Vacuum and semiclassical gravity: a difficulty and its bewildering significance

Details Vacuum and semiclassical gravity: a difficulty and its bewildering significance Vacuum and semiclassical gravity: a difficulty and its bewildering significance

2007-09-18

arxiv.org/abs/0709.2741v1

PoSQG-Ph:004,2007

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

11 pages, LaTeX, 4 figure; talk given at the workshop "From Quantum to Emergent Gravity: Theory and Phenomenology", June, 11-1

Scientific paper

We review a long-standing difficulty in some semiclassical models of vacuum and vacuum decay. Surprisingly enough these models, careless of their transparent formulation, are affected by, both, technical and conceptual issues. After proving some general results that are relevant for, both, the Euclidean and Lorentzian sectors of their dynamics, we briefly highlight their importance in connection with the issues discussed before, arguing that their solution might be interesting in our quest for quantum gravity.

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