Finding sound shells in LISA mock data using likelihood sampling

We study to what extend LISA can observe features of gravitational wave spectra originating from cosmological first-order phase transitions. focus on which are the form double-broken power laws. These predicted by hydrodynamic simulations and also analytical models such as sound shell model. argue that ratio two break frequencies is an interesting observable since it be related wall velocity while overall amplitude frequency range often degenerate for numerous characteristics transition. Our analysis uses mock data obtained simplified model analyzes detection prospects using $\chi^2$-minimization likelihood sampling. point out observing electroweak transition hindered a shift spectrum smaller strong Finally, we highlight some differences between signals compared simulations.