Journal of Cosmology and Astroparticle Physics最新文献

Decay rate of PQ-ball pq球的衰减率

IF 6.4 2区物理与天体物理

Journal of Cosmology and Astroparticle Physics Pub Date : 2025-07-17 DOI: 10.1088/1475-7516/2025/07/057

Jin Kobayashi, Kazunori Nakayama and Masaki Yamada

引用次数: 0

Heating the dark matter halo with dark radiation from supernovae 用超新星的暗辐射加热暗物质光晕

IF 6.4 2区物理与天体物理

Journal of Cosmology and Astroparticle Physics Pub Date : 2025-07-17 DOI: 10.1088/1475-7516/2025/07/058

Stefan Vogl and Xun-Jie Xu

{"title":"Heating the dark matter halo with dark radiation from supernovae","authors":"Stefan Vogl and Xun-Jie Xu","doi":"10.1088/1475-7516/2025/07/058","DOIUrl":"https://doi.org/10.1088/1475-7516/2025/07/058","url":null,"abstract":"Supernova explosions are among the most extreme events in the Universe, making them a promising environment in which to search for the effects of light, weakly coupled new particles. As significant sources of energy, they are known to have an important effect on the dynamics of ordinary matter in their host galaxies but their potential impact on the dark matter (DM) halo remains less explored. In this work, we investigate the possibility that some fraction of the supernova energy is released via the form of dark radiation into the DM halo. Based on evaluation of energetics, we find that even a small fraction of the total SN energy is sufficient to change the overall shape of the DM halo and transform a cuspy halo into a cored one. This may help to explain the cores that are observed in some dwarf galaxies. Alternatively, one can interpret the upper limit on the size of a possible DM core as an upper limit on the energy that can go into light particles beyond the SM. These arguments are largely independent of a concrete model for the new physics. Nevertheless, it is important to ensure that the conditions we need, i.e. significant supernova emissivity of dark radiation and the opacity of DM halo to the dark radiation, can be met in actual models. To demonstrate this, we study four simple benchmark models: the dark photon, dark Higgs, and gauged B-L and Lμ - Lτ models — all provide light weakly coupled particles serving as the dark radiation. Assuming a sizable coupling of the dark radiation to DM, we find that all of the benchmark models have a significant part of the parameter space that meets the conditions. Interestingly, the couplings allowed by observations of SN1987A can have a significant effect on the halo of dwarf spheroidal galaxies.","PeriodicalId":15445,"journal":{"name":"Journal of Cosmology and Astroparticle Physics","volume":"46 1","pages":""},"PeriodicalIF":6.4,"publicationDate":"2025-07-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144652323","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

Evolving dark energy or dark matter with an evolving equation-of-state? 不断演化的暗能量或状态方程不断演化的暗物质？

IF 6.4 2区物理与天体物理

Journal of Cosmology and Astroparticle Physics Pub Date : 2025-07-17 DOI: 10.1088/1475-7516/2025/07/059

Xingang Chen and Abraham Loeb

引用次数: 0

Stability of domain walls with inflationary fluctuations under potential bias, and gravitational wave signatures 位势偏置下膨胀波动域壁的稳定性和引力波特征

IF 6.4 2区物理与天体物理

Journal of Cosmology and Astroparticle Physics Pub Date : 2025-07-16 DOI: 10.1088/1475-7516/2025/07/053

Naoya Kitajima, Junseok Lee, Fuminobu Takahashi and Wen Yin

引用次数: 0

The re-markable 21-cm power spectrum. Part I. Probing the Hi distribution in the post-reionization era using marked statistics 非凡的21厘米功率谱。第一部分：用标记统计方法探讨后再电离时代的Hi分布

IF 6.4 2区物理与天体物理

Journal of Cosmology and Astroparticle Physics Pub Date : 2025-07-16 DOI: 10.1088/1475-7516/2025/07/054

Mohd Kamran, Martin Sahlén, Debanjan Sarkar and Suman Majumdar

{"title":"The re-markable 21-cm power spectrum. Part I. Probing the Hi distribution in the post-reionization era using marked statistics","authors":"Mohd Kamran, Martin Sahlén, Debanjan Sarkar and Suman Majumdar","doi":"10.1088/1475-7516/2025/07/054","DOIUrl":"https://doi.org/10.1088/1475-7516/2025/07/054","url":null,"abstract":"The neutral hydrogen (Hi) power spectrum, measured from intensity fluctuations in the 21-cm background, offers insights into the large-scale structures (LSS) of our Universe in the post-reionization era (redshift z < 6). A significant amount of Hi is expected to reside in low- and intermediate-density environments, but the power spectrum mainly captures information from high-density regions. To more fully extract the information contained in the Hi field, we investigate the use of a marked power spectrum statistic. Here, the power spectrum is effectively re-weighted using a non-linear mark function which depends on the smoothed local density, such that low- or high-density regions are up- or down-weighted. This approach may also capture information on some higher-order statistical moments of the field. We model the Hi distribution using semi-numerical simulations and for the first time study the marked Hi power spectrum, across 1 ≤ z ≤ 5. Our analysis indicates that there is considerable evolution of the Hi field during the post-reionization era. Over a wide range of length scales (comoving wave numbers 0.05 ≤ k ≤ 1.0 Mpc-1) we expectedly find that the Hi evolves slowly at early times, but more rapidly at late times. This evolution is not well-captured by the power spectrum of the standard (unmarked) Hi field. We also study how the evolution of the Hi field depends on the chosen smoothing scale for the mark, and how this affects the marked power spectrum. We conclude that the information about the Hi content at low and intermediate densities is important for a correct and consistent analysis of Hi content and evolution based on the 21-cm background.","PeriodicalId":15445,"journal":{"name":"Journal of Cosmology and Astroparticle Physics","volume":"30 1","pages":""},"PeriodicalIF":6.4,"publicationDate":"2025-07-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144645464","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

Breaking parity: the case of the trispectrum from chiral scalar-tensor theories of gravity 破宇称：引力的手性标量张量理论的三谱

IF 6.4 2区物理与天体物理

Journal of Cosmology and Astroparticle Physics Pub Date : 2025-07-16 DOI: 10.1088/1475-7516/2025/07/051

Tommaso Moretti, Nicola Bartolo and Alessandro Greco

{"title":"Breaking parity: the case of the trispectrum from chiral scalar-tensor theories of gravity","authors":"Tommaso Moretti, Nicola Bartolo and Alessandro Greco","doi":"10.1088/1475-7516/2025/07/051","DOIUrl":"https://doi.org/10.1088/1475-7516/2025/07/051","url":null,"abstract":"Recently, possible hints of parity violation have been observed in the connected galaxy four-point correlation function. Although the true origin of the signal from the analysis has been debated, should they have a physical origin, they might point to primordial non-Gaussianity and would be evidence of new physics. In this work, we examine the single-field slow-roll model of inflation within chiral scalar-tensor theories of modified gravity. These theories, treated here as new Lorentz-breaking theories, extend the Chern-Simons one by including parity-violating operators containing first and second derivatives of the non-minimally coupled scalar (inflaton) field. This model is capable of imprinting parity-violating signatures in late-time observables, such as the galaxy four-point correlation function. We perform an analysis of the graviton-mediated scalar trispectrum of the gauge-invariant curvature perturbation ζ(t,x) using one of the parity-violating operators of these theories as a case study. We estimate that for a set of parameters of the theory it is possible to produce a signal-to-noise ratio for the parity-violating part of the trispectrum of order one without introducing modifications to the single-field slow-roll setup. Even if the signal found in the analysis turns out to be spurious or if no parity violation is ever detected in the galaxy four-point correlation function, our analysis can be used to constrain the free parameters of these theories.","PeriodicalId":15445,"journal":{"name":"Journal of Cosmology and Astroparticle Physics","volume":"109 1","pages":""},"PeriodicalIF":6.4,"publicationDate":"2025-07-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144645461","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

Primordial black holes from a curvaton: the role of bimodal distributions 来自曲率的原始黑洞：双峰分布的作用

IF 6.4 2区物理与天体物理

Journal of Cosmology and Astroparticle Physics Pub Date : 2025-07-16 DOI: 10.1088/1475-7516/2025/07/052

Tomotaka Kuroda, Atsushi Naruko, Vincent Vennin and Masahide Yamaguchi

引用次数: 0

Do JWST reionization (optical depth) puzzle, cosmological tensions, and CMB anomalies imply Harrison-Zel'dovich spectrum? JWST再电离（光学深度）难题、宇宙张力和CMB异常是否意味着哈里森-泽尔多维奇光谱？

IF 6.4 2区物理与天体物理

Journal of Cosmology and Astroparticle Physics Pub Date : 2025-07-16 DOI: 10.1088/1475-7516/2025/07/056

Hao-Hao Li, Xin-zhe Zhang, Taotao Qiu and Jun-Qing Xia

{"title":"Do JWST reionization (optical depth) puzzle, cosmological tensions, and CMB anomalies imply Harrison-Zel'dovich spectrum?","authors":"Hao-Hao Li, Xin-zhe Zhang, Taotao Qiu and Jun-Qing Xia","doi":"10.1088/1475-7516/2025/07/056","DOIUrl":"https://doi.org/10.1088/1475-7516/2025/07/056","url":null,"abstract":"The James Webb Space Telescope (JWST) has observed massive galaxies at high redshifts, which implies an earlier epoch of reionization (EoR) compared with the cosmic microwave background (CMB) results. In this paper, based on Planck 2020 (NPIPE release), ACT DR4 and SPT-3G data, if assumed a Harrison-Zel'dovich (HZ) primordial power spectrum in the standard cosmological model, we show that the redshift or optical depth of reionization is larger than the case of a power-law (PL) primordial power spectrum. In HZ-ΛCDM model, the redshift of reionization is zreio = 9.11 ± 0.61, which is consistent with the JWST result that zreio ≈ 8.9. Moreover, the cosmological tensions, i.e. Hubble (H0) tension and S8 tension are alleviated in HZ-ΛCDM case. The Hubble constant is H0 = 70.38 ± 0.35 km/s/Mpc and the structure growth parameter is S8 = 0.7645 ± 0.0094 in HZ-ΛCDM model. We also consider two extensions of ΛCDM, including ΛCDM+AL and ΛCDM+Ωk models. But the extensions of ΛCDM with a HZ spectrum meet more serious CMB anomalies, i.e. lensing anomaly and spatial curvature anomaly as compared with the extensions of ΛCDM with a PL spectrum. We discuss that these two CMB anomalies may come from the degeneracy of cosmological parameters.","PeriodicalId":15445,"journal":{"name":"Journal of Cosmology and Astroparticle Physics","volume":"95 1","pages":""},"PeriodicalIF":6.4,"publicationDate":"2025-07-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144645466","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

Decoupling local primordial non-Gaussianity from relativistic effects in the galaxy bispectrum 星系双谱中的相对论效应解耦局部原初非高斯性

IF 6.4 2区物理与天体物理

Journal of Cosmology and Astroparticle Physics Pub Date : 2025-07-16 DOI: 10.1088/1475-7516/2025/07/055

Samantha J. Rossiter, Stefano Camera, Chris Clarkson and Roy Maartens

{"title":"Decoupling local primordial non-Gaussianity from relativistic effects in the galaxy bispectrum","authors":"Samantha J. Rossiter, Stefano Camera, Chris Clarkson and Roy Maartens","doi":"10.1088/1475-7516/2025/07/055","DOIUrl":"https://doi.org/10.1088/1475-7516/2025/07/055","url":null,"abstract":"Upcoming galaxy surveys aim to map the Universe with unprecedented precision, depth and sky coverage. The galaxy bispectrum is a prime source of information as it allows us to probe primordial non-Gaussianity (PNG), a key factor in differentiating various models of inflation. On the scales where local PNG is strongest, Doppler and other relativistic effects become important and need to be included. Unlike for the single-tracer power spectrum, the leading order imaginary Doppler term does not cancel out in the bispectrum, leaving a smoking gun imaginary dipole signal. We investigate the detectability and importance of relativistic and local PNG contributions in the galaxy bispectrum. We compute the signal-to-noise ratio for the detection of lightcone projection effects in the bispectrum. Furthermore, we perform information matrix forecasts on the local PNG parameter, fNL, and on the parametrised amplitudes of the relativistic corrections. Finally, we quantify the bias on the measurement of fNL that arises from neglecting relativistic effects. Our results show that detections of both first- and second-order relativistic effects are promising with forthcoming spectroscopic survey specifications — and are largely unaffected by the uncertainty in fNL. Conversely, we show for the first time that neglecting relativistic corrections in the galaxy bispectrum can lead to a shift >1.5σ(fNL) on the detected value of fNL, highlighting the importance of including relativistic effects in our modelling.","PeriodicalId":15445,"journal":{"name":"Journal of Cosmology and Astroparticle Physics","volume":"66 1","pages":""},"PeriodicalIF":6.4,"publicationDate":"2025-07-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144645467","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

The spectrum of gravitational waves from annihilating domain walls 湮灭畴壁产生的引力波谱

IF 6.4 2区物理与天体物理

Journal of Cosmology and Astroparticle Physics Pub Date : 2025-07-15 DOI: 10.1088/1475-7516/2025/07/049

Alessio Notari, Fabrizio Rompineve and Francisco Torrenti

{"title":"The spectrum of gravitational waves from annihilating domain walls","authors":"Alessio Notari, Fabrizio Rompineve and Francisco Torrenti","doi":"10.1088/1475-7516/2025/07/049","DOIUrl":"https://doi.org/10.1088/1475-7516/2025/07/049","url":null,"abstract":"Networks of cosmic domain walls can form in the early Universe as a consequence of the spontaneous breaking of discrete symmetries. We study the production of a cosmological background of gravitational waves (GWs) from such networks, when they annihilate due to a small explicit symmetry breaking term. Averaging over several 3+1-dimensional high-resolution lattice field simulations, we obtain a GW spectrum with the following characteristics: (1) a broad asymmetric peak, roughly located at frequency (at the time of emission) f ∼ 2Hgw, where Hgw is the Hubble rate at the end of GW production, shortly after annihilation, (2) a doubly broken power law spectrum ∝ k-n, with initial slope n ∼ 0.5 after the main peak and n ∼ 1.8 at high f, while the low frequency region f < fp agrees with the causality behavior ∼ k3. Additionally, extending previous results, we find that GW production continues to be efficient until a value of the Hubble scale Hgw that is roughly an order of magnitude smaller than the naive estimate σH = ΔV, where σ is the wall tension and ΔV, the size of the symmetry breaking term, thereby leading to a O(100) larger GW signal. We find such results to be robust when changing the shape of the scalar field potential or including a time-dependent symmetry breaking term. Our findings have important implications for GW searches, especially in light of the reported evidence for a stochastic GW background in Pulsar Timing Array data.","PeriodicalId":15445,"journal":{"name":"Journal of Cosmology and Astroparticle Physics","volume":"15 1","pages":""},"PeriodicalIF":6.4,"publicationDate":"2025-07-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144640079","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