University of Cambridge > > DAMTP Friday GR Seminar > Horizons and Tunneling in the Euclidean False Vacuum

Horizons and Tunneling in the Euclidean False Vacuum

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In the thin-wall approximation, the decay of a gravitating false vacuum to a lower-energy state is affected by the cosmological horizon structure in both spaces. I show that the nucleation radius of a bubble of true vacuum depends on the surface tension of its boundary. This radius equals the false vacuum cosmological horizon at a critical tension, beyond which a tunneling instanton solution does not exist. I therefore argue that there is a bound on allowed membrane tension in theories which rely on semiclassical tunneling to relax the cosmological constant.

This talk is part of the DAMTP Friday GR Seminar series.

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