Speaker
Description
Despite the tremendous success of the Standard Model (SM) to describe matter and its interactions, we know Beyond the SM (BSM) theories are necessary to solve some of the open problems in physics. The current generation of colliders is not effective in testing such theories. However, gravitational waves (GWs) emitted in the Electroweak Phase Transition may be detected as a stochastic background by upcoming experiments such as LISA. Their spectrum can provide hints of the underlying theory. We covered the relevant concepts of phase transitions and introduced state-of-the-art formulae for the stochastic GW background (SGWB) spectrum. We presented the complex singlet extension of the SM (cxSM). Using the numerical tool, CosmoTransitions, we computed the SGWB spectrum for the simplest case of the cxSM, where the complex singlet does not acquire a vacuum expectation value at $T=0$. We found only weak first-order phase transitions not detectable by LISA. We also addressed concerns regarding numerical instabilities on calculating the Euclidean action. No instabilities were found for the computed phase transition.
