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Abstract:First-order phase transitions in the early universe are a unique probe of physics beyond the Standard Model, with potential implications for electroweak baryogenesis, the formation of primordial black holes, magnetogenesis and the production of dark matter. Upcoming gravitational wave detectors may capture the imprint of such transitions, but to extract theoretical insights from these signals requires a precise understanding of the underlying dynamics.
In this talk, I show how the language of nonequilibrium quantum field theory, combined with the two-particle-irreducible effective action, provides a natural framework for describing the dynamics of a bubble after nucleation. After a brief introduction to the closed-time-path formalism, I derive the dynamical equations governing the bubble and the plasma, and identify all sources of friction for the bubble expansion. This framework unifies the pre-existing approaches within a single, consistent description. In the ultrarelativistic regime, I demonstrate how to compute the friction induced by the pair production of heavy scalar particles and outline the contributions of particle mixing and transition radiation.
Biography:Matthias Carosi completed his PhD at the Technical University of Munich and is now a postdoctoral researcher at the International Centre for Theoretical Physics Asia-Pacific (ICTP-AP) in Beijing. His work focuses on theoretical aspects of phase transitions in quantum field theory, including semiclassical methods for the calculation of the nucleation rate and the real-time formalism to describe the evolution of bubbles after nucleation.
Alternatively online link:https://meeting.tencent.com/dm/PxPrYPAS98xt
ID：603313617