Speaker
Stephon Alexander
Description
We study the vacuum amplification of chiral gravitational waves in dynamical Chern–Simons gravity. Graviton production arises from the parity-violating Pontryagin coupling, leaving distinct signatures in the stochastic gravitational wave background. We analyze four scenarios for the pseudoscalar evolution—rapid velocity transitions, finite constant velocity, and effective fluid-like behavior—and show that each can produce spectra dominated by parity violation. We compare these predictions with the sensitivity of current and upcoming detectors, highlighting observational windows to test chiral gravitational waves.