Einstein–Yang–Mills AdS black brane solution in massive gravity and viscosity bound

Sadeghi, Mehdi

doi:10.1140/epjc/s10052-018-6360-5

Cited by 23 publications

(16 citation statements)

References 45 publications

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“…There is a conjecture that states η s = 1 4π for Einstein-Hilbert gravity, known as KSS bound [33] which it is violated for higher derivative gravity [33,34,35,36,37]. Our result shows massive gravity with a cloud of string behaves effectively like higher derivative gravity [38]. Our outcome also shows that a cloud of strings acts like a charge comparison to [38,39] results.…”

Section: Resultssupporting

confidence: 58%

Does a cloud of strings affect shear viscosity bound?

Sadeghi

Ranjbari

2019

Class. Quantum Grav.

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The Einstein AdS black brane with a cloud of strings background in context of massive gravity is introduced. There is a momentum dissipation on the boundary because of graviton mass on the bulk. The ratio of shear viscosity to entropy density is calculated for this solution. This value violates the KSS bound if we apply the Dirichlet boundary and regularity on the horizon conditions. Our result shows that this value is independent of the cloud of strings.

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Section: Resultssupporting

confidence: 58%

Does a cloud of strings affect shear viscosity bound?

Sadeghi

Ranjbari

2019

Class. Quantum Grav.

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“…For related works on Einstein-Yang-Mills black holes see[7][8][9][10][11][12][13][14][15][16][17][18][19][20][21][22] and references therein.…”

mentioning

confidence: 99%

Meronic Einstein-Yang-Mills black hole in 5D and gravitational spin from isospin effect

Canfora

Gomberoff

et al. 2019

J. High Energ. Phys.

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We construct an analytic black hole solution in SU(2) Einstein-Yang-Mills theory in five dimensions supporting a Meron field. The gauge field is proportional to a pure gauge and has a non-trivial topological charge. The would-be singularity at the Meron core gets shielded from the exterior by the black hole horizon. The metric has only one integration constant, namely, its ADM mass, which is shown to be finite once an appropriate boundary term is added to the action. The thermodynamics is also worked out, and a first-order phase transition, similar to the one occurring in the Reissner-Nordström case is identified. We also show that the solution produces a spin from isospin effect , i.e., even though the theory is constructed out of bosons only, the combined system of a scalar field and this background may become fermionic. More specifically, we study scalar excitations in this purely bosonic background and find that the system describes fermionic degrees of freedom at spatial infinity. Finally, for the asymptotically AdS 5 case, we study its consequences in the context of the AdS/CFT correspondence.

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“…where R, Λ and F a µν are the Ricci scalar, cosmological constant and SO(5, 1) Yang-Mills gauge field tensor, respectively [19,32]. Here, F a µν is defined as…”

Section: Perturbative Einstein-yang-mills Ads Black Brane In Massive ...mentioning

confidence: 99%

“…Such studies motivated us to look at these universal relationships from a new perspective, which led to exciting developments. Here, we consider different structures of the black brane, in particular, solution in Rastall AdS massive gravity [18], Einstein-Yang-Mills AdS black brane solution in massive gravity [19], and general anisotropic black brane in Horava-Lifshitz gravity [20]. Then, we try to examine a different form of these universal relations.…”

Section: Introductionmentioning

confidence: 99%

Weak Gravity Conjecture, Black Branes and Violations of Universal Thermodynamic Relation

Sadeghi¹,

Pourhassan²,

Gashti³

et al. 2022

Preprint

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The universal thermodynamic relations between corrections to entropy and extremality for various black holes solutions have been studied. In this regard, we hereby consider a number of different black brane solutions in different structures for perturbative corrections to general relativity. These are, namely, black brane solution in Rastall AdS massive gravity, Einstein-Yang-Mills AdS black brane solution in massive gravity and general anisotropic black brane in Horava-Lifshitz gravity. We calculate both the entropy and extremality bound by introducing a small constant correction to the action. Remarkably, we find that black brane violates the universal thermodynamic relations. In other words, a universal relation between corrections to entropy and extremality are not valid in the black brane structure.

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Einstein–Yang–Mills AdS black brane solution in massive gravity and viscosity bound

Abstract: We introduce the Einstein-Yang-Mills AdS black brane solution in context of massive gravity. The ratio of shear viscosity to entropy density is calculated for this solution. This value violates the KSS bound if we apply the Dirichlet boundary and regularity on the horizon conditions.

Cited by 23 publications

References 45 publications

Does a cloud of strings affect shear viscosity bound?

Does a cloud of strings affect shear viscosity bound?

Meronic Einstein-Yang-Mills black hole in 5D and gravitational spin from isospin effect

Weak Gravity Conjecture, Black Branes and Violations of Universal Thermodynamic Relation

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