Gravitational Wave Decay into Dark Energy

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• Giovanni Tambalo (ICTP)
• Monday 18 February 2019, 13:00-14:00
• CMS, Pav. B, CTC Common Room (B1.19) [Potter Room].

If you have a question about this talk, please contact Sadra Jazayeri.

We study the decay of gravitational waves into dark energy fluctuations made possible by the spontaneous breaking of Lorentz invariance. In addition to this effect, we find that radiative corrections induce modifications in the dispersion relation for gravitons.

The requirements that gravitational waves are stable on cosmological scales, and that they travel at the speed of light, rules out all quartic and quintic GLPV theories. Conversely, operators up to cubic Horndeski induce small quantum corrections and appear to be experimentally viable. Nonetheless we find that classical effects provide additional constraints to the parameter space of these surviving models.

This talk is part of the Cosmology Lunch series.

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