Chirality oscillation of primordial gravitational waves during inflation

A bstract We show that if the gravitational Chern-Simons term couples to a massive scalar field ( m > H ), the primordial gravitational waves (GWs) will show itself the chirality oscillation, i.e., the amplitudes of the left- and right-handed GWs modes will convert into each other and oscillate i...

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Bibliographic Details
Published in:The journal of high energy physics 2017-03, Vol.2017 (3), p.1-13, Article 24
Main Authors: Cai, Yong, Wang, Yu-Tong, Piao, Yun-Song
Format: Article
Language:English
Subjects:
Amplitudes
Chirality
Classical and Quantum Gravitation
Elementary Particles
Gravitation
Gravitational waves
High energy physics
Inflation
Physics
Physics and Astronomy
Power spectra
Quantum Field Theories
Quantum Field Theory
Quantum Physics
Regular Article - Theoretical Physics
Relativity Theory
Scalars
String Theory
Wave propagation
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Summary:A bstract We show that if the gravitational Chern-Simons term couples to a massive scalar field ( m > H ), the primordial gravitational waves (GWs) will show itself the chirality oscillation, i.e., the amplitudes of the left- and right-handed GWs modes will convert into each other and oscillate in their propagations. This oscillation will eventually develop a permanent difference of the amplitudes of both modes, which leads to nearly opposite oscillating shapes in the power spectra of the left- and right-handed primordial GWs. We discuss its implication to the CMB B-mode polarization.
ISSN:1029-8479
1029-8479
DOI:10.1007/JHEP03(2017)024