Classical and Quantum Gravity最新文献

Extended datasamples under the lens of Brane World Theory 膜世界理论下的扩展数据样本

IF 3.5 3区物理与天体物理

Classical and Quantum Gravity Pub Date : 2025-05-28 DOI: 10.1088/1361-6382/adda89

Kyra Jacobo and Dorian Araya

{"title":"Extended datasamples under the lens of Brane World Theory","authors":"Kyra Jacobo and Dorian Araya","doi":"10.1088/1361-6382/adda89","DOIUrl":"https://doi.org/10.1088/1361-6382/adda89","url":null,"abstract":"This work revises the Brane World Theory known as Randall Sundrum with the modification of an exponential, redshift-dependent brane tension. This model is studied in a scenario assuming no dark energy, with the aim of determining whether it can reproduce the Universe’s acceleration on its own, without the addition of a dark energy fluid. Bayesian Statistical analysis is performed in order to constrain the free parameters of each scenario for which the datasamples of SLS, SNIa, OHD and BAO are used, the last two considering newly added elements on the data. Both Planck and Riess priors for h are used and compared. In both cases we are able to reproduce the late-time accelerated expansion in agreement with observational data. Interesting consistencies at transition redshift zt with ΛCDM are found suggesting that this might be a suitable model for studying the evolution of the Universe up to present date, however, some pathologies are detected in this model, namely a ‘Big Rip’ divergence of H(z) at z = 1, as well as a strong relationship between the form of the functional for the brane tension and the future evolution of the Universe in this model.","PeriodicalId":10282,"journal":{"name":"Classical and Quantum Gravity","volume":"1 1","pages":"115014"},"PeriodicalIF":3.5,"publicationDate":"2025-05-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144165232","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

A dynamic theory of entanglement for uniformly accelerated atoms 匀加速原子纠缠的动力学理论

IF 3.5 3区物理与天体物理

Classical and Quantum Gravity Pub Date : 2025-05-28 DOI: 10.1088/1361-6382/adda8b

M S Soares, G Menezes and N F Svaiter

引用次数: 0

Brill waves with slow fall-off towards spatial infinity 向无限空间缓慢衰减的布里尔波

IF 3.5 3区物理与天体物理

Classical and Quantum Gravity Pub Date : 2025-05-26 DOI: 10.1088/1361-6382/add5b7

Lydia Bieri, David Garfinkle and James Wheeler

引用次数: 0

Possibility analysis of a flat cuboid Au–Pt alloy test mass employed in space gravitational wave detection 扁长方体Au-Pt合金试验质量用于空间引力波探测的可能性分析

IF 3.5 3区物理与天体物理

Classical and Quantum Gravity Pub Date : 2025-05-26 DOI: 10.1088/1361-6382/add837

Zi-He Huang, Yan-Chong Liu and Ze-Bing Zhou

{"title":"Possibility analysis of a flat cuboid Au–Pt alloy test mass employed in space gravitational wave detection","authors":"Zi-He Huang, Yan-Chong Liu and Ze-Bing Zhou","doi":"10.1088/1361-6382/add837","DOIUrl":"https://doi.org/10.1088/1361-6382/add837","url":null,"abstract":"Space-based gravitational wave detection generally employs kilogram-scale cubic test masses. The flat cuboid test mass for gravity satellites has the advantages of lightweight, low remanent magnetic moment, low preload force requirement and convenient ground testing. The paper analyses the relationship between acceleration noise and dimensions, identifying that the flat cuboid Au–Pt alloy test mass is promising for space-based gravitational wave detection. The scheme proposed in the paper adopts a new electrostatic control strategy, avoiding the noise of rotating electrostatic control in a sensitive direction. Based on this scheme, theoretical analysis shows that the flat cuboid Au–Pt alloy test mass can achieve a performance of about between to , limited by Brownian noise, random charging noise and magnetic noise. Finally, the paper presents the performance of test masses in different dimensions, finding that increasing the side length along the sensitive direction is the most efficient optimisation for performance in the low frequency range. The flat cuboid Au–Pt test mass represents a potential inertial sensor scheme for space-based gravitational wave detection.","PeriodicalId":10282,"journal":{"name":"Classical and Quantum Gravity","volume":"18 1","pages":"115010"},"PeriodicalIF":3.5,"publicationDate":"2025-05-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144145497","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

Substoichiometric silica in a multimaterial highly reflective coating 多材料高反射涂层中的亚化学计量二氧化硅

IF 3.5 3区物理与天体物理

Classical and Quantum Gravity Pub Date : 2025-05-26 DOI: 10.1088/1361-6382/add2c6

Nicholas Demos, Slawomir Gras, Matthew Evans, Peter O’Brien, Garilynn Billingsley and Liyuan Zhang

引用次数: 0

On the singularities of the exponential function of a semidirect product 半直积的指数函数的奇异性

IF 3.5 3区物理与天体物理

Classical and Quantum Gravity Pub Date : 2025-05-26 DOI: 10.1088/1361-6382/add786

Alexandru Chirvasitu, Rafael Dahmen, Karl–Hermann Neeb and Alexander Schmeding

引用次数: 0

Supermassive binary black holes and current status of their multimessenger observations 超大质量双黑洞及其多信使观测的现状

IF 3.5 3区物理与天体物理

Classical and Quantum Gravity Pub Date : 2025-05-22 DOI: 10.1088/1361-6382/adc4b0

Youjun Lu

引用次数: 0

On the symmetry of Special Quantum Relativity 论狭义量子相对论的对称性

IF 3.5 3区物理与天体物理

Classical and Quantum Gravity Pub Date : 2025-05-22 DOI: 10.1088/1361-6382/add838

Otto C W Kong

{"title":"On the symmetry of Special Quantum Relativity","authors":"Otto C W Kong","doi":"10.1088/1361-6382/add838","DOIUrl":"https://doi.org/10.1088/1361-6382/add838","url":null,"abstract":"Quantum reference frame as in the example of observing a quantum particle from another has been a topic of much recent interest. Quantum spatial translations, quantum rotations, and quantum Lorentz boosts in the sense have been studied to some extent. The article aims at using a consistent formulation of all that to give a full picture of what would be the symmetry of Special Quantum Relativity as special relativity as seen from quantum particles. We first look at a direct formulation of the mathematical quantum analog of any classical one-parameter Lie group of such transformations suggested by our Heisenberg picture thinking of quantum mechanics. A quantum rotation and a quantum Lorentz boost are presented. Analysis of the compositions of two such transformations shows unnatural results with various problems, especially with their commutators. From a physical point of view, we argue for a modified formulation. A quantum reference frame transformation, as the description of firstly the spacetime position of an object, idealized as a particle, as seen from another has to involve a full set of four-coordinate quantum quantities instead of one in a single coordinate only. Unlike the classical case, we illustrate that the analog of a change by the zero classical coordinate values has nontrivial effects in the transformation. A consistent full picture of the symmetry is then obtained. Results that could be interpreted essentially as the quantum analogs of the translation of a single coordinate observable, including angular ones for a rotation or a boost, can be retrieved from that but only as approximations. Under the traditional perspective of relativity symmetry being about spacetime reference frames, our task is then completed. We further look at the quantum version of Heisenberg–Weyl symmetry and perspectives on its relation with the subject matter and argue for the necessity of our background noncommutative geometric perspective for a conceptual consistent story.","PeriodicalId":10282,"journal":{"name":"Classical and Quantum Gravity","volume":"138 1","pages":""},"PeriodicalIF":3.5,"publicationDate":"2025-05-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144130135","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

The first law and weak cosmic censorship for de Sitter black holes 德西特黑洞的第一定律和弱宇宙审查

IF 3.5 3区物理与天体物理

Classical and Quantum Gravity Pub Date : 2025-05-22 DOI: 10.1088/1361-6382/add787

Daisuke Yoshida and Kaho Yoshimura

引用次数: 0

Accelerating numerical relativity with code generation: CUDA-enabled hyperbolic relaxation 用代码生成加速数值相对论：cuda支持的双曲松弛

IF 3.5 3区物理与天体物理

Classical and Quantum Gravity Pub Date : 2025-05-21 DOI: 10.1088/1361-6382/add63e

Samuel D Tootle, Leonardo R Werneck, Thiago Assumpção, Terrence Pierre Jacques and Zachariah B Etienne

{"title":"Accelerating numerical relativity with code generation: CUDA-enabled hyperbolic relaxation","authors":"Samuel D Tootle, Leonardo R Werneck, Thiago Assumpção, Terrence Pierre Jacques and Zachariah B Etienne","doi":"10.1088/1361-6382/add63e","DOIUrl":"https://doi.org/10.1088/1361-6382/add63e","url":null,"abstract":"Next-generation gravitational wave (GW) detectors such as Cosmic Explorer, the Einstein Telescope, and LISA, demand highly accurate and extensive GW catalogs to faithfully extract physical parameters from observed signals. However, numerical relativity (NR) faces significant challenges in generating these catalogs at the required scale and accuracy on modern computers, as NR codes do not fully exploit modern GPU capabilities. In response, we extend NRPy, a Python-based NR code-generation framework, to develop NRPyEllipticGPU—a CUDA-optimized elliptic solver tailored for the binary black hole initial data problem. NRPyEllipticGPU is the first GPU-enabled elliptic solver in the NR community, supporting a variety of coordinate systems and demonstrating substantial performance improvements on both consumer-grade and HPC-grade GPUs. We show that, when compared to a high-end CPU, NRPyEllipticGPU achieves on a high-end GPU up to a sixteenfold speedup in single precision while increasing double-precision performance by a factor of 2–4. This performance boost leverages the GPU’s superior parallelism and memory bandwidth to achieve a compute-bound application and enhancing the overall simulation efficiency. As NRPyEllipticGPU shares the core infrastructure common to NR codes, this work serves as a practical guide for developing full, CUDA-optimized NR codes.","PeriodicalId":10282,"journal":{"name":"Classical and Quantum Gravity","volume":"4 1","pages":""},"PeriodicalIF":3.5,"publicationDate":"2025-05-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144113981","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