Speaker
Mr.
Pavel Korolyov
(PFUR, Moscow)
Description
S.V. Bolokhov, K.A. Bronnikov, P.A. Korolyov, M.V. Skvortsova
We construct explicit examples of globally regular static, spherically
symmetric solutions in general relativity with scalar and electromagnetic
fields, describing (1) traversable wormholes with flat and AdS asymptotics
and (2) regular black holes, in particular, black universes. (A black universe
is a regular black hole with an expanding, asymptotically isotropic
space-time beyond the horizon.) The existence of such objects requires
invoking scalars with negative kinetic energy (``phantoms'', or ``ghosts''),
which are not observed under usual physical conditions. To account for that,
the so-called ``trapped ghosts'' were previously introduced, i.e., scalars
whose kinetic energy is only negative in a restricted strong-field region
of space-time and positive outside it. This approach leads to certain
problems, including instability (as we illustrate by derivation
of an effective potential for spherical pertubations of such systems).
To avoid that, we use for model construction what we call ``invisible
ghosts'', i.e., phantom scalar fields sufficiently rapidly decaying in the
weak-field region. The resulting configurations contain different numbers
of Killing horizons, from zero to four. Their global structure has been
studied with the aid of Carter-Penrose diagrams.
| Presentation type | Section talk (10+5 min) |
|---|
Primary author
Prof.
Kirill Bronnikov
(VNIIMS)
Co-authors
Dr.
Milena Skvortsova
(VNIIMS, Moscow)
Mr.
Pavel Korolyov
(PFUR, Moscow)
Dr.
Sergei Bolokhov
(PFUR, Moscow)
