PIRSA:22120048

Video URL

https://pirsa.org/22120048

Catalysed Vacuum Decay

Nee, M. (2022). Catalysed Vacuum Decay. Perimeter Institute for Theoretical Physics. https://pirsa.org/22120048

Nee, Michael. Catalysed Vacuum Decay. Perimeter Institute for Theoretical Physics, Dec. 16, 2022, https://pirsa.org/22120048 

          @misc{ scivideos_PIRSA:22120048,
            doi = {10.48660/22120048},
            url = {https://pirsa.org/22120048},
            author = {Nee, Michael},
            keywords = {Particle Physics},
            language = {en},
            title = {Catalysed Vacuum Decay},
            publisher = {Perimeter Institute for Theoretical Physics},
            year = {2022},
            month = {dec},
            note = {PIRSA:22120048 see, \url{https://scivideos.org/pirsa/22120048}}
          }

Michael Nee University of Oxford

Talk numberPIRSA:22120048
DOI10.48660/22120048
Source RepositoryPIRSA
Collection
Talk Type Scientific Series
Subject

Abstract

Phase transitions in everyday systems are often catalysed by the presence of impurities, but in cosmology we typically assume the initial state is a homogeneous vacuum. In this talk I will discuss how topological defects can seed first order phase transitions in the early universe, causing them to proceed much more rapidly than in the usual case. The field profiles describing the decay do not have the typically assumed O(3)/O(4) symmetry, requiring an extension of the usual decay rate calculation. To numerically determine the saddle point solutions which describe the decay we use a new algorithm based on the mountain pass theorem. I will present results showing the significance of this effect for catalysis by magnetic monopoles in a simplified model, then discuss the same effect for domain walls catalysing the electroweak phase transition. The presence of domain walls can significantly modify the predictions for gravitational wave signal which may be observed with LISA.

Zoom link:  https://pitp.zoom.us/j/96182819088?pwd=cXhnVjFlT0tkc1VsRld0Yk43bFROUT09