A class of static spherically symmetric solutions in f(Q)-gravity

Calzà, Marco; Sebastiani, Lorenzo

doi:10.1140/epjc/s10052-023-11393-2

Cited by 27 publications

(4 citation statements)

References 129 publications

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“…Static spherically symmetric within teleparallel f (T) gravity and non-metricity (symmetric teleparallel) f (Q) gravity have been obtained in recent years, see e.g. [1567][1568][1569][1570][1571][1572][1573][1574][1575][1576]: we defer a dedicated study of torsion and non-metricity constraints from BH shadows to a follow-up work. Other solutions it would be interesting to study include those of [1577][1578][1579][1580].…”

Section: Acknowledgmentsmentioning

confidence: 99%

Horizon-scale tests of gravity theories and fundamental physics from the Event Horizon Telescope image of Sagittarius A ∗

Vagnozzi

Roy

Tsai

et al. 2023

Class. Quantum Grav.

210

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Horizon-scale images of black holes (BHs) and their shadows have opened an unprecedented window onto tests of gravity and fundamental physics in the strong-field regime. We consider a wide range of well-motivated deviations from classical General Relativity (GR) BH solutions, and constrain them using the Event Horizon Telescope (EHT) observations of Sagittarius A* (Sgr A*), connecting the size of the bright ring of emission to that of the underlying BH shadow and exploiting high-precision measurements of Sgr A*’s mass-to-distance ratio. The scenarios we consider, and whose fundamental parameters we constrain, include various regular BHs, string-inspired space-times, violations of the no-hair theorem driven by additional fields, alternative theories of gravity, novel fundamental physics frameworks, and BH mimickers including well-motivated wormhole and naked singularity space-times. We demonstrate that the EHT image of Sgr A* places particularly stringent constraints on models predicting a shadow size larger than that of a Schwarzschild BH of a given mass, with the resulting limits in some cases surpassing cosmological ones. Our results are among the first tests of fundamental physics from the shadow of Sgr A* and, while the latter appears to be in excellent agreement with the predictions of GR, we have shown that a number of well-motivated alternative scenarios, including BH mimickers, are far from being ruled out at present.

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Section: Acknowledgmentsmentioning

confidence: 99%

Horizon-scale tests of gravity theories and fundamental physics from the Event Horizon Telescope image of Sagittarius A ∗

Vagnozzi

Roy

Tsai

et al. 2023

Class. Quantum Grav.

210

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“…dr , and going forward, we will use the following abbreviation S, S 1 , S ′ , and S ′ 1 . Ultimately, based on the best agreement with cosmological evidence, [49,60] the power-law of f (Q) theory is the one we analyze in the following…”

Section: Solution Of Anti-de-sitter Black Holementioning

confidence: 99%

“…[4,5,15,16,[20][21][22][23][24][25][26][27] These theories have been extensively studied in the context of modified gravity. By introducing new degrees of freedom (DOF) through torsion or non-metricity, a range of fascinating phenomena has been revealed, especially in cosmological models, [28][29][30][31][32][33][34][35][36][37][38][39][40][41][42][43][44][45] studies have explored solutions related to black holes, [10,[46][47][48][49] as well as gravitational waves. [50][51][52][53] In ref.…”

Section: Introductionmentioning

confidence: 99%

Maxwell‐f(Q)$f(Q)$ Theory

Nashed

2024

Fortschritte der Physik

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Exploring the four‐dimensional AdS black hole is crucial within the framework of the AdS/CFT correspondence. In this research, four‐dimensional stationary and rotating AdS solutions in the framework of the gravitational theory are investigated, considering the charged scenario. Author's emphasis is on the power‐law ansatz, which consistent with observations and is deemed the most viable. Because this solution does not have an uncharged version or relate to general relativity, it falls into a new category, which derives its features from changes in non‐metricity and incorporates the Maxwell domain. The singularities of such a solution are analyzed, computing all the quantities of different curvature and non‐metricity invariants. Author's results indicate the presence of a central singularity, albeit with a softer nature compared to standard non‐metricity or Einstein general relativity, attributed to the influence of the effect of . Several physical characteristics of black hole from thermodynamics perspective and demonstrate the existence of an outer event horizon in addition to the inner Cauchy horizons are examined. However, under the conditions of sufficiently large electric charge, a naked singularity emerges. Finally, a class of rotating black hole in four‐dimensional gravity that are asymptotically anti‐de Sitter charged is derived.

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“…There have been various studies regarding wormholes in f (Q) gravity [7,8]. Calza and Sebastiani [9] scrutinized various aspects of static and spherically symmetric solutions in f (Q) gravity.…”

Section: Introductionmentioning

confidence: 99%

Massless Dirac perturbations of black holes in f(Q) gravity: quasinormal modes and a weak deflection angle

Al-Badawi,

Kumar Jha

2024

Commun. Theor. Phys.

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This article consider a static and spherical black hole (BH) in f(Q) gravity. f(Q) gravity is the extension of symmetric teleparallel general relativity, where both curvature and torsion are vanishing, and gravity is described by nonmetricity. In this study, we investigate the possible implications of quasinormal modes (QNM) modified Hawking spectra, and deflection angles generated by the model. The WKB method is used to solve the equations of motion for massless Dirac perturbation fields and explore the impact of the nonmetricity parameter ($Q_{0}$). Based on the QNMs computation, we can ensure that the BH is stable against massless Dirac perturbations and as $Q_{0}$ increases the the oscillatory frequency of the mode decrease. We then discuss the weak deflection angle in theweak field limit approximation. We compute the deflection angle up to the fourth order of approximation and show how the nonmetricity parameter affects it. We find that the $Q_{0}$ parameter reduces the deflection angle.

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A class of static spherically symmetric solutions in f(Q)-gravity

Cited by 27 publications

References 129 publications

Horizon-scale tests of gravity theories and fundamental physics from the Event Horizon Telescope image of Sagittarius A ∗

Horizon-scale tests of gravity theories and fundamental physics from the Event Horizon Telescope image of Sagittarius A ∗

Maxwell‐f(Q)$f(Q)$ Theory

Massless Dirac perturbations of black holes in f(Q) gravity: quasinormal modes and a weak deflection angle

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