Generic predictions of quantum theories of gravity

Abstract

I discuss generic consequences (sometimes called "soft predictions") of a class of background independent quantum theories of spacetime called causal spin network theories. These are theories whose kinematics and dynamics is based on the evolution of labeled graphs, by local moves, such as in loop quantum gravity and spin foam models. Some generic consequences are well known, including the discreteness of quantum geometry, the elimination of spacetime singularities, the entropy of black hole and cosmological horizons and the fact that positive cosmological constant spacetimes are hot. Within the last few years three possible generic consequences have come to light. These are 1) Deformed special relativity as the symmetry of the ground state, 2) Elementary particles as coherent excitations of quantum geometry, 3) Locality is disordered. I discuss some possible experimental consequences of each.

For inclusion in "Approaches to Quantum Gravity - toward a new understanding of space, time, and matter", edited by D. Oriti, to be published by Cambridge University Press

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• A Topos Foundation for Theories of Physics: I. Formal Languages for Physics
• Raiders of the lost spacetime
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• The status of cosmological natural selection
• Indeterminacy of Holographic Quantum Geometry
• Spectroscopy of a canonically quantized horizon
• Emergent Braided Matter of Quantum Geometry
• Holographic Geometry and Noise in Matrix Theory
• Exotic Statistics for Ordinary Particles in Quantum Gravity
• Holographic Noise in Interferometers
• In search of lost spacetime: philosophical issues arising in quantum gravity
• Spacetime is as spacetime does
• Non Linear Lorentz Transformation and Doubly Special Relativity