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Classical and Quantum Gravity最新文献

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Schouten–Codazzi gravity 舒腾-科达齐重力
IF 3.5 3区 物理与天体物理
Classical and Quantum Gravity Pub Date : 2024-11-27 DOI: 10.1088/1361-6382/ad922e
Roberto A Sussman and Sebastián Nájera
{"title":"Schouten–Codazzi gravity","authors":"Roberto A Sussman and Sebastián Nájera","doi":"10.1088/1361-6382/ad922e","DOIUrl":"https://doi.org/10.1088/1361-6382/ad922e","url":null,"abstract":"We propose a new phenomenological second order gravity theory to be denoted as ‘Schouten–Codazzi’ Gravity’ (SCG), as it is based on Schouten and Codazzi tensors. The theory is related, but is clearly distinct from Cotton gravity. By assuming as source the energy momentum of General Relativity, we form a second order system with its geometric sector given by the sum of the Schouten tensor and a generic second order symmetric tensor complying with the following properties: (i) it must satisfy the Codazzi differential condition and (ii) it must be concomitant with the invariant characterization based on the algebraic structure of curvature tensors for specific spacetimes or classes of spacetimes. We derive and briefly discuss the properties of SCG solutions for static spherical symmetry (vacuum and perfect fluid), FLRW models and spherical dust fluids. While we do recognize that SCG is ‘work in progress’ in an incipient stage that still requires significant theoretical development, we believe that the theory provides valuable guidelines in the search for alternatives to General Relativity.","PeriodicalId":10282,"journal":{"name":"Classical and Quantum Gravity","volume":"16 1","pages":""},"PeriodicalIF":3.5,"publicationDate":"2024-11-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142718428","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
Stabilizing effect of the spacetime expansion on the Euler–Poisson equations in Newtonian cosmology 时空膨胀对牛顿宇宙学中欧拉-泊松方程的稳定效应
IF 3.5 3区 物理与天体物理
Classical and Quantum Gravity Pub Date : 2024-11-25 DOI: 10.1088/1361-6382/ad9132
Xinyu Gong and Changhua Wei
{"title":"Stabilizing effect of the spacetime expansion on the Euler–Poisson equations in Newtonian cosmology","authors":"Xinyu Gong and Changhua Wei","doi":"10.1088/1361-6382/ad9132","DOIUrl":"https://doi.org/10.1088/1361-6382/ad9132","url":null,"abstract":"The validity of the cosmic no-hair theorem for polytropic perfect fluids has been established by (Brauer et al 1994 Class. Quantum Grav. 11 2283) within the context of Newtonian cosmology, specifically under conditions of exponential expansion. This paper extends the investigation to assess the nonlinear stability of homogeneous Newtonian cosmological models under general accelerated expansion for perfect fluids. With appropriate assumptions regarding the expansion rate and decay properties of the homogeneous solution, our results demonstrate that the Euler–Poisson system admits a globally classical solution for initial data that are small perturbations to the homogeneous solution. Additionally, we establish that the solution asymptotically approaches the homogeneous solution as time tends to infinity. The theoretical framework is then applied to various types of perfect fluids, including isothermal gases, Chaplygin gases, and polytropic gases.","PeriodicalId":10282,"journal":{"name":"Classical and Quantum Gravity","volume":"66 1","pages":""},"PeriodicalIF":3.5,"publicationDate":"2024-11-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142697061","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
Symmetric vs. chiral approaches to massive fields with spin 自旋大质量场的对称与手性方法
IF 3.5 3区 物理与天体物理
Classical and Quantum Gravity Pub Date : 2024-11-25 DOI: 10.1088/1361-6382/ad8f27
William Delplanque and Evgeny Skvortsov
{"title":"Symmetric vs. chiral approaches to massive fields with spin","authors":"William Delplanque and Evgeny Skvortsov","doi":"10.1088/1361-6382/ad8f27","DOIUrl":"https://doi.org/10.1088/1361-6382/ad8f27","url":null,"abstract":"Massive higher spin fields are notoriously difficult to introduce interactions when they are described by symmetric (spin)-tensors. An alternative approach is to use chiral description that does not have unphysical longitudinal modes. For low spin fields we show that chiral and symmetric approaches can be related via a family of invertible change of variables (equivalent to parent actions), which should facilitate introduction of consistent interactions in the symmetric approach and help to control parity in the chiral one. We consider some examples of electromagnetic and gravitational interactions and their transmutations when going to the chiral formulation. An interesting feature of the relation is how second class constraints get eliminated while preserving Lorentz invariance.","PeriodicalId":10282,"journal":{"name":"Classical and Quantum Gravity","volume":"71 1","pages":""},"PeriodicalIF":3.5,"publicationDate":"2024-11-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142697134","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 Penrose limit of the Weyl double copy 韦尔双副本的彭罗斯极限
IF 3.5 3区 物理与天体物理
Classical and Quantum Gravity Pub Date : 2024-11-21 DOI: 10.1088/1361-6382/ad8f8c
Samarth Chawla, Kwinten Fransen and Cynthia Keeler
{"title":"The Penrose limit of the Weyl double copy","authors":"Samarth Chawla, Kwinten Fransen and Cynthia Keeler","doi":"10.1088/1361-6382/ad8f8c","DOIUrl":"https://doi.org/10.1088/1361-6382/ad8f8c","url":null,"abstract":"We embed the Penrose limit into the Weyl classical double copy. Thereby, we provide a lift of the double copy properties of plane wave spacetimes into black hole geometries and we open a novel avenue towards taking the classical double copy beyond statements about algebraically special backgrounds. In particular, the Penrose limit, viewed as the leading order Fermi coordinate expansion around a null geodesic, complements approaches leveraging asymptotic flatness such as the asymptotic Weyl double copy. Along the way, we show how our embedding of the Penrose limit within the Weyl double copy naturally fixes the functional ambiguity in the double copy for Petrov type N spacetimes. We also highlight the utility of a spinorial approach to the Penrose limit. In particular, we use this spinorial approach to derive a simple analytical expression for arbitrary Penrose limits of four-dimensional, vacuum type D spacetimes.","PeriodicalId":10282,"journal":{"name":"Classical and Quantum Gravity","volume":"71 1","pages":""},"PeriodicalIF":3.5,"publicationDate":"2024-11-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142678311","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
Identifying noise transients in gravitational-wave data arising from nonlinear couplings 识别引力波数据中由非线性耦合引起的瞬时噪声
IF 3.5 3区 物理与天体物理
Classical and Quantum Gravity Pub Date : 2024-11-21 DOI: 10.1088/1361-6382/ad7cb7
Bernard Hall, Sudhagar Suyamprakasam, Nairwita Mazumder, Anupreeta More and Sukanta Bose
{"title":"Identifying noise transients in gravitational-wave data arising from nonlinear couplings","authors":"Bernard Hall, Sudhagar Suyamprakasam, Nairwita Mazumder, Anupreeta More and Sukanta Bose","doi":"10.1088/1361-6382/ad7cb7","DOIUrl":"https://doi.org/10.1088/1361-6382/ad7cb7","url":null,"abstract":"Noise in various interferometer systems can sometimes couple non-linearly to create excess noise in the gravitational wave (GW) strain data. Third-order statistics, such as bicoherence and biphase, can identify these couplings and help discriminate those occurrences from astrophysical GW signals. However, the conventional analysis can yield large bicoherence values even when no phase-coupling is present, thereby, resulting in false identifications. Introducing artificial phase randomization in computing the bicoherence reduces such occurrences with negligible impact on its effectiveness for detecting true phase-coupled disturbances. We demonstrate this property with simulated disturbances—focusing only on short-duration ones (lasting up to a few seconds) and employing mainly the auto-bicoherence in this work. Statistical hypothesis testing is used for distinguishing phase-coupled disturbances from non-phase coupled ones when employing the phase-randomized bicoherence. We also obtain an expression for the bicoherence value that minimizes the sum of the probabilities of false positives and false negatives. This can be chosen as a threshold for shortlisting bicoherence triggers for further scrutiny for the presence of non-linear coupling. Finally, the utility of the phase-randomized bicoherence analysis in GW time-series data is demonstrated for the following three scenarios: (1) Finding third-order statistical similarities within categories of noise transients, such as blips and koi fish. If these non-Gaussian noise transients, or glitches, have a common source, their bicoherence maps can have similarities arising from common bifrequencies related to that source. (2) Differentiating linear or non-linear phase-coupled glitches from compact binary coalescence signals through their bicoherence maps. This is explained with a simulated signal. (3) Identifying repeated bifrequencies in the second and third observation runs (i.e. O2 and O3) of LIGO and Virgo.","PeriodicalId":10282,"journal":{"name":"Classical and Quantum Gravity","volume":"197 1","pages":""},"PeriodicalIF":3.5,"publicationDate":"2024-11-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142678310","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
Correlations and signaling in the Schrödinger–Newton model 薛定谔-牛顿模型中的相关性和信号传递
IF 3.5 3区 物理与天体物理
Classical and Quantum Gravity Pub Date : 2024-11-20 DOI: 10.1088/1361-6382/ad8f8a
Jacek Aleksander Gruca, Ankit Kumar, Ray Ganardi, Paramasivan Arumugam, Karolina Kropielnicka and Tomasz Paterek
{"title":"Correlations and signaling in the Schrödinger–Newton model","authors":"Jacek Aleksander Gruca, Ankit Kumar, Ray Ganardi, Paramasivan Arumugam, Karolina Kropielnicka and Tomasz Paterek","doi":"10.1088/1361-6382/ad8f8a","DOIUrl":"https://doi.org/10.1088/1361-6382/ad8f8a","url":null,"abstract":"The Schrödinger–Newton (SN) model is a semi-classical theory in which, in addition to mutual attraction, massive quantum particles interact with their own gravitational fields. While there are many studies on the phenomenology of single particles, correlation dynamics in multipartite systems is largely unexplored. Here, we show that the SN interactions preserve the product form of the initial state of a many-body system, yet on average agreeing with classical mechanics of continuous mass distributions. This leads to a simple test of the model, based on verifying bipartite gravitational evolution towards non-product states. We show using standard quantum mechanics that, with currently accessible single-particle parameters, two masses released from harmonic traps get correlated well before any observable entanglement is accumulated. Therefore, the SN model can be tested with setups aimed at observation of gravitational entanglement with significantly relaxed requirements on coherence time. We also present a mixed-state extension of the model that avoids superluminal signaling.","PeriodicalId":10282,"journal":{"name":"Classical and Quantum Gravity","volume":"80 1","pages":""},"PeriodicalIF":3.5,"publicationDate":"2024-11-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142673448","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
Existence and absence of Killing horizons in static solutions with symmetries 具有对称性的静态解中基林地平线的存在与不存在
IF 3.5 3区 物理与天体物理
Classical and Quantum Gravity Pub Date : 2024-11-19 DOI: 10.1088/1361-6382/ad8ea4
Hideki Maeda and Cristián Martínez
{"title":"Existence and absence of Killing horizons in static solutions with symmetries","authors":"Hideki Maeda and Cristián Martínez","doi":"10.1088/1361-6382/ad8ea4","DOIUrl":"https://doi.org/10.1088/1361-6382/ad8ea4","url":null,"abstract":"Without specifying a matter field nor imposing energy conditions, we study Killing horizons in -dimensional static solutions in general relativity with an -dimensional Einstein base manifold. Assuming linear relations and near a Killing horizon between the energy density ρ, radial pressure , and tangential pressure p2 of the matter field, we prove that any non-vacuum solution satisfying ( ) or does not admit a horizon as it becomes a curvature singularity. For and , non-vacuum solutions admit Killing horizons, on which there exists a matter field only for and , which are of the Hawking–Ellis type I and type II, respectively. Differentiability of the metric on the horizon depends on the value of , and non-analytic extensions beyond the horizon are allowed for . In particular, solutions can be attached to the Schwarzschild–Tangherlini-type vacuum solution at the Killing horizon in at least a regular manner without a lightlike thin shell. We generalize some of those results in Lovelock gravity with a maximally symmetric base manifold.","PeriodicalId":10282,"journal":{"name":"Classical and Quantum Gravity","volume":"54 1","pages":""},"PeriodicalIF":3.5,"publicationDate":"2024-11-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142670908","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 rapid multi-modal parameter estimation technique for LISA 用于 LISA 的快速多模式参数估计技术
IF 3.5 3区 物理与天体物理
Classical and Quantum Gravity Pub Date : 2024-11-19 DOI: 10.1088/1361-6382/ad8f26
Charlie Hoy, Connor R Weaving, Laura K Nuttall and Ian Harry
{"title":"A rapid multi-modal parameter estimation technique for LISA","authors":"Charlie Hoy, Connor R Weaving, Laura K Nuttall and Ian Harry","doi":"10.1088/1361-6382/ad8f26","DOIUrl":"https://doi.org/10.1088/1361-6382/ad8f26","url":null,"abstract":"The laser interferometer space antenna (LISA) will observe gravitational-wave (GW) signals from a wide range of sources, including massive black hole binaries (MBHBs). Although numerous techniques have been developed to perform Bayesian inference for LISA, they are often computationally expensive; analyses often take at least ∼1 month on a single CPU, even when using accelerated techniques. Not only does this make it difficult to concurrently analyse more than one GW signal, it also makes it challenging to rapidly produce parameter estimates for possible electromagnetic follow-up campaigns. simple-pe was recently developed to produce rapid parameter estimates for GW signals observed with ground-based GW detectors. In this work, we extend simple-pe to produce rapid parameter estimates for LISA sources, including the effects of higher order multipole moments. We show that simple-pe infers the source properties of massive black hole binaries in zero-noise at least faster than existing techniques; h on a single CPU. We further demonstrate that simple-pe can be applied before existing Bayesian techniques to mitigate biases in multi-modal parameter estimation analyses of MBHBs.","PeriodicalId":10282,"journal":{"name":"Classical and Quantum Gravity","volume":"173 1","pages":""},"PeriodicalIF":3.5,"publicationDate":"2024-11-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142670907","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
Strong-lensing cosmography using third-generation gravitational-wave detectors 利用第三代引力波探测器进行强透镜宇宙学研究
IF 3.5 3区 物理与天体物理
Classical and Quantum Gravity Pub Date : 2024-11-18 DOI: 10.1088/1361-6382/ad8d2e
Souvik Jana, Shasvath J Kapadia, Tejaswi Venumadhav, Surhud More and Parameswaran Ajith
{"title":"Strong-lensing cosmography using third-generation gravitational-wave detectors","authors":"Souvik Jana, Shasvath J Kapadia, Tejaswi Venumadhav, Surhud More and Parameswaran Ajith","doi":"10.1088/1361-6382/ad8d2e","DOIUrl":"https://doi.org/10.1088/1361-6382/ad8d2e","url":null,"abstract":"We present a detailed exposition of a statistical method for estimating cosmological parameters from the observation of a large number of strongly lensed binary-black-hole (BBH) mergers observable by next (third) generation (XG) gravitational-wave (GW) detectors. This method, first presented in Jana (2023 Phys. Rev. Lett.130 261401), compares the observed number of strongly lensed GW events and their time delay distribution (between lensed images) with observed events to infer cosmological parameters. We show that the precision of the estimation of the cosmological parameters does not have a strong dependance on the assumed BBH redshift distribution model. Using the large number of unlensed mergers, XG detectors are expected to measure the BBH redshift distribution with sufficient precision for the cosmological inference. However, a biased inference of the BBH redshift distribution will bias the estimation of cosmological parameters. An incorrect model for the distribution of lens properties can also lead to a biased cosmological inference. However, Bayesian model selection can assist in selecting the right model from a set of available parametric models for the lens distribution. We also present a way to incorporate the effect of contamination in the data due to the limited efficiency of lensing identification methods, so that it will not bias the cosmological inference.","PeriodicalId":10282,"journal":{"name":"Classical and Quantum Gravity","volume":"66 1","pages":""},"PeriodicalIF":3.5,"publicationDate":"2024-11-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142670343","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
Charged Nariai black holes on the dark bubble 暗泡上的带电纳里亚黑洞
IF 3.5 3区 物理与天体物理
Classical and Quantum Gravity Pub Date : 2024-11-18 DOI: 10.1088/1361-6382/ad8f8d
Ulf Danielsson and Vincent Van Hemelryck
{"title":"Charged Nariai black holes on the dark bubble","authors":"Ulf Danielsson and Vincent Van Hemelryck","doi":"10.1088/1361-6382/ad8f8d","DOIUrl":"https://doi.org/10.1088/1361-6382/ad8f8d","url":null,"abstract":"In this paper, we realise the charged Nariai black hole on a braneworld from a nucleated bubble in AdS5, known as the dark bubble model. Geometrically, the black hole takes the form of a cylindrical spacetime pulling on the dark bubble. This is realised by a brane embedding in an AdS5 black string background. Identifying the brane with a D3-brane in string theory allows us to determine a relation between the fine structure constant and the string coupling, , which was previously obtained for a microscopic black hole. We also speculate on the consequences for the Festina Lente bound and neutrino masses.","PeriodicalId":10282,"journal":{"name":"Classical and Quantum Gravity","volume":"13 1","pages":""},"PeriodicalIF":3.5,"publicationDate":"2024-11-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142670316","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
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