Quantum gravity effects on space-time

Research output: Contribution to conferencePaperpeer-review


General relativity promotes space-time to a physical, dynamical object subject to equations of motion. Quantum gravity, accordingly, must provide a quantum framework for space-time, applicable on the smallest distance scales. Just like generic states in quantum mechanics, quantum space-time structures may be highly counterintuitive. But if low-energy effects can be extracted, they shed considerable light on the implications to be expected for a dynamical quantum space-time. Loop quantum gravity has provided several such effects, but even in the symmetry-reduced setting of loop quantum cosmology no complete picture on effective space-time geometries describing especially the regime near the big bang has been obtained. The overall situation regarding space-time structures and cosmology is reviewed here, with an emphasis on the role of dynamical states, effective equations, and general covariance.

Original languageEnglish (US)
Number of pages16
StatePublished - Dec 1 2009
Event19th Workshop on General Relativity and Gravitation in Japan, JGRG 2009 - Tokyo, Japan
Duration: Nov 30 2009Dec 4 2009


Other19th Workshop on General Relativity and Gravitation in Japan, JGRG 2009

All Science Journal Classification (ASJC) codes

  • Atomic and Molecular Physics, and Optics


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