Journal of Cosmology and Astroparticle Physics最新文献_第2页

The nonlinear tails in black hole ringdown: the scattering perspective 黑洞衰荡中的非线性尾：散射视角

IF 6.4 2区物理与天体物理

Journal of Cosmology and Astroparticle Physics Pub Date : 2025-10-14 DOI: 10.1088/1475-7516/2025/10/062

A. Ianniccari, L. Lo Bianco and A. Riotto

引用次数: 0

Graviton-photon conversion in blazar jets as a probe of high-frequency gravitational waves 作为高频引力波探测的耀变体喷流中的重子-光子转换

IF 6.4 2区物理与天体物理

Journal of Cosmology and Astroparticle Physics Pub Date : 2025-10-14 DOI: 10.1088/1475-7516/2025/10/061

Himeka Matsuo and Asuka Ito

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Can we hear beats with pulsar timing arrays? 我们能用脉冲星定时阵列听到节拍吗？

IF 6.4 2区物理与天体物理

Journal of Cosmology and Astroparticle Physics Pub Date : 2025-10-14 DOI: 10.1088/1475-7516/2025/10/058

Shun Yamamoto and Hideki Asada

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Numerical treatment of annual modulation of relic neutrinos 残中微子年调制的数值处理

IF 6.4 2区物理与天体物理

Journal of Cosmology and Astroparticle Physics Pub Date : 2025-10-14 DOI: 10.1088/1475-7516/2025/10/059

Fabian Zimmer and Shin'ichiro Ando

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Primordial black holes and magnetic fields in conformal neutrino mass models 保形中微子质量模型中的原始黑洞和磁场

IF 6.4 2区物理与天体物理

Journal of Cosmology and Astroparticle Physics Pub Date : 2025-10-14 DOI: 10.1088/1475-7516/2025/10/064

Shyam Balaji, João Gonçalves, Danny Marfatia, António P. Morais and Roman Pasechnik

{"title":"Primordial black holes and magnetic fields in conformal neutrino mass models","authors":"Shyam Balaji, João Gonçalves, Danny Marfatia, António P. Morais and Roman Pasechnik","doi":"10.1088/1475-7516/2025/10/064","DOIUrl":"https://doi.org/10.1088/1475-7516/2025/10/064","url":null,"abstract":"Sufficiently strong and long-lasting first-order phase transitions can produce primordial black holes (PBHs) that contribute substantially to the dark matter abundance of the Universe, and can produce large-scale primordial magnetic fields. We study these mechanisms in a generic class of conformal U(1)' models that also explain active neutrino oscillation data via the type-I seesaw mechanism. We find that phase transitions that occur at seesaw scales between 104 GeV and 1011 GeV produce gravitational wave signals (from the dynamics of the phase transition and from the decay of cosmic string loops) at LISA/ET that can be correlated with microlensing signals of PBHs at the Roman Space Telescope, while scales near 1011 GeV can be correlated with Hawking evaporation signals at future gamma-ray telescopes. LISA can probe the entire range of PBH masses between 1 × 10-16M⊙ and 8 × 10-11M⊙ if PBHs fully account for the dark matter abundance. For Z' masses between 40 TeV and 104 TeV, and 10 TeV right-handed neutrinos, helical magnetic fields can be produced with magnitudes ≳ 0.5 pG and coherence lengths ≳ 0.008 Mpc, above current blazar lower bounds.","PeriodicalId":15445,"journal":{"name":"Journal of Cosmology and Astroparticle Physics","volume":"154 1","pages":""},"PeriodicalIF":6.4,"publicationDate":"2025-10-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145289391","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

Forecasts for interacting dark energy with time-dependent momentum exchange 暗能量与时变动量交换相互作用的预测

IF 6.4 2区物理与天体物理

Journal of Cosmology and Astroparticle Physics Pub Date : 2025-10-13 DOI: 10.1088/1475-7516/2025/10/052

Nathan Cruickshank, Robert Crittenden, Kazuya Koyama and Marco Bruni

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On the impacts of halo model implementations in Sunyaev-Zeldovich cross-correlation analyses Sunyaev-Zeldovich互相关分析中晕轮模型实现的影响

IF 6.4 2区物理与天体物理

Journal of Cosmology and Astroparticle Physics Pub Date : 2025-10-13 DOI: 10.1088/1475-7516/2025/10/051

Chad Popik, Nicholas Battaglia, Aleksandra Kusiak, Boris Bolliet and J. Colin Hill

{"title":"On the impacts of halo model implementations in Sunyaev-Zeldovich cross-correlation analyses","authors":"Chad Popik, Nicholas Battaglia, Aleksandra Kusiak, Boris Bolliet and J. Colin Hill","doi":"10.1088/1475-7516/2025/10/051","DOIUrl":"https://doi.org/10.1088/1475-7516/2025/10/051","url":null,"abstract":"Statistical studies of the circumgalactic medium (CGM) using Sunyaev-Zeldovich (SZ) observations offer a promising method of studying the gas properties of galaxies and the astrophysics that govern their evolution. Forward modeling profiles from theory and simulations allows them to be refined directly off of data, but there are currently significant differences between the thermal SZ (tSZ) observations of the CGM and the predicted tSZ signal. While these discrepancies could be real, they could also be the result of decisions in the forward modeling used to build statistical measures from theory. In order to see effects of this, we compare an analysis utilizing halo occupancy distributions (HODs) implemented in halo models to simulate the galaxy distribution against previous studies, which weighted their results to match the CMASS galaxy sample, which contains nearly one million galaxies, mainly centrals of group-sized halos, selected for relatively uniform stellar mass across redshifts between 0.4 < z < 0.7. We review some of the implementation differences that can account for changes, such as miscentering, one-halo/two-halo cutoff radii, and mass ranges, all of which will need to be given the proper attention in future high-signal-to-noise studies. We find that our more thorough model predicts a signal with a 33% improved fit than the one from previous studies on the exact same sample. Additionally, we find that modifications that change the satellite fraction even by just a few percent, such as editing the halo mass range and certain HOD parameters, result in strong changes in the final signal. Although significant, this discrepancy from the modeling choices is not large enough to completely account for the existing disagreements between simulations and measurements.","PeriodicalId":15445,"journal":{"name":"Journal of Cosmology and Astroparticle Physics","volume":"38 1","pages":""},"PeriodicalIF":6.4,"publicationDate":"2025-10-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145282904","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

Quasinormal modes from EFT of black hole perturbations in vector-tensor gravity 矢量张量引力中黑洞摄动的EFT拟正态模

IF 6.4 2区物理与天体物理

Journal of Cosmology and Astroparticle Physics Pub Date : 2025-10-13 DOI: 10.1088/1475-7516/2025/10/056

Shogo Tomizuka, Hajime Kobayashi, Naritaka Oshita, Kazufumi Takahashi and Shinji Mukohyama

引用次数: 0

Anatomy of singlet-doublet dark matter relic: annihilation, co-annihilation, co-scattering, and freeze-in 单重态-双重态暗物质遗迹的解剖：湮灭、共湮灭、共散射和冻结

IF 6.4 2区物理与天体物理

Journal of Cosmology and Astroparticle Physics Pub Date : 2025-10-13 DOI: 10.1088/1475-7516/2025/10/053

Partha Kumar Paul, Sujit Kumar Sahoo and Narendra Sahu

{"title":"Anatomy of singlet-doublet dark matter relic: annihilation, co-annihilation, co-scattering, and freeze-in","authors":"Partha Kumar Paul, Sujit Kumar Sahoo and Narendra Sahu","doi":"10.1088/1475-7516/2025/10/053","DOIUrl":"https://doi.org/10.1088/1475-7516/2025/10/053","url":null,"abstract":"The singlet-doublet vector-like fermion dark matter model has been extensively studied in the literature over the past decade. An important parameter in this model is the singlet-doublet mixing angle (sinθ). All the previous studies have primarily focused on annihilation and co-annihilation processes for obtaining the correct dark matter relic density, assuming that the singlet and doublet components decouple at the same epoch. In this work, we demonstrate that this assumption holds only for larger mixing angles with a dependency on the mass of the dark matter. However, it badly fails for the mixing angle sinθ < 0.05. We present a systematic study of the parameter space of the singlet-doublet dark matter relic, incorporating annihilation, co-annihilation, and, for the first time, co-scattering processes. Additionally, non-thermal productions via the freeze-in and SuperWIMP mechanism are also explored. We found that due to the inclusion of co-scattering processes, the correct relic density parameter space is shifted towards the detection sensitivity range of the LHC and MATHUSLA via displaced vertex signatures.","PeriodicalId":15445,"journal":{"name":"Journal of Cosmology and Astroparticle Physics","volume":"6 1","pages":""},"PeriodicalIF":6.4,"publicationDate":"2025-10-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145282938","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

Signatures of Einstein-Maxwell dilaton-axion gravity from the observed quasi-periodic oscillations in black holes 黑洞中观测到的准周期振荡的爱因斯坦-麦克斯韦膨胀-轴子引力特征

IF 6.4 2区物理与天体物理

Journal of Cosmology and Astroparticle Physics Pub Date : 2025-10-13 DOI: 10.1088/1475-7516/2025/10/054

Anirban Dasgupta, Nishant Tiwari and Indrani Banerjee

{"title":"Signatures of Einstein-Maxwell dilaton-axion gravity from the observed quasi-periodic oscillations in black holes","authors":"Anirban Dasgupta, Nishant Tiwari and Indrani Banerjee","doi":"10.1088/1475-7516/2025/10/054","DOIUrl":"https://doi.org/10.1088/1475-7516/2025/10/054","url":null,"abstract":"String-inspired models are often believed to provide an interesting framework for quantum gravity and force unification with promising prospects to resolve issues like dark matter and dark energy, which cannot be satisfactorily incorporated within the framework of general relativity (GR). The goal of the present work is to investigate the role of the Einstein-Maxwell dilaton-axion (EMDA) gravity arising in the low-energy effective action of the heterotic string theory in explaining astrophysical observations, in particular, the high-frequency quasi-periodic oscillations (HFQPOs) observed in the power spectrum of black holes. EMDA gravity has interesting cosmological implications, and hence it is worthwhile to explore the footprints of such a theory in available astrophysical observations. This requires one to study the stationary, axi-symmetric black hole solution in EMDA gravity, which corresponds to the Kerr-Sen spacetime. Such black holes are endowed with a dilatonic charge while the rotation is sourced from the axionic field. We investigate the orbital and epicyclic frequencies of matter rotating in the Kerr-Sen spacetime and consider eleven well-studied QPO models in this work. We compare the model-dependent QPO frequencies with the available observations of five BH sources, namely, XTE J1550-564, GRS 1915+105, H 143+322, GRO J1655-40 and Sgr A*. Our analysis provides constraints on the spins of the aforesaid black holes which, when compared with previous estimates, enables us to understand the observationally favored QPO models for each of these sources. Further, from the current data, the EMDA scenario cannot be ruled out in favor of general relativity. We comment on the implications and limitations of our findings and how the present constrains compare with the existing literature.","PeriodicalId":15445,"journal":{"name":"Journal of Cosmology and Astroparticle Physics","volume":"1 1","pages":""},"PeriodicalIF":6.4,"publicationDate":"2025-10-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145282939","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