QF1 - Quantum Spacetime |
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Speaker |
Morsella, Gerardo |
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| Talk Title |
Spherically Symmetric Quantum Spacetime and the Horizon Problem |
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Abstract |
The analysis of the limitations to spacetime localization of events dictated by the concurrence of general relativity and quantum mechanics, performed by Doplicher-Fredenhagen-Roberts in a flat background, are extended to spherically symmetric spacetimes. The results support the heuristic expectation that in a curved background the effective Planck length depends on the underlying geometry. This also leads to a natural ansatz for the expectation value, in a thermal state, of the energy-momentum tensor of a free scalar field propagating on the corresponding curved Quantum Spacetime. When such a field is coupled semi-classically to the metric, the resulting cosmological evolution is free from the horizon problem. (Based on joint work with Sergio Doplicher and Nicola Pinamonti.) |
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