Eternal inflation predicts our observable universe lies within a bubble (or pocket universe) embedded in a volume of inflating space. The interior of the bubble undergoes inflation and standard cosmology, while the bubble walls expand outward and collide with other neighboring bubbles. The collisions provide either an opportunity to make a direct observation of the multiverse or, if they produc...

Abstract We apply the Lorentzian path integral to decay of a false vacuum and estimate false-vacuum rate. To make convergent, deformation an integration contour is performed by following Picard-Lefschetz theory. show that nucleation rate critical bubble, for which corresponding bounce action extremized, has same exponent as Euclidean approach. also extend our computation bubble larger or smalle...

The growth of bubbles within the body is widely believed to be the cause of decompression sickness (DCS). Dive computer algorithms that aim to prevent DCS by mathematically modelling bubble dynamics and tissue gas kinetics are challenging to validate. This is due to lack of understanding regarding the mechanism(s) leading from bubble formation to DCS. In this work, a biomimetic in vitro tissue ...