Classical and Quantum Gravity最新文献_第4页

Effective anisotropic dynamics in group field theory cosmology 群场论宇宙学中的有效各向异性动力学

IF 3.5 3区物理与天体物理

Classical and Quantum Gravity Pub Date : 2024-08-29 DOI: 10.1088/1361-6382/ad70ed

Daniele Oriti and Yi-Li Wang

引用次数: 0

Estimate of force noise from electrostatic patch potentials in LISA Pathfinder 估计 LISA 探路者中静电贴片电位的力噪声

IF 3.5 3区物理与天体物理

Classical and Quantum Gravity Pub Date : 2024-08-29 DOI: 10.1088/1361-6382/ad7089

S Vitale, V Ferroni, L Sala and W J Weber

引用次数: 0

Twistor theory of the Chen–Teo gravitational instanton * 陈-张引力瞬子的孪生理论 *

IF 3.5 3区物理与天体物理

Classical and Quantum Gravity Pub Date : 2024-08-29 DOI: 10.1088/1361-6382/ad70eb

Maciej Dunajski and Paul Tod

引用次数: 0

Self-interactions can (also) destabilize bosonic stars 自相互作用（也）能破坏玻色恒星的稳定

IF 3.5 3区物理与天体物理

Classical and Quantum Gravity Pub Date : 2024-08-29 DOI: 10.1088/1361-6382/ad7188

Marco Brito, Carlos Herdeiro, Nicolas Sanchis-Gual, Etevaldo dos Santos Costa Filho and Miguel Zilhão

引用次数: 0

Gravitational waves on Kerr black holes: I. Reconstruction of linearized metric perturbations 克尔黑洞上的引力波：I. 重构线性化度量扰动

IF 3.5 3区物理与天体物理

Classical and Quantum Gravity Pub Date : 2024-08-29 DOI: 10.1088/1361-6382/ad6c9c

Roman Berens, Trevor Gravely and Alexandru Lupsasca

{"title":"Gravitational waves on Kerr black holes: I. Reconstruction of linearized metric perturbations","authors":"Roman Berens, Trevor Gravely and Alexandru Lupsasca","doi":"10.1088/1361-6382/ad6c9c","DOIUrl":"https://doi.org/10.1088/1361-6382/ad6c9c","url":null,"abstract":"The gravitational perturbations of a rotating Kerr black hole are notoriously complicated, even at the linear level. In 1973, Teukolsky showed that their physical degrees of freedom are encoded in two gauge-invariant Weyl curvature scalars that obey a separable wave equation. Determining these scalars is sufficient for many purposes, such as the computation of energy fluxes. However, some applications—such as second-order perturbation theory—require the reconstruction of metric perturbations. In principle, this problem was solved long ago, but in practice, the solution has never been worked out explicitly. Here, we do so by writing down the metric perturbation (in either ingoing or outgoing radiation gauge) that corresponds to a given mode of either Weyl scalar. Our formulas make no reference to the Hertz potential (an intermediate quantity that plays no fundamental role) and involve only the radial and angular Kerr modes, but not their derivatives, which can be altogether eliminated using the Teukolsky–Starobinsky identities. We expect these analytic results to prove useful in numerical studies and for extending black hole perturbation theory beyond the linear regime.","PeriodicalId":10282,"journal":{"name":"Classical and Quantum Gravity","volume":null,"pages":null},"PeriodicalIF":3.5,"publicationDate":"2024-08-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142101126","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

Holographic phenomenology via overlapping degrees of freedom 通过重叠自由度的全息现象学

IF 3.5 3区物理与天体物理

Classical and Quantum Gravity Pub Date : 2024-08-27 DOI: 10.1088/1361-6382/ad6e4d

Oliver Friedrich, ChunJun Cao, Sean M Carroll, Gong Cheng and Ashmeet Singh

{"title":"Holographic phenomenology via overlapping degrees of freedom","authors":"Oliver Friedrich, ChunJun Cao, Sean M Carroll, Gong Cheng and Ashmeet Singh","doi":"10.1088/1361-6382/ad6e4d","DOIUrl":"https://doi.org/10.1088/1361-6382/ad6e4d","url":null,"abstract":"The holographic principle suggests that regions of space contain fewer physical degrees of freedom than would be implied by conventional quantum field theory. Meanwhile, in Hilbert spaces of large dimension 2n, it is possible to define Pauli algebras that are nearly anti-commuting (but not quite) and which can be thought of as ‘overlapping degrees of freedom’. We propose to model the phenomenology of holographic theories by allowing field-theory modes to be overlapping, and derive potential observational consequences. In particular, we build a Fermionic quantum field whose effective degrees of freedom approximately obey area scaling and satisfy a cosmic Bekenstein bound, and compare predictions of that model to cosmic neutrino observations. Our implementation of holography implies a finite lifetime of plane waves, which depends on the overall UV cutoff of the theory. To allow for neutrino flux from blazar TXS 0506+056 to be observable, our model needs to have a cutoff . This is broadly consistent with current bounds on the energy spectrum of cosmic neutrinos from IceCube, but high energy neutrinos are a potential challenge for our model of holography. We motivate our construction via quantum mereology, i.e. using the idea that EFT degrees of freedom should emerge from an abstract theory of quantum gravity by finding quasi-classical Hilbert space decompositions. We also discuss how to extend the framework to Bosons. Finally, using results from random matrix theory we derive an analytical understanding of the energy spectrum of our theory. The numerical tools used in this work are publicly available within the GPUniverse package, https://github.com/OliverFHD/GPUniverse.","PeriodicalId":10282,"journal":{"name":"Classical and Quantum Gravity","volume":null,"pages":null},"PeriodicalIF":3.5,"publicationDate":"2024-08-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142084785","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

Hidden symmetries of power-law inflation 幂律膨胀的隐藏对称性

IF 3.5 3区物理与天体物理

Classical and Quantum Gravity Pub Date : 2024-08-27 DOI: 10.1088/1361-6382/ad7185

Takeshi Chiba and Tsuyoshi Houri

引用次数: 0

New insights on the signature change via the Colombeau framework 通过科隆博框架对特征变化的新认识

IF 3.5 3区物理与天体物理

Classical and Quantum Gravity Pub Date : 2024-08-26 DOI: 10.1088/1361-6382/ad6f68

J A Silva, F C Carvalho and A R G Garcia

引用次数: 0

Time-dependent scalings and Fock quantization of a massless scalar field in Kantowski–Sachs 康托夫斯基-萨克斯（Kantowski-Sachs）中无质量标量场的时变标度和福克量子化

IF 3.5 3区物理与天体物理

Classical and Quantum Gravity Pub Date : 2024-08-26 DOI: 10.1088/1361-6382/ad6e4a

Jerónimo Cortez, Guillermo A Mena Marugán, Álvaro Torres-Caballeros and José Velhinho

{"title":"Time-dependent scalings and Fock quantization of a massless scalar field in Kantowski–Sachs","authors":"Jerónimo Cortez, Guillermo A Mena Marugán, Álvaro Torres-Caballeros and José Velhinho","doi":"10.1088/1361-6382/ad6e4a","DOIUrl":"https://doi.org/10.1088/1361-6382/ad6e4a","url":null,"abstract":"We address the issue of inequivalent Fock representations in quantum field theory in a curved homogenous and anisotropic cosmological background, namely Kantowski–Sachs spacetime, which can also be used to describe the interior of a nonrotating black hole. A family of unitarily equivalent Fock representations that are invariant under the spatial isometries and implement a unitary dynamics can be achieved by means of a field redefinition that consists of a specific anisotropic scaling of the field configuration and a linear transformation of its momentum. Remarkably, we show that this kind of field redefinition is in fact unique under our symmetry and unitary requirements. However, the physical properties of the Hamiltonian dynamics that one obtains in this way are not satisfactory, inasmuch as the action of the Hamiltonian on the corresponding particle states is ill defined. To construct a quantum theory without this problem, we need a further canonical transformation that is time- and mode-dependent and is not interpretable as an anisotropic scaling. The old and new Fock representations, nevertheless, are unitarily equivalent. The freedom that is introduced when allowing for this further canonical transformation can be fixed by demanding an asymptotic diagonalization of the Hamiltonian and a minimal absorption of dynamical phases. In this way, the choice of vacuum and the associated Fock representation are asymptotically determined.","PeriodicalId":10282,"journal":{"name":"Classical and Quantum Gravity","volume":null,"pages":null},"PeriodicalIF":3.5,"publicationDate":"2024-08-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142084916","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

Emergence of cosmic space and horizon thermodynamics from Kaniadakis entropy 从卡尼达基斯熵看宇宙空间和地平线热力学的出现

IF 3.5 3区物理与天体物理

Classical and Quantum Gravity Pub Date : 2024-08-22 DOI: 10.1088/1361-6382/ad6e4e

Pranav Prasanthan, Sarath Nelleri, Navaneeth Poonthottathil and Sreejith E K

引用次数: 0