Classical and Quantum Gravity最新文献_第10页

Why the universal threshold for primordial black hole formation is universal 为什么原始黑洞形成的普遍阈值是普遍的

IF 3.5 3区物理与天体物理

Classical and Quantum Gravity Pub Date : 2025-02-13 DOI: 10.1088/1361-6382/adaffc

Alex Kehagias, Davide Perrone and Antonio Riotto

引用次数: 0

Probing cosmic chemical enrichment with next-generation gravitational-wave observatories 利用下一代引力波观测站探测宇宙化学富集情况

IF 3.5 3区物理与天体物理

Classical and Quantum Gravity Pub Date : 2025-02-12 DOI: 10.1088/1361-6382/adaf70

Maya Fishbach

{"title":"Probing cosmic chemical enrichment with next-generation gravitational-wave observatories","authors":"Maya Fishbach","doi":"10.1088/1361-6382/adaf70","DOIUrl":"https://doi.org/10.1088/1361-6382/adaf70","url":null,"abstract":"By observing binary black hole (BBH) mergers out to the edge of the Universe, next-generation (XG) ground-based gravitational-wave detectors like Cosmic Explorer and Einstein Telescope will map the BBH merger rate across all of cosmic history. This merger rate traces the formation rate of their progenitor stars convolved with a delay time distribution. Given theoretically-motivated priors on the delay time distribution, we show how XG observations can measure the BBH progenitor formation rate, probing the star formation rate (SFR) up to z > 15. However, the progenitor formation rate does not directly give a measurement of the SFR, but rather a combination of the SFR and its metallicity distribution as a function of redshift. Fortunately, the metallicity-dependence of BBH formation likely varies as a function of BBH mass and/or formation channel. We find that if different BBH subpopulations with distinct metallicity biases can be identified, comparing their rates as a function of redshift yields a simultaneous measurement of the SFR and its metallicity distribution. Given optimistic theoretical priors and one year of observation, this may provide a measurement of the SFR at its peak and a 0.2 dex (0.7 dex) measurement of the median metallicity out to z = 10 (z = 15) at 90% credibility, although the uncertainties scale with theoretical uncertainties on BBH delay times and formation efficiencies.","PeriodicalId":10282,"journal":{"name":"Classical and Quantum Gravity","volume":"40 1","pages":""},"PeriodicalIF":3.5,"publicationDate":"2025-02-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143393698","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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

Einstein–Klein–Gordon system via Cauchy-characteristic evolution: computation of memory and ringdown tail 柯西特征演化的爱因斯坦-克莱因-戈登系统：记忆计算和环落尾

IF 3.5 3区物理与天体物理

Classical and Quantum Gravity Pub Date : 2025-02-11 DOI: 10.1088/1361-6382/adaf6f

Sizheng Ma, Kyle C Nelli, Jordan Moxon, Mark A Scheel, Nils Deppe, Lawrence E Kidder, William Throwe and Nils L Vu

引用次数: 0

Revisiting the apparent horizon finding problem with multigrid methods 再论多网格法的视地平求问题

IF 3.5 3区物理与天体物理

Classical and Quantum Gravity Pub Date : 2025-02-11 DOI: 10.1088/1361-6382/ad9796

Hon-Ka Hui and Lap-Ming Lin

{"title":"Revisiting the apparent horizon finding problem with multigrid methods","authors":"Hon-Ka Hui and Lap-Ming Lin","doi":"10.1088/1361-6382/ad9796","DOIUrl":"https://doi.org/10.1088/1361-6382/ad9796","url":null,"abstract":"Apparent horizon plays an important role in numerical relativity as it provides a tool to characterize the existence and properties of black holes on three-dimensional spatial slices in 3+1 numerical spacetimes. Apparent horizon finders based on different techniques have been developed. In this paper, we revisit the apparent horizon finding problem in numerical relativity using multigrid-based algorithms. We formulate the nonlinear elliptic apparent horizon equation as a linear Poisson-type equation with a nonlinear source, and solve it using a multigrid algorithm with Gauss–Seidel line relaxation. A fourth order compact finite difference scheme in spherical coordinates is derived and employed to reduce the complexity of the line relaxation operator to a tri-diagonal matrix inversion. The multigrid-based apparent horizon finder developed in this work is capable of locating apparent horizons in generic spatial hypersurfaces without any symmetries. The finder is tested with both analytic data, such as Brill–Lindquist multiple black hole data, and numerical data, including off-centered Kerr–Schild data and dynamical inspiraling binary black hole data. The obtained results are compared with those generated by the current fastest finder AHFinderDirect (Thornburg 2003 Class. Quantum Grav.21 743), which is the default finder in the open source code Einstein Toolkit. Our finder performs comparatively in terms of accuracy, and starts to outperform AHFinderDirect at high angular resolutions ( ) in terms of speed. Our finder is also more flexible to initial guess, as opposed to the Newton’s method used in AHFinderDirect. This suggests that the multigrid algorithm provides an alternative option for studying apparent horizons, especially when high resolutions are needed.","PeriodicalId":10282,"journal":{"name":"Classical and Quantum Gravity","volume":"3 1","pages":""},"PeriodicalIF":3.5,"publicationDate":"2025-02-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143385201","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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

Plane-parallel waves as Jacobi–Lie models 平面平行波的Jacobi-Lie模型

IF 3.5 3区物理与天体物理

Classical and Quantum Gravity Pub Date : 2025-02-11 DOI: 10.1088/1361-6382/adaabb

Ivo Petr and Ladislav Hlavatý

引用次数: 0

A primer on Carroll gravity 卡罗尔重力入门

IF 3.5 3区物理与天体物理

Classical and Quantum Gravity Pub Date : 2025-02-10 DOI: 10.1088/1361-6382/adaf03

Eleanor March and James Read

引用次数: 0

Spherically symmetric and static black bounces with multiple horizons, throats, and anti-throats in four dimensions 在四维空间中具有多个视界、喉道和反喉道的球对称和静态黑色弹跳

IF 3.5 3区物理与天体物理

Classical and Quantum Gravity Pub Date : 2025-02-10 DOI: 10.1088/1361-6382/adaf01

Manuel E Rodrigues and Marcos V de S Silva

引用次数: 0

Eisenhart lift for scalar fields in the FLRW universe FLRW宇宙中标量场的艾森哈特升力

IF 3.5 3区物理与天体物理

Classical and Quantum Gravity Pub Date : 2025-02-07 DOI: 10.1088/1361-6382/ada90d

Takeshi Chiba and Tsuyoshi Houri

引用次数: 0

Relating gauge gravity to string theory through obstruction 通过阻碍将规范重力与弦理论联系起来

IF 3.5 3区物理与天体物理

Classical and Quantum Gravity Pub Date : 2025-02-07 DOI: 10.1088/1361-6382/ada966

Casey Cartwright and Alex Flournoy

{"title":"Relating gauge gravity to string theory through obstruction","authors":"Casey Cartwright and Alex Flournoy","doi":"10.1088/1361-6382/ada966","DOIUrl":"https://doi.org/10.1088/1361-6382/ada966","url":null,"abstract":"In this article we provide a more detailed account of the geometry and topology of the composite bundle formalism introduced by Tresguerres (2002 Phys. Rev. D 66 064025) to accommodate gravitation as a gauge theory. In the first half of the article we identify a global structure required by the composite construction which not only exposes how the ordinary frame and tangent bundle expected in general relativity arise but provides the link or connection between these ordinary bundles and the gauge bundles of the composite bundle construction. In the second half of the article we discuss implications of this method of constructing gravity as a fiber bundle for the global structure of spacetime. We find that the underlying manifold of the composite bundle construction is expected to admit, not only a spin structure but also a string structure. As a consequence of our work we are able to extend past work on global structures of physically reasonable spacetime manifolds. It has been shown that in four spacetime dimensions, that if an oriented, Lorentzian, four dimensional manifold is stably casual that it is parallizable, and hence admits a spin structure which allows for chiral spinors. We may now add to this that such a manifold also admits a string structure.","PeriodicalId":10282,"journal":{"name":"Classical and Quantum Gravity","volume":"26 1","pages":""},"PeriodicalIF":3.5,"publicationDate":"2025-02-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143258149","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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

Simulated alignment method for suppressing tilt-to-length coupling noise in space gravitational wave telescopes 抑制空间引力波望远镜斜长耦合噪声的模拟对准方法

IF 3.5 3区物理与天体物理

Classical and Quantum Gravity Pub Date : 2025-02-07 DOI: 10.1088/1361-6382/adadc0

Lanjun Huang, Miao Yu, Yanxiong Wu, Jiancong Li, Hongbo Li, Donglan Zou, Yinghong Liu and Lintong Lin

{"title":"Simulated alignment method for suppressing tilt-to-length coupling noise in space gravitational wave telescopes","authors":"Lanjun Huang, Miao Yu, Yanxiong Wu, Jiancong Li, Hongbo Li, Donglan Zou, Yinghong Liu and Lintong Lin","doi":"10.1088/1361-6382/adadc0","DOIUrl":"https://doi.org/10.1088/1361-6382/adadc0","url":null,"abstract":"Space gravitational wave telescopes are critical in achieving precise interstellar laser interferometry. The coupling coefficient is a key metric for evaluating the ultimate performance of a telescope. However, alignment errors during the assembly phase can degrade the wavefront quality of the telescope, intensify coupling noise, and impair overall performance. Currently, no alignment scheme specifically targets the coupling-noise coefficient of telescopes. To address this, this study proposes a sensitivity matrix model that relates misalignment to the coupling coefficient and establishes clear sampling criteria for coupling noise at the exit pupil of the telescope. The model incorporates second-order correction terms, enabling a more accurate characterisation of the relationship between misalignment and tilt-to-length coupling-noise coefficients. Based on this model, an alignment scheme was developed using the coupling coefficient as the evaluation metric. Owing to the significant differences in the magnitudes of sensitivity among different misalignments and their mutual coupling effects, the predicted alignment parameters often differ substantially from the actual values. To resolve this issue, a misalignment grouping strategy was proposed to reduce prediction errors. Additionally, an iterative algorithm and a sequential adjustment strategy for components were provided to ensure alignment effectiveness. Finally, the feasibility of the proposed method was verified using a typical space gravitational wave telescope model. Experimental results show that the method successfully aligned 500 randomly misaligned samples, with all samples satisfying the requirement of a coupling noise of less than 25 pm μrad−1 after alignment. This method provides new guidance for the alignment of space gravitational wave telescope systems.","PeriodicalId":10282,"journal":{"name":"Classical and Quantum Gravity","volume":"139 1","pages":""},"PeriodicalIF":3.5,"publicationDate":"2025-02-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143258150","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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