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On marginals and profiled posteriors for cosmological parameter estimation 关于宇宙学参数估计的边际和剖面后验
IF 6.4 2区 物理与天体物理
Journal of Cosmology and Astroparticle Physics Pub Date : 2024-11-21 DOI: 10.1088/1475-7516/2024/11/035
Martin Kerscher and Jochen Weller
{"title":"On marginals and profiled posteriors for cosmological parameter estimation","authors":"Martin Kerscher and Jochen Weller","doi":"10.1088/1475-7516/2024/11/035","DOIUrl":"https://doi.org/10.1088/1475-7516/2024/11/035","url":null,"abstract":"With several examples and in an analysis of the Pantheon+ supernova sample we discuss the properties of the marginal posterior distribution versus the profiled posterior distribution — the profile likelihood in a Bayesian disguise. We investigate whether maximisation, as used for the profiling, or integration, as used for the marginalisation, is more appropriate. To report results we recommend the marginal posterior distribution.","PeriodicalId":15445,"journal":{"name":"Journal of Cosmology and Astroparticle Physics","volume":"13 1","pages":""},"PeriodicalIF":6.4,"publicationDate":"2024-11-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142678531","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
Teleparallel geometry with spherical symmetry: the diagonal and proper frames 具有球面对称性的远平行几何：对角线框架和适当框架
IF 6.4 2区 物理与天体物理
Journal of Cosmology and Astroparticle Physics Pub Date : 2024-11-21 DOI: 10.1088/1475-7516/2024/11/033
R.J. van den Hoogen and H. Forance
{"title":"Teleparallel geometry with spherical symmetry: the diagonal and proper frames","authors":"R.J. van den Hoogen and H. Forance","doi":"10.1088/1475-7516/2024/11/033","DOIUrl":"https://doi.org/10.1088/1475-7516/2024/11/033","url":null,"abstract":"We present the proper co-frame and its corresponding (diagonal) co-frame/spin connection pair for spherically symmetric geometries which can be used as an initial ansatz in any theory of teleparallel gravity. The Lorentz transformation facilitating the move from one co-frame to the other is also presented in factored form. The factored form also illustrates the nature of the two degrees of freedom found in the spin connection. The choice of coordinates in restricting the number of arbitrary functions is also presented. Beginning with a thorough presentation of teleparallel gravity using the metric affine gauge theory approach and concentrating on f(T) teleparallel gravity, we express the field equations in the diagonal co-frame. We argue that the choice of diagonal co-frame may be more advantageous over the proper co-frame choice. Finally, assuming one additional symmetry, we restrict ourselves to the Kantowski-Sachs teleparallel geometries, and determine some solutions.","PeriodicalId":15445,"journal":{"name":"Journal of Cosmology and Astroparticle Physics","volume":"14 1","pages":""},"PeriodicalIF":6.4,"publicationDate":"2024-11-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142678528","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
Efficient hybrid technique for generating sub-grid haloes in reionization simulations 在再电离模拟中生成子网格晕的高效混合技术
IF 6.4 2区 物理与天体物理
Journal of Cosmology and Astroparticle Physics Pub Date : 2024-11-21 DOI: 10.1088/1475-7516/2024/11/036
Ankur Barsode and Tirthankar Roy Choudhury
{"title":"Efficient hybrid technique for generating sub-grid haloes in reionization simulations","authors":"Ankur Barsode and Tirthankar Roy Choudhury","doi":"10.1088/1475-7516/2024/11/036","DOIUrl":"https://doi.org/10.1088/1475-7516/2024/11/036","url":null,"abstract":"Simulating the distribution of cosmological neutral hydrogen (HI) during the epoch of reionization requires a high dynamic range and is hence computationally expensive. The size of the simulation is dictated by the largest scales one aims to probe, while the resolution is determined by the smallest dark matter haloes capable of hosting the first stars. We present a hybrid approach where the density and tidal fields of a large-volume, low-resolution simulation are combined with small haloes from a small-volume, high-resolution box. By merging these two boxes of relatively lower dynamic range, we achieve an effective high-dynamic range simulation using only 13% of the computational resources required for a full high-dynamic range simulation. Our method accurately reproduces the one- and two-point statistics of the halo field, its cross-correlation with the dark matter density field, and the two-point statistics of the HI field computed using a semi-numerical code, all within 10% accuracy at large scales and across different redshifts. Our technique, combined with semi-numerical models of reionization, provides a resource-efficient tool for modeling the HI distribution at high redshifts.","PeriodicalId":15445,"journal":{"name":"Journal of Cosmology and Astroparticle Physics","volume":"81 1","pages":""},"PeriodicalIF":6.4,"publicationDate":"2024-11-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142678532","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
Constructing viable interacting dark matter and dark energy models: a dynamical systems approach 构建可行的相互作用暗物质和暗能量模型：一种动力系统方法
IF 6.4 2区 物理与天体物理
Journal of Cosmology and Astroparticle Physics Pub Date : 2024-11-21 DOI: 10.1088/1475-7516/2024/11/034
Ashmita, Kinjal Banerjee and Prasanta Kumar Das
{"title":"Constructing viable interacting dark matter and dark energy models: a dynamical systems approach","authors":"Ashmita, Kinjal Banerjee and Prasanta Kumar Das","doi":"10.1088/1475-7516/2024/11/034","DOIUrl":"https://doi.org/10.1088/1475-7516/2024/11/034","url":null,"abstract":"We study the evolution of k = -1 FLRW cosmological models for two interacting Dark Matter-Dark Energy Models using dynamical system analysis. Since we are interested in late time evolution, the sign of the interaction term is chosen such that it facilitates the transfer of energy from dark matter to dark energy. We also explore the k = 0 invariant subspace of these models. We find that both these models have sectors which have a stable fixed point where we can recover an accelerating universe with a negative equation of state. This indicates these can be viable models for our universe. We also rule out certain sectors of these models because they do not give the correct late time observational features. We observe that although we start with a dust-like Dark Matter, its effective equation of state evolves due to its interaction with Dark Energy. As a result, the Dark Matter can display features of stiff matter and exotic matter in the course of evolution.","PeriodicalId":15445,"journal":{"name":"Journal of Cosmology and Astroparticle Physics","volume":"57 1","pages":""},"PeriodicalIF":6.4,"publicationDate":"2024-11-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142678534","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 waves from inflation in LISA: reconstruction pipeline and physics interpretation LISA中来自通货膨胀的引力波：重建管道和物理学解释
IF 6.4 2区 物理与天体物理
Journal of Cosmology and Astroparticle Physics Pub Date : 2024-11-20 DOI: 10.1088/1475-7516/2024/11/032
Matteo Braglia, Gianluca Calcagni, Gabriele Franciolini, Jacopo Fumagalli, Germano Nardini, Marco Peloso, Mauro Pieroni, Sébastien Renaux-Petel, Angelo Ricciardone, Gianmassimo Tasinato, Ville Vaskonen and the LISA Cosmology Working Group
{"title":"Gravitational waves from inflation in LISA: reconstruction pipeline and physics interpretation","authors":"Matteo Braglia, Gianluca Calcagni, Gabriele Franciolini, Jacopo Fumagalli, Germano Nardini, Marco Peloso, Mauro Pieroni, Sébastien Renaux-Petel, Angelo Ricciardone, Gianmassimo Tasinato, Ville Vaskonen and the LISA Cosmology Working Group","doi":"10.1088/1475-7516/2024/11/032","DOIUrl":"https://doi.org/10.1088/1475-7516/2024/11/032","url":null,"abstract":"Various scenarios of cosmic inflation enhance the amplitude of the stochastic gravitational wave background (SGWB) at frequencies detectable by the LISA detector. We develop tools for a template-based analysis of the SGWB and introduce a template databank to describe well-motivated signals from inflation, prototype their template-based searches, and forecast their reconstruction with LISA. Specifically, we classify seven templates based on their signal frequency shape, and we identify representative fundamental physics models leading to them. By running a template-based analysis, we forecast the accuracy with which LISA can reconstruct the template parameters of representative benchmark signals, with and without galactic and extragalactic foregrounds. We identify the parameter regions that can be probed by LISA within each template. Finally, we investigate how our signal reconstructions shed light on fundamental physics models of inflation: we discuss their impact for measurements of e.g., the couplings of inflationary axions to gauge fields; the graviton mass during inflation; the fluctuation seeds of primordial black holes; the consequences of excited states during inflation, and the presence of small-scale spectral features.","PeriodicalId":15445,"journal":{"name":"Journal of Cosmology and Astroparticle Physics","volume":"178 1","pages":""},"PeriodicalIF":6.4,"publicationDate":"2024-11-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142673360","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 speed limit on tachyon fields from cosmological and fine-structure data 从宇宙学和精细结构数据看超速子场的速度限制
IF 6.4 2区 物理与天体物理
Journal of Cosmology and Astroparticle Physics Pub Date : 2024-11-20 DOI: 10.1088/1475-7516/2024/11/030
J.D.F. Dias, Nils Schöneberg, Léo Vacher, C.J.A.P. Martins and Samy Vinzl
{"title":"A speed limit on tachyon fields from cosmological and fine-structure data","authors":"J.D.F. Dias, Nils Schöneberg, Léo Vacher, C.J.A.P. Martins and Samy Vinzl","doi":"10.1088/1475-7516/2024/11/030","DOIUrl":"https://doi.org/10.1088/1475-7516/2024/11/030","url":null,"abstract":"The rolling tachyon is a non-canonical scalar field model well motivated in string theory which naturally predicts variations of the fine-structure constant. Such variations can in principle lead to interesting observable consequences, but they can also lead to extremely tight constraints on these kinds of models. In this work we subject the rolling tachyon model evolving in a variety of potentials to current data and show that most cosmologically interesting evolutions are already strongly excluded. We find |1 + w0| < 10-3 from cosmological data and |1 + w0| < 10-9 from fine-structure data, leaving the rolling tachyon to either play a role almost entirely equivalent to a cosmological constant or that of a test field. We also find that in most of the allowed parameter space the field evolves very slowly, allowing its evolution to be approximated as an equivalent canonical scalar field.","PeriodicalId":15445,"journal":{"name":"Journal of Cosmology and Astroparticle Physics","volume":"229 1","pages":""},"PeriodicalIF":6.4,"publicationDate":"2024-11-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142673326","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
Proper time path integrals for gravitational waves: an improved wave optics framework 引力波的适当时间路径积分：改进的波光学框架
IF 6.4 2区 物理与天体物理
Journal of Cosmology and Astroparticle Physics Pub Date : 2024-11-20 DOI: 10.1088/1475-7516/2024/11/031
Ginevra Braga, Alice Garoffolo, Angelo Ricciardone, Nicola Bartolo and Sabino Matarrese
{"title":"Proper time path integrals for gravitational waves: an improved wave optics framework","authors":"Ginevra Braga, Alice Garoffolo, Angelo Ricciardone, Nicola Bartolo and Sabino Matarrese","doi":"10.1088/1475-7516/2024/11/031","DOIUrl":"https://doi.org/10.1088/1475-7516/2024/11/031","url":null,"abstract":"When gravitational waves travel from their source to an observer, they interact with matter structures along their path, causing distinct deformations in their waveforms. In this study we introduce a novel theoretical framework for wave optics effects in gravitational lensing, addressing the limitations of existing approaches. We achieve this by incorporating the proper time technique, typically used in field theory studies, into gravitational lensing. This approach allows us to extend the standard formalism beyond the eikonal and paraxial approximations, which are traditionally assumed, and to account for polarization effects, which are typically neglected in the literature. We demonstrate that our method provides a robust generalization of conventional approaches, including them as special cases. Our findings enhance our understanding of gravitational wave propagation, which is crucial for accurately interpreting gravitational wave observations and extracting unbiased information about the lenses from the gravitational wave waveforms.","PeriodicalId":15445,"journal":{"name":"Journal of Cosmology and Astroparticle Physics","volume":"178 1","pages":""},"PeriodicalIF":6.4,"publicationDate":"2024-11-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142673327","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
Consistent theories for the DESI dark energy fit DESI暗能量拟合的一致理论
IF 6.4 2区 物理与天体物理
Journal of Cosmology and Astroparticle Physics Pub Date : 2024-11-19 DOI: 10.1088/1475-7516/2024/11/025
Alessio Notari, Michele Redi and Andrea Tesi
{"title":"Consistent theories for the DESI dark energy fit","authors":"Alessio Notari, Michele Redi and Andrea Tesi","doi":"10.1088/1475-7516/2024/11/025","DOIUrl":"https://doi.org/10.1088/1475-7516/2024/11/025","url":null,"abstract":"We search for physically consistent realizations of evolving dark energy suggested by the cosmological fit of DESI, Planck and Supernovae data. First we note that any lagrangian description of the standard Chevallier-Polarski-Linder (CPL) parametrization for the dark energy equation of state w, allows for the addition of a cosmological constant. We perform the cosmological fit finding new regions of parameter space that however continue to favour dark energy with w < -1 at early times, that is challenging to realize in consistent theories. Next, in the spirit of effective field theories, we consider the effect of higher order terms in the Taylor expansion of the equation of state of dark energy around the present epoch. We find that non-linear corrections of the equation of state are weakly constrained, thus opening the way to scenarios that differ from CPL at early times, possibly with w > -1 at all times. We present indeed scenarios where evolving dark energy can be realized through quintessence models. We introduce in particular the ramp model where dark energy coincides with CPL at late times and approximates to a cosmological constant at early times. The latter model provides a much better fit than ΛCDM, and only slightly worse than w0waCDM, but with the notable advantage of being described by a simple and theoretically consistent lagrangian of a canonical quintessence model.","PeriodicalId":15445,"journal":{"name":"Journal of Cosmology and Astroparticle Physics","volume":"106 1","pages":""},"PeriodicalIF":6.4,"publicationDate":"2024-11-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142671010","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
Strong lensing as a probe of braneworld 强透镜作为支流世界的探测器
IF 6.4 2区 物理与天体物理
Journal of Cosmology and Astroparticle Physics Pub Date : 2024-11-19 DOI: 10.1088/1475-7516/2024/11/028
Yi Zhang, Hong Liu, Dan Wen and Hongsheng Zhang
{"title":"Strong lensing as a probe of braneworld","authors":"Yi Zhang, Hong Liu, Dan Wen and Hongsheng Zhang","doi":"10.1088/1475-7516/2024/11/028","DOIUrl":"https://doi.org/10.1088/1475-7516/2024/11/028","url":null,"abstract":"For the first time, we use the Event Horizon Telescope (EHT) data to constrain the parameters of braneworld black holes which constrain ϵ = 0.0285+0.0888+0.1456-0.0895-0.1475 for the anisotropic black hole and q = -0.0305+0.1034+0.1953-0.0895-0.1470 for the tidal Reissner-Nordström (RN) black hole. Based on the fitted data and physical requirement, we calculate the photon deflection, the angular separation and time delay between different relativistic images of the anisotropic black hole and the tidal RN black hole in the ranges -0.1190 < ϵ < 0 and -0.1775 < q < 0. And furthermore, we study the quasinormal modes (QNMs) for the braneworld black holes. The results shed light on existence of extra dimension.","PeriodicalId":15445,"journal":{"name":"Journal of Cosmology and Astroparticle Physics","volume":"54 1","pages":""},"PeriodicalIF":6.4,"publicationDate":"2024-11-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142671013","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
Relic gravitons and non-stationary processes 遗迹引力子和非稳态过程
IF 6.4 2区 物理与天体物理
Journal of Cosmology and Astroparticle Physics Pub Date : 2024-11-19 DOI: 10.1088/1475-7516/2024/11/027
Massimo Giovannini
{"title":"Relic gravitons and non-stationary processes","authors":"Massimo Giovannini","doi":"10.1088/1475-7516/2024/11/027","DOIUrl":"https://doi.org/10.1088/1475-7516/2024/11/027","url":null,"abstract":"Stationary processes do not accurately describe the diffuse backgrounds of relic gravitons whose correlations are homogeneous in space (i.e. only dependent upon the distance between the two spatial locations) but not in time. The symmetries of the autocorrelations ultimately reflect the quantum mechanical origin of the diffuse backgrounds and lead to non-stationary observables at late time. In particular, large oscillations are believed to arise in the spectral energy density that is customarily (but approximately) related to the tensor power spectrum. When the full expression of the spectral energy density is employed the amplitudes of oscillation are instead suppressed in the large-scale limit and the non-stationary features of the late-time signal practically disappear. For similar reasons the relations between the spectral energy density and the spectral amplitude are ambiguous in the presence of non-stationary features. While it is debatable if the non-stationary features are (or will be) directly detectable, we argue that the spectral amplitude following from the Wiener-Khintchine theorem is generally inappropriate for a consistent description of the relic signal. Nevertheless the strong oscillatory behaviour of the late-time observables is naturally smeared out provided the spectral energy density is selected as pivotal variable.","PeriodicalId":15445,"journal":{"name":"Journal of Cosmology and Astroparticle Physics","volume":"18 1","pages":""},"PeriodicalIF":6.4,"publicationDate":"2024-11-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142671018","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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