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

Probing fundamental constant oscillation in the Galactic Center with S-Star Spectroscopy 用s星光谱探测银河系中心的基本恒定振荡

IF 6.4 2区物理与天体物理

Journal of Cosmology and Astroparticle Physics Pub Date : 2026-08-04 DOI: 10.1088/1475-7516/2026/08/005

Zhaoyu Bai, Vitor Cardoso, Yifan Chen, Tuan Do, Aurélien Hees, Huangyu Xiao and Xiao Xue

{"title":"Probing fundamental constant oscillation in the Galactic Center with S-Star Spectroscopy","authors":"Zhaoyu Bai, Vitor Cardoso, Yifan Chen, Tuan Do, Aurélien Hees, Huangyu Xiao and Xiao Xue","doi":"10.1088/1475-7516/2026/08/005","DOIUrl":"https://doi.org/10.1088/1475-7516/2026/08/005","url":null,"abstract":"Astrophysical spectroscopy provides a powerful probe of spacetime variations of fundamental constants, as atomic and ionic emission and absorption lines depend sensitively on the fine-structure constant. In particular, coherent temporal oscillations induced by an ultralight scalar background produce characteristic, time-resolved signatures that can be robustly disentangled from intrinsic variability. In the Galactic Center, such scalar backgrounds can be substantially enhanced, either through the formation of dense scalar clouds powered by black hole rotational energy extraction or as ultralight scalar dark matter forming a soliton-like core. These scalar configurations generically induce oscillations of the fine-structure constant, with periods set by the scalar mass and spatial profiles determined by the scalar wavefunction and its coupling to the electromagnetic sector. We show that precise, time-resolved spectroscopy of S-stars orbiting the supermassive black hole Sgr A^* provides a sensitive test of these effects, enabling constraints on quadratic scalar-photon couplings in the exceptionally high boson-density environment of the Galactic Center.","PeriodicalId":15445,"journal":{"name":"Journal of Cosmology and Astroparticle Physics","volume":"46 1","pages":""},"PeriodicalIF":6.4,"publicationDate":"2026-08-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148675225","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

Testing general relativity with binary black holes: a study on the sensitivity requirements for future space-based detectors 用双黑洞检验广义相对论：对未来天基探测器灵敏度要求的研究

IF 6.4 2区物理与天体物理

Journal of Cosmology and Astroparticle Physics Pub Date : 2026-08-04 DOI: 10.1088/1475-7516/2026/08/006

Tangchao Zhan, Changfu Shi, Shuo Sun and Jianwei Mei

引用次数: 0

The marked power spectrum as a practical bispectrum measure for galaxy redshift surveys 标记功率谱作为一种实用的双光谱测量方法用于星系红移测量

IF 6.4 2区物理与天体物理

Journal of Cosmology and Astroparticle Physics Pub Date : 2026-08-02 DOI: 10.1088/1475-7516/2026/08/003

Haruki Ebina, Martin White and Edmond Chaussidon

{"title":"The marked power spectrum as a practical bispectrum measure for galaxy redshift surveys","authors":"Haruki Ebina, Martin White and Edmond Chaussidon","doi":"10.1088/1475-7516/2026/08/003","DOIUrl":"https://doi.org/10.1088/1475-7516/2026/08/003","url":null,"abstract":"Modern datasets have the precision necessary to uncover new information by including higher-order, non-Gaussian information into cosmological inference. The marked power spectrum offers access to such information while preserving the structure of two-point correlators. This approach to higher-order statistics has the advantage that many modeling questions can directly benefit from progress already made in standard cosmological analyses using the power spectrum and correlation function, while increasing the data vector size negligibly and retaining much of the degeneracy-breaking power of the bispectrum through a particular data compression. In this work, we first restructure the marked power spectrum to isolate its higher-order information and demonstrate its ability to break parameter degeneracies. We then investigate the effect of survey geometry on the marked power spectrum and find that a treatment similar to that of the power spectrum is sufficient. Additionally, we investigate the perturbative modeling and covariance structure of the marked power spectrum, shedding light on its degeneracy breaking power and cross-covariance with the power spectrum. Finally, we demonstrate that the cosmology dependence of the marked power spectrum is smooth, indicating that cosmological inference is possible by modeling the cosmology dependence through interpolation rather than analytical modeling.","PeriodicalId":15445,"journal":{"name":"Journal of Cosmology and Astroparticle Physics","volume":"157 1","pages":""},"PeriodicalIF":6.4,"publicationDate":"2026-08-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148675104","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

Asymptotic theorems and averaging in scalar field cosmology 标量场宇宙学中的渐近定理和平均

IF 6.4 2区物理与天体物理

Journal of Cosmology and Astroparticle Physics Pub Date : 2026-08-02 DOI: 10.1088/1475-7516/2026/08/002

Genly Leon, Aleksander Kozak and Claudio Michea

引用次数: 0

Frequentist cosmological constraints from full-shape clustering measurements in DESI DR1 DESI DR1中全形状聚类测量的频率宇宙学约束

IF 6.4 2区物理与天体物理

Journal of Cosmology and Astroparticle Physics Pub Date : 2026-08-02 DOI: 10.1088/1475-7516/2026/08/001

J. Morawetz, H. Zhang, M. Bonici, W.J. Percival, A. Crespi, J. Aguilar, S. Ahlen, D. Bianchi, D. Brooks, F.J. Castander, T. Claybaugh, S. Cole, A. Cuceu, A. de la Macorra, A. de Mattia, Biprateep Dey, P. Doel, S. Ferraro, A. Font-Ribera, J.E. Forero-Romero, E. Gaztañaga, S.Gontcho A. Gontcho, G. Gutierrez, C. Hahn, K. Honscheid, D. Huterer, M. Ishak, R. Joyce, R. Kehoe, D. Kirkby, T. Kisner, O. Lahav, A. Lambert, M. Landriau, L. Le Guillou, M. Manera, R. Miquel, E. Mueller, S. Nadathur, J.A. Newman, G. Niz, N. Palanque-Delabrouille, F. Prada, I. Pérez-Ràfols, G. Rossi, L. Samushia, E. Sanchez, D. Schlegel, M. Schubnell, J. Silber, D. Sprayberry, G. Tarlé, B.A. Weaver, P. Zarrouk, R. Zhou and H. Zou

{"title":"Frequentist cosmological constraints from full-shape clustering measurements in DESI DR1","authors":"J. Morawetz, H. Zhang, M. Bonici, W.J. Percival, A. Crespi, J. Aguilar, S. Ahlen, D. Bianchi, D. Brooks, F.J. Castander, T. Claybaugh, S. Cole, A. Cuceu, A. de la Macorra, A. de Mattia, Biprateep Dey, P. Doel, S. Ferraro, A. Font-Ribera, J.E. Forero-Romero, E. Gaztañaga, S.Gontcho A. Gontcho, G. Gutierrez, C. Hahn, K. Honscheid, D. Huterer, M. Ishak, R. Joyce, R. Kehoe, D. Kirkby, T. Kisner, O. Lahav, A. Lambert, M. Landriau, L. Le Guillou, M. Manera, R. Miquel, E. Mueller, S. Nadathur, J.A. Newman, G. Niz, N. Palanque-Delabrouille, F. Prada, I. Pérez-Ràfols, G. Rossi, L. Samushia, E. Sanchez, D. Schlegel, M. Schubnell, J. Silber, D. Sprayberry, G. Tarlé, B.A. Weaver, P. Zarrouk, R. Zhou and H. Zou","doi":"10.1088/1475-7516/2026/08/001","DOIUrl":"https://doi.org/10.1088/1475-7516/2026/08/001","url":null,"abstract":"We present a frequentist analysis of clustering measurements from Data Release 1 of the Dark Energy Spectroscopic Instrument (DESI) using the standard profile likelihood method. While Bayesian inferences for effective field theory models of galaxy clustering can be highly sensitive to prior choices for extended cosmological models, frequentist inferences are not susceptible to such effects. We compare frequentist and Bayesian constraints for the parameter set {σ8, H0, Ωm, w0, wa} using the full-shape power spectrum multipoles, post-reconstruction baryon acoustic oscillation (BAO) measurements, and external datasets from the CMB and type Ia supernovae measurements. The frequentist confidence intervals are significantly shifted relative to the Bayesian credible intervals for the w0waCDM model, unless supernovae data are included. When DESI full-shape and BAO data are fit jointly, we obtain the following 1σ frequentist confidence intervals for ΛCDM (w0waCDM): σ8 = 0.863+0.048-0.040, H0 = 68.96+0.81-0.80 km s-1Mpc-1, Ωm = 0.3034 ± 0.0110 (σ8 = 0.782+0.060-0.036, H0 = 63.7+4.2-2.0 km s-1Mpc-1, Ωm = 0.378+0.024-0.047, w0 = -0.16+0.10-0.50, wa = -3.0+1.7), corresponding to 0.8σ, 0.3σ, 0.7σ (2.1σ, 4.1σ, 6.5σ, 6.3σ, 6.6σ) shifts between the maximum likelihood estimate and the Bayesian posterior mean for ΛCDM (w0waCDM) respectively.","PeriodicalId":15445,"journal":{"name":"Journal of Cosmology and Astroparticle Physics","volume":"23 1","pages":""},"PeriodicalIF":6.4,"publicationDate":"2026-08-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148675105","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

Energy conditions in static, spherically symmetric spacetimes and effective geometries 静态、球对称时空和有效几何中的能量条件

IF 6.4 2区物理与天体物理

Journal of Cosmology and Astroparticle Physics Pub Date : 2026-07-30 DOI: 10.1088/1475-7516/2026/07/106

Zi-Liang Wang and Emmanuele Battista

引用次数: 0

Cosmic homogeneity: the effect of redshift-space distortions and bias and cosmological constraints 宇宙均匀性：红移空间扭曲和偏差的影响以及宇宙学约束

IF 6.4 2区物理与天体物理

Journal of Cosmology and Astroparticle Physics Pub Date : 2026-07-30 DOI: 10.1088/1475-7516/2026/07/107

Xiaoyun Shao, Rodrigo Gonçalves, Carlos A.P. Bengaly, Gabriela C. Carvalho and Jailson Alcaniz

{"title":"Cosmic homogeneity: the effect of redshift-space distortions and bias and cosmological constraints","authors":"Xiaoyun Shao, Rodrigo Gonçalves, Carlos A.P. Bengaly, Gabriela C. Carvalho and Jailson Alcaniz","doi":"10.1088/1475-7516/2026/07/107","DOIUrl":"https://doi.org/10.1088/1475-7516/2026/07/107","url":null,"abstract":"We present a novel cosmological analysis based on the angular correlation dimension D2 curve, a cumulative statistic derived from the two-point correlation function. Unlike traditional 3D approaches, angular D2 is inherently less sensitive to nonlinear dynamical distortions, such as the small-scale Finger-of-God (FoG) effect. Using both MultiDark-Patchy and EZmock galaxy catalogs, we assess the scale-dependent impact of redshift-space distortions on D2 and bias measurements. We demonstrate that the systematic errors associated with FoG modeling can be significantly reduced by restricting the analysis to appropriate minimum comoving angular scales of ∼ 1.25°, which corresponding to physical scales of 18–23 h-1 Mpc over the redshift range 0.46 ≤ z ≤ 0.74 within the standard ΛCDM model. Since the observational estimative of D2(θ) is not dependent on a cosmological model we obtain robust estimates of the galaxy bias and place competitive constraints on the physical matter density ωm. By applying this framework to SDSS DR12 and DR16 Luminous Red Galaxy data, we obtain ωm = 0.137+0.041-0.059 (1σ), which agrees with current CMB analyses. Our results highlight the potential of the angular D2 curve as a model-independent and robust tool for cosmological parameter inference.","PeriodicalId":15445,"journal":{"name":"Journal of Cosmology and Astroparticle Physics","volume":"15 1","pages":""},"PeriodicalIF":6.4,"publicationDate":"2026-07-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148624069","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

Modeling redshift uncertainties in Roman weak lensing cosmology 罗马弱透镜宇宙学中的红移不确定度建模

IF 6.4 2区物理与天体物理

Journal of Cosmology and Astroparticle Physics Pub Date : 2026-07-28 DOI: 10.1088/1475-7516/2026/07/105

Diogo H.F. de Souza, Boyan Yin, Tim Eifler, Vivian Miranda, Chun-Hao To, Brett H. Andrews, Katarina Markovič, Eric Huff, Michael A. Troxel and Olivier Doré

{"title":"Modeling redshift uncertainties in Roman weak lensing cosmology","authors":"Diogo H.F. de Souza, Boyan Yin, Tim Eifler, Vivian Miranda, Chun-Hao To, Brett H. Andrews, Katarina Markovič, Eric Huff, Michael A. Troxel and Olivier Doré","doi":"10.1088/1475-7516/2026/07/105","DOIUrl":"https://doi.org/10.1088/1475-7516/2026/07/105","url":null,"abstract":"Cosmological constraints using weak gravitational lensing measurements from the Roman Space Telescope will require a powerful method for modelling uncertainties in the galaxy redshift distribution. In this work, we use an optimized version of the principal component analysis (PCA) to model uncertainties in the full shape of the redshift distributions, a method proposed by [1] and recently used in the Dark Energy Survey Y6 analysis. Here, we implement this new approach within the Roman High Latitude Imaging Survey (HLIS) Cosmology Project Infrastructure Team (PIT) pipeline, namely Cobaya-Cosmolike Joint Architecture (CoCoA). To validate the PCA in mitigating biases on cosmological parameters, S8 and Ωm, we use a set of redshift distributions from Cardinal generated for a variety of Roman configurations. Overall, when the simulated cosmic shear data vector is not strongly miscalibrated relative to the fiducial one, both the mean-shift and the PCA-based approaches produce consistent cosmological constraints when marginalizing over nuisance parameters. For mild to strong miscalibration, including additional PCs progressively mitigates biases in S8 and Ωm, and can achieve comparable performance with fewer parameters than the nine tomographic-bin mean-shift model.","PeriodicalId":15445,"journal":{"name":"Journal of Cosmology and Astroparticle Physics","volume":"29 1","pages":""},"PeriodicalIF":6.4,"publicationDate":"2026-07-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148596436","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

Continuous sensitivity analysis for δN formalism δN形式的连续灵敏度分析

IF 6.4 2区物理与天体物理

Journal of Cosmology and Astroparticle Physics Pub Date : 2026-07-27 DOI: 10.1088/1475-7516/2026/07/103

S. Mohammad Ahmadi

{"title":"Continuous sensitivity analysis for δN formalism","authors":"S. Mohammad Ahmadi","doi":"10.1088/1475-7516/2026/07/103","DOIUrl":"https://doi.org/10.1088/1475-7516/2026/07/103","url":null,"abstract":"The δN formalism provides a powerful non-perturbative framework for following the evolution of primordial curvature perturbations on super-horizon scales. However, its standard implementation relies on the separate universe assumption, which neglects significant spatial gradient interactions. Recent work has addressed this limitation by incorporating gradient interactions directly into the background dynamics through an effective source term in the Klein-Gordon equation, thereby extending the applicability of the δN framework beyond the separate universe approximation. Despite this conceptual progress, practical calculations within the δN formalism remain technically challenging, as cosmological observables require evaluating the sensitivity of the total number of e-folds to initial conditions, a task that becomes even more involved once gradient contributions are included. In this work, we develop a systematic method to simplify these calculations by applying Continuous Sensitivity Analysis to the gradient-corrected δN framework. In this approach, the required phase-space derivatives are obtained by solving a set of coupled first-order differential equations for the field Jacobian and Hessian, which significantly streamlines both analytical and numerical evaluations of the δN formalism. As an explicit demonstration, we apply the method to the Starobinsky model, which features a sharp transition into an ultra-slow-roll phase. Within this setup, we derive analytical expressions for the k-dependent power spectrum including full gradient corrections, and obtain an analytical estimate of the equilateral non-Gaussianity parameter fNLeq that accurately captures the main non-Gaussian features.","PeriodicalId":15445,"journal":{"name":"Journal of Cosmology and Astroparticle Physics","volume":"24 1","pages":""},"PeriodicalIF":6.4,"publicationDate":"2026-07-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148595612","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

Constraining dark photon dark matter with radio silence from soliton mergers around supermassive black holes 从超大质量黑洞周围的孤子合并用无线电沉默约束暗光子暗物质

IF 6.4 2区物理与天体物理

Journal of Cosmology and Astroparticle Physics Pub Date : 2026-07-27 DOI: 10.1088/1475-7516/2026/07/104

Dorian W.P. Amaral, Enrico D. Schiappacasse and Hong-Yi Zhang

{"title":"Constraining dark photon dark matter with radio silence from soliton mergers around supermassive black holes","authors":"Dorian W.P. Amaral, Enrico D. Schiappacasse and Hong-Yi Zhang","doi":"10.1088/1475-7516/2026/07/104","DOIUrl":"https://doi.org/10.1088/1475-7516/2026/07/104","url":null,"abstract":"We place the first constraints on the dark matter fraction contained within dark photon solitons using the absence of their predicted radio-frequency signatures, or radio silence, following mergers around supermassive black holes. In these dense environments, spiky dark matter density profiles can form that enhance the soliton merger rate. We present a novel estimate of this rate by incorporating both the steepened dark matter profile and the soliton velocity dispersion via the Jeans equation. For galaxies with an initial profile ρDM ∝ r-1, we find the total merger rate across redshifts 0 ≤ z ≤ 4 to be ΓTOTALmerg ≲ 10-7f2DM Mpc-3 day-1, where fDM is the solitonic fraction of dark matter. This enhanced rate leads to more major merger events in which the generated soliton has a mass exceeding a critical threshold, leading to its decay via the parametric resonance phenomenon that produces brief, narrowband, and energetic radio bursts detectable by fast radio burst surveys. Comparing our predictions with the non-observation of such events, we already obtain fDM ≲ 10-1 from the first fast radio burst study. This constraint is strengthened to fDM ≲ 10-2 from the Parkes HTRU survey, with CHIME projected to tighten this to fDM ≲ 10-3. For larger fDM, we instead constrain the effective coupling strength between the dark and visible sectors to lie outside 10-18 GeV-1 ≲ g ≲ 10-8 GeV-1 for dark photon masses in the range 10-6 eV ≲ m ≲ 10-4 eV. Our results establish astrophysical transients as powerful probes of dark sectors, opening a window onto the detectability of ultralight vector fields.","PeriodicalId":15445,"journal":{"name":"Journal of Cosmology and Astroparticle Physics","volume":"35 1","pages":""},"PeriodicalIF":6.4,"publicationDate":"2026-07-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148595613","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