Generation of gravitational waves in dynamical Chern-Simons gravity

Abstract

We investigate gravitational waves (GWs) generated in a two-field inflationary model with a non-canonical kinetic term, in which the gravitational Chern-Simons term is coupled to a heavy dynamical field. In such a model, primordial GWs experience a period of resonant amplification for some modes. In addition, isocurvature perturbations suffer from a temporary tachyonic instability due to an effective negative mass, which source curvature perturbations, resulting in large induced GWs. These two stochastic gravitational wave backgrounds correspond to different frequency bands, which are expected to be detected by future GW detectors such as SKA, LISA and Taiji.

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Cited by in corpus (11)

• Polarized primordial gravitational waves in spatial covariant gravities
• Generating enhanced parity-violating gravitational waves during inflation with violation of the null energy condition
• Parity-violation in bouncing cosmology
• Gravitational Waves in Chern-Simons-Gauss-Bonnet Gravity
• Polarized gravitational waves in the parity violating scalar-nonmetricity theory
• Alternative LISA-TAIJI networks: Detectability of the Parity Violation in Stochastic Gravitational Wave Background
• Parity-violating primordial gravitational waves from null energy condition violation
• Chiral Gravitational Wave Background from Audible Axion via Nieh-Yan Term
• Amplifying quantum discord during inflationary magnetogenesis through violation of parity
• Flattened bispectrum of the scalar-induced gravitational waves
• Bridging inflation and reheating: chiral gravitational waves from aHz to GHz