Scalar induced gravitational waves from Chern-Simons gravity during inflation era
Jia-Xi Feng, Fengge Zhang, Xian Gao
Abstract
Abstract We investigate the scalar induced gravitational waves (SIGWs) in the Chern-Simons (CS) gravity with a dynamical scalar field during slow roll inflation. Due to the parity violation in the CS term, the SIGWs are generally polarized, which are effectively characterized by the degree of circular polarization. We derive the semianalytic expression to evaluate the power spectra and the degree of circular polarization of the SIGWs, which receive contributions from the general relativity and the parity-violating term, respectively. We find that the correction from the parity-violating CS term is negligible on large scales, which means that the degree of circular polarization of SIGWs is very small.
Topics & Concepts
PhysicsGravitational waveGeneral relativityChern–Simons theoryPolarization (electrochemistry)Scalar fieldGravitationParity (physics)Scalar (mathematics)Inflation (cosmology)Quantum electrodynamicsCircular polarizationClassical mechanicsMathematical physicsTheoretical physicsAstrophysicsQuantum mechanicsMagnetic fieldGeometryMathematicsPhysical chemistryChemistryGauge theoryCosmology and Gravitation TheoriesPulsars and Gravitational Waves ResearchBlack Holes and Theoretical Physics