Vacuum tunneling in gravity

Details Vacuum tunneling in gravity Vacuum tunneling in gravity

2010-01-27

arxiv.org/abs/1001.4925v3

Class. Quantum Grav. 28 (2011) 155008

Physics

High Energy Physics

High Energy Physics - Theory

11 pages, 1 fig. is added, final version

Scientific paper

10.1088/0264-9381/28/15/155008

Topologically non-trivial vacuum structure in gravity models with Cartan variables (vielbein and contortion) is considered. We study the possibility of vacuum space-time tunneling in Einstein gravity assuming that the vielbein may play a fundamental role in quantum gravitational phenomena. It has been shown that in the case of RP3 space topology the tunneling between non-trivial topological vacuums can be realized by means of Eguchi-Hanson gravitational instanton. In Riemann-Cartan geometric approach to quantum gravity the vacuum tunneling can be provided by means of contortion quantum fluctuations. We define double self-duality condition for the contortion and give explicit self-dual configurations which can contribute to vacuum tunneling amplitude.

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