Abstract
The linearized Einstein equation describing graviton propagation through a chiral medium appears to be helicity dependent. We analyze features of the corresponding spectrum in a collision-less regime above a flat background. In the long wave-length limit, circularly polarized metric perturbations travel with a helicity dependent group velocity that can turn negative giving rise to a new type of an anomalous dispersion. We further show that this chiral anomalous dispersion is a general feature of polarized modes propagating through chiral plasmas extending our result to the electromagnetic sector.
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Sadofyev, A., Sen, S. Chiral anomalous dispersion. J. High Energ. Phys. 2018, 99 (2018). https://doi.org/10.1007/JHEP02(2018)099
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DOI: https://doi.org/10.1007/JHEP02(2018)099