Parity violation in pre-inflationary bounce

DOI10.1016/J.PHYSLETB.2014.12.011zbMATH Open1373.83137arXiv1409.7153OpenAlexW2051869077MaRDI QIDQ1674729

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Publication date: 26 October 2017

Published in: (Search for Journal in Brave)

Abstract: The power suppression at largest scale in the CMB TT powerspectrum might imply the occurrence of a pre-inflationary bounce. We calculate the circularly polarized gravitational wave, leaded by the gravitational Chern-Simons term which universally appears in particle physics and string theory, in an inflationary background with the pre-inflationary bounce. The circularly polarized gravitational wave will induce TB and EB correlations at CMB last scatting surface. We find that although the BB powerspectrum at largest scale is also suppressed, the TB and EB powerspectra at corresponding scales may be enhanced.

Full work available at URL: https://arxiv.org/abs/1409.7153

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