Authors: Ervin Goldfain
This memo is in regards to the recently published contribution by Ambjorn J. et al. "Planckian Birth of Quantum de Sitter Universe" PRL 100, 091304 (2008). The article claims that "causal dynamical triangulation" enables a consistent regularization of quantum gravity. A "quantum universe" emerging from a nonperturbative sum over geometries is alleged to recover "with high accuracy a fourdimensional de Sitter space-time". On closer examination, the approach is built on many objectionable premises
Comments: 2 pages, Letters submitted to the Editors of Classical and Quantum Gravity (v1) and Physics Review Letters (v2).
Unique-IP document downloads: 186 times
Add your own feedback and questions here:
You are equally welcome to be positive or negative about any paper but please be polite. If you are being critical you must mention at least one specific error, otherwise your comment will be deleted as unhelpful.