Pub Date : 2026-01-28DOI: 10.1088/1361-6382/ae32da
David Fajman and Hannah Seer
We construct new static solutions to the Einstein–Vlasov–Maxwell system. These solutions model Reissner–Nordström-type black holes with surrounding shells of charged matter.
{"title":"Charged black holes surrounded by shells of charged particles","authors":"David Fajman and Hannah Seer","doi":"10.1088/1361-6382/ae32da","DOIUrl":"https://doi.org/10.1088/1361-6382/ae32da","url":null,"abstract":"We construct new static solutions to the Einstein–Vlasov–Maxwell system. These solutions model Reissner–Nordström-type black holes with surrounding shells of charged matter.","PeriodicalId":10282,"journal":{"name":"Classical and Quantum Gravity","volume":"7 1","pages":""},"PeriodicalIF":3.5,"publicationDate":"2026-01-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146056977","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}
Pub Date : 2026-01-28DOI: 10.1088/1361-6382/ae399a
Jia-Hao Xu and Qi Liu
Magnetic noises play a key role in the instrument sensitivity in the low frequency regime, which corresponds to the measurement band of interest for future space-based gravitational wave detection. The magnetic noises can be divided into those that are time variant, but independent of test mass position (direct terms) and those that are time invariant, but a function of position (stiffness terms). The direct terms have been analyzed through the LISA Pathfinder on-orbit magnetic experiments (Armano et al 2025 Phys. Rev. Lett.134 071401), while the stiffness terms have not been estimated in depth. In this paper, we present an estimate of the magnetic stiffness contribution to the instrument performance based on typical parameters of the test mass magnetic properties and the local magnetic field environment. Our results show that, if the relative motion between the TianQin spacecraft and the test mass can reach the designed level of , the residual acceleration due to magnetic stiffness noise is at the level of . Under these conditions, magnetic stiffness noise is not significant for the TianQin mission.
磁噪声对仪器在低频波段的灵敏度起着关键作用，这对应于未来天基引力波探测感兴趣的测量波段。磁噪声可分为时变但与测试质量位置无关的磁噪声（直接项）和时变但与位置有关的磁噪声（刚度项）。直接项已通过LISA探路者在轨磁实验（Armano et al 2025 Phys）进行了分析。Rev. letter .134 071401)，而刚度项尚未深入估计。本文根据测试质量磁性能的典型参数和局部磁场环境，估计了磁刚度对仪器性能的贡献。结果表明，当天琴号航天器与试验质量的相对运动达到设计水平时，由磁刚度噪声引起的剩余加速度为。在这些条件下，天琴任务的磁刚度噪声不显著。
{"title":"Estimate of magnetic stiffness noise in space-based gravitational wave detection","authors":"Jia-Hao Xu and Qi Liu","doi":"10.1088/1361-6382/ae399a","DOIUrl":"https://doi.org/10.1088/1361-6382/ae399a","url":null,"abstract":"Magnetic noises play a key role in the instrument sensitivity in the low frequency regime, which corresponds to the measurement band of interest for future space-based gravitational wave detection. The magnetic noises can be divided into those that are time variant, but independent of test mass position (direct terms) and those that are time invariant, but a function of position (stiffness terms). The direct terms have been analyzed through the LISA Pathfinder on-orbit magnetic experiments (Armano et al 2025 Phys. Rev. Lett.134 071401), while the stiffness terms have not been estimated in depth. In this paper, we present an estimate of the magnetic stiffness contribution to the instrument performance based on typical parameters of the test mass magnetic properties and the local magnetic field environment. Our results show that, if the relative motion between the TianQin spacecraft and the test mass can reach the designed level of , the residual acceleration due to magnetic stiffness noise is at the level of . Under these conditions, magnetic stiffness noise is not significant for the TianQin mission.","PeriodicalId":10282,"journal":{"name":"Classical and Quantum Gravity","volume":"143 1","pages":""},"PeriodicalIF":3.5,"publicationDate":"2026-01-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146056979","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}
Pub Date : 2026-01-23DOI: 10.1088/1361-6382/ae30c6
Chengjian Luo, Menghe Wu, Lang Chen, Fuli Chen and Tianquan Gao
As a core technology for space-based gravitational wave detection, intersatellite laser ranging achieves gravitational wave signal capture by precisely measuring the relative distance between test masses in remote and local satellites. However, the complex space gravity-field environment surrounding the detectors can perturb the geodesic motion of test masses within the satellites. For the satellite following the motion of test masses, the space gravity-field environment induces sensitive axis pointing deviations and optical reference offsets of the satellite telescopes, which constitute critical components of tilt-to-length coupling noise (TTL noise). This noise will vary phases and propagates as noise into the range signals of space-based gravitational wave detection, ultimately causing range errors, ultimately degrading intersatellite ranging precision. Based on the TianQin mission with Gaussian beam, this study conducts numerical simulations of the TTL noise induced by the space gravity-field environment and implements compensation through two approaches: modeling the motion of the telescope plane and adaptive optical system simulations. The simulation results show that the application of modeling the motion of the telescope plane and adaptive optical system simulation methods effectively mitigates phase noise caused by TTL noise, providing innovative technical pathways and methodologies for addressing TTL noise in space-based gravitational wave detection.
{"title":"Research on TTL noise suppression of space gravitational wave detection: using modeling the motion of the telescope plane and adaptive optical systems","authors":"Chengjian Luo, Menghe Wu, Lang Chen, Fuli Chen and Tianquan Gao","doi":"10.1088/1361-6382/ae30c6","DOIUrl":"https://doi.org/10.1088/1361-6382/ae30c6","url":null,"abstract":"As a core technology for space-based gravitational wave detection, intersatellite laser ranging achieves gravitational wave signal capture by precisely measuring the relative distance between test masses in remote and local satellites. However, the complex space gravity-field environment surrounding the detectors can perturb the geodesic motion of test masses within the satellites. For the satellite following the motion of test masses, the space gravity-field environment induces sensitive axis pointing deviations and optical reference offsets of the satellite telescopes, which constitute critical components of tilt-to-length coupling noise (TTL noise). This noise will vary phases and propagates as noise into the range signals of space-based gravitational wave detection, ultimately causing range errors, ultimately degrading intersatellite ranging precision. Based on the TianQin mission with Gaussian beam, this study conducts numerical simulations of the TTL noise induced by the space gravity-field environment and implements compensation through two approaches: modeling the motion of the telescope plane and adaptive optical system simulations. The simulation results show that the application of modeling the motion of the telescope plane and adaptive optical system simulation methods effectively mitigates phase noise caused by TTL noise, providing innovative technical pathways and methodologies for addressing TTL noise in space-based gravitational wave detection.","PeriodicalId":10282,"journal":{"name":"Classical and Quantum Gravity","volume":"71 1","pages":""},"PeriodicalIF":3.5,"publicationDate":"2026-01-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146021947","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}
Pub Date : 2026-01-23DOI: 10.1088/1361-6382/ae3656
Valentin Boyanov, David Hilditch and Artur Semião
In this work we obtain a numerical self-consistent spherical solution of the semiclassical Einstein equations representing the evaporation of a trapped region which initially has both an outer and an inner horizon. The classical matter source used is a static electromagnetic field, allowing for an approximately Reissner–Nordström black hole as the initial configuration, where the charge sets the initial scale of the inner horizon. The semiclassical contribution is that of a quantum scalar field in the ‘in’ vacuum state of gravitational collapse, as encoded by the renormalised stress-energy tensor in the spherical Polyakov approximation. We analyse the rate of shrinking of the trapped region, both from Hawking evaporation of the outer apparent horizon, as well as from an outward motion of the inner horizon. We also observe that a long-lived anti-trapped region forms below the inner horizon and slowly expands outward. A black-to-white-hole transition is thus obtained from purely semiclassical dynamics.
{"title":"Semiclassical evolution of a dynamically formed spherical black hole with an inner horizon","authors":"Valentin Boyanov, David Hilditch and Artur Semião","doi":"10.1088/1361-6382/ae3656","DOIUrl":"https://doi.org/10.1088/1361-6382/ae3656","url":null,"abstract":"In this work we obtain a numerical self-consistent spherical solution of the semiclassical Einstein equations representing the evaporation of a trapped region which initially has both an outer and an inner horizon. The classical matter source used is a static electromagnetic field, allowing for an approximately Reissner–Nordström black hole as the initial configuration, where the charge sets the initial scale of the inner horizon. The semiclassical contribution is that of a quantum scalar field in the ‘in’ vacuum state of gravitational collapse, as encoded by the renormalised stress-energy tensor in the spherical Polyakov approximation. We analyse the rate of shrinking of the trapped region, both from Hawking evaporation of the outer apparent horizon, as well as from an outward motion of the inner horizon. We also observe that a long-lived anti-trapped region forms below the inner horizon and slowly expands outward. A black-to-white-hole transition is thus obtained from purely semiclassical dynamics.","PeriodicalId":10282,"journal":{"name":"Classical and Quantum Gravity","volume":"30 1","pages":""},"PeriodicalIF":3.5,"publicationDate":"2026-01-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146021948","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}
Pub Date : 2026-01-21DOI: 10.1088/1361-6382/ae2cda
Chris Hull, Ulf Lindström and Maxwell L Velásquez Cotini Hutt
We construct a set of higher-form conserved currents on spacetimes admitting conformal Killing–Yano tensors. We find relations between these currents that allow the charge given by integrating one of these currents over a region to be re-expressed as an integral of a covariant quantity over the boundary. In many cases, only a non-covariant form of the boundary integral was previously known. For a special class of these currents the conservation does not rely on field equations, so they give conserved topological charges in any gravitational theory. We discuss the relation of our currents to the Komar current and derive several new properties of conformal Killing–Yano tensors. We study a number of applications of our construction to charges of black hole solutions of Einstein–Maxwell theory, and D-brane solutions of type II supergravity.
{"title":"Gravitational currents and charges from conformal Killing–Yano tensors","authors":"Chris Hull, Ulf Lindström and Maxwell L Velásquez Cotini Hutt","doi":"10.1088/1361-6382/ae2cda","DOIUrl":"https://doi.org/10.1088/1361-6382/ae2cda","url":null,"abstract":"We construct a set of higher-form conserved currents on spacetimes admitting conformal Killing–Yano tensors. We find relations between these currents that allow the charge given by integrating one of these currents over a region to be re-expressed as an integral of a covariant quantity over the boundary. In many cases, only a non-covariant form of the boundary integral was previously known. For a special class of these currents the conservation does not rely on field equations, so they give conserved topological charges in any gravitational theory. We discuss the relation of our currents to the Komar current and derive several new properties of conformal Killing–Yano tensors. We study a number of applications of our construction to charges of black hole solutions of Einstein–Maxwell theory, and D-brane solutions of type II supergravity.","PeriodicalId":10282,"journal":{"name":"Classical and Quantum Gravity","volume":"263 1","pages":""},"PeriodicalIF":3.5,"publicationDate":"2026-01-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146005967","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}
Pub Date : 2026-01-21DOI: 10.1088/1361-6382/ae3425
Salvatore Capozziello and Damianos Iosifidis
Non-local gravity can potentially solve several problems of gravitational field both at Ultra-Violet and Infra-Red scales. However, such an approach has been formulated mainly in metric formalism. In this paper, we discuss non-local theories of gravity in the metric-affine framework. In particular, we study the dynamics of metric-affine analog of some well-studied non-local theories, by treating the metric and the connection as independent fields. The approach gives the opportunity to deal with non-local gravity under a more general standard. Furthermore, we introduce some novel non-local metric-affine theories with no Riemannian analog and investigate their dynamics. Finally we discuss some cosmological applications of our development.
{"title":"Non-local metric-affine gravity","authors":"Salvatore Capozziello and Damianos Iosifidis","doi":"10.1088/1361-6382/ae3425","DOIUrl":"https://doi.org/10.1088/1361-6382/ae3425","url":null,"abstract":"Non-local gravity can potentially solve several problems of gravitational field both at Ultra-Violet and Infra-Red scales. However, such an approach has been formulated mainly in metric formalism. In this paper, we discuss non-local theories of gravity in the metric-affine framework. In particular, we study the dynamics of metric-affine analog of some well-studied non-local theories, by treating the metric and the connection as independent fields. The approach gives the opportunity to deal with non-local gravity under a more general standard. Furthermore, we introduce some novel non-local metric-affine theories with no Riemannian analog and investigate their dynamics. Finally we discuss some cosmological applications of our development.","PeriodicalId":10282,"journal":{"name":"Classical and Quantum Gravity","volume":"99 1","pages":""},"PeriodicalIF":3.5,"publicationDate":"2026-01-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146006251","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}
Pub Date : 2026-01-21DOI: 10.1088/1361-6382/ae3422
Pooya Saffarieh, Nathan A Holland, Michele Valentini, Jesse van Dongen, Alexandra Mitchell, Sander Sijtsma, Armin Numic, Wouter Hakvoort and Conor Mow-Lowry
We present a multi-scale optimal control framework for active seismic isolation in the Einstein Telescope (ET), a third-generation gravitational-wave observatory. Our approach jointly optimizes feedback and blending filters in a cross-coupled opto-mechanical system using a unified cost function based on an ‘acausal optimum’, that quantifies the sensor signal-to-noise ratios and disturbances versus frequency. This method enables efficient re-optimization under varying sensor configurations and environmental conditions. We apply the framework to two candidate sensing systems using their modeled sensitivity: OmniSens-a six-degree-of-freedom inertial isolation system-and BRS-T360, which combines beam rotation sensor (BRS) as an inertial tilt sensor with T360 as a horizontal seismometer. We demonstrate superior low-frequency isolation with OmniSens, reducing platform motion by up to two orders of magnitude near the microseism. The framework allows for ready optimization and projection of sensor noise to metrics relevant to the performance of the instrument, aiding the design of the ET.
{"title":"Multi-scale optimal control for Einstein Telescope active seismic isolation","authors":"Pooya Saffarieh, Nathan A Holland, Michele Valentini, Jesse van Dongen, Alexandra Mitchell, Sander Sijtsma, Armin Numic, Wouter Hakvoort and Conor Mow-Lowry","doi":"10.1088/1361-6382/ae3422","DOIUrl":"https://doi.org/10.1088/1361-6382/ae3422","url":null,"abstract":"We present a multi-scale optimal control framework for active seismic isolation in the Einstein Telescope (ET), a third-generation gravitational-wave observatory. Our approach jointly optimizes feedback and blending filters in a cross-coupled opto-mechanical system using a unified cost function based on an ‘acausal optimum’, that quantifies the sensor signal-to-noise ratios and disturbances versus frequency. This method enables efficient re-optimization under varying sensor configurations and environmental conditions. We apply the framework to two candidate sensing systems using their modeled sensitivity: OmniSens-a six-degree-of-freedom inertial isolation system-and BRS-T360, which combines beam rotation sensor (BRS) as an inertial tilt sensor with T360 as a horizontal seismometer. We demonstrate superior low-frequency isolation with OmniSens, reducing platform motion by up to two orders of magnitude near the microseism. The framework allows for ready optimization and projection of sensor noise to metrics relevant to the performance of the instrument, aiding the design of the ET.","PeriodicalId":10282,"journal":{"name":"Classical and Quantum Gravity","volume":"16 1","pages":""},"PeriodicalIF":3.5,"publicationDate":"2026-01-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146006250","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}
Pub Date : 2026-01-19DOI: 10.1088/1361-6382/ae3426
Andrew James Bruce
Developments in Carrollian gravity and holography necessitate the use of singular Carroll vector fields, a feature that cannot be accommodated within standard Carrollian geometry. We introduce Carrollian Lie algebroids as a framework to study such singular Carrollian geometries. In this approach, we define the Carroll distribution as the image of the kernel of the degenerate metric under the anchor map, i.e. the map from the Lie algebroid to the tangent bundle of the manifold. The Carroll distribution is, in general, a singular Stefan–Sussmann distribution that will fluctuate between rank-1 and rank-0, and so captures the notion of a singular Carroll vector field. As an example, we show that an invariant Carrollian structure on a principal bundle leads to a Carrollian structure on the associated Atiyah algebroid that will, in general, have a singular Carroll distribution. Mixed null-spacelike hypersurfaces, under some simplifying assumptions, also lead to examples of Carrollian Lie algebroids. Furthermore, we establish the existence of compatible connections on Carrollian Lie algebroids, and as a direct consequence, we conclude that Carrollian manifolds can always be equipped with compatible affine connections.
{"title":"Carrollian Lie algebroids: taming singular Carrollian geometries","authors":"Andrew James Bruce","doi":"10.1088/1361-6382/ae3426","DOIUrl":"https://doi.org/10.1088/1361-6382/ae3426","url":null,"abstract":"Developments in Carrollian gravity and holography necessitate the use of singular Carroll vector fields, a feature that cannot be accommodated within standard Carrollian geometry. We introduce Carrollian Lie algebroids as a framework to study such singular Carrollian geometries. In this approach, we define the Carroll distribution as the image of the kernel of the degenerate metric under the anchor map, i.e. the map from the Lie algebroid to the tangent bundle of the manifold. The Carroll distribution is, in general, a singular Stefan–Sussmann distribution that will fluctuate between rank-1 and rank-0, and so captures the notion of a singular Carroll vector field. As an example, we show that an invariant Carrollian structure on a principal bundle leads to a Carrollian structure on the associated Atiyah algebroid that will, in general, have a singular Carroll distribution. Mixed null-spacelike hypersurfaces, under some simplifying assumptions, also lead to examples of Carrollian Lie algebroids. Furthermore, we establish the existence of compatible connections on Carrollian Lie algebroids, and as a direct consequence, we conclude that Carrollian manifolds can always be equipped with compatible affine connections.","PeriodicalId":10282,"journal":{"name":"Classical and Quantum Gravity","volume":"26 1","pages":""},"PeriodicalIF":3.5,"publicationDate":"2026-01-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145995405","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}
Pub Date : 2026-01-16DOI: 10.1088/1361-6382/ae3424
Pradosh Keshav MV
We develop a stochastic extension of the Wheeler–DeWitt equation in Friedmann–Lemaître–Robertson–Walker (FLRW) minisuperspace and show that quantum backreaction can dynamically regulate the big bang singularity without imposing external boundary conditions. Using Laplace–Beltrami (LB) quantisation and an open-system treatment of coarse-grained graviton modes, we obtain a stochastic Hamiltonian evolution equation in which the diffusion coefficient takes the form . This multiplicative noise vanishes at the origin and renders a = 0 an entrance boundary in Feller’s classification, leading to super-exponential suppression of the LB weighted stationary density and zero probability flux into the singular point. At large scale factor, the global behaviour depends on the cosmological sector: de Sitter and positive potential-dominated regimes exhibit power-law stationary tails, whereas confining potentials or negative effective cosmological constant lead to an entrance boundary at infinity and a globally normalisable steady state. Taken together, these results indicate that stochastic backreaction arising from semiclassical coarse-graining provides a consistent and dynamical mechanism for singularity avoidance in minisuperspace quantum cosmology.
{"title":"Can stochastic clocks in FLRW minisuperspace prevent dynamical singularities?","authors":"Pradosh Keshav MV","doi":"10.1088/1361-6382/ae3424","DOIUrl":"https://doi.org/10.1088/1361-6382/ae3424","url":null,"abstract":"We develop a stochastic extension of the Wheeler–DeWitt equation in Friedmann–Lemaître–Robertson–Walker (FLRW) minisuperspace and show that quantum backreaction can dynamically regulate the big bang singularity without imposing external boundary conditions. Using Laplace–Beltrami (LB) quantisation and an open-system treatment of coarse-grained graviton modes, we obtain a stochastic Hamiltonian evolution equation in which the diffusion coefficient takes the form . This multiplicative noise vanishes at the origin and renders a = 0 an entrance boundary in Feller’s classification, leading to super-exponential suppression of the LB weighted stationary density and zero probability flux into the singular point. At large scale factor, the global behaviour depends on the cosmological sector: de Sitter and positive potential-dominated regimes exhibit power-law stationary tails, whereas confining potentials or negative effective cosmological constant lead to an entrance boundary at infinity and a globally normalisable steady state. Taken together, these results indicate that stochastic backreaction arising from semiclassical coarse-graining provides a consistent and dynamical mechanism for singularity avoidance in minisuperspace quantum cosmology.","PeriodicalId":10282,"journal":{"name":"Classical and Quantum Gravity","volume":"18 1","pages":""},"PeriodicalIF":3.5,"publicationDate":"2026-01-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145972327","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}
Pub Date : 2026-01-14DOI: 10.1088/1361-6382/ae30c7
Thomas Chehab, Olivier Minazzoli and Aurélien Hees
Entangled Relativity is a recent non-linear reformulation of General Relativity that does not include Planck’s constant or Newton’s gravitational constant G in its fundamental structure. One of its key predictions is that emerges as a dynamical field, potentially varying across space and time. In this study, we estimate the magnitude of such variations in three different astrophysical environments: the weak gravitational fields of the Sun and Earth, the intermediate regime of white dwarfs, and the strong fields found in neutron stars. In the Solar System, the relative change in is minimal, reaching at most . In white dwarfs, depending on central density, variations range from to . For neutron stars, the variation can be as high as 1.5% at the surface relative to a remote observer, and up to 5.7% at the center. These results suggest that, if Entangled Relativity accurately describes gravity, spatial variations of Planck’s constant could become an observable signature, particularly in the context of dense stellar objects.
{"title":"Variation of Planck’s quantum of action in Entangled Relativity","authors":"Thomas Chehab, Olivier Minazzoli and Aurélien Hees","doi":"10.1088/1361-6382/ae30c7","DOIUrl":"https://doi.org/10.1088/1361-6382/ae30c7","url":null,"abstract":"Entangled Relativity is a recent non-linear reformulation of General Relativity that does not include Planck’s constant or Newton’s gravitational constant G in its fundamental structure. One of its key predictions is that emerges as a dynamical field, potentially varying across space and time. In this study, we estimate the magnitude of such variations in three different astrophysical environments: the weak gravitational fields of the Sun and Earth, the intermediate regime of white dwarfs, and the strong fields found in neutron stars. In the Solar System, the relative change in is minimal, reaching at most . In white dwarfs, depending on central density, variations range from to . For neutron stars, the variation can be as high as 1.5% at the surface relative to a remote observer, and up to 5.7% at the center. These results suggest that, if Entangled Relativity accurately describes gravity, spatial variations of Planck’s constant could become an observable signature, particularly in the context of dense stellar objects.","PeriodicalId":10282,"journal":{"name":"Classical and Quantum Gravity","volume":"709 1","pages":""},"PeriodicalIF":3.5,"publicationDate":"2026-01-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145961998","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}
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