Comments on "Searching for a continuum limit in CDT quantum gravity"
arXiv:1604.01798
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.
arXiv comment3 pages plus references
References in corpus (14)
- Spectral Dimension of the Universe
- Emergence of a 4D World from Causal Quantum Gravity
- Reconstructing the Universe
- Planckian Birth of the Quantum de Sitter Universe
- The Nonperturbative Quantum de Sitter Universe
- Semiclassical Universe from First Principles
- A second-order phase transition in CDT
- Second- and First-Order Phase Transitions in CDT
- The Semiclassical Limit of Causal Dynamical Triangulations
- On the running of the gravitational constant
- Renormalization Group Flow in CDT
- A Validation of Causal Dynamical Triangulations
- Renormalization of lattice-regularized quantum gravity models II. The case of causal dynamical triangulations
- Renormalization of lattice-regularized quantum gravity models I. General considerations