Symmetry in Gravitational Physics and Black Holes

A special issue of Symmetry (ISSN 2073-8994). This special issue belongs to the section "Physics".

Deadline for manuscript submissions: 31 March 2027 | Viewed by 526

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Departamento de Física, Universidade Federal da Paraíba, Caixa Postal 5008, João Pessoa 58051-970, PB, Brazil
Interests: Lorentz violation; classical and quantum aspects of black holes; gravitation; modified theories of gravity; cosmology; thermodynamics
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Special Issue Information

Dear Colleagues,

Gravitational physics remains one of the central areas of modern theoretical and observational research. Black holes, in particular, provide a privileged arena for testing gravity in the strong-field regime, connecting classical general relativity, quantum effects, astrophysics, cosmology, and high-energy physics. Recent progress in gravitational-wave astronomy, black hole imaging, precision cosmology, and studies of compact objects has opened new possibilities for examining the structure of spacetime and confronting theoretical models with data.

This Special Issue aims to gather original research articles and review papers devoted to recent developments in gravitational physics, with an emphasis on black holes and related compact objects. Topics of interest include exact and numerical black hole solutions, modified theories of gravity, quasinormal modes, gravitational-wave signatures, shadows and photon rings, geodesic structures, accretion phenomena, lensing, thermodynamics, Hawking radiation, quantum aspects of black holes, wormholes, exotic compact objects, and observational tests of strong gravity.

Submissions addressing formal aspects, phenomenology, and connections with current or future observational facilities are especially welcome. This Special Issue seeks to provide a focused collection of contributions that reflect current directions and open problems in gravitational physics and black hole research.

Dr. Adailton A. Araújo Filho
Guest Editor

Manuscript Submission Information

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Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-anonymized peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Symmetry is an international peer-reviewed open access monthly journal published by MDPI.

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Keywords

  • black holes
  • gravitational physics
  • modified gravity
  • gravitational waves
  • quasinormal modes
  • black hole thermodynamics
  • gravitational lensing
  • black hole shadows
  • compact objects
  • strong-field gravity

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Published Papers (1 paper)

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Research

28 pages, 795 KB  
Article
Bayesian Evidence for Angular Symmetry and Spectral Curvature in the Nanohertz Gravitational-Wave Background
by Hua Xu, Weiming Zhang and Yike Guo
Symmetry 2026, 18(7), 1169; https://doi.org/10.3390/sym18071169 - 10 Jul 2026
Viewed by 185
Abstract
Pulsar timing arrays have detected a nanohertz signal exhibiting the Hellings–Downs angular correlation, the expected angular symmetry of an isotropic stochastic gravitational-wave background. This angular symmetry fixes the tensor correlation class of the signal, so its physical origin must be inferred from the [...] Read more.
Pulsar timing arrays have detected a nanohertz signal exhibiting the Hellings–Downs angular correlation, the expected angular symmetry of an isotropic stochastic gravitational-wave background. This angular symmetry fixes the tensor correlation class of the signal, so its physical origin must be inferred from the frequency spectrum. Using the public NANOGrav 15-year free-spectrum products, we compare five spectral hypotheses through Bayesian evidence: the canonical scale-free power law from purely gravitational-wave-driven supermassive black hole binaries (SMBHBs), a free-slope power law, an environmental SMBHB turnover model, a first-order phase transition template, and an effective cosmic string spectrum. The evidence favors spectra with physical curvature or a characteristic scale, while the strict scale-free SMBHB law is strongly disfavored. Within the tested physical templates, the phase transition model gives the largest compressed spectral evidence; within astrophysical source models, environmental SMBHB hardening is the leading interpretation and links the spectral bend to parsec-scale nuclear stellar densities. The effective cosmic string spectrum shows little evidence gain under the baseline prior. An orbit- and foreground-aware LISA continuation forecast gives this ranking a multi-band check: the PTA-selected QCD-scale phase transition posterior has no appreciable millihertz continuation, whereas an unchanged broad cosmic string extrapolation is LISA-bright and needs additional spectral structure. Full article
(This article belongs to the Special Issue Symmetry in Gravitational Physics and Black Holes)
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