Chiral Imprint of a Cosmic Gauge Field on Primordial Gravitational Waves
arXiv:1412.6104 · doi:10.1103/PhysRevD.91.123501
Abstract
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.
arXiv comment5 pages, 6 figures
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- Higgsed Gauge-flation
- Parity violation in the CMB trispectrum from the scalar sector
- Breaking discrete symmetries in the effective field theory of inflation
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