Journal of Cosmology and Astroparticle Physics最新文献_第9页

Universal gravitational wave signatures of cosmological solitons 宇宙孤子的普遍引力波特征

IF 6.4 2区物理与天体物理

Journal of Cosmology and Astroparticle Physics Pub Date : 2025-01-21 DOI: 10.1088/1475-7516/2025/01/094

Kaloian D. Lozanov, Misao Sasaki and Volodymyr Takhistov

引用次数: 0

Field-level simulation-based inference with galaxy catalogs: the impact of systematic effects 基于星系表的场级模拟推断：系统效应的影响

IF 6.4 2区物理与天体物理

Journal of Cosmology and Astroparticle Physics Pub Date : 2025-01-21 DOI: 10.1088/1475-7516/2025/01/082

Natalí S.M. de Santi, Francisco Villaescusa-Navarro, L. Raul Abramo, Helen Shao, Lucia A. Perez, Tiago Castro, Yueying Ni, Christopher C. Lovell, Elena Hernández-Martínez, Federico Marinacci, David N. Spergel, Klaus Dolag, Lars Hernquist and Mark Vogelsberger

{"title":"Field-level simulation-based inference with galaxy catalogs: the impact of systematic effects","authors":"Natalí S.M. de Santi, Francisco Villaescusa-Navarro, L. Raul Abramo, Helen Shao, Lucia A. Perez, Tiago Castro, Yueying Ni, Christopher C. Lovell, Elena Hernández-Martínez, Federico Marinacci, David N. Spergel, Klaus Dolag, Lars Hernquist and Mark Vogelsberger","doi":"10.1088/1475-7516/2025/01/082","DOIUrl":"https://doi.org/10.1088/1475-7516/2025/01/082","url":null,"abstract":"It has been recently shown that a powerful way to constrain cosmological parameters from galaxy redshift surveys is to train graph neural networks to perform field-level likelihood-free inference without imposing cuts on scale. In particular, de Santi et al. [58] developed models that could accurately infer the value of Ωm from catalogs that only contain the positions and radial velocities of galaxies that are robust to different astrophysics and subgrid models. However, observations are affected by many effects, including (1) masking, (2) uncertainties in peculiar velocities and radial distances, and (3) different galaxy population selections. Moreover, observations only allow us to measure redshift, which entangles the galaxy radial positions and velocities. In this paper we train and test our models on galaxy catalogs, created from thousands of state-of-the-art hydrodynamic simulations run with different codes from the CAMELS project, that incorporate these observational effects. We find that while such effects degrade the precision and accuracy of the models, the fraction of galaxy catalogs for which the models retain high performance and robustness is over 90%, demonstrating the potential for applying them to real data.","PeriodicalId":15445,"journal":{"name":"Journal of Cosmology and Astroparticle Physics","volume":"32 1","pages":""},"PeriodicalIF":6.4,"publicationDate":"2025-01-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142992268","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

High-redshift cosmography with a possible cosmic distance duality relation violation 可能违反宇宙距离对偶关系的高红移宇宙学

IF 6.4 2区物理与天体物理

Journal of Cosmology and Astroparticle Physics Pub Date : 2025-01-21 DOI: 10.1088/1475-7516/2025/01/088

José F. Jesus, Mikael J.S. Gomes, Rodrigo F.L. Holanda and Rafael C. Nunes

{"title":"High-redshift cosmography with a possible cosmic distance duality relation violation","authors":"José F. Jesus, Mikael J.S. Gomes, Rodrigo F.L. Holanda and Rafael C. Nunes","doi":"10.1088/1475-7516/2025/01/088","DOIUrl":"https://doi.org/10.1088/1475-7516/2025/01/088","url":null,"abstract":"In this study, we used geometric distances at high redshifts (both luminosity and angular) to perform a cosmographic analysis with the Padé method, which stabilizes the behaviour of the cosmographic series in this redshift regime. However, in our analyses, we did not assume the validity of the Cosmic Distance Duality Relation (CDDR), but allowed for potential violations, such as dL(z) = η(z)(1+z)2dA(z), where three different functional forms of η(z) are considered. By incorporating updated data from supernovae (SN), baryon acoustic oscillations (BAO), and cosmic chronometers (CC), we obtained observational constraints on cosmographic models alongside possible CDDR violations. Interestingly, we found that potential CDDR violations introduce new statistical correlations among cosmographic parameters such as H0, q0, and j0. Nonetheless, within this framework, we did not observe significant deviations from the CDDR, and our results remain consistent with the predictions of the ΛCDM model. In the same time, this work provides a novel and straightforward method for testing the CDDR by fixing the background evolution through cosmographic techniques, paving the way for new geometric observational tests of possible deviations from standard cosmology.","PeriodicalId":15445,"journal":{"name":"Journal of Cosmology and Astroparticle Physics","volume":"205 1","pages":""},"PeriodicalIF":6.4,"publicationDate":"2025-01-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142992316","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

Prospects for cosmological research with the FAST array: 21-cm intensity mapping survey observation strategies FAST阵列宇宙学研究展望：21厘米强度测绘巡天观测策略

IF 6.4 2区物理与天体物理

Journal of Cosmology and Astroparticle Physics Pub Date : 2025-01-21 DOI: 10.1088/1475-7516/2025/01/080

Jun-Da Pan, Peng-Ju Wu, Guo-Hong Du, Yichao Li and Xin Zhang

{"title":"Prospects for cosmological research with the FAST array: 21-cm intensity mapping survey observation strategies","authors":"Jun-Da Pan, Peng-Ju Wu, Guo-Hong Du, Yichao Li and Xin Zhang","doi":"10.1088/1475-7516/2025/01/080","DOIUrl":"https://doi.org/10.1088/1475-7516/2025/01/080","url":null,"abstract":"Precise cosmological measurements are essential for understanding the evolution of the universe and the nature of dark energy. The Five-hundred-meter Aperture Spherical Telescope (FAST), the most sensitive single-dish radio telescope, has the potential to provide the precise cosmological measurements through neutral hydrogen 21 cm intensity mapping sky survey. This paper primarily explores the potential of technological upgrades for FAST in cosmology. The most crucial upgrade begins with equipping FAST with a wide-band receiver (0 < z < 2.5). This upgrade can enable FAST to achieve higher precision in cosmological parameter estimation than the Square Kilometre Array Phase 1 Mid-Frequency Array. On this basis, expanding to a FAST array (FASTA) consisting of six identical FASTs would offer significant improvements in precision compared to FAST. Additionally, compared with the current results from the data combination of cosmic microwave background, baryon acoustic oscillations (optical galaxy surveys), and type Ia supernovae, FASTA can provide comparable constraints. Specifically, for the dark-energy equation-of-state parameters, FASTA can achieve σ(w0) = 0.09 and σ(wa) = 0.33.","PeriodicalId":15445,"journal":{"name":"Journal of Cosmology and Astroparticle Physics","volume":"11 1","pages":""},"PeriodicalIF":6.4,"publicationDate":"2025-01-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142992267","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

Hot Casimir wormholes 热卡西米尔虫洞

IF 6.4 2区物理与天体物理

Journal of Cosmology and Astroparticle Physics Pub Date : 2025-01-21 DOI: 10.1088/1475-7516/2025/01/081

Remo Garattini and Mir Faizal

引用次数: 0

Stellar-mass black-hole binaries in LISA: characteristics and complementarity with current-generation interferometers LISA中的恒星质量黑洞双星：特征和与当前一代干涉仪的互补

IF 6.4 2区物理与天体物理

Journal of Cosmology and Astroparticle Physics Pub Date : 2025-01-21 DOI: 10.1088/1475-7516/2025/01/084

R. Buscicchio, J. Torrado, C. Caprini, G. Nardini, N. Karnesis, M. Pieroni and A. Sesana

{"title":"Stellar-mass black-hole binaries in LISA: characteristics and complementarity with current-generation interferometers","authors":"R. Buscicchio, J. Torrado, C. Caprini, G. Nardini, N. Karnesis, M. Pieroni and A. Sesana","doi":"10.1088/1475-7516/2025/01/084","DOIUrl":"https://doi.org/10.1088/1475-7516/2025/01/084","url":null,"abstract":"Stellar-mass black-hole binaries are the most numerous gravitational-wave sources observed to date. Their properties make them suitable for observation both by ground- and space-based detectors. Starting from synthetic catalogues constructed based on observational constraints from ground-based detectors, we explore the detection rates and the characteristic parameters of the stellar-mass black-hole binaries observable by LISA during their inspiral, using signal-to-noise ratio thresholds as a detection criterion. We find that only a handful of these sources will be detectable with signal-to-noise ratio larger than 8: about 5 sources on average in 4 years of mission duration, among which only one or two are multiband ones (i.e. merging in less than 15 years). We find that detectable sources have chirp mass 10 M⊙ ≲ ℳc ≲ 100 M⊙, residual time-to-coalescence 4 yr ≲ τc ≲ 100 yr, and redshift z ≲ 0.1, much closer than those observed up to now by ground-based detectors. We also explore correlations between the number of LISA detectable sources and the parameters of the population, suggesting that a joint measurement with the stochastic signal might be informative of the population characteristics. By performing parameter estimation on a subset of sources from the catalogues, we conclude that, even if LISA measurements will not be directly informative on the population due to the low number of resolvable sources, it will characterise a few, low-redshift candidates with great precision. Furthermore, we construct for the first time the LISA waterfall plot for low chirp-mass systems, as a function of their time to coalescence and inclination. We demonstrate that LISA will also be able to discriminate and characterize, through very precise parameter estimation, a population of binaries with higher masses, ℳc ∼ 𝒪(103) M⊙, at the boundary of ground-based detectors sensitivity.","PeriodicalId":15445,"journal":{"name":"Journal of Cosmology and Astroparticle Physics","volume":"103 1","pages":""},"PeriodicalIF":6.4,"publicationDate":"2025-01-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142992313","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 primordial magnetic fields through 21-cm physics: bounds and forecasts 通过21厘米物理重新审视原始磁场：界限和预测

IF 6.4 2区物理与天体物理

Journal of Cosmology and Astroparticle Physics Pub Date : 2025-01-21 DOI: 10.1088/1475-7516/2025/01/089

Arko Bhaumik, Debarun Paul and Supratik Pal

{"title":"Revisiting primordial magnetic fields through 21-cm physics: bounds and forecasts","authors":"Arko Bhaumik, Debarun Paul and Supratik Pal","doi":"10.1088/1475-7516/2025/01/089","DOIUrl":"https://doi.org/10.1088/1475-7516/2025/01/089","url":null,"abstract":"Primordial magnetic fields (PMFs) may significantly influence 21-cm physics via two mechanisms: (i) magnetic heating of the intergalactic medium (IGM) through ambipolar diffusion (AD) and decaying magnetohydrodynamic turbulence (DT), (ii) impact on the star formation rate density (SFRD) through small-scale enhancement of the matter power spectrum. In this analysis, we integrate both of these effects within a unified analytical framework and use it to determine upper bounds on the parameter space of a nearly scale-invariant non-helical PMF in the light of the global 21-cm signal observed by EDGES. Our findings reveal that the joint consideration of both effects furnishes constraints of the order B0 ≲ 𝒪(10-2) nG on the present-day magnetic field strength, which are considerably tighter compared to earlier analyses. We subsequently explore the prospects of detecting such a magnetized 21-cm power spectrum at the upcoming SKA-Low mission. For the relevant parameters of the PMF (B0 and nB) and the excess radio background (ξ), SNR estimation and Fisher forecast analysis indicate that it may be possible to constrain these three parameters with relative 1σ uncertainties ≲ 10% and an associated SNR ≳10 at SKA-Low. This also leads to possible correlations among these three parameters, thus revealing intriguing trends of interplay among the various physical processes involved.","PeriodicalId":15445,"journal":{"name":"Journal of Cosmology and Astroparticle Physics","volume":"38 1","pages":""},"PeriodicalIF":6.4,"publicationDate":"2025-01-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142992317","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

Ultra-light dark matter with non-canonical kinetics reopening the mass window 具有非规范动力学的超轻暗物质重新打开了质量窗口

IF 6.4 2区物理与天体物理

Journal of Cosmology and Astroparticle Physics Pub Date : 2025-01-21 DOI: 10.1088/1475-7516/2025/01/086

Shiyun Lu, Amara Ilyas, Xiao-Han Ma, Bo Wang, Dongdong Zhang and Yi-Fu Cai

引用次数: 0

Inflation with the Chern-Simons term in the Palatini formulation 用帕拉蒂尼公式中的陈-西蒙斯项的暴胀

IF 6.4 2区物理与天体物理

Journal of Cosmology and Astroparticle Physics Pub Date : 2025-01-21 DOI: 10.1088/1475-7516/2025/01/087

Ali Hassan and Syksy Räsänen

引用次数: 0

Hamiltonian formalism for cosmological perturbations: fixing the gauge 宇宙学微扰的哈密顿形式论：固定规范

IF 6.4 2区物理与天体物理

Journal of Cosmology and Astroparticle Physics Pub Date : 2025-01-21 DOI: 10.1088/1475-7516/2025/01/083

Danilo Artigas, Julien Grain and Vincent Vennin

{"title":"Hamiltonian formalism for cosmological perturbations: fixing the gauge","authors":"Danilo Artigas, Julien Grain and Vincent Vennin","doi":"10.1088/1475-7516/2025/01/083","DOIUrl":"https://doi.org/10.1088/1475-7516/2025/01/083","url":null,"abstract":"Cosmological perturbation theory is an example of a gauge theory, where gauge transformations correspond to changes in the space-time coordinate system. To determine physical quantities, one is free to introduce gauge conditions (i.e. to work with specific space-time coordinates), and such conditions are often used to simplify technical aspects of the calculation or to facilitate the interpretation of the physical degrees of freedom. Some of the prescriptions introduced in the literature are known to fix the gauge only partially, but it is commonly assumed that the remaining gauge degrees of freedom can be fixed somehow. In this work, we show that this is not necessarily the case, and that some of these gauges are indeed pathological. We derive a systematic procedure to determine whether a gauge is pathological or not, and to complete partially-fixed gauges into healthy gauges when this is possible. In this approach, the Lagrange multipliers (i.e. the perturbed lapse and shift in the ADM formalism) cannot appear in the off-shell definition of the gauges, they necessarily arise as on-shell consequences of the gauge conditions. As illustrative applications, we propose an alternative, non-pathological formulation of the synchronous gauge, and we show that the uniform-expansion gauge (as well as any gauge ensuring vanishing lapse perturbations) can hardly be made healthy. Our methodology also allows us to construct all gauge-invariant variables. We further show that our non-pathological criterion for gauges is also the one that ensures Dirac brackets to be properly defined. This allows cosmological perturbations to be quantised in a gauge-fixed way. We finally discuss possible generalisations of our formalism.","PeriodicalId":15445,"journal":{"name":"Journal of Cosmology and Astroparticle Physics","volume":"6 1","pages":""},"PeriodicalIF":6.4,"publicationDate":"2025-01-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142991441","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