Gauduchon-Tod structures, Sim holonomy and De Sitter supergravity (2009)
Grover, Jai, Gutowski, Jan B., Herdeiro, Carlos A. R., Meessen, Patrick, Palomo-Lozano, Alberto, Sabra, Wafic A.
Solutions of five-dimensional De Sitter supergravity admitting Killing spinors are considered, using spinorial geometry techniques. It is shown that the "null" solutions are defined in terms of a one...
Isometries of Half Supersymmetric Time-Like Solutions In Five Dimensions (2008)
Gutowski, Jan B., Sabra, Wafic A.
Spinorial geometry techniques have recently been used to classify all half supersymmetric solutions in gauged five dimensional supergravity with vector multiplets. In this paper we consider solutions...
Hamilton-Jacobi Counterterms for Einstein-Gauss-Bonnet Gravity (2008)
Liu, James T., Sabra, Wafic A.
The on-shell gravitational action and the boundary stress tensor are essential ingredients in the study of black hole thermodynamics. We employ the Hamilton-Jacobi method to calculate the boundary...
Half-Supersymmetric Solutions in Five-Dimensional Supergravity (2007)
Gutowski, Jan B., Sabra, Wafic A.
We present a systematic classification of half-supersymmetric solutions of gauged N=2, D=5 supergravity coupled to an arbitrary number of abelian vector multiplets for which at least one of the...
Maximally Minimal Preons in Four Dimensions (2006)
Grover, Jai, Gutowski, Jan B., Sabra, Wafic A.
Killing spinors of N=2, D=4 supergravity are examined using the spinorial geometry method, in which spinors are written as differential forms. By making use of methods developed in hep-th/0606049 to...
Non-Supersymmetric Charged Domain Walls (2006)
Gutowski, Jan B., Sabra, Wafic A.
We present general non-supersymmtric domain wall solutions with non-trivial scalar and gauge fields for gauged five-dimensional N=2 supergravity coupled to abelian vector multiplets.
Black hole mass and Hamilton-Jacobi counterterms (2005)
Batrachenko, Alexey, Liu, James T., McNees, Robert, Sabra, Wafic A., Wen, Wen Yu
We apply the method of holographic renormalization to computing black hole masses in asymptotically anti-de Sitter spaces. In particular, we demonstrate that the Hamilton-Jacobi approach to obtaining...
Consistent reductions of IIB */M * theory and de Sitter supergravity (2004)
Liu, James T., Wen, Wen-Yu, Sabra, Wafic A.
We construct consistent non-linear Kaluza Klein reduction ansatze for a subset of fields arising from the reduction of IIB * and M * theory on dS5 × H5 and dS4 × AdS7, respectively. These...
Cacciatori, Sergio L., Klemm, Dietmar, Sabra, Wafic A.
We present new supersymmetric domain wall and string solutions of five-dimensional N = 2 gauged supergravity coupled to an arbitrary number of vector multiplets. Using the techniques of very special...
A Supersymmetric Solution in N=2 Gauged Supergravity with the Universal Hypermultiplet (2001)
Gutperle, Michael, Sabra, Wafic A.
We present supersymmetric solutions for the theory of gauged supergravity in five dimensions obtained by gauging the shift symmetry of the axion of the universal hypermultiplet. This gauged theory...
Black Holes and Flop Transitions in M-Theory on Calabi-Yau Threefolds (1998)
Gaida, Ingo, Mahapatra, Swapna, Mohaupt, Thomas, Sabra, Wafic A.
We present fivedimensional extreme black hole solutions of M-theory compactified on Calabi-Yau threefolds and study these solutions in the context of flop transitions in the extended Kahler cone. In...
Higher-Order Black-Hole Solutions in N=2 Supergravity and Calabi-Yau String Backgrounds (1998)
Behrndt, Klaus, Cardoso, Gabriel Lopes, De Wit, Bernard, Lüst, Dieter, Mohaupt, Thomas, Sabra, Wafic A.
Based on special geometry, we consider corrections to N=2 extremal black-hole solutions and their entropies originating from higher-order derivative terms in N=2 supergravity. These corrections are...
Black Holes and Flop Transitions in M-Theory on Calabi-Yau Threefolds (1998)
Ingo Gaida, Swapna Mahapatra, Thomas Mohaupt, Wafic A. Sabra
We present fivedimensional extreme black hole solutions of M-theory compactified on Calabi-Yau threefolds and study these solutions in the context of flop transitions in the extended Kahler cone. In...
Higher-Order Black-Hole Solutions in N = 2 Supergravity and Calabi-Yau String Backgrounds (1998)
Klaus Behrndt, Gabriel Lopes Cardoso, Bernard De Wit, Thomas Mohaupt, Dieter Lust, Wafic A. Sabra
Based on special geometry, we consider corrections to N = 2 extremal blackhole solutions and their entropies originating from higher-order derivative terms in N = 2 supergravity. These corrections...
The entropy of near-extreme N=2 black holes (1997)
Behrndt, Klaus, Cvetic, Mirjam, Sabra, Wafic A.
We give an explicit form of the classical entropy for four-dimensional static near-BPS-saturated black holes of generic N=2 superstring vacua. The expression is obtained by determining the leading...
Behrndt, Klaus, Lust, Dieter, Sabra, Wafic A.
In this paper we discuss compactifications of type II superstrings where the moduli of the internal Calabi-Yau space vary over four-dimensional space time. The corresponding solutions of...
Stationary solutions of N=2 supergravity (1997)
Behrndt, Klaus, Lust, Dieter, Sabra, Wafic. A.
We discuss general bosonic stationary configurations of N=2, D=4 supergravity coupled to vector multiplets. The requirement of unbroken supersymmetries imposes constraints on the holomorphic...
Duality Invariant Magnetohydrodynamics And Dyons (1996)
Coceal, Omduth, Sabra, Wafic A., Thomas, Steven
The theory of magnetohydrodynamics is extended to the cases of a plasma of separate magnetic and electric charges, as well as to a plasma of dyons respectively. In both these cases the system...