Traversable wormholes and nonsingular black holes from the vacuum of quadratic gravity
Abstract
We present new traversable wormhole and nonsingular black hole solutions in pure, scalefree R^{2} gravity. These exotic solutions require no null energy condition violating or "exotic" matter and are supported only by the vacuum of the theory. It is well known that f (R ) theories of gravity may be recast as dual theories in the Einstein frame. The solutions we present are found when the conformal transformation required to move to the dual frame is singular. For quadratic R^{2} gravity, the required conformal factor is identically zero for spacetimes with R =0 . Solutions in this case are argued to arise in the strong coupling limit of general relativity.
 Publication:

Physical Review D
 Pub Date:
 August 2015
 DOI:
 10.1103/PhysRevD.92.043516
 arXiv:
 arXiv:1506.00988
 Bibcode:
 2015PhRvD..92d3516D
 Keywords:

 98.80.Cq;
 Particletheory and fieldtheory models of the early Universe;
 General Relativity and Quantum Cosmology;
 Astrophysics  Cosmology and Nongalactic Astrophysics;
 High Energy Physics  Theory
 EPrint:
 Minor revisions, version to appear in PRD, 8 pages, 3 figures