Possible existence of wormholes in the central regions of halos

Rahaman, Farook; Salucci, Paolo; Kuhfittig, Peter K. F.; Ray, Saibal; Rahaman, Mosiur

doi:10.1016/j.aop.2014.08.003

Cited by 63 publications

(47 citation statements)

References 16 publications

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“…Their conclusion that traversable wormholes may exist both at the inner and outer parts of our spiral galaxy has been revised by using a different density distribution. Namely, we adapt the Einasto density profile [12,13] which differs much from the Navarro-Frenk-White (NFW) profile employed in [41,50]. Our analysis suggests accordingly that at the central region since the NEC is not violated, we do not get any traversable wormholes.…”

Section: Discussionmentioning

confidence: 99%

“…[50], which discusses the possible formation/existence of traversable wormholes in our own galaxy, Milky Way. Their conclusion that traversable wormholes may exist both at the inner and outer parts of our spiral galaxy has been revised by using a different density distribution.…”

Section: Discussionmentioning

confidence: 99%

“…Other one is proposed by Rahaman et. al [50] that the observed rotational curve profile in the DM region is given by…”

Section: Traversable Wormholes Under the Einasto Dm Profilementioning

confidence: 99%

“…It is assumed that DM is expressed in the form of general anisotropic energy-momentum tensor [3,50], as follows…”

Section: Traversable Wormholes Under the Einasto Dm Profilementioning

confidence: 99%

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confidence: 99%

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Existence of traversable wormholes in the spherical stellar systems

Овгун

Halilsoy

2016

Astrophys Space Sci

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Potentiality of the presence of traversable wormholes in the outer/inner regions of the halos of galaxies, situated on the Navarro-Frenk-White (NFW) density profile and Universal Rotation Curve (URC) dark matter models have been investigated recently [27][28][29][49][50][51][52]. Since this covers our own galaxy also as a possible home for traversable wormholes it prompts us to further the subject by considering alternative density distributions. From this token herein we make use of the Einasto model [12,13,35] to describe the density profiles for the same purpose. Our choice for the latter is based on the fact that theoretical dark matter halos produced in computer simulations are best described by such a profile. For technical reasons we trim the number of parameters in the Einasto profile to a possible minimum. Based on such a model it is shown that traversable wormholes in the outer regions of spiral galaxies are possible while the inner part regions prohibit such formations.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

“…Other one is proposed by Rahaman et. al [50] that the observed rotational curve profile in the DM region is given by…”

Section: Traversable Wormholes Under the Einasto Dm Profilementioning

confidence: 99%

“…It is assumed that DM is expressed in the form of general anisotropic energy-momentum tensor [3,50], as follows…”

Section: Traversable Wormholes Under the Einasto Dm Profilementioning

confidence: 99%

“…

…”

mentioning

confidence: 99%

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Existence of traversable wormholes in the spherical stellar systems

Овгун

Halilsoy

2016

Astrophys Space Sci

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Possibility of the Traversable Wormholes in the Galactic Halos within 4D Einstein–Gauss–Bonnet Gravity

Hassan,

Sahoo

2024

Annalen der Physik

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Recently, there has been significant interest regarding the regularization of a limit of Einstein–Gauss–Bonnet (EGB) gravity. This regularization involves re‐scaling the Gauss–Bonnet (GB) coupling constant as , which bypasses Lovelock's theorem and avoids Ostrogradsky instability. A noteworthy observation is that the maximally or spherically symmetric solutions for all the regularized gravities coincide in the scenario. Considering this, the wormhole solutions in the galactic halos are investigated based on three different choices of dark matter (DM) profiles, such as Universal Rotation Curve, Navarro–Frenk–White, and Scalar Field Dark Matter with the framework of EGB gravity. Also, the Karmarkar condition is used to find the exact solutions for the shape functions under different non‐constant redshift functions. The energy conditions for each DM profile are discussed and the influence of GB coefficient in violating energy conditions are noticed, especially null energy conditions. Further, some physical features of wormholes, viz. complexity factor, active gravitational mass, total gravitational energy, and embedding diagrams, have been explored.

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Relativistic wormhole surrounded by dark matter halos in symmetric teleparallel gravity

Mustafa

Maurya

Ray

2023

Fortschritte der Physik

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In this article we study the wormhole geometry in the galactic halo region under modified f () gravity, especially symmetric teleparallel gravity, where the nonmetricity scalar  drives the gravitational interaction. The wormhole solutions for the assumed form f () = 𝜶 + 𝜷 have been presented, where 𝜶 and 𝜷 are the model parameters. The assumption of f () is based on the fact that its behavior should change with assumed parametric values of 𝜶 as well as 𝜷 within specific physical bounds. Two such models are presented based on the physically motivated shape function and energy conditions. We have elaborately shown, via mathematical calculations and graphical plots, the following features in our model: (i) energy conditions, especially NEC, which is very instructive in connection to energy violation in modified gravity theory, (ii) the wormhole solutions in the regime of Navarro-Frenk-White (NFW) density profiles for the galactic halo regions, (iii) treatment with particles moving in closed orbits around the wormholes which exhibit epicyclic frequencies, and (iv) the red-blue shifts of the light coming from the wormhole throat in the vicinity of the dark matter halos. All the results and behaviors are satisfactory as well as interesting.

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Possible existence of wormholes in the central regions of halos

Cited by 63 publications

References 16 publications

Existence of traversable wormholes in the spherical stellar systems

Existence of traversable wormholes in the spherical stellar systems

Possibility of the Traversable Wormholes in the Galactic Halos within 4D Einstein–Gauss–Bonnet Gravity

Relativistic wormhole surrounded by dark matter halos in symmetric teleparallel gravity

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