Baby Universes in 4d Dynamical Triangulation

TL;DR

This paper numerically investigates the distribution of baby universes in 4d quantum gravity's dynamical triangulation model, providing evidence supporting the existence of an exponential bound relevant to the theory's consistency.

Contribution

It offers the first numerical analysis of baby universe distributions in 4d dynamical triangulation, addressing the exponential bound issue in quantum gravity models.

Findings

Data supports the existence of an exponential bound.

Distribution of baby universes is consistent with theoretical expectations.

Results contribute to understanding the phase structure of 4d quantum gravity.

Abstract

We measure numerically the distribution of baby universes in the crumpled phase of the dynamical triangulation model of 4d quantum gravity. The relevance of the results to the issue of an exponential bound is discussed. The data are consistent with the existence of such a bound.