13-19 June 2015
University of Alberta
America/Edmonton timezone
Welcome to the 2015 CAP Congress! / Bienvenue au congrès de l'ACP 2015!

A Correlated Worldline Theory of Quantum Gravity

Jun 18, 2015, 9:15 AM
CCIS L1-047 (University of Alberta)

CCIS L1-047

University of Alberta

Invited Speaker / Conférencier invité Theoretical Physics / Physique théorique (DTP-DPT) R1-5 Quantum Gravity and Quantum Cosmology (DTP) / Gravité quantique et cosmologie quantique (DPT)


Prof. Philip Stamp (UBC)


It is argued that gravity should cause a breakdown of quantum mechanics, at low energies, accessible in principle to table-top experiments. I show that one can formulate a theory of quantum gravity in which gravitational correlations exist between worldline or worldsheet paths, for the particle or field of interest. Using a generalized equivalence principle, one can give a unique form for the correlators, yielding a theory with no adjustable parameters. Quantitative calculations are carried out in a background field effective theory, applicable to all energies of experimental interest. A key feature of the theory is the "bunching" of quantum trajectories caused by the gravitational correlations - this is NOT a decoherence or a "collapse" mechanism. This bunching causes a very rapid breakdown of the superposition principle for energies above 8 orders of magnitude below the Planck mass. In table-top experiments, large slow-moving masses also exhibit this effect, which suppresses all coherence and entanglement phenomena.

Primary author

Prof. Philip Stamp (UBC)

Presentation materials