Quantum Gravity and String Theory


Objections to Quantum Gravity Theories based on Causal Dynamical Triangulation

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).

Download: PDF

Submission history

[v1] 10 Mar 2010
[v2] 11 Mar 2010

Unique-IP document downloads: 203 times

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