Schwarzschild geometry counterpart in semiclassical gravity

DOI: 
10.1103/PhysRevD.101.064059
Publication date: 
02/06/2020
Main author: 
Arrechea J.
IAA authors: 
Arrechea, J.;Barceló, C.
Authors: 
Arrechea J., Barceló C., Carballo-Rubio R., Garay L.J.
Journal: 
Physical Review D
Refereed: 
Yes
Publication type: 
Article
Volume: 
101.0
Pages: 
064059
Number: 
064059
Abstract: 
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 nonvacuum region. © 2020 American Physical Society.
Database: 
SCOPUS
ADS
URL: 
https://ui.adsabs.harvard.edu/#abs/2020PhRvD.101f4059A/abstract
ADS Bibcode: 
2020PhRvD.101f4059A