Novel Einstein–scalar-Gauss-Bonnet wormholes without exotic matter

Antoniou, Georgios; Bakopoulos, Athanasios; Kanti, Panagiota; Kleihaus, Burkhard; Kunz, Jutta

doi:10.1103/physrevd.101.024033

Cited by 83 publications

(95 citation statements)

References 58 publications

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“…In fact, different setups have been constructed to evade the no-hair theorem [6]. Recent studies suggest that BHs, as sources of extreme gravity, can possess soft quantum hair [7]. However, the derivation of new solutions representing BHs is hindered by the non-linearity as well as high degree of freedom in the field equations.…”

Section: Introductionmentioning

confidence: 99%

Extended gravitational decoupled solutions in self-interacting Brans–Dicke theory

Sharif

Majid

2020

Physics of the Dark Universe

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In this paper, we formulate black hole solutions through extended gravitational decoupling scheme in the framework of self-interacting Brans-Dicke theory. The addition of a new source in the matter distribution increases the degrees of freedom in the system of field equations. Transformations in radial as well as temporal metric functions split the system into two arrays. Each array includes the effects of only one source (either seed or additional). The seed source is assumed to be a vacuum and the corresponding system is specified through the Schwarzschild metric. In order to construct a suitable solution of the second system, constraints are applied on the metric potentials and energy-momentum tensor of the additional source. We obtain three solutions corresponding to different values of the decoupling parameter in the presence of a massive scalar field. The extra source is classified as normal or exotic through energy conditions. It is found that two solutions agree with the energy bounds and thus have normal matter as their source.

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Section: Introductionmentioning

confidence: 99%

Extended gravitational decoupled solutions in self-interacting Brans–Dicke theory

Sharif

Majid

2020

Physics of the Dark Universe

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“…On the other hand, if a traversable wormhole can be obtained from a more classical or semiclassical construction, it may indicate that the original proposal of the ER = EPR conjecture may be inconsistent or that the proposal should be restricted. In order to do this, the violation of the averaged null energy condition would be required [87], which would be possible if one did not consider the expectation value of the energy-momentum tensor of the entire histories [85] (i.e., if one would consider only a specific non-perturbative process [84,[88][89][90]) or if the theory would violate causality somewhat due to modifications of gravity (e.g., [35][36][37][38][39][40][41][42][43][44][45]).…”

Section: Discussionmentioning

confidence: 99%

“…We note that the violation of the NEC also implies the violation of the weak and strong energy conditions. Since the wormhole spacetime is spherically symmetric, there are two choices of null vector [44],…”

Section: Null Energy Condition (Nec)mentioning

confidence: 99%

“…However, the presence of a phantom field is not mandatory to obtain traversable wormholes. Numerous such wormholes have been obtained in alternative theories of gravity, when the energy conditions have been violated in the gravitational sector (see, e.g., [35][36][37][38][39][40][41][42][43][44][45]). But even in GR, wormholes can be supported only by fermions [46], i.e., the constituents of ordinary matter, which is also sufficient to violate the energy conditions.…”

Section: Introductionmentioning

confidence: 99%

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Ellis wormholes in anti-de Sitter space

et al. 2021

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We construct traversable wormholes with anti-de Sitter asymptotics supported by a phantom field. These wormholes are massless and symmetric with respect to reflection of the radial coordinate $$\eta \rightarrow - \eta $$ η → - η . Their circumferential radius decreases monotonically from radial infinity to their single throat. Analogous to their asymptotically flat counterparts, these anti-de Sitter wormholes possess an unstable radial mode.

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“…The connecting and traveling characteristics of wormholes attract the theoretical research community and from the last few decades many researchers have intensively studied various aspects of traversable wormholes within Einstein gravity as well as in different theories of modified gravity [3,. Further, in the last year, more different wormhole like geometries are found in the bumblebee gravity [56], Einstein-Cartan Garvity [57], exponential f (R, T ) gravity [58], modified gravity with ρ(R, R ) matter [59] and Novel Einstein-scalar-Gauss-Bonnet gravity [60].…”

Section: Introductionmentioning

confidence: 99%

Traversable wormholes in the bulge of Milky Way galaxy with Global Monopole Charge

Sarkar

Rahaman

2020

Eur. Phys. J. C

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The present work looks for the existence of completely new wormhole geometries in the bulge of the Milky Way galaxy (MWG) situated on the dark matter (DM) density profile followed from MacMillan (MNRAS 76:465, 2017) and Boshkayev and Malafarina (MNRAS 484:3325, 2019) concerned with Global Monopole Charge. The obtained shape function is positively increasing against the radial coordinate and it increases faster with the increasing values of Global Monopole Charge. Moreover, the reported shape function satisfies all the essential criterions and hence it constructs wormhole geometry in the bulge of the MWG. Further, the DM candidate around bulge is suitable to harbor wormhole by violating the null energy condition(NEC) corresponding to three different redshift functions. The striking point of our solution is that for zero Global Monopole Charge the wormholes are asymptotically flat corresponding to the first two choices of redshift functions while for positive values of Global Monopole Charge wormhole becomes non asymptotically flat and Global Monopole Charge also has the crucial effect on the violation of NEC. In our solutions, one can note that the total amount of averaged NEC violating matter in the wormhole spacetime depends on the Global Monopole Charge $$\eta $$ η . Furthermore, the respective wormhole solutions are in equilibrium positions.

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Novel Einstein–scalar-Gauss-Bonnet wormholes without exotic matter

Cited by 83 publications

References 58 publications

Extended gravitational decoupled solutions in self-interacting Brans–Dicke theory

Extended gravitational decoupled solutions in self-interacting Brans–Dicke theory

Ellis wormholes in anti-de Sitter space

Traversable wormholes in the bulge of Milky Way galaxy with Global Monopole Charge

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