Classical and Quantum Gravity最新文献

Effective-one-body numerical-relativity waveform model for eccentric spin-precessing binary black hole coalescence 偏心自旋前处理双黑洞凝聚的有效单体数值相对论波形模型

IF 3.5 3区物理与天体物理

Classical and Quantum Gravity Pub Date : 2024-09-05 DOI: 10.1088/1361-6382/ad72ca

Xiaolin Liu, Zhoujian Cao and Zong-Hong Zhu

{"title":"Effective-one-body numerical-relativity waveform model for eccentric spin-precessing binary black hole coalescence","authors":"Xiaolin Liu, Zhoujian Cao and Zong-Hong Zhu","doi":"10.1088/1361-6382/ad72ca","DOIUrl":"https://doi.org/10.1088/1361-6382/ad72ca","url":null,"abstract":"Waveform models are important to gravitational wave data analysis. People recently pay much attention to the waveform model construction for eccentric binary black hole (BBH) coalescence. Several effective-one-body (EOB) Numerical-Relativity waveform models of eccentric BBH coalescence have been constructed. But none of them can treat orbit eccentricity and spin-precessing simultaneously. The current paper focuses on this problem. The authors previously have constructed waveform model for spin-aligned eccentric BBH coalescence SEOBNRE. Here we extend such waveform model to describe eccentric spin-precessing BBH coalescence. We calculate the 2PN orbital radiation-reaction forces and the instantaneous part of the decomposed waveform for a general spinning precessing BBH system in EOB coordinates. We implement these results based on our previous SEOBNRE waveform model. We have also compared our model waveforms to both SXS and RIT numerical relativity waveforms. We find good consistency between our model and numerical relativity. Based on our new waveform model, we analyze the impact of the non-perpendicular spin contributions on waveform accuracy. We find that the non-perpendicular spin contributions primarily affect the phase of the gravitational waveforms. For the current gravitational wave detectors, this contribution is not significant. The future detectors may be affected by such non-perpendicular spin contributions. More importantly our SEOBNRE waveform model, as the first theoretical waveform model to describe eccentric spin-precessing BBH coalescence, can help people to analyze orbit eccentricity and spin precession simultaneously for gravitational wave detection data.","PeriodicalId":10282,"journal":{"name":"Classical and Quantum Gravity","volume":null,"pages":null},"PeriodicalIF":3.5,"publicationDate":"2024-09-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142142517","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 geometric perspective on the origin of quantum-conditioned curvatures 从量子几何角度看量子条件曲率的起源

IF 3.5 3区物理与天体物理

Classical and Quantum Gravity Pub Date : 2024-09-05 DOI: 10.1088/1361-6382/ad7451

Abdel Nasser Tawfik, Antonio Pasqua, Muhammad Waqas, Azzah A Alshehri and Prabir Kr Haldar

{"title":"Quantum geometric perspective on the origin of quantum-conditioned curvatures","authors":"Abdel Nasser Tawfik, Antonio Pasqua, Muhammad Waqas, Azzah A Alshehri and Prabir Kr Haldar","doi":"10.1088/1361-6382/ad7451","DOIUrl":"https://doi.org/10.1088/1361-6382/ad7451","url":null,"abstract":"The quantization of the gravitational field, which includes the metric field, has been investigated using various methods such as loop quantum gravity, quantum field theory, and string theory. Nevertheless, an alternative strategy to tackle the challenge of merging the fundamentally different theories of general relativity (GR) and quantum mechanics (QM) is through a quantum geometric approach. This particular approach entails extending QM to relativistic energies and finite gravitational fields, while also expanding the continuous Riemann to a discretized (quantized) Finsler–Hamilton geometry. By embracing this method, it may be feasible to bridge the gap between GR and QM or even achieve their unification. The resulting fundamental tensor appears to blend its original classical and quantum characteristics, effectively integrating quantum-mechanically induced revisions to the affine connections and spacetime curvatures. Our study primarily focuses on investigating the Ricci curvature tensor in the context of the Einstein–Gilbert–Straus metric. By employing both analytical and numerical methods, we have identified quantum-conditioned curvatures (QCC) that act as additional sources of gravitation. These QCC exhibit a fundamental difference from the traditional curvatures described by Einsteinian GR. While the Ricci curvatures are predominantly positive across most regions, the quantized Ricci curvatures display negativity. We conclude that the QCC (a) possess an intrinsic, essential, and real character, (b) should not be disregarded due to their significant magnitude, and (c) are fundamentally different from the curvatures found in classical GR. Moreover, we conclude that the proposed quantum geometric approach may offer an alternative mathematical framework for understanding the emergence of quantum gravity.","PeriodicalId":10282,"journal":{"name":"Classical and Quantum Gravity","volume":null,"pages":null},"PeriodicalIF":3.5,"publicationDate":"2024-09-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142142541","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

Comparing eccentric waveform models based on post-Newtonian and effective-one-body approaches 比较基于后牛顿法和有效单体法的偏心波形模型

IF 3.5 3区物理与天体物理

Classical and Quantum Gravity Pub Date : 2024-09-04 DOI: 10.1088/1361-6382/ad72cb

Balázs Kacskovics and Dániel Barta

引用次数: 0

Real-time methods in JT/SYK holography JT/SYK 全息技术中的实时方法

IF 3.5 3区物理与天体物理

Classical and Quantum Gravity Pub Date : 2024-09-03 DOI: 10.1088/1361-6382/ad721b

Raúl Arias, Marcelo Botta-Cantcheff and Pedro J Martinez

{"title":"Real-time methods in JT/SYK holography","authors":"Raúl Arias, Marcelo Botta-Cantcheff and Pedro J Martinez","doi":"10.1088/1361-6382/ad721b","DOIUrl":"https://doi.org/10.1088/1361-6382/ad721b","url":null,"abstract":"We study the conventional holographic recipes and its real-time extensions in the context of the correspondence between Sachdev–Ye–Kitaev quantum mechanics and JT gravity. We first observe that only closed contours are allowed to have a 2d space-time holographic dual and standard holographic formulas. Thus, in a real-time formulation of the duality, the boundaries of a classical connected geometry are a set of closed curves, parameterized by a complex time contour as in the Schwinger–Keldysh framework. In this context, a consistent extension of the standard holographic formulas can be proposed, describing the (real-time) correspondence between gravity and boundary quantum models that include averaging on the coupling constants. We investigate the proposed prescription in different AdS solutions with Schwinger–Keldysh boundary condition, dual to a boundary quantum theory at finite temperature defined on a complex time contour, and consider also classical, asymptotically AdS solutions (wormholes) with two disconnected boundaries. In doing this, we revisit the so-called factorization problem, and its resolution in conventional holography by virtue of some (non-local) coupling between disconnected boundaries, and we show how in specific contexts, the averaging proposal by-passes the paradox as well, since it induces a similar effective coupling.","PeriodicalId":10282,"journal":{"name":"Classical and Quantum Gravity","volume":null,"pages":null},"PeriodicalIF":3.5,"publicationDate":"2024-09-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142130598","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 new 2+1 coherent spin-foam vertex for quantum gravity 量子引力的新 2+1 相干自旋泡沫顶点

IF 3.5 3区物理与天体物理

Classical and Quantum Gravity Pub Date : 2024-09-03 DOI: 10.1088/1361-6382/ad721e

J D Simão

引用次数: 0

Improved model of large-field inflation with primordial black hole production in Starobinsky-like supergravity 类斯塔罗宾斯基超引力中原始黑洞产生的大场膨胀改进模型

IF 3.5 3区物理与天体物理

Classical and Quantum Gravity Pub Date : 2024-09-02 DOI: 10.1088/1361-6382/ad7187

Ryotaro Ishikawa and Sergei V Ketov

{"title":"Improved model of large-field inflation with primordial black hole production in Starobinsky-like supergravity","authors":"Ryotaro Ishikawa and Sergei V Ketov","doi":"10.1088/1361-6382/ad7187","DOIUrl":"https://doi.org/10.1088/1361-6382/ad7187","url":null,"abstract":"A viable model of large-field (chaotic) inflation with efficient production of primordial black holes is proposed in Starobinsky-like (modified) supergravity leading to the ‘no-scale-type’ Kähler potential and the Wess-Zumino-type (‘renormalizable’) superpotential. The cosmological tilts are in good (within 1σ) agreement with Planck measurements of the cosmic microwave background radiation. In addition, the power spectrum of scalar perturbations has a large peak at smaller scales, which leads to a production of primordial black holes from gravitational collapse of large perturbations with the masses about 1017 g. The masses are beyond the Hawking (black hole) evaporation limit of 1015 g, so that those primordial black holes may be viewed as viable candidates for a significant part or the whole of the current dark matter. The parameters of the superpotential were fine-tuned for those purposes, while the cubic term in the superpotential is essential whereas the quadratic term should vanish. The vacuum after inflation (relevant to reheating) is Minkowskian. The energy density fraction of the gravitational waves induced by the production of primordial black holes and their frequency were also calculated in the second order with respect to perturbations.","PeriodicalId":10282,"journal":{"name":"Classical and Quantum Gravity","volume":null,"pages":null},"PeriodicalIF":3.5,"publicationDate":"2024-09-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142123474","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

Measurement of the thermal accommodation coefficient of helium on a crystalline silicon surface at low-temperatures 测量晶体硅表面低温下的氦热容纳系数

IF 3.5 3区物理与天体物理

Classical and Quantum Gravity Pub Date : 2024-09-02 DOI: 10.1088/1361-6382/ad7184

Alexander Franke, Nils Sültmann, Christoph Reinhardt, Sandy Croatto, Jörn Schaffran, Hossein Masalehdan, Axel Lindner and Roman Schnabel

引用次数: 0

Inflation and dark matter from the low entropy hypothesis and modeling mechanism of modified gravity 从低熵假说看膨胀和暗物质以及修正引力的建模机制

IF 3.5 3区物理与天体物理

Classical and Quantum Gravity Pub Date : 2024-09-02 DOI: 10.1088/1361-6382/ad721c

Jackie C H Liu

{"title":"Inflation and dark matter from the low entropy hypothesis and modeling mechanism of modified gravity","authors":"Jackie C H Liu","doi":"10.1088/1361-6382/ad721c","DOIUrl":"https://doi.org/10.1088/1361-6382/ad721c","url":null,"abstract":"The hypothesis of low entropy in the initial state of the Universe usually explains the observed entropy increase is in only one time direction: the thermodynamic arrow of time. The Hamiltonian formalism is commonly used in the context of general relativity. The set of Lagrange multipliers are introduced in the formalism, and they are corresponding to the Hamiltonian constraints which are written in terms of ‘weak equality’—the equality is satisfied if the constraints hold. Follow the low-entropy hypothesis, we postulate a modeling mechanism—a weak equality (of modeling) that holds only on the subspace of the theory space of physical models defined by some modeling constraints. By applying the modeling mechanism, we obtain a specific model of modified gravity under specific modeling conditions. We derive a novel equation of modeling from the mechanism, that describes how different gravitational models emerge. The solution of the modeling equation naturally turns out to be the model of R2-gravity (with additional terms) if ordinary matter is negligible. We also found that this mechanism leads to two models: large-field inflation and wave-like dark matter (DM). Interestingly, the wave-like DM model is supported by the most recent observations of Einstein rings.","PeriodicalId":10282,"journal":{"name":"Classical and Quantum Gravity","volume":null,"pages":null},"PeriodicalIF":3.5,"publicationDate":"2024-09-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142123475","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

Distribution of distance-based quantum resources outside a radiating Schwarzschild black hole 辐射型施瓦兹柴尔德黑洞外基于距离的量子资源分布

IF 3.5 3区物理与天体物理

Classical and Quantum Gravity Pub Date : 2024-09-01 DOI: 10.1088/1361-6382/ad70ea

Samira Elghaayda, Xiang Zhou and Mostafa Mansour

{"title":"Distribution of distance-based quantum resources outside a radiating Schwarzschild black hole","authors":"Samira Elghaayda, Xiang Zhou and Mostafa Mansour","doi":"10.1088/1361-6382/ad70ea","DOIUrl":"https://doi.org/10.1088/1361-6382/ad70ea","url":null,"abstract":"This study aims to investigate the distribution of distance-based quantum resources for fermionic fields in curved Schwarzschild spacetime (SST), as well as for bosonic fields in both flat Minkowski and curved SSTs. To achieve this, we will examine the quantum resources between an observer falling into a Schwarzschild black hole (SBH) and their stationary partner, who shares a Gisin state. Additionally, we will explore the quantum resources that arise when two uniformly accelerated detectors interact with bosonic fields in the Minkowski vacuum. Furthermore, we will investigate the interactions between these detectors and bosonic fields in the Hartle–Hawking and Boulware vacuums outside the SBH. At an infinite Hawking temperature, the quantum resources for the fermionic fields degrade; the rate of degradation is dependent on the distance between the observer and the event horizon, the fermionic frequency mode, and the Gisin state parameters. In the case of the bosonic fields, our results show that entanglement decreases monotonically, either towards zero or a constant value. Moreover, with increasing Unruh temperature, coherence and discord undergo sudden death followed by a sudden birth, and entanglement cannot be revived for a given initial state. Based on our findings, it appears that the Fermi–Dirac and Bose–Einstein statistics represent the primary differences in quantum resource distribution between the fermionic and bosonic cases. These findings may be essential for enhancing our understanding of the distribution of quantum resources in relativistic frameworks.","PeriodicalId":10282,"journal":{"name":"Classical and Quantum Gravity","volume":null,"pages":null},"PeriodicalIF":3.5,"publicationDate":"2024-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142118226","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 motion of twisted particles in a stellar gravitational field 恒星引力场中扭曲粒子的运动

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/ad721d

Dan-Dan Lian and Peng-Ming Zhang

{"title":"The motion of twisted particles in a stellar gravitational field","authors":"Dan-Dan Lian and Peng-Ming Zhang","doi":"10.1088/1361-6382/ad721d","DOIUrl":"https://doi.org/10.1088/1361-6382/ad721d","url":null,"abstract":"In this work, we explore the motion of a twisted particle possessing intrinsic orbital angular momentum (OAM) as it traverses a weak stellar gravitational field, which we approximate using a polytropic model. We disregard the spin characteristic of the twisted particle, modeling it as a massless complex twisted scalar wave packet to simplify its interaction with gravitational fields. Building on this simplification, we determine the trajectory of this twisted particle by using the center of its energy density and investigate the gravitational birefringence induced by its OAM. In a weak field approximation, we find the gravitational birefringence-OAM relationship parallels that with spin, as described by the Mathisson-Papapetrou-Dixon equations. This indicates that the gravitational birefringence induced by OAM can potentially exceed that induced by spin by several orders of magnitude, significantly enhancing its detectability. To broaden our analysis, we introduce a nonminimal coupling term, , into the Lagrangian, resulting in the modified expression . This adjustment is necessitated by the quantization of the scalar field in curved spacetime. We then explore the effects of this term on the motion of the twisted particle. Our findings show that the trajectory of the twisted particle under nonminimal coupling (λ ≠ 0) differs from that in the minimal coupling scenario (λ = 0). Specifically, for a positive nonminimal coupling constant λ, the trajectory of the twisted particle is expected to deviate away from the stellar center, compared to the minimal coupling scenario.","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":"142101980","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