Physical Review D - Particles, Fields, Gravitation, and Cosmology
A cosmological gauge field with isotropic stress-energy introduces parity violation into the behavior of gravitational waves. We show that a primordial spectrum of inflationary gravitational waves develops a preferred handedness, left or right circularly polarized, depending on the abundance and coupling of the gauge field during the radiation era. A modest abundance of the gauge field would induce parity-violating correlations of the cosmic microwave background temperature and polarization patterns that could be detected by current and future experiments.
Dartmouth Digital Commons Citation
Bielefeld, Jannis and Caldwell, Robert R., "Chiral Imprint of a Cosmic Gauge Field on Primordial Gravitational Waves" (2015). Dartmouth Scholarship. 1958.