Physics – High Energy Physics – High Energy Physics - Theory
Scientific paper
2010-04-02
Physics
High Energy Physics
High Energy Physics - Theory
To appear in "Foundations of Space and Time", Cambridge Univ. Press, eds. G. Ellis, J. Murugan, A Weltman
Scientific paper
Quantum Gravity by Causal Dynamical Triangulation has over the last few years emerged as a serious contender for a nonperturbative description of the theory. It is a nonperturbative implementation of the sum-over-histories, which relies on few ingredients and initial assumptions, has few free parameters and - crucially - is amenable to numerical simulations. It is the only approach to have demonstrated that a classical universe can be generated dynamically from Planckian quantum fluctuations. At the same time, it allows for the explicit evaluation of expectation values of invariants characterizing the highly nonclassical, short-distance behaviour of spacetime. As an added bonus, we have learned important lessons on which aspects of spacetime need to be fixed a priori as part of the background structure and which can be expected to emerge dynamically.
Ambjorn Jan
Jurkiewicz Jerzy
Loll Renate
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