Ponente
Descripción
The evidence of a Stochastic Gravitational Wave Background (SGWB) in the nHz frequency range is posed to open a new window on the Universe. A preferred explanation relies on a supercooled first order phase transition at the 100 MeV–GeV scale. I will address the feasibility of this solution by discussing viable dark sectors and their constraints, going from the particle physics model to the production of the gravitational waves, by also taking into account the challenges faced by a supercooled first order phase transition explanation.
I will also present ELENA, a new public software that allows for a fast and precise computation of the first order phase transition dynamics and gravitational waves spectrum, by employing the tunnelling potential formalism instead of the commonly used bounce equations. ELENA allows to compute the SGWB starting from a Lagrangian input, while going beyond several simplifying assumptions often employed in the literature.
