Distortion of extra dimensions in the inflationary Multiverse

TL;DR

This paper investigates how quantum fluctuations during inflation cause diverse initial shapes of extra dimensions in the Multiverse, leading to varied low-energy physics across different pocket universes.

Contribution

It introduces a model for how quantum fluctuations influence the shape of extra dimensions and estimates the probability distribution of their metrics in the Multiverse.

Findings

Quantum fluctuations produce a wide range of initial extra metrics.

Different pocket universes have inhomogeneous extra dimensions.

Low energy physics varies across the Multiverse.

Abstract

We discuss the effect of the quantum fluctuations at high energies on the final shape of compact extra dimensions. The quantum fluctuations produce a wide range of the initial extra metrics in causally disconnected regions (pocket universes) of the Multiverse during the inflationary stage. This set of initial extra metrics evolves to a set of inhomogeneous metrics at the present time. The low energy physics appears to be different in different pocket universes. The numerical estimate of the probability of finding a specific metric is based on the model of the compact 2-dimensional extra space.