CLASSICAL AND QUANTUM GRAVITY 是引力和时空理论领域的物理学家、数学家和宇宙学家的知名期刊。该杂志现在是公认的经典相对论和量子引力所有领域的世界领导者。

Classical and Quantum Gravity is a renowned journal in the field of gravity and spacetime theory, widely recognized by physicists, mathematicians, and cosmologists. The journal is acknowledged as a world leader in all areas of classical relativity and quantum gravity.

《Classical and Quantum Gravity》是引力和时空理论领域的知名期刊，受到物理学家、数学家和宇宙学家的广泛认可。该杂志被公认为经典相对论和量子引力各个领域的全球领导者。

Classical and Quantum Gravity

We explore the construction and stability of asymptotically anti-de Sitter Euclidean wormholes in a variety of models. In simple ad hoc low-energy models, it is not hard to construct two-boundary Euclidean wormholes that dominate over disconnected solutions and which are stable (lacking negative modes) in the usual sense of Euclidean quantum gravity. Indeed, the structure of such solutions turns out to strongly resemble that of the Hawking-Page phase transition for AdS-Schwarzschild black holes, in that for boundary sources above some threshold we find both a `large' and a `small' branch of wormhole solutions with the latter being stable and dominating over the disconnected solution for large enough sources. We are also able to construct two-boundary Euclidean wormholes in a variety of string compactifications that dominate over the disconnected solutions we find and that are stable with respect to field-theoretic perturbations. However, as in classic examples investigated by Maldacena and Maoz, the wormholes in these UV-complete settings always suffer from brane-nucleation instabilities (even when sources that one might hope would stabilize such instabilities are tuned to large values). This indicates the existence of additional disconnected solutions with lower action. We discuss the significance of such results for the factorization problem of AdS/CFT.

Donald Marolf

Jorge E Santos

AdS Euclidean wormholes

反德西特欧几里得虫洞

We derive a formula for the black hole entropy in theories with gravitational Chern-Simons terms, by generalizing Wald's argument which uses the Noether charge. It correctly reproduces the entropy of three-dimensional black holes in the presence of Chern-Simons term, which was previously obtained via indirect methods.

Yuji Tachikawa

Class. Quantum Grav.

Black hole entropy in the presence of Chern–Simons terms

存在Chern-Simons项的黑洞熵

We present geometric derivations of the Smarr formula for static AdS black holes and an expanded first law that includes variations in the cosmological constant. These two results are further related by a scaling argument based on Euler's theorem. The key new ingredient in the constructions is a two-form potential for the static Killing field. Surface integrals of the Killing potential determine the coefficient of the variation of the cosmological constant in the first law. This coefficient is proportional to a finite, effective volume for the region outside the AdS black hole horizon, which can also be interpreted as minus the volume excluded from a spatial slice by the black hole horizon. This effective volume also contributes to the Smarr formula. Since the cosmological constant is naturally thought of as a pressure, the new term in the first law has the form of effective volume times change in pressure that arises in the variation of the enthalpy in classical thermodynamics. This and related arguments suggest that the mass of an AdS black hole should be interpreted as the enthalpy of the spacetime.

David Kastor

Sourya Ray

Jennie Traschen

Enthalpy and the mechanics of AdS black holes

焓与AdS黑洞的力学

Cosmological constant can always be considered as the on-shell value of a top form in gravitational theories. The top form is field strength of a gauge field, and the theory enjoys a gauge symmetry. We show that cosmological constant is the charge of global part of the gauge symmetry, and is conserved irrespective of the dynamics of the metric and other fields. In addition, we introduce its conjugate chemical potential, and prove the generalized first law of thermodynamics which includes variation of cosmological constant as a conserved charge. We discuss how our new term in the first law is related to the volume-pressure term. In parallel with the seminal Wald entropy, this analysis suggests that pressure can also be considered as a conserved charge.

Dmitry Chernyavsky

Kamal Hajian

Cosmological constant is a conserved charge

宇宙常数是一个守恒电荷

The energy spectra of gravitational waves (GW) produced in quintessential inflationary models increase in frequency and exhibit a sharp spike around 170 GHz where the associated fraction of critical energy density today stored in relic gravitons is of the order of $10^{-6}$. We contrast our findings with the spectra of ordinary inflationary models and we comment about possible detetction strategies of the spike.

Massimo Giovannini

Spikes in the relic graviton background from quintessential inflation

遗迹引力子背景中的尖峰来自精质暴涨

Abstract We study the semi-classical limit of the recently proposed coherent spin foam model for (2+1) Lorentzian quantum gravity. Specifically, we analyze the gluing equations derived from the stationary phase approximation of the vertex amplitude. Typically these exhibit two solutions yielding a cosine of the Regge action. However, by inspection of the algebraic equations as well as their geometrical realization, we show in this note that the behavior is more nuanced: when all triangles are either spacelike or timelike, two solutions exist. In any other case, only a single solution is obtained, thus yielding a single Regge exponential.

Alexander Florian Jercher

José Diogo Simāo

Sebastian Steinhaus

Partial absence of cosine problem in 3d Lorentzian spin foams

3d洛伦兹自旋泡沫中的余弦问题部分缺失

Abstract Current- and next-generation gravitational-wave observatories may reveal new, ultralight bosons. Through the superradiance process, these theoretical particle candidates can form clouds around astrophysical black holes and result in detectable gravitational-wave radiation. In the absence of detections, constraints—contingent on astrophysical assumptions—have been derived using LIGO-Virgo-KAGRA data on boson masses. However, the searches for ultralight scalars to date have not adequately considered self-interactions between particles. Self-interactions that significantly alter superradiance dynamics are generically present for many scalar models, including axion-like dark matter candidates and string axions. We implement the most complete treatment of particle self-interactions available to determine the gravitational-wave signatures expected from superradiant scalar clouds and revisit the constraints obtained in a past gravitational-wave search targeting the black hole in Cygnus X-1. We also project the reach of next-generation gravitational-wave observatories to scalar particle parameter space in the mass-coupling plane. We find that while proposed observatories have insufficient reach to self-interactions that can halt black hole spin down, next-generation observatories are essential for expanding the search beyond gravitational parameter space and can reach a mass and interaction scale of ∽ 10 -13 –10 -12 eV/c 2 and ≥ 10 17 GeV, respectively.

Spencer Collaviti

Ling Sun

Marios Galanis

Masha Baryakhtar

Observational prospects of self-interacting scalar superradiance with next-generation gravitational-wave detectors

下一代引力波探测器对自相互作用标量超辐射的观测前景

Abstract We revisit the static spherically symmetric solutions of Einstein’s General Relativity with a conformally coupled scalar field in arbitrary dimensions. Using a four rank tensor introduced earlier we recast the field equations in a manifestly symmetric form to elucidate a somewhat less-known feature of dual mapping between solutions. We also show that there is a two-parameter subfamily of solutions which enjoy a duality symmetry and in four dimensions both the BBMB black hole and the Barcelo-Visser wormhole belong to this subfamily. Along the way, we rederive the full three-parameter family of solutions by direct integration of the field equations and a natural choice of ansatz which arguably has several advantages over other previously known methods.

Revisiting the static spherically symmetric solutions of gravity with a conformally coupled scalar field

重新审视带有共形耦合标量场的静态球对称引力解

Abstract This work explores the relation between two data-analysis methods used in the search for continuous gravitational waves in LIGO-Virgo-KAGRA data: the F-statistic and the 5-vector method. We show that the 5-vector method can be derived from a maximum likelihood framework similar to the F-statistic. Our analysis demonstrates that the two methods are statistically equivalent, providing the same detection probability for a given false alarm rate. We extend this comparison to multiple detectors, highlighting differences from the standard approach that simply combines 5-vectors from each detector. In our maximum likelihood approach, each 5-vector is weighted by the observation time and sensitivity of its respective detector, resulting in efficient estimators and analytical distributions for the detection statistic. Additionally, we present the analytical computation of sensitivity for different searches, expressed in terms of the minimum detectable amplitude.

Luca D'Onofrio

Pia Astone

Stefano Dal Pra

Sabrina D'Antonio

Matteo Di Giovanni

Rosario De Rosa

Paola Leaci

Simone Mastrogiovanni

Lorenzo Mirasola

Federico Muciaccia

Cristiano Palomba

Lorenzo Pierini

Two sides of the same coin: the F-statistic and the 5-vector method

同一硬币的两面：F统计量与5向量方法

Abstract Nonassociative modifications of general relativity, GR, and quantum gravity, QG, models naturally arise as star product and R-flux deformations considered in string/ M-theory. Such nonassociative and noncommutative geometric and quantum information theories were formulated on phase spaces defined as cotangent Lorentz bundles enabled with nonassociative symmetric and nonsymmetric metrics and nonlinear and linear connection structures. We outline the analytic methods and proofs that corresponding geometric flow evolution and dynamical field equations can be decoupled and integrated in certain general off-diagonal forms. New classes of solutions describing nonassociative black holes, wormholes, and locally anisotropic cosmological configurations are constructed using such methods. We develop the Batalin-Vilkovisky, BV, formalism for quantizing modified gravity theories, MGTs, involving twisted star products and semi-classical models of nonassociative gauge gravity with de Sitter/affine/ Poincar'{e} double structure groups. Such theories can be projected on Lorentz spacetime manifolds in certain forms equivalent to GR or MGTs with torsion generalizations etc. We study the properties of the classical and quantum BV operators for nonassociative phase spaces and nonassociative gauge gravity. Recent results and methods from algebraic QFT are generalized to involve nonassociative star product deformations of the anomalous master Ward identity. Such constructions are elaborated in a nonassociative BV perspective and for developing non-perturbative methods in QG.

短名	Class. Quantum Grav.
Journal Impact	3.66
国际分区	QUANTUM SCIENCE & TECHNOLOGY(Q2)
期刊索引	SCI Q2中科院 3 区

ISSN	0264-9381, 1361-6382
h-index	188
国内分区	物理与天体物理(3区)物理与天体物理天文与天体物理(3区)物理与天体物理物理综合(3区)物理与天体物理物理粒子与场物理(4区)物理与天体物理量子科技(4区)

涉及主题	物理量子力学数学数学物理经典力学理论物理学天文几何学计算机科学天体物理学工程类数学分析纯数学万有引力时空
出版信息	出版商: IOP Publishing Ltd.，出版周期: Semimonthly，期刊类型: journal，开源期刊: 否
基本数据	创刊年份: 1984，原创研究文献占比: 99.44%，自引率:11.10%， Gold OA占比: 26.46%
平均审稿周期	网友分享经验：较快,2-4周
平均录用比例	网友分享经验：较易

Classical and Quantum Gravity

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