1-5 July 2019
The University of Manchester
Europe/London timezone
Home > Timetable > Session details > Contribution details
PDF | XML | iCal

A Real-Time Picture of False Vacuum Decay

Presented by Dr. Jonathan BRADEN on 2 Jul 2019 from 14:50 to 15:10
Type: oral presentation
Track: String Theory and Alternatives


Quantum decay of false vacuum states via the nucleation of bubbles may have played an important role in the early history of our Universe. For example, in multiverse models that utilize false vacuum eternal inflation, the Big Bang of our observable Universe corresponds to one of these bubble nucleation events. Further, our observable Universe may have undergone a series of symmetry-breaking first-order phase transitions as it cooled, which may have produced a remnant background of gravitational waves. I will present results from a new real-time picture of false vacuum decay which, in contrast to existing semiclassical techniques, does not rely on classically forbidden tunneling paths. Lattice simulations are used to evolve initial realizations of fluctuations around the false vacuum forward in time via the classical equations of motion. In these simulations, we observe the false vacuum decay via the formation and subsequent expansion and coalescence of true vacuum bubbles. By sampling initial field realizations, we build up ensembles of these decay histories and empirically determine the bubble nucleation rate. The rates agree well with standard Euclidean techniques, which cannot provide a time-dependent description of the decay. Novel applications of our new approach include investigation of bubble-bubble correlation functions, decay of non-vacuum initial states, and the regime of rapid decays.


Location: Schuster
Room: Annex: Bell Burnell Lecture Theatre

Primary authors