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Gravitational Constrained Instantons | | Jordan Cotler
; Kristan Jensen
; | | Date: |
5 Oct 2020 | | Abstract: | We find constrained instantons in Einstein gravity with and without a
cosmological constant. These configurations are not saddle points of the
Einstein-Hilbert action, yet they contribute to non-perturbative processes in
quantum gravity. In some cases we expect that they give the dominant
contribution from spacetimes with certain fixed topologies. With negative
cosmological constant, these metrics describe wormholes connecting two
asymptotic regions. We find many examples of such wormhole metrics and for
certain symmetric configurations establish their perturbative stability. We
expect that the Euclidean versions of these wormholes encode the energy level
statistics of AdS black hole microstates. In the de Sitter and flat space
settings we find new homogeneous and isotropic bounce and big bang/crunch
cosmologies. | | Source: | arXiv, 2010.02241 | | Services: | Forum | Review | PDF | Favorites | |
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