Gravitational flux tubes

Dzhunushaliev, Vladimir; Kasper, U.; Singleton, Douglas

doi:10.1016/s0370-2693(00)00328-2

Cited by 10 publications

(24 citation statements)

References 12 publications

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“…Thus, keeping both Q = 0 = C and a non-zero dilaton gives us an asymptotically non-flat black hole model. The case C = 0 (without dilaton), yields a metric which is analogous to the BR metric [17][18][19].…”

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confidence: 99%

N-dimensional non-abelian dilatonic, stable black holes and their Born–Infeld extension

2009

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We find large classes of non-asymptotically flat Einstein-Yang-MillsDilaton and Einstein-Yang-Mills-Born-Infeld-Dilaton black holes in N-dimensional spherically symmetric spacetime expressed in terms of the quasilocal mass. Extension of the dilatonic YM solution to N-dimensions has been possible by employing the generalized Wu-Yang ansatz. Another metric ansatz, which aided in finding exact solutions is the functional dependence of the radius function on the dilaton field. These classes of black holes are stable against linear radial perturbations. In the limit of vanishing dilaton we obtain Bertotti-Robinson type metrics with the topology of Ad S 2 ×S N −2 . Since connection can be established between dilaton and a scalar field of Brans-Dicke type we obtain black hole solutions also in the Brans-Dicke-Yang-Mills theory as well.

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confidence: 99%

N-dimensional non-abelian dilatonic, stable black holes and their Born–Infeld extension

2009

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“…The constructions considered in the present paper can be also relevant for higherdimensional generalization of BR-like solutions [23]. In particular, it concerns the issue of compactification of extra-dimensions in Kaluza-Klein theories where flux tubes of constant cross-sections can arise as compactified BR-like phase inside an uncompactified one [24], [25].…”

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confidence: 99%

N-spheres in general relativity: Regular black holes without apparent horizons, static wormholes with event horizons and gravastars with a tube-like core

Заславский¹

2006

Physics Letters B

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We consider a way to avoid black hole singularities by gluing a black hole exterior to an interior with a tube-like geometry consisting of a direct product of two-dimensional AdS, dS, or Rindler spacetime with a two-sphere of constant radius. As a result we obtain a spacetime with either "cosmological" or "acceleration" (event) horizons but without an apparent horizon. The inner region is everywhere regular and supported by matter with the vacuum-like equation of state p r + ρ = 0 where p r = T r r is the longitudinal pressure, ρ = −T 0 0 is the energy density, T ν µ is the stress-energy tensor. When the surface of gluing approaches the horizon, surface stresses vanish, while p r may acquire a finite jump on the boundary. Such composite spacetimes accumulate an infinitely large amount of matter inside the horizon but reveal themselves for an external observer as a sphere of a finite ADM mass and size.If the throat of the inner region is glued to two black hole exteriors, one obtains a wormhole of an arbitrarily large length. Wormholes under discussion are static but not traversable, so the null energy condition is not violated. In particular, they include the case with an infinite proper distance to the throat. We construct also gravastars with an infinite tube as a core and traversable wormholes connected by a finite tube-like region.

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“…33 The gauge fields that go from one side of the wormhole to the other can be used to construct wormhole throats which can be very, very long. [34][35][36][37][38] Then it so happens that these very long wormhole throats have a dynamics that mimic that of string theory, [35][36][37][38] which raises the interesting question of whether wormhole theory and in particular child universe theory could be the origin of string theory, which could appear as the effective description of the dynamics of these long wormhole throats.…”

Section: Child Universes Wormholes and Stringsmentioning

confidence: 99%

Wormholes and Child Universes

Guendelman

2010

Int. J. Mod. Phys. D

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Evidence to the case that classical gravitation provides the clue to make sense out of quantum gravity is presented. The key observation is the existence in classical gravitation of child universe solutions or "almost" solutions , "almost" because of some singularity problems. The difficulties of these child universe solutions due to their generic singularity problems will be very likely be cured by quantum effects, just like for example "almost" instanton solutions are made relevant in gauge theories with breaking of conformal invariance. Some well motivated modifcations of General Relativity where these singularity problems are absent even at the classical level are discussed. High energy density excitations, responsible for UV divergences in quantum field theories, including quantum gravity, are likely to be the source of child universes which carry them out of the original space time. This decoupling could prevent these high UV excitations from having any influence on physical amplitudes. Child universe production could therefore be responsible for UV regularization in quantum field theories which take into account semiclassically gravitational effects. Child universe production in the last stages of black hole evaporation, the prediction of absence of tranplanckian primordial perturbations, connection to the minimum length hypothesis and in particular the connection to the maximal curvature hypothesis are discussed. Some discussion of superexcited states in the case these states are Kaluza Klein excitations is carried out. Finally, the posibility of obtaining "string like" effects from the wormholes associated with the child universes is discussed.

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Gravitational flux tubes

Cited by 10 publications

References 12 publications

N-dimensional non-abelian dilatonic, stable black holes and their Born–Infeld extension

N-dimensional non-abelian dilatonic, stable black holes and their Born–Infeld extension

N-spheres in general relativity: Regular black holes without apparent horizons, static wormholes with event horizons and gravastars with a tube-like core

Wormholes and Child Universes

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