Comments on "Searching for a continuum limit in CDT quantum gravity"

TL;DR

This paper critiques recent methods for finding a continuum limit in causal dynamical triangulations, highlighting unstated assumptions and questioning their validity within current theoretical understanding.

Contribution

It clarifies the unstated assumptions behind recent lattice spacing measurements and challenges their justification in the context of causal dynamical triangulations.

Findings

Identifies unstated assumptions in recent measurements

Questions the validity of these assumptions within current CDT theory

Highlights the need for more rigorous justification of methods

Abstract

To facilitate the search for a continuum limit of causal dynamical triangulations, Ambjorn, Coumbe, Gizbert-Studnicki, and Jurkiewicz recently reported measurements of the lattice spacing as a function of the bare couplings. Although these authors' methods are technically sound, the conclusions that they draw from their analyses rest crucially on certain unstated assumptions. I elucidate these assumptions, and I argue that our current understanding of causal dynamical triangulations does not entail their justification.