Phenomenology of Causal Dynamical Triangulations

TL;DR

This paper explores the empirical implications of four-dimensional Causal Dynamical Triangulations (CDT) in quantum gravity, discussing how astrophysical and cosmological observations could test its predictions and potentially rule out certain scenarios.

Contribution

It analyzes the potential for empirical testing of CDT's unique predictions using observational data, highlighting scenarios that can be empirically invalidated.

Findings

Certain CDT scenarios can be ruled out through observations

CDT predicts a non-trivial phase structure of gravity

Dimensional running in CDT offers testable implications

Abstract

The four dimensional Causal Dynamical Triangulations (CDT) approach to quantum gravity is already more than ten years old theory with numerous unprecedented predictions such as non-trivial phase structure of gravitational field and dimensional running. Here, we discuss possible empirical consequences of CDT derived based on the two features of the approach mentioned above. A possibility of using both astrophysical and cosmological observations to test CDT is discussed. We show that scenarios which can be ruled out at the empirical level exist.