scholarly journals Perturbative dynamics of thin-shell wormholes beyond general relativity: An alternative approach

2017 ◽  
Vol 27 (01) ◽  
pp. 1750171 ◽  
Author(s):  
Emilio Rubín de Celis ◽  
Cecilia Tomasini ◽  
Claudio Simeone
Keyword(s):  
General Relativity ◽  
Thin Shell ◽  
Equations Of State ◽  
Thin Shells ◽  
Strong Restriction ◽  
Alternative Approach ◽  
Thin Shell Wormholes

Recent studies relating the approximations for the equations-of-state for thin shells and their consequent perturbative evolution are extended to thin-shell wormholes in theories beyond general relativity and more than four spacetime dimensions. The assumption of equations-of-state of the same form for static and slowly evolving shells appears as a strong restriction excluding the possibility of oscillatory evolutions. Then the new results considerably differ from previous ones obtained within the usual linearized approach.

scholarly journals On the Stability of Thin-Shell Wormholes in Noncommutative Geometry

2012 ◽  
Vol 2012 ◽  
pp. 1-12 ◽  
Author(s):  
Peter K. F. Kuhfittig
Keyword(s):  
General Relativity ◽  
Noncommutative Geometry ◽  
Special Class ◽  
Thin Shell ◽  
Thin Shell Wormholes ◽  
The Stability

This paper reexamines a special class of thin-shell wormholes that are unstable in general relativity in the framework of noncommutative geometry. It is shown that, as a consequence of the intrinsic uncertainty, these wormholes are stable to small linearized radial perturbations. Several different spacetimes are considered.

scholarly journals Thin-shells and thin-shell wormholes in new massive gravity

2019 ◽  
Vol 79 (6) ◽  
Author(s):  
S. Danial Forghani ◽  
S. Habib Mazharimousavi ◽  
M. Halilsoy
Keyword(s):  
Thin Shell ◽  
Massive Gravity ◽  
Thin Shells ◽  
Thin Shell Wormholes

scholarly journals Stability of spherically symmetric timelike thin-shells in general relativity with a variable equation-of-state

2017 ◽  
Vol 26 (14) ◽  
pp. 1750158 ◽  
Author(s):  
S. Habib Mazharimousavi ◽  
M. Halilsoy ◽  
S. N. Hamad Amen
Keyword(s):  
General Relativity ◽  
Equation Of State ◽  
Energy Density ◽  
Surface Energy ◽  
Thin Shell ◽  
Minkowski Spacetime ◽  
Thin Shells ◽  
Spherically Symmetric ◽  
Surface Energy Density ◽  
Variable Equation

We study spherically symmetric timelike thin-shells in [Formula: see text]-dimensional bulk spacetime with a variable equation-of-state for the fluid presented on the shell. In such a fluid, the angular pressure [Formula: see text] is a function of both surface energy density [Formula: see text] and the radius [Formula: see text] of the thin-shell. Explicit cases of the thin shells connecting two nonidentical cloud of strings spacetimes and a flat Minkowski spacetime to the Schwarzschild metric are investigated.

scholarly journals Thin-shell wormholes in AdS5 and string dioptrics

2020 ◽  
Vol 2020 (10) ◽  
Author(s):  
Mariano Chernicoff ◽  
Edel García ◽  
Gaston Giribet ◽  
Emilio Rubín de Celis
Keyword(s):  
Thin Shell ◽  
Field Theories ◽  
Gauge Fields ◽  
Radial Coordinate ◽  
Thin Shells ◽  
Abelian Gauge ◽  
Codimension One ◽  
Higher Curvature Gravity ◽  
Thin Shell Wormholes ◽  
Small Separation

Abstract We consider string probes in a traversable wormhole geometry that connects two locally AdS5 asymptotic regions. Holographically, this describes two interacting copies of a 4-dimensional gauge theory. We consider string configurations whose endpoints are located either in the same boundary or in the two different boundaries of the wormhole. A string with both endpoints in the same boundary is dual to a quark-antiquark pair charged under the same gauge field, while a string extending through the wormhole describes a pair of colored particles charged under two different gauge fields. When one considers a quark-antiquark pair in each boundary, the system undergoes a phase transition: while for small separation each pair of charges exhibits Coulomb interaction, for large separation the charges in different field theories pair up. This behavior had previously been observed in other geometric realizations such as locally AdS5 wormhole solutions with hyperbolic throats. The geometries we consider here, in contrast, are stable thin-shell wormholes with flat codimension-one hypersurfaces at fixed radial coordinate. They appear as electrovacuum solutions of higher-curvature gravity theories coupled to Abelian gauge fields. The presence of the thin-shells produces a refraction of the string configurations in the bulk, leading to the presence of cusps in the phase space diagram. We discuss these and other features of the phase diagram, including the analogies and difference with other wormhole solutions considered in related contexts.

Thin-shell wormholes in rainbow gravity

2018 ◽  
Vol 33 (09) ◽  
pp. 1850049 ◽  
Author(s):  
Z. Amirabi ◽  
M. Halilsoy ◽  
S. Habib Mazharimousavi
Keyword(s):  
General Relativity ◽  
Thin Shell ◽  
Planck Scale ◽  
High Energy ◽  
Exotic Matter ◽  
Thin Shell Wormholes ◽  
The Stability ◽  
Planck Energy ◽  
High Energy Particles ◽  
Modified Theory

At the Planck scale of length [Formula: see text] m where the energy is comparable with the Planck energy, the quantum gravity corrections to the classical background spacetime results in gravity’s rainbow or rainbow gravity. In this modified theory of gravity, geometry depends on the energy of the test particle used to probe the spacetime, such that in the low energy limit, it yields the standard general relativity. In this work, we study the thin-shell wormholes in the spherically symmetric rainbow gravity. We find the corresponding properties in terms of the rainbow functions which are essential in the rainbow gravity and the stability of such thin-shell wormholes are investigated. Particularly, it will be shown that there are exact solutions in which high energy particles crossing the throat will encounter less amount of total exotic matter. This may be used as an advantage over general relativity to reduce the amount of exotic matter.

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