This cosmological first-order phase transitions workshop aims to deepen our understanding of these critical events in the early Universe, exploring their theoretical foundations, phenomenological impacts, and experimental prospects. First-order phase transitions, predicted by many models beyond the Standard Model, can significantly affect the Universe's evolution, such as influencing the expansion rate, forming topological defects, and producing primordial black holes.

A key focus will be on the stochastic gravitational wave background generated by these transitions, offering a unique observational window into high-energy physics through current and future gravitational wave detectors.

This workshop, organized by Aleksandr Azatov (SISSA), Enrico Morgante (University of Trieste), Toby Opferkuch (SISSA), Nicklas Ramberg (Johannes Gutenberg University Mainz), Pedro Schwaller (Johannes Gutenberg University Mainz), and Lorenzo Ubaldi (IJS Ljubljana), will feature a flexible schedule with a few talks each day to prioritize discussions and foster interactions among participants. An up-to-date schedule is provided under the timetable section.