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Schwarzschild geometry counterpart in semiclassical gravity

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arxiv 1911.03213 v2 pith:TVEGIWZF submitted 2019-11-08 gr-qc hep-th

Schwarzschild geometry counterpart in semiclassical gravity

Julio Arrechea , Carlos Barcel\'o , Ra\'ul Carballo-Rubio , Luis J. Garay This is my paper
classification gr-qc hep-th
keywords rsetvacuumpolyakovregionregularizedsemiclassicalcounterpartfield
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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We investigate the effects of vacuum polarization on vacuum static spherically-symmetric spacetimes. We start from the Polyakov approximation to the renormalized stress-energy tensor (RSET) of a minimally coupled massless scalar field. This RSET is not regular at $r=0$, so we define a regularized version of the Polyakov RSET. Using this Regularized RSET, and under the previous symmetry assumptions, we find all the solutions to the semiclassical field equations in vacuum. The resulting counterpart to the Schwarzschild classical geometry substitutes the presence of an event horizon by a wormhole throat that connects an external asymptotically flat region with an internal asymptotic region possessing a naked singularity: there are no semiclassical vacuum solutions with well-defined Cauchy surfaces. We also show that the Regularized Polyakov RSET allows for wormhole geometries of arbitrarily small throat radius. This analysis paves the way to future investigations of proper stellar configurations with an internal non-vacuum region.

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Cited by 3 Pith papers

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