Black hole with primary scalar hair in Einstein-Weyl-Maxwell conformal scalar theory

Zou, De-Cheng; Myung, Yun Soo

doi:10.1103/physrevd.101.084021

Cited by 13 publications

(8 citation statements)

References 27 publications

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“…BH solutions within this theory have been obtained by Astorino [289] (see also Refs. [290][291][292][293][294][295][296][297] for BH and black brane solutions within related models), and contain a hair parameter S which is related to the scalar field pro-file (and is directly connected to the value of the scalar field at the horizon). The hair parameter, or scalar charge, emerges as an integration constant and describes primary hair, i.e.…”

Section: Morris-thorne Traversable Wormholementioning

confidence: 99%

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

Vagnozzi¹,

Roy²,

Tsai³

et al. 2022

Preprint

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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, allowing us to test whether the Kerr metric provides a good description of the space-time in the vicinity of the event horizons of supermassive BHs. We consider a wide range of well-motivated deviations from classical General Relativity solutions, and constrain them using the Event Horizon Telescope (EHT) observations of Sagittarius A * (SgrA * ), connecting the size of the bright ring of emission to that of the underlying BH shadow and exploiting high-precision measurements of SgrA * 's mass-to-distance ratio. The scenarios we consider, and whose fundamental parameters we constrain, include various regular BH models, string-and non-linear electrodynamics-inspired space-times, scalar field-driven violations of the no-hair theorem, alternative theories of gravity, new ingredients such as the generalized uncertainty principle and Barrow entropy, and BH mimickers including examples of wormholes and naked singularities. We demonstrate that SgrA * 's image places particularly stringent constraints on models predicting a shadow size which is larger than that of a Schwarzschild BH of a given mass: for instance, in the case of Barrow entropy we derive constraints which are significantly tighter than the cosmological ones. Our results are among the first tests of fundamental physics from the shadow of SgrA * and, while the latter appears to be in excellent agreement with the predictions of General Relativity, we have shown that various well-motivated alternative scenarios (including BH mimickers) are far from being ruled out at present.

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Section: Morris-thorne Traversable Wormholementioning

confidence: 99%

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

Vagnozzi¹,

Roy²,

Tsai³

et al. 2022

Preprint

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show abstract

“…However, as noted earlier in [184,185], things simplify considerably on-shell. While T (M) µν is traceless (i.e.…”

Section: Shadows Of Minimally-coupled Charged Black Holes With Scalar...mentioning

confidence: 70%

“…Black hole or black brane solutions in similar models have been studied earlier in e.g. [179][180][181][182][183][184][185]. The gravitational field equations associated to the action in Eq.…”

Section: Shadows Of Minimally-coupled Charged Black Holes With Scalar...mentioning

confidence: 88%

Black holes with scalar hair in light of the Event Horizon Telescope

Khodadi,

Allahyari,

Vagnozzi

et al. 2020

Preprint

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Searching for violations of the no-hair theorem (NHT) is a powerful way to test gravity, and more generally fundamental physics, particularly with regards to the existence of additional scalar fields. The first observation of a black hole (BH) shadow by the Event Horizon Telescope (EHT) has opened a new direct window onto tests of gravity in the strongfield regime, including probes of violations of the NHT. We consider two scenarios described by the Einstein-Maxwell equations of General Relativity and electromagnetism, to which we add a scalar field. In the first case we consider a minimally-coupled scalar field with a potential, whereas in the second case the field is conformally-coupled to curvature. In both scenarios we construct charged BH solutions, which are found to carry primary scalar hair. We then compute the shadows cast by these two BHs as a function of their electric charge and scalar hair parameter. Comparing these shadows to the shadow of M87* recently imaged by the EHT collaboration, we set constraints on the amount of scalar hair carried by these two BHs. The conformally-coupled case admits a regime for the hair parameter, compatible with EHT constraints, describing a so-called mutated Reissner-Nordström BH: this solution was recently found to effectively mimic a wormhole. Our work provides novel constraints on fundamental physics, and in particular on violations of the no-hair theorem and the existence of additional scalar fields, from the shadow of M87*.

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“…The equations that arise in the above process have been thoroughly studied in the Schwarzschild spacetime. However, for example, if one considers a non-vacuum static black hole with hair [31][32][33], the metric would be no longer the Schwarzschild spacetime. Especially, when studying the Effective-One-Body problem to general relativistic two-body dynamics, peoples used the static and spherically symmetric effective metric [34,35].…”

Section: Introductionmentioning

confidence: 99%

Gauge Invariant Perturbations of General Spherically Symmetric Spacetimes

Liu,

Fang,

Jing

et al. 2022

Preprint

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Black hole with primary scalar hair in Einstein-Weyl-Maxwell conformal scalar theory

Cited by 13 publications

References 27 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$^*$

Black holes with scalar hair in light of the Event Horizon Telescope

Gauge Invariant Perturbations of General Spherically Symmetric Spacetimes

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