[Todos] [IAFE]Coloquio 22/5 a las 14:00hs : Black holes ...

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                          COLOQUIOS EN EL IAFE
              Instituto de Astronomía y Física del Espacio
                              CONICET-UBA
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           "Black holes, parallelizable horizons and half-BPS states for
                 the Einstein-Gauss-Bonnet theory in five dimensions"

                Jueves 22 de mayo 2008, 14:00hs
            Aula del Edificio IAFE - Ciudad Universitaria

                         Alex Giacomini
         Centro de Estudios Científicos, Validivia (Chile)

Abstract:
Exact vacuum solutions with a nontrivial torsion for the
Einstein-Gauss-Bonnet theory in five dimensions are constructed. We
consider a class of static metrics whose spacelike section is a warped
product of the real line with a nontrivial base manifold endowed with a
fully antisymmetric torsion. It is shown requiring solutions of this sort
to exist, fixes the Gauss-Bonnet coupling such that the Lagrangian can be
written as a Chern-Simons form. The metric describes black holes with an
arbitrary, but fixed, base manifold. It is shown that requiring its
ground state to possess unbroken supersymmetries, fixes the base manifold
to be locally a parallelized three-sphere. The ground state turns out to
be half-BPS, which could not be achieved in the absence of torsion in
vacuum. The Killing spinors are explicitly found.

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Instituto de Astronomía y Física del Espacio
CC 67 - Suc 28 (1428) Capital, Argentina
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