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This article is cited in 6 scientific papers (total in 6 papers)
Classical Euclidean wormhole solutions in the Palatini $f(\widetilde R)$ cosmology
F. Darabi Department of Physics, Azarbaijan Shahid Madani University, Tabriz, Iran
Abstract:
We study the classical Euclidean wormholes in the context of extended theories of gravity. Without loss of generality, we use the dynamical equivalence between $f(\widetilde R)$ gravity and scalar–tensor theories to construct a pointlike Lagrangian in the flat Friedmann–Robertson–Walker space–time. We first show the dynamical equivalence between the Palatini $f(\widetilde R)$ gravity and the Brans–Dicke theory with a self-interaction potential and then show the dynamical equivalence between the Brans–Dicke theory with a self-interaction potential and the minimally coupled O'Hanlon theory. We show the existence of new Euclidean wormhole solutions for this O'Hanlon theory; in a special case, we find the corresponding form of $f(\widetilde R)$ that has a wormhole solution. For small values of the Ricci scalar, this $f(\widetilde R)$ agrees with the wormhole solution obtained for the higher-order gravity theory $\widetilde R+\epsilon \widetilde R^2$, $\epsilon<0$.
Keywords:
Euclidean wormhole, $f(R)$ cosmology, scalar–tensor theory.
Received: 15.02.2012 Revised: 27.04.2012
Citation:
F. Darabi, “Classical Euclidean wormhole solutions in the Palatini $f(\widetilde R)$ cosmology”, TMF, 173:3 (2012), 468–478; Theoret. and Math. Phys., 173:3 (2012), 1734–1742
Linking options:
https://www.mathnet.ru/eng/tmf8329https://doi.org/10.4213/tmf8329 https://www.mathnet.ru/eng/tmf/v173/i3/p468
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Abstract page: | 434 | Full-text PDF : | 213 | References: | 38 | First page: | 9 |
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