Classical and Quantum Gravity最新文献_第3页

Combinatorial interpretation of the coefficients of the causal set d’Alembertian 因果集达朗伯量系数的组合解释

IF 3.5 3区物理与天体物理

Classical and Quantum Gravity Pub Date : 2025-07-13 DOI: 10.1088/1361-6382/adeb3b

Karen Yeats

引用次数: 0

Low-curvature quantum corrections from unitary evolution of de Sitter space 德西特空间酉演化的低曲率量子修正

IF 3.5 3区物理与天体物理

Classical and Quantum Gravity Pub Date : 2025-07-10 DOI: 10.1088/1361-6382/adc8f3

Steffen Gielen and Rita B Neves

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Phase transition between shock formation and stability in cosmological fluids 宇宙流体中激波形成与稳定性之间的相变

IF 3.5 3区物理与天体物理

Classical and Quantum Gravity Pub Date : 2025-07-09 DOI: 10.1088/1361-6382/ade929

David Fajman, Maciej Maliborski, Maximilian Ofner, Todd Oliynyk and Zoe Wyatt

引用次数: 0

Perturbation theory for post-Newtonian neutron stars 后牛顿中子星的微扰理论

IF 3.5 3区物理与天体物理

Classical and Quantum Gravity Pub Date : 2025-07-03 DOI: 10.1088/1361-6382/ade83f

Fabian Gittins, Nils Andersson and Shanshan Yin

{"title":"Perturbation theory for post-Newtonian neutron stars","authors":"Fabian Gittins, Nils Andersson and Shanshan Yin","doi":"10.1088/1361-6382/ade83f","DOIUrl":"https://doi.org/10.1088/1361-6382/ade83f","url":null,"abstract":"Neutron stars are compact, relativistic bodies that host several extremes of modern physics. An exciting development in recent years has been the opportunity to probe this exotic physics by observing compact-binary coalescences using sensitive gravitational-wave and electromagnetic instruments. To maximise the science inferred from these measurements, we require models that accurately represent the physics. In this study, we consider the post-Newtonian approximation to general relativity for the modelling of neutron-star dynamics, with a particular view to model dynamical tides at the late stages of binary inspiral. We develop the post-Newtonian perturbation equations for a non-rotating star and show that the perturbation problem is Hermitian and therefore derives from a fundamental Lagrangian. Establishing this Lagrangian system leads to a conserved symplectic product and canonical energy for the perturbations. We determine the orthogonality condition for the post-Newtonian oscillation modes, which in turn forms the foundation of a mode-sum representation often used for dynamical tides. Finally, we demonstrate that the perturbation formulation is unique.","PeriodicalId":10282,"journal":{"name":"Classical and Quantum Gravity","volume":"78 1","pages":"135014"},"PeriodicalIF":3.5,"publicationDate":"2025-07-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144565662","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

Limits on the existence of totally reflective exotic compact objects with current and future gravitational-wave detectors 用当前和未来的引力波探测器对完全反射的奇异致密天体存在的限制

IF 3.5 3区物理与天体物理

Classical and Quantum Gravity Pub Date : 2025-07-03 DOI: 10.1088/1361-6382/addea2

Simone Mastrogiovanni, Elisa Maggio and Adriano Frattale Mascioli

{"title":"Limits on the existence of totally reflective exotic compact objects with current and future gravitational-wave detectors","authors":"Simone Mastrogiovanni, Elisa Maggio and Adriano Frattale Mascioli","doi":"10.1088/1361-6382/addea2","DOIUrl":"https://doi.org/10.1088/1361-6382/addea2","url":null,"abstract":"Exotic compact objects (ECOs) are a theorized class of compact objects that solve the paradoxes of black holes by replacing the event horizon with a physical surface located at from the would-be horizon at . Spinning horizonless objects are prone to the ergoregion instability, which would prevent their existence if their spin is higher than a critical threshold. In this paper, we set upper limits on the existence of a population of merging ECOs from the spin distribution of the population of compact binary coalescences (CBCs) detected by the LIGO, Virgo and KAGRA collaboration. Using spin measurements from 104 compact objects, we find that if ECOs have and their surface is totally reflective, the population of CBCs cannot be composed (at 90% credible level) by more than 71% (59%) of ECOs for polar (axial) perturbations. If we restrict the ECOs to be ultracompact ( ), at 90% credible level, ECOs cannot compose more than 28% and 25% of the CBC population for polar and axial perturbations. The constraints from current data are a factor of two more precise than the ones obtained from a non-detection of a stochastic GW background due to spin loss. We also study how next generation gravitational-wave detectors, such as the Einstein Telescope, can constrain the ECO population. We find that 1 day of data taking would be enough to constrain the fraction of ECOs to be lower than 20% for .","PeriodicalId":10282,"journal":{"name":"Classical and Quantum Gravity","volume":"20 1","pages":"135016"},"PeriodicalIF":3.5,"publicationDate":"2025-07-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144565661","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

Thermodynamics of Einstein–Euler–Heisenberg black holes with thermal fluctuations and nonlinear electromagnetic fields 具有热波动和非线性电磁场的爱因斯坦-欧拉-海森堡黑洞热力学

IF 3.5 3区物理与天体物理

Classical and Quantum Gravity Pub Date : 2025-07-03 DOI: 10.1088/1361-6382/ade7ea

H Gürsel, M Mangut and E Sucu

{"title":"Thermodynamics of Einstein–Euler–Heisenberg black holes with thermal fluctuations and nonlinear electromagnetic fields","authors":"H Gürsel, M Mangut and E Sucu","doi":"10.1088/1361-6382/ade7ea","DOIUrl":"https://doi.org/10.1088/1361-6382/ade7ea","url":null,"abstract":"This work mainly focuses on the nonlinear Einstein–Euler–Heisenberg theory and its applications from various aspects. Firstly, thermodynamic variables are analytically determined via Smarr formula for a four-dimensional spherically symmetric Einstein–Euler–Heisenberg black hole by taking the Hawking–Bekenstein entropy as the basis. The results are supported by graphical illustrations for certain Euler–Heisenberg and electric charge parameters, which are in turn used for making further comments on the stability and possible critical points of the concerned black hole. The thermodynamic analyses are then repeated for two distinct cases in which entropy is subject to a logarithmic and an exponential correction, respectively. Our assessments have shown that statistical quantum fluctuations and nonlinear electrodynamic effects can alter the stability and the thermodynamic properties of black holes. Finally, the one-sided bending angle and the gravitational redshift of light are determined in the vicinity of astronomical structures obeying the nonlinear Einstein–Euler–Heisenberg model and the results obtained are applied to three electrically charged, compact stars.","PeriodicalId":10282,"journal":{"name":"Classical and Quantum Gravity","volume":"1 1","pages":"135015"},"PeriodicalIF":3.5,"publicationDate":"2025-07-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144566033","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

Effects of rotation and deformation on the orbits of a Kerr-like spacetime 旋转和变形对类克尔时空轨道的影响

IF 3.5 3区物理与天体物理

Classical and Quantum Gravity Pub Date : 2025-07-02 DOI: 10.1088/1361-6382/ade21e

Diego Solano-Alfaro and Francisco Frutos-Alfaro

引用次数: 0

Impact of eccentricity and mean anomaly in numerical relativity mergers 数值相对论合并中偏心和平均异常的影响

IF 3.5 3区物理与天体物理

Classical and Quantum Gravity Pub Date : 2025-07-02 DOI: 10.1088/1361-6382/ade35d

Peter James Nee, Aldo Gamboa, Harald P Pfeiffer, Lorenzo Pompili, Antoni Ramos-Buades, Vijay Varma, Michael Boyle, Alessandra Buonanno, Raffi Enficiaud, Lawrence E Kidder and Mark A Scheel

{"title":"Impact of eccentricity and mean anomaly in numerical relativity mergers","authors":"Peter James Nee, Aldo Gamboa, Harald P Pfeiffer, Lorenzo Pompili, Antoni Ramos-Buades, Vijay Varma, Michael Boyle, Alessandra Buonanno, Raffi Enficiaud, Lawrence E Kidder and Mark A Scheel","doi":"10.1088/1361-6382/ade35d","DOIUrl":"https://doi.org/10.1088/1361-6382/ade35d","url":null,"abstract":"Accurate modelling of black hole (BH) binaries is critical to achieve the science goals of gravitational-wave detectors. Modelling such configurations relies strongly on calibration to numerical-relativity (NR) simulations. Binaries on quasi-circular orbits have been widely explored in NR, however, coverage of the broader nine-dimensional parameter space, including orbital eccentricity, remains sparse. This article develops a new procedure to control orbital eccentricity of binary BH (BBH) simulations that enables choosing initial data parameters with precise control over eccentricity and mean anomaly of the subsequent evolution, as well as the coalescence time. We then calculate several sequences of NR simulations that nearly uniformly cover the two-dimensional eccentricity–mean anomaly space for equal mass, non-spinning BBHs. We demonstrate that, for fixed eccentricity, many quantities related to the merger dynamics of BBHs show an oscillatory dependence on mean anomaly. The amplitude of these oscillations scales nearly linearly with the eccentricity of the system. We find that for the eccentricities explored in this work, the magnitude of deviations in various quantities such as the merger amplitude and peak luminosity can approach ∼5% of their quasi-circular value. We use our findings to explain eccentric phenomena reported in other studies. We also show that methods for estimating the remnant mass employed in the effective-one-body approach exhibit similar deviations, roughly matching the amplitude of the oscillations we find in NR simulations. This work is an important step towards a complete description of eccentric BBH mergers, and demonstrates the importance of considering the entire two-dimensional parameter subspace related to eccentricity.","PeriodicalId":10282,"journal":{"name":"Classical and Quantum Gravity","volume":"5 1","pages":""},"PeriodicalIF":3.5,"publicationDate":"2025-07-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144546981","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

Time-dependent accelerated Unruh-DeWitt detector without event horizon 无视界的时变加速Unruh-DeWitt探测器

IF 3.5 3区物理与天体物理

Classical and Quantum Gravity Pub Date : 2025-07-02 DOI: 10.1088/1361-6382/add707

F Sobrero, M S Soares, T Guerreiro and N F Svaiter

{"title":"Time-dependent accelerated Unruh-DeWitt detector without event horizon","authors":"F Sobrero, M S Soares, T Guerreiro and N F Svaiter","doi":"10.1088/1361-6382/add707","DOIUrl":"https://doi.org/10.1088/1361-6382/add707","url":null,"abstract":"We investigate unitarily inequivalent representations of the algebra of operators in quantum field theory in the cases where there is a Fock representation of the commutation relations. We examine more closely the operational definition of a measurement device, discussing the Unruh-DeWitt and Glauber models of quantum detectors. The transition probability per unit of proper time of both detectors in different non-inertial frames of reference in Minkowski spacetime is evaluated. We first study detectors traveling in a stationary worldline with a constant proper acceleration, i.e. a hyperbolic motion, interacting with the field prepared in the Poincaré invariant Fock vacuum state. Next, we study the Unruh-DeWitt detector at rest in a non-uniformly accelerated frame, with a time dependent acceleration interacting with the field in the Poincaré invariant Fock vacuum state. We evaluate the positive frequency Wightman function for the non-uniformly accelerated frame in a finite time interval and find that it is similar to the two-point correlation function of a system in equilibrium with a thermal bath. Calculating the transition rate, the non-uniformly accelerated Unruh-DeWitt detector can be excited even if the scalar field is prepared in the vacuum state.","PeriodicalId":10282,"journal":{"name":"Classical and Quantum Gravity","volume":"71 1","pages":""},"PeriodicalIF":3.5,"publicationDate":"2025-07-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144546980","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

Classical-quantum scattering Classical-quantum散射

IF 3.5 3区物理与天体物理

Classical and Quantum Gravity Pub Date : 2025-07-01 DOI: 10.1088/1361-6382/ade589

Daniel Carney and Akira Matsumura

引用次数: 0