2022
DOI: 10.48550/arxiv.2204.08480
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Probing Quadratic Gravity with the Event Horizon Telescope

Abstract: Quadratic gravity constitutes a prototypical example of a perturbatively renormalizable quantum theory of the gravitational interactions. In this work, we construct the associated phase space of static, spherically symmetric, and asymptotically flat spacetimes. It is found that the Schwarzschild geometry is embedded in a rich solution space comprising horizonless, naked singularities and wormhole solutions. Characteristically, the deformed solutions follow the Schwarzschild solution up outside of the photon sp… Show more

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Cited by 8 publications
(10 citation statements)
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“…The aforementioned findings achieved by including the traceless part of the nonmetricity tensor into the geometrical framework open the door not only to further phenomenological analyses on this sector of the theory (see [56][57][58][59][60][61][62][63][64][65] for a recent list of observational constraints on extended theories of gravity), but also to new studies concerning the stability of the tensor modes displayed by the action (103). Indeed, whereas the stability of the scalar and vector modes of the torsion and nonmetricity tensors has been analysed in detail for quadratic MAG models [66][67][68][69][70], a thorough study concerning the behaviour of the tensor parts is yet to be performed.…”
Section: Discussionmentioning
confidence: 99%
“…The aforementioned findings achieved by including the traceless part of the nonmetricity tensor into the geometrical framework open the door not only to further phenomenological analyses on this sector of the theory (see [56][57][58][59][60][61][62][63][64][65] for a recent list of observational constraints on extended theories of gravity), but also to new studies concerning the stability of the tensor modes displayed by the action (103). Indeed, whereas the stability of the scalar and vector modes of the torsion and nonmetricity tensors has been analysed in detail for quadratic MAG models [66][67][68][69][70], a thorough study concerning the behaviour of the tensor parts is yet to be performed.…”
Section: Discussionmentioning
confidence: 99%
“…While EHT observations may be successfully reproduced with a Kerr black hole supplied within general relativistic magnetic-hydrodynamical (GRMHD) simulations of the accretion flow [35], many works in the literature have sought for modifications to GR canonical black holes via addition of new fields [36][37][38][39][40][41][42] and hairy black holes [43,44], horizonless compact objects such as naked singularities [45,46], black bounces [47][48][49], boson stars [50][51][52][53][54], thin-shell [55] rotating [56] and asymmetric wormholes [57,58] and other objects [9,59]. Images of modified black holes beyond GR have been also considered: Gauss-Bonnet [60], asymptotic safety [61], noncommutative geometry [62], Einstein-AEther [63], Horndeski theory [64,65], quadratic gravity [66], or braneworlds [67], to mention a few.…”
Section: Shadow and Photon Ring Observationsmentioning
confidence: 99%
“…Such photon rings are a trademark of a given geometry, thus potentially harbouring a way to make robust tests of the Kerr hypothesis [30][31][32][33]. While EHT observations may be successfully reproduced with a Kerr black hole supplied within General Relativistic Magnetic-Hydrodynamical (GRMHD) simulations of an accretion disk model [34], many works in the literature have sought for modifications to GR canonical black holes via addition of new fields [35][36][37][38][39] and hairy black holes [40,41], horizonless compact objects such as naked singularities [42,43], black bounces [44,45], boson stars [46][47][48][49], rotating [50] and asymmetric wormholes [51,52], as well as modified black holes beyond GR within Gauss-Bonnet [53], asymptotic safety [54], noncommutative geometry [55], Einstein-AEther [56], Horndeski theory [57,58], quadratic gravity [59], or braneworlds [60], to mention a few.…”
Section: Shadow and Photon Ring Observationsmentioning
confidence: 99%