Zobrazeno 1 - 10
of 77
pro vyhledávání: '"Lavrelashvili, George"'
We study the perturbative stability of Euclidean axion-dilaton wormholes that asymptotically approach flat space, both with a massless and a massive dilaton, and focussing on homogeneous perturbations. We find massless wormholes to always be perturba
Externí odkaz:
http://arxiv.org/abs/2312.08971
As was discovered some time ago by Giddings and Strominger (GS), an axion can support a wormhole geometry in the presence of a massless dilaton, as long as the dilaton coupling remains below a critical value. We find that when the dilaton becomes mas
Externí odkaz:
http://arxiv.org/abs/2306.11129
We study generalisations of the Schwarzschild-de Sitter solution in the presence of a scalar field with a potential barrier. These static, spherically symmetric solutions have two horizons, in between which the scalar interpolates at least once acros
Externí odkaz:
http://arxiv.org/abs/2109.04180
Publikováno v:
Phys. Rev. D 104, 044007 (2021)
We study a self-interacting scalar field theory coupled to gravity and are interested in spherically symmetric solutions with a regular origin surrounded by a horizon. For a scalar potential containing a barrier, and using the most general sphericall
Externí odkaz:
http://arxiv.org/abs/2104.13403
Publikováno v:
Phys. Rev. D 100, 125006 (2019)
Some solutions describing vacuum decay exhibit a catastrophic instability. This, so-called negative mode problem in quantum tunneling with gravity, was discovered 34 years ago and in spite of the fact that in these years many different groups worked
Externí odkaz:
http://arxiv.org/abs/1906.07033
Akademický článek
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Publikováno v:
Phys. Rev. D 94, 064032 (2016)
We study quantum mechanical tunneling using complex solutions of the classical field equations. Simple visualization techniques allow us to unify and generalize previous treatments, and straightforwardly show the connection to the standard approach u
Externí odkaz:
http://arxiv.org/abs/1605.02751
We study the process of quantum tunnelling in self-interacting scalar field theories with non-minimal coupling to gravity. In these theories gravitational instantons can develop a neck -- a feature prohibited in theories with minimal coupling, and de
Externí odkaz:
http://arxiv.org/abs/1603.08728
Publikováno v:
Phys. Rev. D 92, 023506 (2015)
In the absence of gravity, one can prove that tunnelling instantons exhibit exactly one negative mode in their spectrum of fluctuations. It is precisely the existence of this tunnelling negative mode that warrants an interpretation of these solutions
Externí odkaz:
http://arxiv.org/abs/1504.04334
Autor:
Kahniashvili, Tina, Kar, Arjun, Lavrelashvili, George, Agarwal, Nishant, Heisenberg, Lavinia, Kosowsky, Arthur
Publikováno v:
Phys. Rev. D 91, 041301 (2015)
Quasidilaton massive gravity offers a physically well-defined gravitational theory with non-zero graviton mass. We present the full set of dynamical equations governing the expansion history of the universe, valid during radiation domination, matter
Externí odkaz:
http://arxiv.org/abs/1412.4300