Results 71 to 80 of about 28,658 (246)

Possible existence of Rastall–Rainbow wormholes in dark matter galactic halos

The European Physical Journal C
The Rastall–Rainbow gravity theory has recently been proposed as a combination of the Rastall and rainbow theories. This theory can be thought as a generalization of the Rastall gravity to an energy dependent Rastall theory, and leads to an additional ...
A. Errehymy, Ayan Banerjee, S. Hansraj, O. Donmez, K. Nisar, A. Abdel‐Aty   +5 more
semanticscholar   +1 more source

Non-minimal Wu-Yang wormhole

, 2007
We discuss exact solutions of three-parameter non-minimal Einstein-Yang-Mills model, which describe the wormholes of a new type. These wormholes are considered to be supported by SU(2)-symmetric Yang-Mills field, non-minimally coupled to gravity, the Wu ...
A. B. Balakin, A. E. Zayats, A. C. Eringen, F. W. Hehl, K. A. Bronnikov, M. Visser, S. V. Sushkov, T. T. Wu, V. Faraoni, V. Rubakov   +9 more
core   +1 more source

Search for Wormhole Candidates: Accreting Wormholes with Monopole Magnetic Fields

Universe
The existence of even the simplest magnetized wormholes may lead to observable consequences. In the case where both the wormhole and the magnetic field around its mouths are static and spherically symmetric, and gas in the region near the wormhole falls ...
Mikhail Piotrovich, Serguei Krasnikov, Stanislava Buliga, Tinatin Natsvlishvili   +3 more
doaj   +1 more source

Dynamical conformal transformation and classical Euclidean wormholes

, 2011
We investigate the necessary condition for the existence of classical Euclidean wormholes in a conformally non-invariant gravitational model minimally coupled to an scalar field.
A. Hosoya, A.K. Gupta, D.H. Coule, F. Darabi, I. Klebanov, J. Cheeger, J.J. Halliwell, K. Lee, L. Ryder, R. Wald, S. Coleman, S. Coleman, S. Giddings, S. Hawking, S. Mignemi, S.W. Hawking, Y. Bisabr   +16 more
core   +1 more source

What Casimir Energy can suggest about Space Time Foam? [PDF]

, 2001
In the context of a model of space-time foam, made by $N$ wormholes we discuss the possibility of having a foam formed by different configurations. An equivalence between Schwarzschild and Schwarzschild-Anti-de Sitter wormholes in terms of Casimir energy
Garattini R., Mazur P.O., REMO GARATTINI
core   +2 more sources

BOUNCE AND WORMHOLES [PDF]

International Journal of Modern Physics A, 2009
We investigate if theories yielding bouncing cosmological models also generate wormhole solutions. We show that two of them present sensible traversable static wormhole solutions, while for the third possibility such solutions are absent.
Pinto-Neto, N., Poulis, F. P., Salim, J. M.   +2 more
openaire   +3 more sources

Comments on wormholes, ensembles, and cosmology [PDF]

Journal of High Energy Physics, 2020
Certain closed-universe big-bang/big-crunch cosmological spacetimes may be obtained by analytic continuation from asymptotically AdS Euclidean wormholes, as emphasized by Maldacena and Maoz.
Mark Van Raamsdonk
semanticscholar   +1 more source

Study of wormhole stability in the framework of black hole surrounded by the pseudo-isothermal dark matter halo

European Physical Journal C: Particles and Fields
This work is devoted to exploring the formation and stability of thin-shell wormholes developed through the two similar copies of black holes bounded by the pseudo-isothermal dark matter halo. It is found that the horizon radius of a black hole decreases
Faisal Javed, Arfa Waseem, Ghulam Fatima, Bander Almutairi   +3 more
doaj   +1 more source

What Is the Validity Domain of Einstein’s Equations? Distributional Solutions over Singularities and Topological Links in Geometrodynamics

Universe, 2016
The existence of singularities alerts that one of the highest priorities of a centennial perspective on general relativity should be a careful re-thinking of the validity domain of Einstein’s field equations.
Elias Zafiris
doaj   +1 more source

A 10d construction of Euclidean axion wormholes in flat and AdS space

Journal of High Energy Physics, 2023
Euclidean wormhole geometries sourced by axions and dilatons are puzzling objects in quantum gravity. From one side of the wormhole to the other, the scalar fields traverse a few Planck lengths in field space and so corrections from the UV might ...
Gregory J. Loges, Gary Shiu, Thomas Van Riet   +2 more
doaj   +1 more source