Conformally symmetric traversable wormholes in modified teleparallel gravity

Singh, Ksh. Newton; Banerjee, Ayan; Rahaman, Farook; Jasim, M. K.

doi:10.1103/physrevd.101.084012

Cited by 41 publications

(11 citation statements)

References 96 publications

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“…However, this difficulty can go away if we frame wormholes within the context of modified gravity, where the existence of additional gravitational corrections, understood as a kind of matter fluid, are able to restore geodesic completeness without unavoidably violating the energy conditions, see e.g. [45][46][47][48][49][50][51][52][53][54].…”

Section: Introductionmentioning

confidence: 99%

Double shadows of reflection-asymmetric wormholes supported by positive energy thin-shells

Guerrero,

Olmo,

Rubiera-Garcia

2021

Preprint

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We consider reflection-asymmetric thin-shell wormholes within Palatini f (R) gravity using a matching procedure of two patches of electrovacuum space-times at a hypersurface (the shell) via suitable junction conditions. The conditions for having (linearly) stable wormholes supported by positive-energy matter sources are determined. We also identify some subsets of parameters able to locate the shell radius above the event horizon (when present) but below the photon sphere (on both sides). We illustrate with an specific example that such two photon spheres allow an observer on one of the sides of the wormhole to see another (circular) shadow in addition to the one generated by its own photon sphere, which is due to the photons passing above the maximum of the effective potential on its side and bouncing back across the throat due to a higher effective potential on the other side. We finally comment on the capability of these double shadows to seek for traces of new gravitational physics beyond that described by General Relativity.

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Section: Introductionmentioning

confidence: 99%

Double shadows of reflection-asymmetric wormholes supported by positive energy thin-shells

Guerrero,

Olmo,

Rubiera-Garcia

2021

Preprint

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“…It is noteworthy that the pressure p in ref. [90] has a negative value that is inconsistent with plausible stellar models. Our present model is consistent, as pressure is positive inside the configuration.…”

Section: Discussionmentioning

confidence: 99%

Existence of Dark Energy Stars within Lower Mass Gap in the Realm of f(Q)$f(Q)$ Gravity

Bhar

2023

Fortschritte der Physik

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The object of this article is to study a new class of dark energy stars in the background of gravity by using the metric potentials proposed by Krori‐Barua [J. Phys. A, Math. Gen. 8:508 (1975)]. To achieve the goal, a quadratic form of as is taken into account for the static spherically symmetric spacetime,`a' being a coupling parameter of gravity. The maximum allowable masses with corresponding radii have been obtained via plots for and 8. The obtained maximum masses from our analysis are found in the range . For a smaller value of the coupling parameter ‘a’ associated with gravity, more massive stars are found. The radii corresponding to the maximum masses also increase with decreasing ‘a’. In particular, when , the theory can achieve a dark energy star of mass for certain specific combinations of model parameters. This obtained mass is located within a mass in the range of and that can be a lighter object in the GW190814 event detected by LIGO/VIRGO experiments.

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“…For the choice of

P_{t} = m P_{r}

and

P_{r} = w ρ

, the differential equations in ()‐() becomes highly non‐linear and very complicated to solve and analyze these types of systems (see Ref. [35]). Therefore, we consider two different specific shape functions in finding wormhole solutions.…”

Section: Wormhole Models With Non‐linear F(q)mentioning

confidence: 99%

Traversable Wormhole Geometries in Gravity

Hassan

Mandal

Sahoo

2021

Fortschritte der Physik

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The current interests in the universe motivate us to go beyond Einstein's General theory of relativity. One of the interesting proposals comes from a new class of teleparallel gravity named symmetric teleparallel gravity, i.e., f(Q) gravity, where the non‐metricity term Q is accountable for fundamental interaction. These alternative modified theories of gravity's vital role are to deal with the recent interests and to present a realistic cosmological model. This manuscript's main objective is to study the traversable wormhole geometries in f(Q) gravity. We construct the wormhole geometries for three cases: (i) by assuming a relation between the radial and lateral pressure, (ii) considering phantom energy equation of state (EoS), and (iii) for a specific shape function in the fundamental interaction of gravity (i.e. for linear form of f(Q)). Besides, we discuss two wormhole geometries for a general case of f(Q) with two specific shape functions. Then, we discuss the viability of shape functions and the stability analysis of the wormhole solutions for each case. We have found that the null energy condition (NEC) violates each wormhole model which concluded that our outcomes are realistic and stable. Finally, we discuss the embedding diagrams and volume integral quantifier to have a complete view of wormhole geometries.

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Conformally symmetric traversable wormholes in modified teleparallel gravity

Cited by 41 publications

References 96 publications

Double shadows of reflection-asymmetric wormholes supported by positive energy thin-shells

Double shadows of reflection-asymmetric wormholes supported by positive energy thin-shells

Existence of Dark Energy Stars within Lower Mass Gap in the Realm of f(Q)$f(Q)$ Gravity

Traversable Wormhole Geometries in Gravity

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