Journal of Cosmology and Astroparticle Physics最新文献_第7页

Widen the resonance at ultra-high energies: novel probes of neutrino self-interactions in the high-mass regime 在超高能量下扩大共振：在高质量状态下中微子自相互作用的新探针

IF 6.4 2区物理与天体物理

Journal of Cosmology and Astroparticle Physics Pub Date : 2026-07-16 DOI: 10.1088/1475-7516/2026/07/064

Pedro A.N. Machado, Isaac R. Wang, Xun-Jie Xu and Bei Zhou

{"title":"Widen the resonance at ultra-high energies: novel probes of neutrino self-interactions in the high-mass regime","authors":"Pedro A.N. Machado, Isaac R. Wang, Xun-Jie Xu and Bei Zhou","doi":"10.1088/1475-7516/2026/07/064","DOIUrl":"https://doi.org/10.1088/1475-7516/2026/07/064","url":null,"abstract":"Neutrino self-interactions beyond the Standard Model are well motivated by the nonzero masses of neutrinos, which are the only known particles guaranteed to have new physics. Meanwhile, cosmic messengers, especially neutrinos, play a central role in probing new physics, as they provide experimental conditions far beyond the reach of laboratories and serve as the link between laboratory fundamental-physics discoveries and their roles in the Universe, where many new physics motivations originate. In this work, we propose a novel probe of neutrino self-interactions through ultrahigh-energy neutrinos scattering off the cosmic neutrino background when the lightest neutrino species remains relativistic today. This allows us to “Widen the Resonance” of such scattering [1]. In addition, we also provide a semi-analytic framework for cosmogenic ultrahigh-energy neutrino production, avoiding computationally intensive simulations and yielding results precise enough for beyond-the-standard-model studies. The widened resonance enables future ultrahigh-energy neutrino telescopes, in particular GRAND, to probe mediator masses from MeV to GeV, reaching couplings down to g ∼ 10-3 — up to two orders of magnitude beyond current bounds. Our results enhance the discovery potential of neutrino self-interactions in the high-mass regime, potentially offering crucial insights into the connections between the neutrino sector and dark sector.","PeriodicalId":15445,"journal":{"name":"Journal of Cosmology and Astroparticle Physics","volume":"344 1","pages":""},"PeriodicalIF":6.4,"publicationDate":"2026-07-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148460534","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 U(1) X Breaking and Right-Handed Neutrino Dynamics U(1) X破缺的引力波特征与右手中微子动力学

IF 6.4 2区物理与天体物理

Journal of Cosmology and Astroparticle Physics Pub Date : 2026-07-15 DOI: 10.1088/1475-7516/2026/07/061

Arnab Chaudhuri, Priya Mishra and Rukmani Mohanta

{"title":"Gravitational Wave Signatures of U(1) X Breaking and Right-Handed Neutrino Dynamics","authors":"Arnab Chaudhuri, Priya Mishra and Rukmani Mohanta","doi":"10.1088/1475-7516/2026/07/061","DOIUrl":"https://doi.org/10.1088/1475-7516/2026/07/061","url":null,"abstract":"The Standard Model (SM) leaves several fundamental questions unanswered, including the origin of neutrino masses, the baryon asymmetry of the Universe, and the nature of dark matter. Motivated by these gaps, we investigate an extension of the SM with an additional local U(1)X gauge symmetry and a complex scalar singlet that spontaneously breaks this symmetry via its vacuum expectation value. The extended framework naturally accommodates three right-handed neutrinos (RHNs) to ensure anomaly cancellation and implements a type-I seesaw mechanism for active neutrino masses. We utilized Casas-Ibarra parameterization to systematically reconstruct the Yukawa coupling matrix which automatically satisfy the observed neutrino data. Furthermore, we estimate the key parameters of the first-order phase transition and compute the resulting stochastic gravitational wave spectrum, demonstrating that it can lie within the reach of forthcoming experiments such as LISA, DECIGO, BBO, and the Einstein Telescope. The right-handed neutrinos also open a viable path for thermal leptogenesis, providing a unified link between neutrino mass generation, baryogenesis, and gravitational wave signatures. Our results demonstrate that this minimal U(1)X scenario remains a promising probe for physics beyond the Standard Model, accessible through upcoming gravitational wave and neutrino experiments.","PeriodicalId":15445,"journal":{"name":"Journal of Cosmology and Astroparticle Physics","volume":"98 1","pages":""},"PeriodicalIF":6.4,"publicationDate":"2026-07-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148460537","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

Examining the influence of anisotropy on the fundamental mode of nonradial oscillation in neutron stars on a complete general relativistic scheme 在完全广义相对论格式下检验各向异性对中子星非径向振荡基本模态的影响

IF 6.4 2区物理与天体物理

Journal of Cosmology and Astroparticle Physics Pub Date : 2026-07-15 DOI: 10.1088/1475-7516/2026/07/059

José D.V. Arbañil, Gabriel O. Cavalheiro, Victor B.T. Alves, Juan M.Z. Pretel, César O.V. Flores and César H. Lenzi

引用次数: 0

Cosmological gravity on all scales. Part V. MCMC forecasts combining large scale structure and CMB lensing for binned phenomenological modified gravity 所有尺度上的宇宙引力。第五部分：结合大尺度结构和CMB透镜的MCMC预测

IF 6.4 2区物理与天体物理

Journal of Cosmology and Astroparticle Physics Pub Date : 2026-07-15 DOI: 10.1088/1475-7516/2026/07/058

Sankarshana Srinivasan, Shreya Prabhu, Kai Lehman, Ajiv Krishnan V. and Jochen Weller

{"title":"Cosmological gravity on all scales. Part V. MCMC forecasts combining large scale structure and CMB lensing for binned phenomenological modified gravity","authors":"Sankarshana Srinivasan, Shreya Prabhu, Kai Lehman, Ajiv Krishnan V. and Jochen Weller","doi":"10.1088/1475-7516/2026/07/058","DOIUrl":"https://doi.org/10.1088/1475-7516/2026/07/058","url":null,"abstract":"As cosmology rapidly approaches the data-dominated phase of stage IV large scale structure surveys, the modelling of nonlinear scales has become a serious challenge that faces the community, particularly when analysing models beyond wCDM. In this work, we emulate the matter power spectrum in a phenomenological parameterisation of modified gravity in which a time-varying effective gravitational constant μ and a gravitational slip η are binned in redshift. We are able to achieve accuracy < 1% in the modified gravity boost relative to COLA (COmoving Lagrangian Acceleration) simulations, up to k = 1 h Mpc-1. The emulator is publicly available at https://github.com/sankarshana16/mg_binned_boost_emulator. We forecast the constraining power for each bin using a simulated 3 × 2pt LSST Y10-like data vector and a 6 × 2pt LSST Y10 x Simons Observatory cosmic microwave background (CMB) lensing data vector. We recover the characteristic degeneracy between μ and η previously identified in Fisher forecasts and demonstrate that the best-constrained direction corresponds to the combination Σ = μ(1 + η)/2 which governs the lensing potential. We show that while large scale structure is sensitive to growth of structure at low redshift, CMB lensing extends the sensitivity to a higher redshift range. These results demonstrate that fast emulation of nonlinear modified-gravity effects enables full Bayesian analyses of model-agnostic gravity parameterisations with realistic survey data vectors and astrophysical systematics.","PeriodicalId":15445,"journal":{"name":"Journal of Cosmology and Astroparticle Physics","volume":"22 1","pages":""},"PeriodicalIF":6.4,"publicationDate":"2026-07-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148460535","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

Warm Dark Matter meets Cold Dark Matter Isocurvature 暖暗物质与冷暗物质等曲率相遇

IF 6.4 2区物理与天体物理

Journal of Cosmology and Astroparticle Physics Pub Date : 2026-07-15 DOI: 10.1088/1475-7516/2026/07/057

Sai Chaitanya Tadepalli and Tomo Takahashi

{"title":"Warm Dark Matter meets Cold Dark Matter Isocurvature","authors":"Sai Chaitanya Tadepalli and Tomo Takahashi","doi":"10.1088/1475-7516/2026/07/057","DOIUrl":"https://doi.org/10.1088/1475-7516/2026/07/057","url":null,"abstract":"Isocurvature fluctuations can be generated in various scenarios in the early Universe. In particular, some specific models predict those with a blue-tilted spectrum, which is consistent with the constraints from cosmic microwave background. We argue that cold dark matter (CDM) isocurvature fluctuations with blue-tilted spectrum are not only consistent with current cosmological data, but also can loosen the bound on the masses of warm dark matter (WDM). While previous studies using small-scale probes such as Lyman-α forest, gravitational lensing, and Milky Way satellites have placed strong lower bounds on the thermal WDM mass in standard adiabatic scenarios, in this work we show that the addition of a blue-tilted CDM isocurvature component, consistent with CMB and BAO data, can in-principle partially compensate the suppression of small-scale power in WDM models, even for very small CDM fractions. We explore the implications of this “warm + cold-isocurvature” scenario for structure formation by performing N-body simulations, focusing on the nonlinear matter power spectrum and halo mass function. This work is a first step, testing the predictions from the mechanism at the level of power spectra and simulations. Our results demonstrate that such models with sub-keV WDM masses and CDM isocurvature can reproduce small-scale power spectra similar to those of colder or mixed dark matter scenarios. A full assessment of their consistency with small-scale observations is left for future work.","PeriodicalId":15445,"journal":{"name":"Journal of Cosmology and Astroparticle Physics","volume":"31 1","pages":""},"PeriodicalIF":6.4,"publicationDate":"2026-07-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148460533","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

Axions at the meV crossroads: theory, cosmology, astrophysics, and experiments meV十字路口的轴子：理论、宇宙学、天体物理学和实验

IF 6.4 2区物理与天体物理

Journal of Cosmology and Astroparticle Physics Pub Date : 2026-07-15 DOI: 10.1088/1475-7516/2026/07/060

Michele Cicoli, Francesco D'Eramo, Luca Di Luzio, Damiano F.G. Fiorillo, Maurizio Giannotti, Alicia Gomez, Diego Guadagnoli, Mathieu Kaltschmidt, Bradley J. Kavanagh, Alessandro Lella, Giuseppe Lucente, David J.E. Marsh, Federico Mescia, Alessandro Mirizzi, Javier Redondo, Nicole Righi, Jaime Ruz, Ken'ichi Saikawa, Elisa Todarello, Edoardo Vitagliano and Su-Yang Xu

{"title":"Axions at the meV crossroads: theory, cosmology, astrophysics, and experiments","authors":"Michele Cicoli, Francesco D'Eramo, Luca Di Luzio, Damiano F.G. Fiorillo, Maurizio Giannotti, Alicia Gomez, Diego Guadagnoli, Mathieu Kaltschmidt, Bradley J. Kavanagh, Alessandro Lella, Giuseppe Lucente, David J.E. Marsh, Federico Mescia, Alessandro Mirizzi, Javier Redondo, Nicole Righi, Jaime Ruz, Ken'ichi Saikawa, Elisa Todarello, Edoardo Vitagliano and Su-Yang Xu","doi":"10.1088/1475-7516/2026/07/060","DOIUrl":"https://doi.org/10.1088/1475-7516/2026/07/060","url":null,"abstract":"The meV mass range has emerged as a focal point in axion physics, where advances in theory, cosmology, astrophysics, and experimental techniques converge. Axions in this mass range are theoretically well motivated, can arise in ultraviolet-complete models, and can have significant cosmological impacts as dark matter or dark radiation. In parallel, their efficient production in stellar and supernova environments provides powerful astrophysical probes. Here, we provide a comprehensive overview of meV axions across these domains, highlighting both established results and open questions. We discuss the theoretical underpinnings of meV axions, their cosmological and astrophysical signatures, and the diverse experimental strategies — ranging from helioscopes and haloscopes to quasiparticle systems and large-volume Cherenkov detectors — that aim to explore this regime. The convergence of these approaches emphasizes the pivotal role of the meV mass range for axion discovery in the coming years, identifying meV axions as a key probe for testing beyond-Standard-Model physics. This review document is the direct outcome of the discussions at the dedicated workshop “The meV Mass Axion Frontier: Challenges and Opportunities”, held at Laboratori Nazionali di Frascati (IT) on 27–28 October 2025, and organized by the EU funded COST Action “Cosmic WISPers in the Dark Universe: Theory, astrophysics, and experiments” (CA21106, https://www.cost.eu/actions/CA21106). Its aim is to provide an overview of current efforts in meV axion research, their motivations, and the research goals that animate the community involved in this search.","PeriodicalId":15445,"journal":{"name":"Journal of Cosmology and Astroparticle Physics","volume":"250 1","pages":""},"PeriodicalIF":6.4,"publicationDate":"2026-07-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148460536","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

Production of gravitational waves from preheating and tachyonic instabilities 由预热和速速不稳定性产生的引力波

IF 6.4 2区物理与天体物理

Journal of Cosmology and Astroparticle Physics Pub Date : 2026-07-15 DOI: 10.1088/1475-7516/2026/07/056

Khursid Alam, Koushik Dutta and Ahamadullah Khan

引用次数: 0

The CMB Cold Spot under the lens II: lensing signatures in polarization and cosmic texture footprints 透镜下的CMB冷斑II：偏振和宇宙纹理足迹的透镜特征

IF 6.4 2区物理与天体物理

Journal of Cosmology and Astroparticle Physics Pub Date : 2026-07-14 DOI: 10.1088/1475-7516/2026/07/055

Pedro da Silveira Ferreira and Stephen Owusu

{"title":"The CMB Cold Spot under the lens II: lensing signatures in polarization and cosmic texture footprints","authors":"Pedro da Silveira Ferreira and Stephen Owusu","doi":"10.1088/1475-7516/2026/07/055","DOIUrl":"https://doi.org/10.1088/1475-7516/2026/07/055","url":null,"abstract":"We forecast the detectability of the lensing footprint of a collapsing cosmic texture, a topological defect proposed as an explanation of the CMB Cold Spot. Our pipeline is a quadratic, template-amplitude estimator for localized, azimuthally symmetric lensing profiles: it projects the standard off-diagonal covariance response of lensed CMB fields onto a physically motivated template. Rather than reconstructing an arbitrary lensing field, the method targets weak but coherent localized footprints from sources such as voids, clusters and topological defects. Using the temperature/polarization pairs TT, TE + ET, EE, TB + BT and EB + BE for forthcoming Simons Observatory data, we estimate a 2.3σ detection if the texture amplitude reaches the current Planck 2018 2σ upper limit, and a 1.5σ measurement for the best-fit texture parameters. This sensitivity is notable given the expected typical deflection angle below 6”. The inclusion of polarization substantially increases the cumulative signal-to-noise ratio, by ∼ 67% relative to temperature alone, making sub-10” localized lensing footprints accessible to SO-like surveys.","PeriodicalId":15445,"journal":{"name":"Journal of Cosmology and Astroparticle Physics","volume":"48 1","pages":""},"PeriodicalIF":6.4,"publicationDate":"2026-07-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148460539","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

Deviations from Gaussian white noise in stochastic inflation 随机膨胀中高斯白噪声的偏差

IF 6.4 2区物理与天体物理

Journal of Cosmology and Astroparticle Physics Pub Date : 2026-07-14 DOI: 10.1088/1475-7516/2026/07/054

Zahra Ahmadi and Mahdiyar Noorbala

{"title":"Deviations from Gaussian white noise in stochastic inflation","authors":"Zahra Ahmadi and Mahdiyar Noorbala","doi":"10.1088/1475-7516/2026/07/054","DOIUrl":"https://doi.org/10.1088/1475-7516/2026/07/054","url":null,"abstract":"Stochastic inflation is widely used as a framework to study scalar field perturbations on an inflationary spacetime in a classical manner. In Starobinsky's seminal work and most of the subsequent literature, stochastic inflation is driven by a white noise. This is a consequence of a number of assumptions about the background metric, the window function, and the initial state. Given that noise is the central object in this approach, it is worthwhile to investigate how the noise is modified upon relaxing some of these assumptions. We show that while deviation from an exact de Sitter background maintains the white character of the noise (only with a time-dependent amplitude), deviation from the Heaviside window function or the Bunch-Davies initial state can produce colored noise. We calculate the power spectrum and the memory of the noise for a toy model with a piecewise linear window function. We also show that, in order to produce a colored noise, the deviation from the Bunch-Davies vacuum should essentially be a sum of two-particle states. The resulting noise is non-stationary and we find its instantaneous power spectrum in a concrete example. Furthermore, while deviations from de Sitter background and sharp cutoff do not affect Gaussianity, changing the initial state yields a non-Gaussian noise.","PeriodicalId":15445,"journal":{"name":"Journal of Cosmology and Astroparticle Physics","volume":"10 1","pages":""},"PeriodicalIF":6.4,"publicationDate":"2026-07-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148441453","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

Emergence of complex web structures 复杂网络结构的出现

IF 6.4 2区物理与天体物理

Journal of Cosmology and Astroparticle Physics Pub Date : 2026-07-14 DOI: 10.1088/1475-7516/2026/07/051

Francisco-Shu Kitaura

{"title":"Emergence of complex web structures","authors":"Francisco-Shu Kitaura","doi":"10.1088/1475-7516/2026/07/051","DOIUrl":"https://doi.org/10.1088/1475-7516/2026/07/051","url":null,"abstract":"Complex structures often emerge from initially homogeneous or weakly correlated states. We address the apparent tension between this ordering and entropy growth through a unified framework combining semi-microscopic phase-space dynamics, transport geometry, information theory, and coarse-grained effective modeling. The key point is that entropy depends on the level of description: a coarse-grained spatial field may become more ordered as structure forms, even while the full phase-space description becomes more complex through shell crossing, multistreaming, and the activation of velocity degrees of freedom. Using a Lagrangian-Eulerian transport map, we show how density amplification is governed by the Jacobian of the deformation and how anisotropic collapse arises from the eigenvalues of a hierarchy of deformation tensors. Long-range interaction or information flow is encoded in the displacement field, so that nonlocality enters directly through transport. We connect this geometric description to a maximum-entropy Gaussian baseline and show how nonlinear transport and nonlocal coupling generate scale coupling, higher-order correlations, and non-Gaussianity. We then formulate a Landau-Ginzburg description in which the growth of seed anisotropies is interpreted as the activation of lower effective free-energy branches, providing a coarse-grained realization of self-organization. Applied to generated cosmological fields, this framework indicates that the nonlocal tidal level becomes relevant already at moderate overdensity. Although cosmological structure formation is the main realization considered here, the framework is intended more broadly as a mesoscopic language for systems in which transport, anisotropy, nonlocality, and self-organization are central.","PeriodicalId":15445,"journal":{"name":"Journal of Cosmology and Astroparticle Physics","volume":"17 1","pages":""},"PeriodicalIF":6.4,"publicationDate":"2026-07-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148441382","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