COSMO19

Resonant decay of gravitational waves into dark energy

5 Sept 2019, 17:05

25m

Talk Modified Gravity and Dark Energy Parallel Sessions: Modified Gravity and Dark Energy (C.A.R.L., H03)

Speaker

Mr Vicharit Yingcharoenrat

Description

In this talk, I will discuss the decay of gravitational waves (GWs) into dark energy fluctuations $\gamma \rightarrow \pi\pi$ taking into account the large occupation numbers. We study the decay due to the $m_3^3$- and $\tilde{m}_4^2$-operators in the context of the effective field theory (EFT) of dark energy. It turns out that, in the regime of small GW amplitude corresponding to narrow resonance, the produced waves $\pi$ feature an instability that grows exponentially. However, once the $\pi$ non-linearities become important the previous analysis fails to describe the productions. This non-linear effect is relevant for the $m_3^3$-operator, while it can be neglected for the $\tilde{m}_4^2$-operator.

Presentation materials

Yingcharoenrat_COSMO19.pdf