Journal of Cosmology and Astroparticle Physics最新文献_第3页

Cosmological consequences of varying couplings in gravity action 引力作用中不同耦合的宇宙学结果

IF 6.4 2区物理与天体物理

Journal of Cosmology and Astroparticle Physics Pub Date : 2025-10-13 DOI: 10.1088/1475-7516/2025/10/048

Sandipan Sengupta

引用次数: 0

From kinetic gases to an exponentially expanding universe — the Finsler-Friedmann equation 从动能气体到指数膨胀的宇宙——芬斯勒-弗里德曼方程

IF 6.4 2区物理与天体物理

Journal of Cosmology and Astroparticle Physics Pub Date : 2025-10-13 DOI: 10.1088/1475-7516/2025/10/050

Christian Pfeifer, Nicoleta Voicu, Annamária Friedl-Szász and Elena Popovici-Popescu

{"title":"From kinetic gases to an exponentially expanding universe — the Finsler-Friedmann equation","authors":"Christian Pfeifer, Nicoleta Voicu, Annamária Friedl-Szász and Elena Popovici-Popescu","doi":"10.1088/1475-7516/2025/10/050","DOIUrl":"https://doi.org/10.1088/1475-7516/2025/10/050","url":null,"abstract":"We investigate the gravitational field of a kinetic gas beyond its standard derivation from the second moment of the one-particle distribution function (1PDF), which typically serves as the energy-momentum tensor in the Einstein equations. This standard procedure raises an important question: why do the other moments of the 1PDF (which are needed to fully characterize the kinematical properties of the gas) not contribute to the gravitational field? Moreover, could these moments be relevant in addressing the dark energy problem? Using the canonical coupling of the full 1PDF to Finsler spacetime geometry via the Finsler gravity equation, we show that in general all moments contribute non-trivially. We derive the Finsler gravity equation in homogeneous and isotropic symmetry in conformal time — dubbed the Finsler-Friedmann equation — which determines both the scale factor and the causal structure dynamically. Remarkably, this equation naturally admits a vacuum solution describing an exponentially expanding spacetime, without requiring a cosmological constant or any additional quantities. The resulting causal structure is a mild deformation of the one of Friedmann-Lemaître-Robertson-Walker (FLRW) geometry; close to the rest frame defined by cosmological time (i.e. for slowly moving objects), the causal structures of the two geometries are nearly indistinguishable.","PeriodicalId":15445,"journal":{"name":"Journal of Cosmology and Astroparticle Physics","volume":"11 1","pages":""},"PeriodicalIF":6.4,"publicationDate":"2025-10-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145282902","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

Stupendously large primordial black holes from the QCD axion 巨大的原始黑洞来自QCD轴子

IF 6.4 2区物理与天体物理

Journal of Cosmology and Astroparticle Physics Pub Date : 2025-10-13 DOI: 10.1088/1475-7516/2025/10/055

Miguel Faria, Ricardo Z. Ferreira and Fabrizio Rompineve

{"title":"Stupendously large primordial black holes from the QCD axion","authors":"Miguel Faria, Ricardo Z. Ferreira and Fabrizio Rompineve","doi":"10.1088/1475-7516/2025/10/055","DOIUrl":"https://doi.org/10.1088/1475-7516/2025/10/055","url":null,"abstract":"The inflationary diffusion of (pseudo-)scalar fields with discrete symmetries can seed the formation of a gas of closed domain walls after inflation, when the distance between degenerate minima in field space is not too far from the inflationary Hubble scale. Primordial black holes (PBHs) can then be formed once sufficiently heavy domain walls re-enter the Hubble sphere. In this scenario, inflation determines a distinctive PBH mass distribution that is rather flat and can thus lead to a sizable total abundance of PBHs, while avoiding some of the downsides of PBH formation from critical collapse. We show that generic QCD axion models, with decay constant close to the inflationary Hubble scale, can yield up to 1% of the dark matter (DM) today in the form of PBHs, while being compatible with isocurvature constraints from Cosmic Microwave Background observations. This occurs for values of axion decay constants around fa ≃ 108 GeV, that is the region targeted by axion helioscopes and partially constrained by astrophysical observations. The resulting PBHs have stupendously large masses, above 1011M⊙, and their existence can be probed by Large Scale Structure observations. Larger PBH abundances can be generated by axion-like particles. Alternatively, in scenarios where isocurvature constraints can be relaxed, we find that the totality of the DM can be produced by the QCD axion misalignment mechanism, accompanied by a 𝒪(10-3) DM fraction in PBHs of masses (105-106) M⊙. These can act as seeds for the formation of massive black holes at large redshifts, as suggested by recent JWST observations.","PeriodicalId":15445,"journal":{"name":"Journal of Cosmology and Astroparticle Physics","volume":"13 1","pages":""},"PeriodicalIF":6.4,"publicationDate":"2025-10-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145282941","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

Scrutinizing the impact of the solar modulation on AMS-02 antiproton excess 太阳调制对AMS-02反质子过剩的影响

IF 6.4 2区物理与天体物理

Journal of Cosmology and Astroparticle Physics Pub Date : 2025-10-13 DOI: 10.1088/1475-7516/2025/10/049

Kai-Kai Duan, Xiao Wang, Wen-Hao Li, Zhi-Hui Xu, Yue-Lin Sming Tsai and Yi-Zhong Fan

{"title":"Scrutinizing the impact of the solar modulation on AMS-02 antiproton excess","authors":"Kai-Kai Duan, Xiao Wang, Wen-Hao Li, Zhi-Hui Xu, Yue-Lin Sming Tsai and Yi-Zhong Fan","doi":"10.1088/1475-7516/2025/10/049","DOIUrl":"https://doi.org/10.1088/1475-7516/2025/10/049","url":null,"abstract":"This study examines the impact of solar modulation on the antiproton excess observed by AMS-02, which may indicate dark matter (DM) annihilation. We analyze three solar modulation models: the force-field approximation (FFA), a time-, charge-, and rigidity-dependent FFA, and a three-dimensional numerical simulation based on the Parker transport equation. Based on AMS-02 latest antiproton data (2025), our results show that the significance of the DM signal is sensitive to the chosen modulation model, with a 2σ signal for the FFA (4σ if including data from H, He, C, O, B/C, and B/O) and a reduced significance for more complex models. We also address systematic uncertainties using two methods: the add-in-quadrature method, which assumes uncorrelated uncertainties between energy bins, and the nuisance parameter method, which treats systematic uncertainties as nuisance parameters during the fitting process. Fitted to AMS-02 antiproton data, DM annihilation to the bb̅ scenario with three different solar modulation models shows that the add-in-quadrature method causes overfitting, whereas the nuisance parameters approach leads to underfitting. Statistically, the signal region of the FFA model using the add-in-quadrature method is the most reliable. This work highlights the need for refined solar modulation models and a better treatment of uncertainties for a conclusive interpretation of the AMS-02 data.","PeriodicalId":15445,"journal":{"name":"Journal of Cosmology and Astroparticle Physics","volume":"40 1","pages":""},"PeriodicalIF":6.4,"publicationDate":"2025-10-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145282940","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

Non-linear reconstruction of general dark energy theories 广义暗能量理论的非线性重构

IF 6.4 2区物理与天体物理

Journal of Cosmology and Astroparticle Physics Pub Date : 2025-10-13 DOI: 10.1088/1475-7516/2025/10/057

Yunhao Gao, Baojiu Li and Jie Wang

{"title":"Non-linear reconstruction of general dark energy theories","authors":"Yunhao Gao, Baojiu Li and Jie Wang","doi":"10.1088/1475-7516/2025/10/057","DOIUrl":"https://doi.org/10.1088/1475-7516/2025/10/057","url":null,"abstract":"The large variety and number of dark energy (DE) theories make it impractical to perform detailed analyses on a case-by-case basis, which has motivated proposals to “parameterize” theories to reduce the size of theory space. The leading approach to do this is the effective field theory of dark energy (EFTofDE), which can describe general Horndeski-type theories with a small number of observationally accessible time-dependent functions. However, the EFTofDE primarily works for linear perturbations, and extending it to obtain a fully non-linear description of DE theories, which is critical for theories with screening mechanisms, is challenging. In this paper, we present a general method for reconstructing the non-linear DE Lagrangian from the background expansion history and certain linear-perturbation quantities, building upon the EFTofDE framework. Using numerical examples, we demonstrate that this method is applicable to a wide range of single-scalar-field dark energy and modified gravity theories, including quintessence, scalar-tensor theory, k-essence, and generalized cubic Galileon with shift symmetry. For each of these theories, we discuss the validity of the method and factors affecting its results. While this method involves solving differential equations, we find that the initial conditions are not important for quintessence, scalar-tensor theory and k-essence, while for shift-symmetric cubic Galileon, the generic tracker solution can help transform differential equations into algebraic equations. This offers a useful framework to connect cosmological observations at the background and linear-perturbation levels to the underlying non-linear dynamics of dark energy, and will enable cosmological simulations to analyze and examine DE theories systematically and in much greater detail.","PeriodicalId":15445,"journal":{"name":"Journal of Cosmology and Astroparticle Physics","volume":"209 1","pages":""},"PeriodicalIF":6.4,"publicationDate":"2025-10-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145282943","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

Dark Matter EFT landscape probed by QUEST-DMC 由QUEST-DMC探测的暗物质景观

IF 6.4 2区物理与天体物理

Journal of Cosmology and Astroparticle Physics Pub Date : 2025-10-09 DOI: 10.1088/1475-7516/2025/10/044

N. Darvishi, S. Autti, L. Bloomfield, A. Casey, N. Eng, P. Franchini, R.P. Haley, P.J. Heikkinen, A. Jennings, A. Kemp, E. Leason, J. March-Russell, A. Mayer, J. Monroe, D. Münstermann, M.T. Noble, J.R. Prance, X. Rojas, T. Salmon, J. Saunders, J. Smirnov, R. Smith, M.D. Thompson, A. Thomson, A. Ting, V. Tsepelin, S.M. West, L. Whitehead, D.E. Zmeev and The QUEST-DMC collaboration

{"title":"Dark Matter EFT landscape probed by QUEST-DMC","authors":"N. Darvishi, S. Autti, L. Bloomfield, A. Casey, N. Eng, P. Franchini, R.P. Haley, P.J. Heikkinen, A. Jennings, A. Kemp, E. Leason, J. March-Russell, A. Mayer, J. Monroe, D. Münstermann, M.T. Noble, J.R. Prance, X. Rojas, T. Salmon, J. Saunders, J. Smirnov, R. Smith, M.D. Thompson, A. Thomson, A. Ting, V. Tsepelin, S.M. West, L. Whitehead, D.E. Zmeev and The QUEST-DMC collaboration","doi":"10.1088/1475-7516/2025/10/044","DOIUrl":"https://doi.org/10.1088/1475-7516/2025/10/044","url":null,"abstract":"We present the projected sensitivity to non-relativistic Effective Field Theory (EFT) operators for dark matter (DM) direct detection using the QUEST-DMC experiment. QUEST-DMC employs superfluid Helium-3 as a target medium and measures energy deposition via nanomechanical resonators with SQUID-based readout to probe DM interactions. The experiment aims to explore new parameter space in the sub-GeV mass range, probing light DM and a broad range of interaction models. We analyse the sensitivity to a complete set of fourteen independent non-relativistic EFT operators, each parameterised by a Wilson coefficient that quantifies the strength of DM interactions with Standard Model particles. For each interaction channel, we determine the corresponding sensitivity ceiling due to attenuation of the DM flux incident on the detector, caused by DM scattering in the Earth and atmosphere. As a key component of this analysis, we provide the mapping between the non-relativistic EFT operators and the relativistic bilinear DM-nucleon interactions, and assess the interaction sensitivity to sub-GeV DM in the QUEST-DMC detector. Our findings demonstrate that QUEST-DMC provides a unique probe of DM interactions, particularly in previously unexplored parameter space for momentum- and velocity-dependent interactions, thereby expanding the search for viable DM candidates beyond traditional weakly interacting massive particles.","PeriodicalId":15445,"journal":{"name":"Journal of Cosmology and Astroparticle Physics","volume":"121 1","pages":""},"PeriodicalIF":6.4,"publicationDate":"2025-10-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145255604","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

Post-inflationary enhancement of adiabatic perturbations in modular cosmology 模宇宙学中绝热扰动的暴胀后增强

IF 6.4 2区物理与天体物理

Journal of Cosmology and Astroparticle Physics Pub Date : 2025-10-09 DOI: 10.1088/1475-7516/2025/10/045

Rodrigo Gonzalez Quaglia, Martino Michelotti, Diederik Roest, John Joseph Carrasco, Renata Kallosh and Andrei Linde

引用次数: 0

Probing Dark Matter-electron interactions in the Cosmic Microwave Background Radiation 探测宇宙微波背景辐射中的暗物质-电子相互作用

IF 6.4 2区物理与天体物理

Journal of Cosmology and Astroparticle Physics Pub Date : 2025-10-09 DOI: 10.1088/1475-7516/2025/10/046

Rahul Dhyani, Arnab Paul and Arindam Chatterjee

{"title":"Probing Dark Matter-electron interactions in the Cosmic Microwave Background Radiation","authors":"Rahul Dhyani, Arnab Paul and Arindam Chatterjee","doi":"10.1088/1475-7516/2025/10/046","DOIUrl":"https://doi.org/10.1088/1475-7516/2025/10/046","url":null,"abstract":"In this article, we consider Dark Matter (DM) interactions and study the same in the light of the Cosmic Microwave Background Radiation (CMBR) data. In particular, we focus on the DM-electron interactions. Assuming that such interactions are mediated by rather heavy mediators, we consider effective operators describing the relevant interaction terms in the lagrangian. The presence of such interaction terms leads to both DM annihilation and DM-electron scattering (drag). We focus on operators which lead to velocity-independent DM annihilation and DM-electron scattering cross-sections. Using the CMBR data, we study the implications of both of these effects imposing constraints on the respective effective operators. This analysis underscores the importance of taking both scattering and annihilation processes into consideration in the study of DM interactions. We observe that the constraints on the DM annihilation and scattering cross-sections can change, up to about 13% and 12%, respectively, for the benchmark scenarios we considered, depending on the mass of DM, as compared to the scenario where only DM annihilation is accounted for.","PeriodicalId":15445,"journal":{"name":"Journal of Cosmology and Astroparticle Physics","volume":"11 1","pages":""},"PeriodicalIF":6.4,"publicationDate":"2025-10-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145255721","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

Closing in on Pop-III stars: constraints and predictions across the spectrum 接近Pop-III恒星：跨光谱的约束和预测

IF 6.4 2区物理与天体物理

Journal of Cosmology and Astroparticle Physics Pub Date : 2025-10-09 DOI: 10.1088/1475-7516/2025/10/047

Omer Zvi Katz, Diego Redigolo and Tomer Volansky

{"title":"Closing in on Pop-III stars: constraints and predictions across the spectrum","authors":"Omer Zvi Katz, Diego Redigolo and Tomer Volansky","doi":"10.1088/1475-7516/2025/10/047","DOIUrl":"https://doi.org/10.1088/1475-7516/2025/10/047","url":null,"abstract":"The absence of direct high redshift observations poses a significant challenge in understanding the properties of first stars. Nonetheless, the cumulative effect of entire stellar populations can be studied with current data. In this work we use a combination of high redshift observables in order to infer the formation and emission properties of the first stellar populations: high redshift UVLFs, the optical depth of CMB photons to reionization, hydrogen absorption lines in quasar spectra, and measurements of the soft cosmic X-ray background. We study two minimal models of stellar population: i) a single, Pop-II, stellar population which dominates throughout Cosmic Dawn, ii) two distinct stellar populations, Pop-II and Pop-III, dominating at different times with the transition between them taken as a free parameter. We set strong constraints on the properties of Pop-II stars, and upper limits on the formation and multi-wavelength emission of Pop-III stars. After applying the constraints above, we present the viable envelopes of the 21-cm global signal with and without Pop-III stars. We identify a region in the parameter space of the two population model which predicts a global 21-cm signal distinctive from that of the single population one. A measurement of such a signal would be a strong indication for the presence of Pop-III stars at early times.","PeriodicalId":15445,"journal":{"name":"Journal of Cosmology and Astroparticle Physics","volume":"32 1","pages":""},"PeriodicalIF":6.4,"publicationDate":"2025-10-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145255723","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

Macroscopic magnetization of primordial plasma by virial shocks 原始等离子体在病毒冲击下的宏观磁化

IF 6.4 2区物理与天体物理

Journal of Cosmology and Astroparticle Physics Pub Date : 2025-10-08 DOI: 10.1088/1475-7516/2025/10/042

Uri Keshet and Kuan-Chou Hou

引用次数: 0