Modifications in the Spectrum of Primordial Gravitational Waves Induced by Instantonic Fluctuations

preprint2011arXivOpen access

Abstract

Vacuum to vacuum instantonic transitions modify the power spectrum of primordial gravitational waves. We evaluate the new form of the power spectrum for ordinary gravity as well as the parity violation induced in the spectrum by a modification of General Relativity known as Holst term and we outline the possible experimental consequences.

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