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SÉMINAIRE DU GRECO
"Space-time discreteness in quantum gravity: possible consequences and a new perspective on the origin of dark energy ?" |
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Alejandro Perez |
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In this seminar I will first quickly review the results of the canonical quantization of general relativity suggesting a fundamentally discrete nature of geometry at the Planck scale. This calls for a fundamental description that is combinatorial and discrete where the smooth spacetime description of QFT and general relativity would only be emergent from the collective behavior of the Planckian local structures. In this framework time and Lorentz invariance are still open issues. Nevertheless, discreteness helps, as we will discuss, understanding some of the enigmatic properties of semiclassical black holes: it clarifies the origin of black hole entropy and provides a natural perspective on the issue of information in black hole evaporation.
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lundi 20 novembre 2017 - 11:00 Salle des séminaires Évry Schatzman, Institut d'Astrophysique de Paris |
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