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.
Primary author
Mr
Vicharit Yingcharoenrat
Co-authors
Dr
Paolo Creminelli
Mr
Giovanni Tambalo
Dr
Filippo Vernizzi
