Journal of Cosmology and Astroparticle Physics最新文献_第9页

Interacting models of dark energy and dark matter in Einstein scalar Gauss Bonnet gravity 爱因斯坦标量高斯-波奈引力中的暗能量和暗物质相互作用模型

IF 6.4 2区物理与天体物理

Journal of Cosmology and Astroparticle Physics Pub Date : 2024-11-26 DOI: 10.1088/1475-7516/2024/11/042

Saddam Hussain, Simran Arora, Yamuna Rana, Benjamin Rose and Anzhong Wang

{"title":"Interacting models of dark energy and dark matter in Einstein scalar Gauss Bonnet gravity","authors":"Saddam Hussain, Simran Arora, Yamuna Rana, Benjamin Rose and Anzhong Wang","doi":"10.1088/1475-7516/2024/11/042","DOIUrl":"https://doi.org/10.1088/1475-7516/2024/11/042","url":null,"abstract":"We study the dynamics of the interacting models between the Gauss-Bonnet (GB) coupled scalar field and the dark matter fluid in a homogeneous and isotropic background. A key feature of GB coupling models is the varying speed of gravitational waves (GWs). We utilize recent constraints on the GW speed and conduct our analysis in two primary scenarios: model-dependent and model-independent. In the model-dependent scenario, where determining the GW speed requires a specific GB coupling functional form, we choose an exponential GB coupling. We adopt a dynamical system analysis to obtain the necessary constraints on the model parameters that describe different phases of the universe and produce a stable late-time accelerating solution following the GW constraint, and find that to satisfy all these constraints, fine-tuning of the free parameters involved in the models is often needed. In the model-independent scenario, the GW speed is fixed to one, and we construct the autonomous system to identify the late-time stable accelerating critical points. Furthermore, we adopt a Bayesian inference method using late-time observational data sets, including 31 data points from cosmic chronometer data (Hubble data) and 1701 data points from Pantheon+ and find that all the observational constraints can be satisfied without fine-tuning. In addition, we also utilize simulated binned Roman and LSST data to study the evolution of the universe in the model-independent scenario. We find that the model shows significant deviation at higher redshifts from ΛCDM and fits the current data much better than ΛCDM within the error bars.","PeriodicalId":15445,"journal":{"name":"Journal of Cosmology and Astroparticle Physics","volume":"24 1","pages":""},"PeriodicalIF":6.4,"publicationDate":"2024-11-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142713031","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

Relativistic interacting fluids in cosmology 宇宙学中的相对论相互作用流体

IF 6.4 2区物理与天体物理

Journal of Cosmology and Astroparticle Physics Pub Date : 2024-11-26 DOI: 10.1088/1475-7516/2024/11/043

Damianos Iosifidis, Erik Jensko and Tomi S. Koivisto

引用次数: 0

The effect of quantum decoherence on inflationary gravitational waves 量子退相干对膨胀引力波的影响

IF 6.4 2区物理与天体物理

Journal of Cosmology and Astroparticle Physics Pub Date : 2024-11-26 DOI: 10.1088/1475-7516/2024/11/041

Jessie de Kruijf and Nicola Bartolo

{"title":"The effect of quantum decoherence on inflationary gravitational waves","authors":"Jessie de Kruijf and Nicola Bartolo","doi":"10.1088/1475-7516/2024/11/041","DOIUrl":"https://doi.org/10.1088/1475-7516/2024/11/041","url":null,"abstract":"The theory of inflation provides a mechanism to explain the structures we observe today in the Universe, starting from quantum-mechanically generated fluctuations. However, this leaves the question of: how did the quantum-to-classical transition, occur? During inflation, tensor perturbations interact (at least gravitationally) with other fields, meaning that we need to view these perturbations as an open system that interacts with an environment. In this paper, the evolution of the system is described using a Lindblad equation, which describes the quantum decoherence of the system. This is a possible mechanism for explaining the quantum-to-classical transition. We show that this quantum decoherence during a de Sitter phase leads to a scale-dependent increase of the gravitational wave power spectrum, depending on the strength and time dependence of the interaction between the system and the environment. By using current upper bounds on the gravitational wave power spectrum from inflation, obtained from CMB and the LIGO-Virgo-KAGRA constraints, we find an upper bound on the interaction strength. Furthermore, we compute the decoherence criterion, which indicates the minimal interaction strength needed for a specific scale to have successfully decohered by the end of inflation. Assuming that the CMB modes have completely decohered, we indicate a lower bound on the interaction strength. In addition, this decoherence criterion allows us to look at which scales might not have fully decohered and could still show some relic quantum signatures. Lastly, we use sensitivity forecasts to study how future gravitational-wave detectors, such as LISA and ET, could constrain the decoherence parameter space. Due to the scale-dependence of the power spectrum, LISA could only have a very small impact. However, ET will be able to significantly improve our current constraints for specific decoherence scenarios.","PeriodicalId":15445,"journal":{"name":"Journal of Cosmology and Astroparticle Physics","volume":"25 1","pages":""},"PeriodicalIF":6.4,"publicationDate":"2024-11-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142713242","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

Kerr black hole mimickers sourced by a string fluid 由弦流体产生的克尔黑洞模仿器

IF 6.4 2区物理与天体物理

Journal of Cosmology and Astroparticle Physics Pub Date : 2024-11-26 DOI: 10.1088/1475-7516/2024/11/044

Ram Brustein, A.J.M. Medved and Tamar Simhon

{"title":"Kerr black hole mimickers sourced by a string fluid","authors":"Ram Brustein, A.J.M. Medved and Tamar Simhon","doi":"10.1088/1475-7516/2024/11/044","DOIUrl":"https://doi.org/10.1088/1475-7516/2024/11/044","url":null,"abstract":"We present rotating solutions of Einstein's gravity coupled to an effective Born-Infeld theory that describes the end of open-string tachyon condensation after the decay of an unstable D-brane or a brane-antibrane system. The geometry of these solutions is that of the rotating frozen star. The solutions are stationary, ultracompact, can be made non-singular via a regularization procedure and their exterior geometry is identical, for all practical purposes, to that of the Kerr solution. The Born-Infeld matter consists of radial electric-flux tubes that emanate from, or end at, the ellipsoidal core of the star. Each end of the flux tubes carries an electric charge, so that the electric field can be viewed as being sourced by an ellipsoidal charge distribution of positive and negative charges near the center of the star. Meanwhile, the star's outer layer is equal and oppositely charged, resulting in a vanishing electric field in the external spacetime. We show that these rotating solutions are ultrastable against radial perturbations, just like their static frozen star counterparts. They are also effectively immune to ergoregion instabilities, as we discuss.","PeriodicalId":15445,"journal":{"name":"Journal of Cosmology and Astroparticle Physics","volume":"1 1","pages":""},"PeriodicalIF":6.4,"publicationDate":"2024-11-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142713032","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

Implication of nano-Hertz stochastic gravitational wave background on ultralight axion particles 纳赫兹随机引力波背景对超轻轴心粒子的影响

IF 6.4 2区物理与天体物理

Journal of Cosmology and Astroparticle Physics Pub Date : 2024-11-26 DOI: 10.1088/1475-7516/2024/11/045

Jing Yang, Ning Xie and Fa Peng Huang

引用次数: 0

Dark matter (h)eats young planets 暗物质（吃）年轻行星

IF 6.4 2区物理与天体物理

Journal of Cosmology and Astroparticle Physics Pub Date : 2024-11-26 DOI: 10.1088/1475-7516/2024/11/046

Djuna Croon and Juri Smirnov

引用次数: 0

Relativistic Khronon theory in agreement with modified Newtonian dynamics and large-scale cosmology 与修正牛顿动力学和大尺度宇宙学一致的相对论 Khronon 理论

IF 6.4 2区物理与天体物理

Journal of Cosmology and Astroparticle Physics Pub Date : 2024-11-22 DOI: 10.1088/1475-7516/2024/11/040

Luc Blanchet and Constantinos Skordis

引用次数: 0

The stochastic gravitational wave background from primordial gravitational atoms 来自原始引力原子的随机引力波背景

IF 6.4 2区物理与天体物理

Journal of Cosmology and Astroparticle Physics Pub Date : 2024-11-22 DOI: 10.1088/1475-7516/2024/11/039

Zhaofeng Kang, Tianjun Li and Weitao Ye

{"title":"The stochastic gravitational wave background from primordial gravitational atoms","authors":"Zhaofeng Kang, Tianjun Li and Weitao Ye","doi":"10.1088/1475-7516/2024/11/039","DOIUrl":"https://doi.org/10.1088/1475-7516/2024/11/039","url":null,"abstract":"We propose a scenario of primordial gravitational atoms (PGAs), which may exist in the current and past universe due to spinning primordial black holes (PBHs) and very light bosonic fields. In a monochromatic mass scenario with a sizable dimensionless spin, which may arise in a short matter dominated (MD) era, we analyze the resulting stochastic gravitational wave background (SGWB) signal. Its spectrum is approximately characterized by a rising ∝ f3 followed by a falling ∝ f-1 where f is the frequency. Then, we investigate the constraints and prospects of such an SGWB, and find that PGAs with a core mass MBH ∼ 𝒪(10) M⊙ and a cloud of light scalar with mass μ ∼ 𝒪 (10-13) eV could yield constraints even stronger than those from bare PBHs. Future detectors such as LISA, Taiji and TianQin are able to explore PGAs over a narrow and elongated strap in the (μ,MBH) plane, spanning over 10 orders of magnitude for the maximum spin, 10-8M⊙ ≲ MBH ≲ 104M⊙, 10-16 eV ≲ μ ≲ 10-3 eV. If the PGA is dressed with a vector cloud, the SGWB signal has a much better opportunity to be probed.","PeriodicalId":15445,"journal":{"name":"Journal of Cosmology and Astroparticle Physics","volume":"16 1","pages":""},"PeriodicalIF":6.4,"publicationDate":"2024-11-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142684239","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

Vetting quark-star models with gravitational waves in the hierarchical Bayesian framework 在分层贝叶斯框架中用引力波检验夸克星模型

IF 6.4 2区物理与天体物理

Journal of Cosmology and Astroparticle Physics Pub Date : 2024-11-22 DOI: 10.1088/1475-7516/2024/11/038

Ziming Wang, Yong Gao, Dicong Liang, Junjie Zhao and Lijing Shao

{"title":"Vetting quark-star models with gravitational waves in the hierarchical Bayesian framework","authors":"Ziming Wang, Yong Gao, Dicong Liang, Junjie Zhao and Lijing Shao","doi":"10.1088/1475-7516/2024/11/038","DOIUrl":"https://doi.org/10.1088/1475-7516/2024/11/038","url":null,"abstract":"The recent discovery of gravitational waves (GWs) has opened a new avenue for investigating the equation of state (EOS) of dense matter in compact stars, which is an outstanding problem in astronomy and nuclear physics. In the future, next-generation (XG) GW detectors will be constructed, deemed to provide a large number of high-precision observations. We investigate the potential of constraining the EOS of quark stars (QSs) with high-precision measurements of mass m and tidal deformability Λ from the XG GW observatories. We adopt the widely-used bag model for QSs, consisting of four microscopic parameters: the effective bag constant Beff, the perturbative quantum chromodynamics correction parameter a4, the strange quark mass ms, and the pairing energy gap Δ. With the help of hierarchical Bayesian inference, for the first time we are able to infer the EOS of QSs combining multiple GW observations. Using the top 25 loudest GW events in our simulation, we find that, the constraints on Beff and Δ are tightened by several times, while a4 and ms are still poorly constrained. We also study a simplified 2-dimensional (2-d) EOS model which was recently proposed in literature. The 2-d model is found to exhibit significant parameter-estimation biases as more GW events are analyzed, while the predicted m–Λ relation remains consistent with the full model.","PeriodicalId":15445,"journal":{"name":"Journal of Cosmology and Astroparticle Physics","volume":"2 1","pages":""},"PeriodicalIF":6.4,"publicationDate":"2024-11-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142684482","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

Model independent approach for calculating galaxy rotation curves for low S/N MaNGA galaxies 计算低信噪比 MaNGA 星系旋转曲线的独立模型方法

IF 6.4 2区物理与天体物理

Journal of Cosmology and Astroparticle Physics Pub Date : 2024-11-22 DOI: 10.1088/1475-7516/2024/11/037

Sangwoo Park, Arman Shafieloo, Satadru Bag, Mikhail Denissenya, Eric V. Linder and Adarsh Ranjan

引用次数: 0