Endeavours in Discrete Lorentzian Geometry; A thesis in five papers
Abstract
To solve the path integral for quantum gravity, one needs to regularise the spacetimes that are summed over. This regularisation usually is a discretisation, which makes it necessary to give up some paradigms or symmetries of continuum physics. Causal dynamical triangulations regularises the path integral through a simplicial discretisation that introduces a preferred time foliation. The first part of this thesis presents three articles on causal dynamical triangulations. The first article shows how to obtain a multicritical 2d model by coupling the theory to hard dimers. The second explores the connection to HořavaLifshitz gravity that is suggested by the time foliation and establishes that in 2d the theories are equivalent. The last article does not directly concern causal dynamical triangulations but Euclidian dynamical triangulations with an additional measure term, which are examined to understand whether they contain an extended phase without the need for a preferred time foliation. Causal set theory uses an explicitly Lorentz invariant discretisation, which introduces nonlocal effects. The second part of this thesis presents two articles in causal set theory. The first explicitly calculates closed form expressions for the d'Alembertian operator in any dimension, which can be implemented in computer simulations. The second develops a ruler to examine the manifoldlikeness of small regions in a causal set, and can be used to recover locality.
 Publication:

arXiv eprints
 Pub Date:
 September 2014
 arXiv:
 arXiv:1409.8144
 Bibcode:
 2014arXiv1409.8144G
 Keywords:

 General Relativity and Quantum Cosmology
 EPrint:
 Ph.D. thesis, slight modification for online version, 105 pages