Zobrazeno 1 - 10
of 132
pro vyhledávání: '"Behrndt, Klaus"'
Autor:
Behrndt, Klaus
Publikováno v:
Fortsch.Phys. 54 (2006) 275-281
In this talk, I will summarize recent developments in 5-dimensional supergravity. Apart from black ring solutions, we will discuss the way of obtaining regular (bubbling) solutions with the same charges as black holes. We outline the procedure for th
Externí odkaz:
http://arxiv.org/abs/hep-th/0601088
Publikováno v:
Nucl.Phys.B749:25-68,2006
We present a comprehensive classification of supersymmetric vacua of M-theory compactification on seven-dimensional manifolds with general four-form fluxes. We analyze the cases where the resulting four-dimensional vacua have N = 1,2,3,4 supersymmetr
Externí odkaz:
http://arxiv.org/abs/hep-th/0512032
Publikováno v:
Nucl.Phys. B732 (2006) 200-223
Based on recent proposals linking four and five-dimensional BPS solutions, we discuss the explicit dictionary between general stationary 4D and 5D supersymmetric solutions in N=2 supergravity theories with cubic prepotentials. All these solutions are
Externí odkaz:
http://arxiv.org/abs/hep-th/0506251
Autor:
Behrndt, Klaus
Publikováno v:
AIP Conf.Proc. 743 (2005) 251-268; Fortsch.Phys. 53 (2005) 861-865
In order to lift the continuous moduli space of string vacua, non-trivial fluxes may be the essential input. In this talk I summarize aspects of two approaches to compactifications in the presence of fluxes: (i) generalized Scherk-Schwarz reductions
Externí odkaz:
http://arxiv.org/abs/hep-th/0503129
Publikováno v:
Nucl.Phys.B721:287-308,2005
A supersymmetric vacuum has to obey a set of constraints on fluxes as well as first order differential equations defined by the G-structures of the internal manifold. We solve these equations for type IIB supergravity with SU(3) structures. The 6-dim
Externí odkaz:
http://arxiv.org/abs/hep-th/0502154
Autor:
Behrndt, Klaus, Cvetic, Mirjam
Publikováno v:
Nucl.Phys.B708:45-71,2005
We study conditions on general fluxes of massive Type IIA supergravity that lead to four-dimensional backgrounds with N = 1 supersymmetry. We derive these conditions in the case of SU(3)- as well as SU(2)-structures. SU(3)-structures imply that the i
Externí odkaz:
http://arxiv.org/abs/hep-th/0407263
Autor:
Behrndt, Klaus, Jeschek, Claus
We consider compactifications of M-theory on 7-manifolds in the presence of 4-form fluxes, which leave at least four supercharges unbroken. Supersymmetric vacua admit G-structures and we discuss the cases of G_2-, SU(3)- as well as SU(2)-structures.
Externí odkaz:
http://arxiv.org/abs/hep-th/0406138
Autor:
Behrndt, Klaus, Cvetic, Mirjam
Publikováno v:
Phys.Rev.Lett.95:021601,2005
We derive conditions for the existence of four-dimensional \N=1 supersymmetric flux vacua of massive type IIA string theory with general supergravity fluxes turned on. For an SU(3) singlet Killing spinor, we show that such flux vacua exist only when
Externí odkaz:
http://arxiv.org/abs/hep-th/0403049
Autor:
Behrndt, Klaus, Klemm, Dietmar
Publikováno v:
Class.Quant.Grav. 21 (2004) 4107-4122
We discuss supersymmetric black holes embedded in a Goedel-type universe with cosmological constant in five dimensions. The spacetime is a fibration over a four-dimensional Kaehler base manifold, and generically has closed timelike curves. Asymptotic
Externí odkaz:
http://arxiv.org/abs/hep-th/0401239
Autor:
Behrndt, Klaus, Jeschek, Claus
Publikováno v:
Class.Quant.Grav.21:S1533-1538,2004
In flux compactifications of M-theory a superpotential is generated whose explicit form depends on the structure group of the 7-dimensional internal manifold. In this note, we discuss superpotentials for the structure groups: G_2, SU(3) or SU(2). For
Externí odkaz:
http://arxiv.org/abs/hep-th/0401019