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Classical and Quantum Gravity最新文献

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Symmetry-reduced loop quantum gravity: plane waves, flat space and the Hamiltonian constraint 对称缩减环量子引力：平面波，平坦空间和哈密顿约束
IF 3.5 3区 物理与天体物理
Classical and Quantum Gravity Pub Date : 2025-04-10 DOI: 10.1088/1361-6382/adc5d4
F Hinterleitner
{"title":"Symmetry-reduced loop quantum gravity: plane waves, flat space and the Hamiltonian constraint","authors":"F Hinterleitner","doi":"10.1088/1361-6382/adc5d4","DOIUrl":"https://doi.org/10.1088/1361-6382/adc5d4","url":null,"abstract":"Loop quantum gravity (LQG) methods are applied to a symmetry-reduced model with homogeneity in two dimensions, derived from a Gowdy model. The conditions for the propagation of unidirectional plane gravitational waves at exactly the speed of light are set up in the form of two null Killing equations in terms of Ashtekar variables and imposed as operators on the quantum states of the system. Owing to symmetry reduction the gauge group of the system reduces formally from SU(2) to U(1). Under the assumption of equal spacing of the holonomy eigenvalues, the solutions are not normalizable in the sense of the usual inner product on U(1). Taking over the inner product from the genuine gauge group SU(2) of LQG renders the obtained states normalizable, nevertheless fluctuations of geometrical quantities remain divergent. In consequence, the solutions of the (non-commuting) Killing conditions have to be renormalized. Two kinds of renormalization are presented. The combination of the occurrence of non-commuting Killing operators and the necessity of renormalization indicates fluctuations of the propagation speed, i. e. dispersion of gravitational waves. Finally the same methods are applied to the Hamiltonian constraint with the same result concerning normalizability. After renormalization the constraint is not exactly satisfied any more, which suggests the presence of some kind of interacting matter.","PeriodicalId":10282,"journal":{"name":"Classical and Quantum Gravity","volume":"74 1","pages":""},"PeriodicalIF":3.5,"publicationDate":"2025-04-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143819734","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
Quantum circuit implementation and security analysis of IVLBC IVLBC的量子电路实现及安全性分析
IF 3.5 3区 物理与天体物理
Classical and Quantum Gravity Pub Date : 2025-04-08 DOI: 10.1088/1361-6382/adc6eb
Lang Ding, Qingbin Luo, Yi Lv, Yuanmeng Zheng, Haoyu Liao and Zhuoyan Chen
{"title":"Quantum circuit implementation and security analysis of IVLBC","authors":"Lang Ding, Qingbin Luo, Yi Lv, Yuanmeng Zheng, Haoyu Liao and Zhuoyan Chen","doi":"10.1088/1361-6382/adc6eb","DOIUrl":"https://doi.org/10.1088/1361-6382/adc6eb","url":null,"abstract":"Grover’s algorithm reduces the security level of the target cipher from n-bit to n/2-bit. To implement Grover’s algorithm, a quantum circuit capable of performing the target cipher operations must be constructed. In this paper, we propose a quantum circuit implementation scheme for the involutive lightweight block cipher (IVLBC) block cipher. We utilized the DORCIS tool to implement the quantum circuit for the S-box and applied Gaussian elimination to construct the quantum circuit for matrix multiplication. Subsequently, we evaluated the overall quantum resource consumption required for the implementation. Based on this, we performed a quantum attack on IVLBC using Grover’s algorithm, calculating the attack cost using the NCT gate library, and further analyzed its security. Finally, we conducted a comparative analysis of the classical attack complexity and quantum attack complexity of IVLBC, highlighting the potential of using quantum complexity as a standard for future security assessments.","PeriodicalId":10282,"journal":{"name":"Classical and Quantum Gravity","volume":"16 1","pages":""},"PeriodicalIF":3.5,"publicationDate":"2025-04-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143805864","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 effect of curvature on local observables in quantum field theory 量子场论中曲率对局部观测值的影响
IF 3.5 3区 物理与天体物理
Classical and Quantum Gravity Pub Date : 2025-04-08 DOI: 10.1088/1361-6382/adc534
Ahmed Shalabi, Matheus H Zambianco and T Rick Perche
{"title":"The effect of curvature on local observables in quantum field theory","authors":"Ahmed Shalabi, Matheus H Zambianco and T Rick Perche","doi":"10.1088/1361-6382/adc534","DOIUrl":"https://doi.org/10.1088/1361-6382/adc534","url":null,"abstract":"We compute the leading order corrections to the expected value of the squared field amplitude of a massless real scalar quantum field due to curvature in a localized region of spacetime. We use Riemann normal coordinates to define localized field operators in a curved spacetime that are analogous to their flat space counterparts, and the Hadamard condition to find the leading order curvature corrections to the field correlations. We then apply our results to particle detector models, quantifying the effect of spacetime curvature in localized field probes.","PeriodicalId":10282,"journal":{"name":"Classical and Quantum Gravity","volume":"59 1","pages":""},"PeriodicalIF":3.5,"publicationDate":"2025-04-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143805863","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
Static vacuum 3 + 1 black holes that cannot be put into stationary rotation 静态真空3 + 1个黑洞不能进行静止旋转
IF 3.5 3区 物理与天体物理
Classical and Quantum Gravity Pub Date : 2025-04-08 DOI: 10.1088/1361-6382/adc360
Javier Peraza and Martín Reiris
{"title":"Static vacuum 3 + 1 black holes that cannot be put into stationary rotation","authors":"Javier Peraza and Martín Reiris","doi":"10.1088/1361-6382/adc360","DOIUrl":"https://doi.org/10.1088/1361-6382/adc360","url":null,"abstract":"We prove that some of the static Myers/Korotkin–Nicolai (MKN) vacuum 3 + 1 static black holes cannot be put into stationary rotation. Namely, they cannot be deformed into axisymmetric stationary vacuum black holes with non-zero angular momentum. We also prove that this occurs in particular for those MKN solutions for which the distance along the axis between the two poles of the horizon is sufficiently small compared to the square root of its area. The MKN solutions, sometimes called periodic Schwarzschild, are physically regular, have no struts or singularite, but are asymptotically Kasner. The static rigidity presented here appears to be the first in the literature of General Relativity.","PeriodicalId":10282,"journal":{"name":"Classical and Quantum Gravity","volume":"38 1","pages":""},"PeriodicalIF":3.5,"publicationDate":"2025-04-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143805862","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
Hilbert space formalisms for group field theory 群场论的希尔伯特空间形式
IF 3.5 3区 物理与天体物理
Classical and Quantum Gravity Pub Date : 2025-04-07 DOI: 10.1088/1361-6382/adc655
Steffen Gielen
{"title":"Hilbert space formalisms for group field theory","authors":"Steffen Gielen","doi":"10.1088/1361-6382/adc655","DOIUrl":"https://doi.org/10.1088/1361-6382/adc655","url":null,"abstract":"Group field theory is a background-independent approach to quantum gravity whose starting point is the definition of a quantum field theory on an auxiliary group manifold (not interpreted as spacetime, but rather as the finite-dimensional configuration space of a single ‘atom’ of geometry). Group field theory models can be seen as an extension of matrix and tensor models by additional data, and are traditionally defined through a functional integral whose perturbative expansion generates a sum over discrete geometries. More recently, some efforts have been directed towards formulations of group field theory based on a Hilbert space and operators, in particular in applications to cosmology. This is an attempt to review some of these formulations and their main ideas, to disentangle these constructions as much as possible from applications and phenomenology, and to put them into a wider context of quantum gravity research.","PeriodicalId":10282,"journal":{"name":"Classical and Quantum Gravity","volume":"28 1","pages":""},"PeriodicalIF":3.5,"publicationDate":"2025-04-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143797743","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
Field sources for wormholes with multiple throats/anti-throats 多喉/反喉虫洞的场源
IF 3.5 3区 物理与天体物理
Classical and Quantum Gravity Pub Date : 2025-04-07 DOI: 10.1088/1361-6382/adc654
T M Crispim, Marcos V de S Silva, G Alencar, Celio R Muniz and Diego Sáez-Chillón Gómez
{"title":"Field sources for wormholes with multiple throats/anti-throats","authors":"T M Crispim, Marcos V de S Silva, G Alencar, Celio R Muniz and Diego Sáez-Chillón Gómez","doi":"10.1088/1361-6382/adc654","DOIUrl":"https://doi.org/10.1088/1361-6382/adc654","url":null,"abstract":"In this work, we investigate wormhole geometries with multiple throats and anti-throats in general relativity. The existence of these structures is identified through the analysis of minima and maxima in the area of the solution. Using embedding diagrams, we visualize the geometry and demonstrate that these objects exhibit a complex structure, distinct from standard single-throat wormholes. We further analyze the geodesic motion in such spacetimes. The solutions are derived from Einstein’s equations by coupling a phantom scalar field to nonlinear electrodynamics, and we show that distinct scalar field profiles can generate the same spacetime geometry. Additionally, we examine the energy conditions and demonstrate that, for specific parameter choices, all energy conditions can be partially satisfied in certain regions of spacetime.","PeriodicalId":10282,"journal":{"name":"Classical and Quantum Gravity","volume":"74 1","pages":""},"PeriodicalIF":3.5,"publicationDate":"2025-04-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143797702","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
Supersymmetric soft theorems 超对称软定理
IF 3.5 3区 物理与天体物理
Classical and Quantum Gravity Pub Date : 2025-04-06 DOI: 10.1088/1361-6382/adc536
Adam Tropper
{"title":"Supersymmetric soft theorems","authors":"Adam Tropper","doi":"10.1088/1361-6382/adc536","DOIUrl":"https://doi.org/10.1088/1361-6382/adc536","url":null,"abstract":"We show that in supersymmetric theories, knowing the soft theorem for a single particle in a supermultiplet allows one to immediately determine soft theorems for the remainder of the supermultiplet. While soft theorems in supersymmetric theories have a rich history, they have only been chronicled for specific examples due to the fact that they are usually derived with technical Feynman diagrammatics or amplitudes methods. By contrast, we show that one can compute soft theorems non-perturbatively for entire supermultiplets in one line of algebra. This formalism is directly applicable to the most general supersymmetric theory: one with an arbitrary matter content, number of supercharges, and spacetime dimension. We give many explicit examples illustrating the scope and dexterity of this framework.","PeriodicalId":10282,"journal":{"name":"Classical and Quantum Gravity","volume":"53 1","pages":""},"PeriodicalIF":3.5,"publicationDate":"2025-04-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143790142","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 spectral approach for quasinormal frequencies of noncommutative geometry-inspired wormholes 非交换几何启发虫洞的拟正态频率的谱方法
IF 3.5 3区 物理与天体物理
Classical and Quantum Gravity Pub Date : 2025-04-01 DOI: 10.1088/1361-6382/adc2c6
Davide Batic, Denys Dutykh and Joudy Jamal Beek
{"title":"A spectral approach for quasinormal frequencies of noncommutative geometry-inspired wormholes","authors":"Davide Batic, Denys Dutykh and Joudy Jamal Beek","doi":"10.1088/1361-6382/adc2c6","DOIUrl":"https://doi.org/10.1088/1361-6382/adc2c6","url":null,"abstract":"We present a detailed investigation of quasinormal modes (QNMs) for noncommutative geometry-inspired wormholes, focusing on scalar, electromagnetic, and vector-type gravitational perturbations. By employing the spectral method, the perturbation equations are reformulated into an eigenvalue problem over a compact domain, using Chebyshev polynomials to ensure high precision and fast numerical convergence. Our results reveal the absence of overdamped modes, with all detected QNMs exhibiting oscillatory behaviour. Additionally, for large values of the rescaled mass parameter, the QNMs of the noncommutative wormhole transition smoothly to those of the classical Schwarzschild wormhole, validating the accuracy of the spectral method. This work represents the first comprehensive exploration of QNMs in noncommutative geometry-inspired wormholes, shedding light on their stability and dynamical properties.","PeriodicalId":10282,"journal":{"name":"Classical and Quantum Gravity","volume":"48 1","pages":""},"PeriodicalIF":3.5,"publicationDate":"2025-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143766791","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
Corrigendum: Dark matter effects explanation with the torsion in the Minkowski space (2024 Class. Quantum Grav. 41 075013) 更正：暗物质效应与闵可夫斯基空间中扭转的解释（2024类）。量子重力。41 075013)
IF 3.5 3区 物理与天体物理
Classical and Quantum Gravity Pub Date : 2025-04-01 DOI: 10.1088/1361-6382/adc3e6
Petro Romanets
{"title":"Corrigendum: Dark matter effects explanation with the torsion in the Minkowski space (2024 Class. Quantum Grav. 41 075013)","authors":"Petro Romanets","doi":"10.1088/1361-6382/adc3e6","DOIUrl":"https://doi.org/10.1088/1361-6382/adc3e6","url":null,"abstract":"The corrigendum provides a list of corrections necessary for accurately understanding the mathematical background of the original paper. However, these corrections do not affect the computational aspects, analysis, or conclusions presented in the paper.","PeriodicalId":10282,"journal":{"name":"Classical and Quantum Gravity","volume":"8 1","pages":""},"PeriodicalIF":3.5,"publicationDate":"2025-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143766329","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
Observations of compact stars and fermion-boson stars with a quartic self-interaction 具有四次自相互作用的致密恒星和费米子-玻色子恒星的观测
IF 3.5 3区 物理与天体物理
Classical and Quantum Gravity Pub Date : 2025-03-31 DOI: 10.1088/1361-6382/adc361
Susana Valdez-Alvarado, Alejandro Cruz-Osorio, J M Dávila, L Arturo Ureña-López and Ricardo Becerril
{"title":"Observations of compact stars and fermion-boson stars with a quartic self-interaction","authors":"Susana Valdez-Alvarado, Alejandro Cruz-Osorio, J M Dávila, L Arturo Ureña-López and Ricardo Becerril","doi":"10.1088/1361-6382/adc361","DOIUrl":"https://doi.org/10.1088/1361-6382/adc361","url":null,"abstract":"We investigated the possibility that neutron stars could be described by a fermion-boson star with a quartic self-interaction in the boson sector. Specifically, by varying the polytropic constant K and adiabatic index Γ in the polytropic equation of state, the boson mass µ, and the self-interaction parameter Λ, we construct equilibrium configurations of these mixed-stars with total mass compatible with the mass constraints obtained from observational data of NICER, NICER/XMN-Newton, and LIGO-VIRGO collaborations. Our work confirms that the addition of a boson sector eases the comparison of neutron star models with gravitational events related to compact objects and that in such a case observations may have preference for a positive self-interaction in the boson sector.","PeriodicalId":10282,"journal":{"name":"Classical and Quantum Gravity","volume":"36 1","pages":""},"PeriodicalIF":3.5,"publicationDate":"2025-03-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143745110","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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