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.

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

References in corpus (10)

• Effective Field Theory for Inflation
• Large Nongaussianity in Axion Inflation
• Chiral Primordial Gravitational Waves from a Lifshitz Point
• Probing polarization states of primordial gravitational waves with CMB anisotropies
• Anomalous CMB polarization and gravitational chirality
• Oscillating Chiral Tensor Spectrum from Axionic Inflation
• Fluctuations of cosmological birefringence and the effect on CMB B-mode polarization
• $CPT$ Violating Electrodynamics and Chern-Simons Modified Gravity
• Oscillating modulation to B-mode polarization from varying propagating speed of primordial gravitational waves
• Detecting chiral gravity with the pure pseudospectrum reconstruction of the cosmic microwave background polarized anisotropies

Cited by in corpus (14)

• Parity breaking signatures from a Chern-Simons coupling during inflation: the case of non-Gaussian gravitational waves
• Polarized primordial gravitational waves in the ghost-free parity-violating 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
• Generating enhanced primordial GWs during inflation with intermittent violation of NEC and diminishment of GW propagating speed
• Parity-violation in bouncing cosmology
• Generation of gravitational waves in dynamical Chern-Simons gravity
• Chiral Gravitational Waves in Palatini Chern-Simons
• Chiral primordial gravitational waves in extended theories of Scalar-Tensor gravity
• Parity violation in primordial tensor non-Gaussianities from matter bounce cosmology
• Cosmic topology. Part IIIa. Microwave background parity violation without parity-violating microphysics
• Parity-violating primordial gravitational waves from null energy condition violation
• Chiral Gravitational Wave Background from Audible Axion via Nieh-Yan Term
• Gravitational Waves from Primordial Black Holes formed by Null Energy Condition Violation during Inflation