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Primordial full bispectra from the general bounce cosmology 来自一般弹跳宇宙学的原始全双光谱
IF 6.4 2区 物理与天体物理
Journal of Cosmology and Astroparticle Physics Pub Date : 2025-06-26 DOI: 10.1088/1475-7516/2025/06/063
Shingo Akama
{"title":"Primordial full bispectra from the general bounce cosmology","authors":"Shingo Akama","doi":"10.1088/1475-7516/2025/06/063","DOIUrl":"https://doi.org/10.1088/1475-7516/2025/06/063","url":null,"abstract":"Primordial non-Gaussianities are key quantities to test early universe scenarios. In this paper, we compute full bispectra of scalar and tensor perturbations generated during a contracting phase in a general bounce model. The general bounce model consists of two branches: one realizes scale-invariant scalar and tensor power spectra from perturbations whose amplitudes become constant on superhorizon scales, as in de Sitter inflation, while the other realizes scale-invariant power spectra from perturbations whose amplitudes grow on superhorizon scales, as in matter bounce cosmology. We study the auto- and cross-bispectra originating from the scale-invariant scalar and tensor perturbations in these two branches. We investigate the amplitudes and shapes of non-Gaussianities and find that the differences between the two branches manifest for equilateral and squeezed momentum triangle configurations. In particular, one of the branches in which the superhorizon perturbations are conserved reproduces the so-called Maldacena's consistency relation. By examining perturbativity conditions and considering current observational constraints on primordial non-Gaussianities, we also find a viable parameter space in which both theoretical and observational constraints are satisfied simultaneously.","PeriodicalId":15445,"journal":{"name":"Journal of Cosmology and Astroparticle Physics","volume":"8 1","pages":""},"PeriodicalIF":6.4,"publicationDate":"2025-06-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144516010","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
Geodesics, accretion disk, gravitational lensing, time delay, and effects on neutrinos induced by a non-commutative black hole 测地线，吸积盘，引力透镜，时间延迟，以及对非交换黑洞诱导的中微子的影响
IF 6.4 2区 物理与天体物理
Journal of Cosmology and Astroparticle Physics Pub Date : 2025-06-26 DOI: 10.1088/1475-7516/2025/06/062
A.A. Araújo Filho, N. Heidari and Ali Övgün
{"title":"Geodesics, accretion disk, gravitational lensing, time delay, and effects on neutrinos induced by a non-commutative black hole","authors":"A.A. Araújo Filho, N. Heidari and Ali Övgün","doi":"10.1088/1475-7516/2025/06/062","DOIUrl":"https://doi.org/10.1088/1475-7516/2025/06/062","url":null,"abstract":"This paper explores gravitational phenomena associated with a non-commutative black hole. Geodesic equations are derived, and a thin accretion disk is analyzed to model the black hole shadow image, considering an optically thin, radiating, and infalling gas. Retrolensing effects are examined to trace photon emission configurations, while gravitational lensing is investigated through weak and strong deflection limits, with lensing equations and observables applied to Sagittarius A*. The study also includes calculations of time delay, energy deposition rate from neutrino annihilation, phase and probability of neutrino oscillation, and neutrino gravitational lensing.","PeriodicalId":15445,"journal":{"name":"Journal of Cosmology and Astroparticle Physics","volume":"75 1","pages":""},"PeriodicalIF":6.4,"publicationDate":"2025-06-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144516009","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
Bayesian Deep-stacking for high-energy neutrino searches 高能中微子搜索的贝叶斯深度叠加
IF 6.4 2区 物理与天体物理
Journal of Cosmology and Astroparticle Physics Pub Date : 2025-06-26 DOI: 10.1088/1475-7516/2025/06/064
I. Bartos, M. Ackermann and M. Kowalski
{"title":"Bayesian Deep-stacking for high-energy neutrino searches","authors":"I. Bartos, M. Ackermann and M. Kowalski","doi":"10.1088/1475-7516/2025/06/064","DOIUrl":"https://doi.org/10.1088/1475-7516/2025/06/064","url":null,"abstract":"Following the discovery of the brightest high-energy neutrino sources in the sky, the further detection of fainter sources is more challenging. A natural solution is to combine fainter source candidates, and instead of individual detections, aim to identify and learn about the properties of a larger population. Due to the discreteness of high-energy neutrinos, they can be detected from distant very faint sources as well, making a statistical search benefit from the combination of a large number of distant sources, a called deep-stacking. Here we show that a Bayesian framework is well-suited to carry out such statistical probes, both in terms of detection and property reconstruction. After presenting an introductory explanation to the relevant Bayesian methodology, we demonstrate its utility in parameter reconstruction in a simplified case, and in delivering superior sensitivity compared to a maximum likelihood search in a realistic simulation.","PeriodicalId":15445,"journal":{"name":"Journal of Cosmology and Astroparticle Physics","volume":"63 1","pages":""},"PeriodicalIF":6.4,"publicationDate":"2025-06-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144516148","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
Connecting relativistic MOND theories with mimetic gravity 将相对论的MOND理论与模拟引力联系起来
IF 6.4 2区 物理与天体物理
Journal of Cosmology and Astroparticle Physics Pub Date : 2025-06-26 DOI: 10.1088/1475-7516/2025/06/059
Guillem Domènech and Alexander Ganz
{"title":"Connecting relativistic MOND theories with mimetic gravity","authors":"Guillem Domènech and Alexander Ganz","doi":"10.1088/1475-7516/2025/06/059","DOIUrl":"https://doi.org/10.1088/1475-7516/2025/06/059","url":null,"abstract":"We find a connection between relativistic Modified Newtonian Dynamics (MOND) theories and (scalar) mimetic gravity. We first demonstrate that any relativistic MOND model featuring a unit-timelike vector field, such as TeVeS or Aether-scalar-tensor theory, can be embedded within a conformal/disformal-invariant framework. Gauge fixing the conformal/disformal symmetry amounts to imposing a constraint on the norm of the vector, the scalar field or the cross contraction. Notably, we find that these constraints can be interchanged as long as the vector and scalar fields remain timelike. This means that relativistic MOND theories may be recasted as a mimetic gravity theory. Lastly, by constructing the fundamental building blocks of a conformal-invariant scalar-vector-tensor theory, we establish a new framework for developing relativistic MOND theories. This perspective offers deeper insight into how non-invertible disformal transformations and conformal/disformal symmetries serve as fundamental principles in constructing viable alternatives to dark matter.","PeriodicalId":15445,"journal":{"name":"Journal of Cosmology and Astroparticle Physics","volume":"26 1","pages":""},"PeriodicalIF":6.4,"publicationDate":"2025-06-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144515986","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
Freezing-in the pure dark axion portal 冻结在纯黑暗轴子入口
IF 6.4 2区 物理与天体物理
Journal of Cosmology and Astroparticle Physics Pub Date : 2025-06-26 DOI: 10.1088/1475-7516/2025/06/060
Paola Arias, Bastián Díaz Sáez and Joerg Jaeckel
{"title":"Freezing-in the pure dark axion portal","authors":"Paola Arias, Bastián Díaz Sáez and Joerg Jaeckel","doi":"10.1088/1475-7516/2025/06/060","DOIUrl":"https://doi.org/10.1088/1475-7516/2025/06/060","url":null,"abstract":"A Z2 symmetry under which “dark” and “visible” fields transform differently can further seclude already dark particles. In a dark sector consisting of an axion-like particle and a dark photon the dominant interaction can then be via a dark photon-axion portal to the ordinary photon. If the axion is lighter than the dark photon it naturally emerges as a viable dark matter candidate. We explore its freeze-in production both in a standard high-reheating temperature and weak coupling as well as a low-reheating temperature and strong coupling regime. Cosmological constraints are taken into account to identify viable regions in parameter space. For the strong freeze-in regime, we highlight the possibility of probing it at B-factories, beam dump and collider experiments. We also briefly discuss a potential misalignment contribution to the dark matter density and delineate under which conditions it can be neglected.","PeriodicalId":15445,"journal":{"name":"Journal of Cosmology and Astroparticle Physics","volume":"9 35 1","pages":""},"PeriodicalIF":6.4,"publicationDate":"2025-06-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144515987","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
Constraint on neutrino statistics from cosmological data 宇宙学数据对中微子统计量的约束
IF 6.4 2区 物理与天体物理
Journal of Cosmology and Astroparticle Physics Pub Date : 2025-06-26 DOI: 10.1088/1475-7516/2025/06/056
YiCheng Dai and Wei Liao
{"title":"Constraint on neutrino statistics from cosmological data","authors":"YiCheng Dai and Wei Liao","doi":"10.1088/1475-7516/2025/06/056","DOIUrl":"https://doi.org/10.1088/1475-7516/2025/06/056","url":null,"abstract":"We investigate the impact of neutrino statistical property on cosmology and the constraints imposed by cosmological data on neutrino statistics. Cosmological data from probes such as Cosmic Microwave Background(CMB) radiation and Baryon Acoustic Oscillation(BAO) are used to constrain the statistical parameter of neutrino. This constraint is closely related to the degeneracy effects among neutrino statistical property, the sum of neutrino masses, and the Hubble constant. Our results show that purely bosonic neutrinos can be ruled out at 95% confidence level.","PeriodicalId":15445,"journal":{"name":"Journal of Cosmology and Astroparticle Physics","volume":"20 1","pages":""},"PeriodicalIF":6.4,"publicationDate":"2025-06-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144515984","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
Origin of cosmological neutrino mass bounds: background versus perturbations 宇宙中微子质量界的起源：背景与扰动
IF 6.4 2区 物理与天体物理
Journal of Cosmology and Astroparticle Physics Pub Date : 2025-06-26 DOI: 10.1088/1475-7516/2025/06/058
Toni Bertólez-Martínez, Ivan Esteban, Rasmi Hajjar, Olga Mena and Jordi Salvado
{"title":"Origin of cosmological neutrino mass bounds: background versus perturbations","authors":"Toni Bertólez-Martínez, Ivan Esteban, Rasmi Hajjar, Olga Mena and Jordi Salvado","doi":"10.1088/1475-7516/2025/06/058","DOIUrl":"https://doi.org/10.1088/1475-7516/2025/06/058","url":null,"abstract":"The cosmological upper bound on the total neutrino mass is the dominant limit on this fundamental parameter. Recent observations — soon to be improved — have strongly tightened it, approaching the lower limit set by oscillation data. Understanding its physical origin, robustness, and model-independence becomes pressing. Here, we explicitly separate for the first time the two distinct cosmological neutrino-mass effects: the impact on background evolution, related to the energy in neutrino masses; and the “kinematic” impact on perturbations, related to neutrino free-streaming. We scrutinize how they affect CMB anisotropies, introducing two effective masses enclosing background (∑ mνBackg.) and perturbations (∑ mνPert.) effects. We analyze CMB data, finding that the neutrino-mass bound is mostly a background measurement, i.e., how the neutrino energy density evolves with time. The bound on the “kinematic” variable ∑ mνPert.. is largely relaxed, ∑ mνPert. < 0.8 eV. This work thus adds clarity to the physical origin of the cosmological neutrino-mass bound, which is mostly a measurement of the neutrino equation of state, providing also hints to evade such a bound.","PeriodicalId":15445,"journal":{"name":"Journal of Cosmology and Astroparticle Physics","volume":"25 1","pages":""},"PeriodicalIF":6.4,"publicationDate":"2025-06-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144516146","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
Is leptogenesis during gravitational reheating flavourful? 重力再加热过程中的纤毛发生有味道吗？
IF 6.4 2区 物理与天体物理
Journal of Cosmology and Astroparticle Physics Pub Date : 2025-06-26 DOI: 10.1088/1475-7516/2025/06/061
Basabendu Barman, Arghyajit Datta and Md Riajul Haque
{"title":"Is leptogenesis during gravitational reheating flavourful?","authors":"Basabendu Barman, Arghyajit Datta and Md Riajul Haque","doi":"10.1088/1475-7516/2025/06/061","DOIUrl":"https://doi.org/10.1088/1475-7516/2025/06/061","url":null,"abstract":"We examine the impact of charged lepton Yukawa equilibration on leptogenesis during gravitational reheating. During the post-inflationary era, the inflaton field is assumed to oscillate around the minimum of a monomial potential, leading to the gravitational production of Standard Model (SM) particles, constituting the radiation bath. The heavy right-handed neutrinos (RHN), responsible for generating baryon asymmetry via leptogenesis, are also produced through graviton-mediated scattering of the homogeneous inflaton field and thermal bath, as well as from the inverse decay of the bath particles. By considering both minimal and non-minimal gravitational contributions to SM, we demonstrate that flavour effects can be safely neglected in the minimal reheating scenario. However, with large non-minimal coupling, these effects may become important, depending on the choice of the RHN mass. We identify the corresponding viable parameter space that satisfies the observed baryon asymmetry in each case.","PeriodicalId":15445,"journal":{"name":"Journal of Cosmology and Astroparticle Physics","volume":"272 1","pages":""},"PeriodicalIF":6.4,"publicationDate":"2025-06-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144515988","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
Long-lived quasinormal modes around regular black holes and wormholes in Covariant Effective Quantum Gravity 协变有效量子引力中规则黑洞和虫洞周围的长寿命准正态模
IF 6.4 2区 物理与天体物理
Journal of Cosmology and Astroparticle Physics Pub Date : 2025-06-26 DOI: 10.1088/1475-7516/2025/06/057
B.C. Lütfüoğlu
{"title":"Long-lived quasinormal modes around regular black holes and wormholes in Covariant Effective Quantum Gravity","authors":"B.C. Lütfüoğlu","doi":"10.1088/1475-7516/2025/06/057","DOIUrl":"https://doi.org/10.1088/1475-7516/2025/06/057","url":null,"abstract":"We study quasinormal modes of massive scalar and massless Dirac fields in the background of regular black holes and traversable wormholes arising in Covariant Effective Quantum Gravity. Using both the Jeffreys-Wentzel-Kramers-Brillouin approximation and time-domain integration, we analyze the impact of quantum corrections on the quasinormal spectra and late-time behavior of perturbations. Our results reveal the existence of slowly decaying, oscillatory tails and quasi-resonant modes in the scalar sector, particularly in the high-mass regime. In the fermionic case, the damping rate increases with the quantum correction parameter ξ, while the oscillation frequency decreases. We also observe pronounced echo-like structures in the time-domain profiles near the black hole-wormhole threshold. These findings provide insight into the dynamics of perturbations in quantum-corrected spacetimes and offer potential signatures for distinguishing black holes from wormholes in future gravitational wave observations.","PeriodicalId":15445,"journal":{"name":"Journal of Cosmology and Astroparticle Physics","volume":"63 1","pages":""},"PeriodicalIF":6.4,"publicationDate":"2025-06-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144515985","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
A revisited correction to the halo mass function for local-type primordial non-Gaussianity 对局域型原初非高斯性的光晕质量函数的重新修正
IF 6.4 2区 物理与天体物理
Journal of Cosmology and Astroparticle Physics Pub Date : 2025-06-24 DOI: 10.1088/1475-7516/2025/06/053
L. Fiorino, S. Contarini, F. Marulli, A.G. Sánchez, M. Baldi, A. Fiorilli and L. Moscardini
{"title":"A revisited correction to the halo mass function for local-type primordial non-Gaussianity","authors":"L. Fiorino, S. Contarini, F. Marulli, A.G. Sánchez, M. Baldi, A. Fiorilli and L. Moscardini","doi":"10.1088/1475-7516/2025/06/053","DOIUrl":"https://doi.org/10.1088/1475-7516/2025/06/053","url":null,"abstract":"We investigate the effect of primordial non-Gaussianities on halo number counts using N-body simulations with different values of fNLloc. We show how current theoretical models fail to adequately describe the non-Gaussian mass function of halos identified with different overdensity thresholds, Δb. We explain how these discrepancies are related to a variation in the density profile of dark matter halos, finding that the internal steepness (i.e. the compactness) of halos depends on the value of fNLloc. We then parametrize these deviations in halo number counts with a factor κ(Δb) that modifies the linear density threshold for collapse according to the halo identification threshold used, defined with respect to the Universe background density. We rely on a second-degree polynomial to describe κ and employ a Bayesian analysis to determine the coefficients of this polynomial. In addition, we verify the independence of the latter on the sign and absolute value of fNLloc. Finally, we show how this re-parametrization prevents the extraction of biased constraints on fNLloc, correcting for large systematic errors especially in the case of halos identified with high density thresholds. This improvement is crucial in the perspective of deriving cosmological constraints with the non-Gaussian mass function from real data, as different mass definitions can be employed depending on the properties of the survey.","PeriodicalId":15445,"journal":{"name":"Journal of Cosmology and Astroparticle Physics","volume":"16 1","pages":""},"PeriodicalIF":6.4,"publicationDate":"2025-06-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144479145","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
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