTA? 小行星质量PBHDM是否与PTA的催化相变解释相容？

IF 6.4 2区物理与天体物理

Journal of Cosmology and Astroparticle Physics Pub Date : 2025-10-06 DOI: 10.1088/1475-7516/2025/10/033

Jiahang Zhong, Chao Chen and Yi-Fu Cai

{"title":"Can asteroid-mass PBHDM be compatible with catalyzed phase transition interpretation of PTA?","authors":"Jiahang Zhong, Chao Chen and Yi-Fu Cai","doi":"10.1088/1475-7516/2025/10/033","DOIUrl":"https://doi.org/10.1088/1475-7516/2025/10/033","url":null,"abstract":"Primordial black holes (PBHs) can catalyze first-order phase transitions (FOPTs) in their vicinity, potentially modifying the gravitational wave (GW) signals from PTs. In this study, we investigate the GWs from strong PTs catalyzed by PBHs. We consider high PBH number densities, corresponding to asteroid-mass PBH dark matter (DM) when the GWs from FOPTs peak in the nanohertz band. We calculate the PBH-catalyzed FOPT GWs from both bubble collision GWs and scalar-induced gravitational waves (SIGWs). We find that while low PBH number densities amplify the GW signals due to the formation of large bubbles, high PBH number densities suppress them, as the accelerated phase transition proceeds too rapidly. This suppression renders the signals unable to explain pulsar timing array (PTA) observations. By conducting data fitting with the NANOGrav 15-year dataset, we find that the PBH catalytic effect significantly alters the estimation of PT parameters. Notably, our analysis of the bubble collision GWs reveals that, the asteroid-mass PBHs (10-16-10-12M⊙) constituting all DM is incompatible with the PT interpretation of PTA signals. However, incorporating SIGWs alleviates this incompatibility for PBHs in the mass range 10-14-10-12M⊙.","PeriodicalId":15445,"journal":{"name":"Journal of Cosmology and Astroparticle Physics","volume":"28 1","pages":""},"PeriodicalIF":6.4,"publicationDate":"2025-10-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145235257","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

Primordial black hole formation in a scalar field dominated universe 在标量场占主导的宇宙中形成的原始黑洞

IF 6.4 2区物理与天体物理

Journal of Cosmology and Astroparticle Physics Pub Date : 2025-10-06 DOI: 10.1088/1475-7516/2025/10/025

Ethan Milligan, Luis E. Padilla, David J. Mulryne and Juan Carlos Hidalgo

{"title":"Primordial black hole formation in a scalar field dominated universe","authors":"Ethan Milligan, Luis E. Padilla, David J. Mulryne and Juan Carlos Hidalgo","doi":"10.1088/1475-7516/2025/10/025","DOIUrl":"https://doi.org/10.1088/1475-7516/2025/10/025","url":null,"abstract":"We present a numerical code that solves the Misner-Sharp system for a spherically symmetric cosmological model containing both a scalar field and a perfect fluid. While the code is capable of exploring general scenarios involving a minimally coupled scalar field and perfect fluid, we focus on the regime where the scalar field dominates the dynamics, particularly in the post-inflationary scalar field-dominated scenario, where the universe is governed by a rapidly oscillating scalar field for a period lasting a few e-folds. We analyse the threshold for PBH formation under quadratic and quartic potentials, evolving configurations from superhorizon scales. Our results confirm that a quartic potential behavior is similar to the radiation-dominated universe, resulting in a PBH formation threshold close to the well-established value in radiation backgrounds. Conversely, in the quadratic case, we observe a significant deviation from the expected dust-like behaviour, due to wave-like effects opposing the gravitational collapse. While numerical limitations prevent us from evolving a wide range of initial conditions to determine a precise threshold for PBH formation, our findings suggest that PBH formation may be suppressed with respect to the pure dust scenario, allowing the formation of stable solitonic structures instead. This study highlights the importance of properly accounting for wave dynamics in oscillating scalar fields when characterising PBH formation.","PeriodicalId":15445,"journal":{"name":"Journal of Cosmology and Astroparticle Physics","volume":"30 1","pages":""},"PeriodicalIF":6.4,"publicationDate":"2025-10-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145235180","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

External attention transformer: A robust AI model for identifying initial eccentricity signatures in binary black hole events in simulated advanced LIGO data 外部注意力转换器：一种鲁棒人工智能模型，用于识别模拟高级LIGO数据中双黑洞事件的初始偏心特征

IF 6.4 2区物理与天体物理

Journal of Cosmology and Astroparticle Physics Pub Date : 2025-10-06 DOI: 10.1088/1475-7516/2025/10/028

Elahe Khalouei, Cristiano G. Sabiu, Hyung Mok Lee and A. Gopakumar

{"title":"External attention transformer: A robust AI model for identifying initial eccentricity signatures in binary black hole events in simulated advanced LIGO data","authors":"Elahe Khalouei, Cristiano G. Sabiu, Hyung Mok Lee and A. Gopakumar","doi":"10.1088/1475-7516/2025/10/028","DOIUrl":"https://doi.org/10.1088/1475-7516/2025/10/028","url":null,"abstract":"Initial orbital eccentricities of gravitational wave (GW) events associated with merging binary black holes (BBHs) should provide clues to their formation scenarios, mainly because various BBH formation channels predict distinct eccentricity distributions. However, searching for inspiral GWs from eccentric BBHs is computationally challenging due to sophisticated approaches to model such GW events. This ensures that Bayesian parameter estimation methods to characterize such events are computationally daunting. These considerations influenced us to propose a novel approach to identify and characterize eccentric BBH events in the LIGO-Virgo-KAGRA (LVK) collaboration data sets that leverages external attention transformer models. Employing simulated data that mimic LIGO O4 run, eccentric inspiral events modeled by an effective-one-body numerical- relativity waveform family, we show the effectiveness of our approach. By integrating this transformer-based framework with a convolutional neural network (CNN) architecture, we provide efficient way to identify eccentric BBH GW events and accurately characterize their source properties.","PeriodicalId":15445,"journal":{"name":"Journal of Cosmology and Astroparticle Physics","volume":"26 1","pages":""},"PeriodicalIF":6.4,"publicationDate":"2025-10-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145235179","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

Gravitational wave signatures of primordial black hole accretion during early matter domination 早期物质统治时期原始黑洞吸积的引力波特征

IF 6.4 2区物理与天体物理

Journal of Cosmology and Astroparticle Physics Pub Date : 2025-10-06 DOI: 10.1088/1475-7516/2025/10/026

Rouzbeh Allahverdi, James B. Dent, Ngo Phuc Duc Loc and Tao Xu

引用次数: 0

Massive fields affected by echoes: New physics vs. astrophysical environment 受回声影响的巨大场：新物理学与天体物理环境

IF 6.4 2区物理与天体物理

Journal of Cosmology and Astroparticle Physics Pub Date : 2025-10-06 DOI: 10.1088/1475-7516/2025/10/027

Roman A. Konoplya, Z. Stuchlík and A. Zhidenko

引用次数: 0

Impact of calibration and position errors on astrophysical parameters of the Hi 21cm signal 标定和定位误差对Hi 21cm信号天体物理参数的影响

IF 6.4 2区物理与天体物理

Journal of Cosmology and Astroparticle Physics Pub Date : 2025-10-06 DOI: 10.1088/1475-7516/2025/10/035

Anshuman Tripathi, Abhirup Datta, Aishrila Mazumder and Suman Majumdar

{"title":"Impact of calibration and position errors on astrophysical parameters of the Hi 21cm signal","authors":"Anshuman Tripathi, Abhirup Datta, Aishrila Mazumder and Suman Majumdar","doi":"10.1088/1475-7516/2025/10/035","DOIUrl":"https://doi.org/10.1088/1475-7516/2025/10/035","url":null,"abstract":"The Epoch of Reionization (EoR) and Cosmic Dawn (CD) are pivotal stages during the first billion years of the universe, exerting a significant influence on the development of cosmic structure. The detection of the redshifted 21-cm signal from these epochs is challenging due to the dominance of significantly stronger astrophysical foregrounds and the presence of systematics. This work used the 21cm E2E (end to end) pipeline, followed by simulation methodology described [1] to conduct synthetic observations of a simulated sky model that includes both the redshifted 21-cm signal and foregrounds. A framework was constructed using Artificial Neural Networks (ANN) and Bayesian techniques to directly deduce astrophysical parameters from the measured power spectrum. This approach eliminates the need for explicit telescope layout effects correction in interferometric arrays such as SKA-Low. The present work investigates the impact of gain calibration errors and sky model position errors on the recovery of the redshifted 21-cm power spectrum for the SKA-Low AA^∗ array configuration. We assessed the effects of these inaccuracies on the deduced astrophysical parameters and established acceptable tolerance levels. Based on our results, the gain calibration error tolerance for ideal signal detection is 0.001 %. However, if the sky model position errors exceed 0.048 arcseconds, the remaining foregrounds would obscure the target signal.","PeriodicalId":15445,"journal":{"name":"Journal of Cosmology and Astroparticle Physics","volume":"27 1","pages":""},"PeriodicalIF":6.4,"publicationDate":"2025-10-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145235264","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

Nonlinearities in Kerr black hole ringdown from the Penrose limit 克尔黑洞从彭罗斯极限环降的非线性

IF 6.4 2区物理与天体物理

Journal of Cosmology and Astroparticle Physics Pub Date : 2025-10-06 DOI: 10.1088/1475-7516/2025/10/024

Davide Perrone, Alex Kehagias and Antonio Riotto

引用次数: 0