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Calendar of Physics Talks Vienna
| Black holes with internal structure and avoidance of singularities |
| Speaker: | Diego Rubiera-Garcia (Lisbon) |
| Abstract: | We consider black hole geometries in metric-affine
extensions of GR, where no a priori constraint between metric and
connection is introduced. Working with several gravitational actions
we show that this formulation of modified gravity yields ghost-free
and second-order field equations of motion. When applied to
electrovacuum space-times, the point-like singularity of GR is
generically replaced by a internal, finite-size structure with the
same properties as a wormhole. Though curvature divergences may arise
at the wormhole throat, we show the geodesically complete character
of these space-times. The regularity of these space-times is further
discussed in terms of congruence of geodesics and scattering of waves
off the wormhole. |
| Date: | Fri, 17.06.2016 |
| Time: | 13:00 |
| Duration: | 60 min |
| Location: | Seminar room DB gelb 03, 3rd floor, TU Wien, Wiedner Hauptstr. 8-10, 1040 Vienna |
| Contact: | Daniel Grumiller and Johanna Knapp |
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