Classical and Quantum Gravity最新文献_第6页

Electrodynamics in curved spacetime: gravitationally-induced constitutive equations and the spacetime index of refraction 弯曲时空中的电动力学：引力诱导的本构方程和时空折射率

IF 3.5 3区物理与天体物理

Classical and Quantum Gravity Pub Date : 2025-06-11 DOI: 10.1088/1361-6382/addcb1

F Masghatian, M Esfandiar and M Nouri-Zonoz

引用次数: 0

Killing and homothetic initial data for general hypersurfaces 一般超曲面的杀戮与齐次初始数据

IF 3.5 3区物理与天体物理

Classical and Quantum Gravity Pub Date : 2025-06-10 DOI: 10.1088/1361-6382/addea3

Marc Mars and Gabriel Sánchez-Pérez

{"title":"Killing and homothetic initial data for general hypersurfaces","authors":"Marc Mars and Gabriel Sánchez-Pérez","doi":"10.1088/1361-6382/addea3","DOIUrl":"https://doi.org/10.1088/1361-6382/addea3","url":null,"abstract":"In this paper we present a collection of general identities relating the deformation tensor of an arbitrary vector field η with the tensor on an abstract hypersurface of any causal character. As an application we establish necessary conditions on for the existence of a homothetic Killing vector on the spacetime where is embedded. The sufficiency of these conditions is then analysed in three specific settings. For spacelike hypersurfaces, we recover the well-known homothetic KID equations in the language of hypersurface data. For two intersecting null hypersurfaces, we generalize a previous result by Chruściel and Paetz, valid for Killings, to the homothetic case and, moreover, demonstrate that the equations can be formulated solely in terms of the initial data for the characteristic Cauchy problem, i.e. without involving a priori spacetime quantities. This puts the characteristic KID problem on equal footing with the spacelike KID problem. Furthermore, we highlight the versatility of the formalism by addressing the homothetic KID problem for smooth spacelike-characteristic initial data. Other initial value problems, such as the spacelike-characteristic with corners, can be approached similarly.","PeriodicalId":10282,"journal":{"name":"Classical and Quantum Gravity","volume":"36 1","pages":""},"PeriodicalIF":3.5,"publicationDate":"2025-06-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144260536","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

Ultra-massive spacetimes in 2 + 1 ... 2 + 1中的超大质量时空…

IF 3.5 3区物理与天体物理

Classical and Quantum Gravity Pub Date : 2025-06-05 DOI: 10.1088/1361-6382/addc2e

Ingemar Bengtsson and José M M Senovilla

引用次数: 0

Achieving non-orbital particle trapping in binary black holes through dynamic stability 通过动态稳定性实现双黑洞非轨道粒子捕获

IF 3.5 3区物理与天体物理

Classical and Quantum Gravity Pub Date : 2025-06-04 DOI: 10.1088/1361-6382/addc2f

A Kurmus, M Zajaček, G Kestin and L Deslauriers

{"title":"Achieving non-orbital particle trapping in binary black holes through dynamic stability","authors":"A Kurmus, M Zajaček, G Kestin and L Deslauriers","doi":"10.1088/1361-6382/addc2f","DOIUrl":"https://doi.org/10.1088/1361-6382/addc2f","url":null,"abstract":"We present an interdisciplinary comparison between binary black hole systems and radio frequency Paul Traps, modeling the gravitational binary system as a rotating saddle near its center. This analogy connects these seemingly unrelated systems through the concept of dynamic stability. The rotating saddle potential is analytically tractable, allowing us to prove the existence of bounded charged particle trajectories under certain conditions. By focusing on stellar-mass black holes with a weak electric charge-a feature consistent with specific astrophysical conditions that leaves the spacetime metric largely unaffected but can influence nearby particle interactions-we can neglect complicating factors such as magnetic fields from large accretion disks of heavier black holes or stellar winds. Our simulation results demonstrate that charged particles can exhibit stable, non-orbital trajectories near the center of a binary system with charged stellar-mass black holes, providing unique three-dimensional trapping primarily through gravity. This system is distinctive in the literature for its non-orbital trapping mechanism. While theoretically intriguing, this trapping relies on specific conditions, including nearly identical black hole masses. These types of non-orbital trapping mechanisms could potentially allow for longer-lived plasma configurations, enhancing our ability to detect electromagnetic signatures from these systems. The significance of this work lies in the novel comparison between a laboratory-scale quantum system and a larger astrophysical one, opening new avenues for exploring parallels between microscopic and cosmic phenomena across fourteen orders of magnitude in distance.","PeriodicalId":10282,"journal":{"name":"Classical and Quantum Gravity","volume":"11 1","pages":"115017"},"PeriodicalIF":3.5,"publicationDate":"2025-06-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144218685","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

Length dependence of waveform mismatch: a caveat on waveform accuracy 波形失配的长度依赖性：对波形精度的警告

IF 3.5 3区物理与天体物理

Classical and Quantum Gravity Pub Date : 2025-06-03 DOI: 10.1088/1361-6382/add8d9

Keefe Mitman, Leo C Stein, Michael Boyle, Nils Deppe, Lawrence E Kidder, Harald P Pfeiffer and Mark A Scheel

引用次数: 0

Coronagraphic time-delay interferometry: characterization and updated geometric properties 日冕延时干涉术：表征和更新的几何特性

IF 3.5 3区物理与天体物理

Classical and Quantum Gravity Pub Date : 2025-06-03 DOI: 10.1088/1361-6382/addbbd

Raissa Costa Barroso, Yves Lemière, François Mauger and Quentin Baghi

{"title":"Coronagraphic time-delay interferometry: characterization and updated geometric properties","authors":"Raissa Costa Barroso, Yves Lemière, François Mauger and Quentin Baghi","doi":"10.1088/1361-6382/addbbd","DOIUrl":"https://doi.org/10.1088/1361-6382/addbbd","url":null,"abstract":"The Laser Interferometer Space Antenna (LISA) will be a space-borne gravitational wave (GW) detector to be launched in the next decade. Central to LISA data analysis is time-delay interferometry (TDI), a numerical procedure which drastically reduces otherwise overwhelming laser frequency noise. LISA data analysis is usually performed on sets of TDI variables, e.g. Michelson variables or quasiorthogonal variables . We investigate a less standard TDI variable denoted κ which depends on time, or frequency, and two parameters . This so-called coronagraphic TDI variable has the singular property of canceling GW signal when tend to the sky position of the GW source. Note that, as a consequence of LISA’s planar symmetry, GW signal is also canceled when tend to . Nonetheless, thanks to this property, coronagraphic TDI has the potential to be an efficient model-agnostic method for sky localization of GW sources with LISA. These characteristics make it relevant for low-latency searches and a possible glitch veto. Although briefly discussed in the literature, coronagraphic TDI has only been tested on theoretical grounds. In this paper we validate the applicability of κ to sky localization of typical LISA sources, namely Galactic binaries and massive black hole binaries, when considering a simplified LISA instrument. The goal of this paper is to pave the way for applications of coronagraphic TDI to practical LISA data analysis problems.","PeriodicalId":10282,"journal":{"name":"Classical and Quantum Gravity","volume":"247 1","pages":""},"PeriodicalIF":3.5,"publicationDate":"2025-06-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144211347","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

First characterisation of the MAGO cavity, a superconducting RF detector for kHz–MHz gravitational waves 第一个表征MAGO腔，一个超导射频探测器用于kHz-MHz引力波

IF 3.5 3区物理与天体物理

Classical and Quantum Gravity Pub Date : 2025-05-29 DOI: 10.1088/1361-6382/add8da

Lars Fischer, Bianca Giaccone, Ivan Gonin, Anna Grassellino, Wolfgang Hillert, Timergali Khabiboulline, Tom Krokotsch, Gudrid Moortgat-Pick, Andrea Muhs, Yuriy Orlov, Michel Paulsen, Krisztian Peters, Sam Posen, Oleg Pronitchev and Marc Wenskat

{"title":"First characterisation of the MAGO cavity, a superconducting RF detector for kHz–MHz gravitational waves","authors":"Lars Fischer, Bianca Giaccone, Ivan Gonin, Anna Grassellino, Wolfgang Hillert, Timergali Khabiboulline, Tom Krokotsch, Gudrid Moortgat-Pick, Andrea Muhs, Yuriy Orlov, Michel Paulsen, Krisztian Peters, Sam Posen, Oleg Pronitchev and Marc Wenskat","doi":"10.1088/1361-6382/add8da","DOIUrl":"https://doi.org/10.1088/1361-6382/add8da","url":null,"abstract":"Heterodyne detection using microwave cavities is a promising method for detecting high-frequency gravitational waves (GWs) or ultralight axion dark matter. In this work, we report on studies conducted on a spherical 2-cell cavity developed by the MAGO collaboration for high-frequency GWs detection. Although fabricated around 20 years ago, the cavity had not been used since. Due to deviations from the nominal geometry, we conducted a mechanical survey and performed room-temperature plastic tuning. Measurements and simulations of the mechanical resonances and electromagnetic properties were carried out, as these are critical for estimating the cavity’s GW coupling potential. Based on these results, we plan further studies in a cryogenic environment. The cavity characterisation does not only provide valuable experience for a planned physics run but also informs the future development of improved cavity designs.","PeriodicalId":10282,"journal":{"name":"Classical and Quantum Gravity","volume":"146 1","pages":""},"PeriodicalIF":3.5,"publicationDate":"2025-05-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144177036","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

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