Chirality oscillation of primordial gravitational waves during inflation

Abstract

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.

arXiv comment14 pages, 11 figures; published version in JHEP; one figure added; references and comments added

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Cited by in corpus (18)

• Parity breaking signatures from a Chern-Simons coupling during inflation: the case of non-Gaussian gravitational waves
• Measuring chiral gravitational waves in Chern-Simons gravity with CMB bispectra
• Propagation of the gravitational waves in a cosmological background
• Polarized primordial gravitational waves in the ghost-free parity-violating gravity
• Propagation of Gravitational Waves in Chern-Simons Axion Einstein Gravity
• Parity violating gravitational waves at the end of inflation
• Generating enhanced parity-violating gravitational waves during inflation with violation of the null energy condition
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• Chiral primordial blue tensor spectra from the axion-gauge couplings
• Parity-violation in bouncing cosmology
• Generation of gravitational waves in dynamical Chern-Simons gravity
• Chiral Gravitational Waves in Palatini Chern-Simons
• Parity violation in primordial tensor non-Gaussianities from matter bounce cosmology
• Chiral primordial gravitational waves in extended theories of Scalar-Tensor gravity
• Cosmic topology. Part IIIa. Microwave background parity violation without parity-violating microphysics
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• Gravitational Waves from Primordial Black Holes formed by Null Energy Condition Violation during Inflation