Black Holes and Rings of minimal 5-dim. Supergravity (2006)
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...
Classification of Supersymmetric Flux Vacua in M Theory (2006)
Behrndt, Klaus, Cvetic, Mirjam, Liu, Tao
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...
Classification of Supersymmetric Flux Vacua in M Theory (2005)
Behrndt, Klaus, Cvetic, Mirjam, Liu, Tao
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...
Exploring the relation between 4D and 5D BPS solutions (2005)
Behrndt, Klaus, Cardoso, Gabriel Lopes, Mahapatra, Swapna
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...
Stabilization of moduli by fluxes (2005)
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...
General N = 1 Supersymmetric Fluxes in (Massive) Type IIA String Theory (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...
General Type IIB Fluxes with SU(3) Structures (2005)
Behrndt, Klaus, Cvetic, Mirjam, Gao, Peng
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...
General N = 1 Supersymmetric Fluxes in (Massive) Type IIA String Theory (2005)
Behrndt, Klaus, Cvetic, Mirjam
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...
General N = 1 Supersymmetric Fluxes in Massive Type IIA String Theory (2004)
Behrndt, Klaus, Cvetic, Mirjam
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...
Fluxes in M-theory on 7-manifolds: G_2-, SU(3)- and SU(2)-structures (2004)
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...
Superpotentials from flux compactifications of M-theory (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...
General N = 1 Supersymmetric Flux Vacua of (Massive) Type IIA String Theory (2004)
Behrndt, Klaus, Cvetic, Mirjam
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...
Black holes in Goedel-type universes with a cosmological constant (2004)
Behrndt, Klaus, Klemm, Dietmar
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...
Superpotentials from flux compactifications of M-theory (2004)
Behrndt, Klaus, Jeschek, Claus
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...
Supersymmetric Intersecting D6-Branes and Fluxes in Massive Type IIA String Theory (2004)
We study N=1 supersymmetric four-dimensional solutions of massive Type IIA supergravity with intersecting D6-branes in the presence NS-NS three-form fluxes. We derive N=1 supersymmetry conditions for...
Fluxes in M-theory on 7-manifolds: G-structures and Superpotential (2004)
We consider compactifications of M-theory on 7-manifolds in the presence of 4-form fluxes, which leave at least four supercharges unbroken. We focus especially on the case, where the 7-manifold...
De Sitter vacua from N=2 gauged supergravity (2004)
Behrndt,Klaus, Mahapatra,Swapna
Typical de Sitter (dS) vacua of gauged supergravity correspond to saddle points of the potential and often the unstable mode runs into a singularity. We explore the possibility to obtain dS points...
Black holes in Gödel type universes with a cosmological constant (2004)
We discuss supersymmetric black holes embedded in a Gödel-type universe with cosmological constant in five dimensions. The spacetime is a fibration over a four-dimensional Kähler base manifold, and...
Supersymmetric Intersecting D6-Branes and Fluxes in Massive Type IIA String Theory (2004)
Behrndt, Klaus, Cvetic, Mirjam
We study N=1 supersymmetric four-dimensional solutions of massive Type IIA supergravity with intersecting D6-branes in the presence NS-NS three-form fluxes. We derive N=1 supersymmetry conditions for...
Fluxes in M-theory on 7-manifolds: G-structures and Superpotential (2004)
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. We focus especially on the case, where the 7-manifold...
De Sitter vacua from N=2 gauged supergravity (2004)
Behrndt, Klaus, Mahapatra, Swapna
Typical de Sitter (dS) vacua of gauged supergravity correspond to saddle points of the potential and often the unstable mode runs into a singularity. We explore the possibility to obtain dS points...
Superpotentials from flux compactifications of M-theory (2004)
Behrndt, Klaus, Jeschek, Claus
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...
Black holes in Gödel type universes with a cosmological constant (2004)
Behrndt, Klaus, Klemm, Dietmar
We discuss supersymmetric black holes embedded in a Gödel-type universe with cosmological constant in five dimensions. The spacetime is a fibration over a four-dimensional Kähler base manifold, and...
De Sitter vacua from N=2 gauged supergravity (2003)
Behrndt, Klaus, Mahapatra, Swapna
Typical de Sitter (dS) vacua of gauged supergravity correspond to saddle points of the potential and often the unstable mode runs into a singularity. We explore the possibility to obtain dS points...
Fluxes in M-theory on 7-manifolds: G-structures and Superpotential (2003)
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. We focus especially on the case, where the 7-manifold...
Chronological structure of a Goedel type universe with negative cosmological constant (2003)
Behrndt, Klaus, Pössel, Markus
We show that the Goedel solution of five-dimensional gauged supergravity contains either closed time-like curves through every space-time point or none at all, dependent on the rotational parameter....
Supersymmetric Intersecting D6-branes and Fluxes in Massive Type IIA String Theory (2003)
Behrndt, Klaus, Cvetic, Mirjam
We study N=1 supersymmetric four-dimensional solutions of massive Type IIA supergravity with intersecting D6-branes in the presence NS-NS three-form fluxes. We derive N=1 supersymmetry conditions for...
Time-dependent backgrounds from supergravity with gauged non-compact R-symmetry (2003)
Behrndt, Klaus, Cvetic, Mirjam
We obtain a general class of time-dependent, asymptotically de Sitter backgrounds which solve the first order bosonic equations that extremize the action for supergravity with gauged non-compact...
Fluxes in M-theory on 7-manifolds and G structures (2003)
Behrndt, Klaus, Jeschek, Claus
We consider warp compactifications of M-theory on 7-manifolds in the presence of 4-form fluxes and investigate the constraints imposed by supersymmetry. As long as the 7-manifold supports only one...
Intersecting branes from 7-manifolds with G_2 holonomy (2003)
In this talk I discuss intersecting brane configurations coming from explicit metrics with G_2 holonomy. An example of a 7-manifold which representing a R^3 bundle over a self-dual Einstein space is...
Fluxes in M-theory on 7-manifolds and G structures (2003)
We consider warp compactifications of M-theory on 7-manifolds in the presence of 4-form fluxes and investigate the constraints imposed by supersymmetry. As long as the 7-manifold supports only one...
Time-dependent backgrounds from supergravity with gauged non-compact R-symmetry (2003)
We obtain a general class of time-dependent, asymptotically de Sitter backgrounds which solve the first order bosonic equations that extremize the action for supergravity with gauged non-compact...
Chronological structure of a Goedel type universe with negative cosmological constant (2003)
We show that the Goedel solution of five-dimensional gauged supergravity contains either closed time-like curves through every space-time point or none at all, dependent on the rotational parameter....
Intersecting branes and 7-manifolds with G2 holonomy (2003)
In this talk I discuss intersecting brane configurations coming from explicit metrics with G2 holonomy. An example of a 7-manifold which representing a R3 bundle over a self-dual Einstein space is...
Fluxes in M-theory on 7-manifolds and G structures (2003)
Behrndt, Klaus, Jeschek, Claus
We consider warp compactifications of M-theory on 7-manifolds in the presence of 4-form fluxes and investigate the constraints imposed by supersymmetry. As long as the 7-manifold supports only one...
Time-dependent backgrounds from supergravity with gauged non-compact R-symmetry (2003)
Behrndt, Klaus, Cvetic, Mirjam
We obtain a general class of time-dependent, asymptotically de Sitter backgrounds which solve the first order bosonic equations that extremize the action for supergravity with gauged non-compact...
Chronological structure of a Goedel type universe with negative cosmological constant (2003)
Behrndt, Klaus, Pössel, Markus
We show that the Goedel solution of five-dimensional gauged supergravity contains either closed time-like curves through every space-time point or none at all, dependent on the rotational parameter....
Intersecting 6-branes from new 7-manifolds with G(2) holonomy (2002)
Behrndt,Klaus, Dall Agata,Gianguido, Lüst,Dieter, Mahapatra,Swapna
We discuss a new family of metrics of 7-manifolds with G(2) holonomy, which are R-3 bundles over a quaternionic space. The metrics depend on five parameters and have two abelian isometries. Certain...
Singular 7-manifolds with G_2 holonomy and intersecting 6-branes (2002)
A 7-manifold with G_2 holonomy can be constructed as a R^3 bundle over a quaternionic space. We consider a quaternionic base space which is singular and its metric depends on three parameters, where...
Bent BPS domain walls of D=5 N=2 gauged supergravity coupled to hypermultiplets (2002)
Behrndt, Klaus, Cvetic, Mirjam
Within D=5 N=2 gauged supergravity coupled to hypermultiplets we derive consistency conditions for BPS domain walls with constant negative curvature on the wall. For such wall solutions to exist, the...
Singular 7-manifolds with G(2) holonomy and intersecting 6-branes (2002)
A 7-manifold with G(2) holonomy can be constructed as a R-3 bundle over a quaternionic space. We consider a quaternionic base space which is singular and its metric depends on three parameters, where...
Intersecting 6-branes from new 7-manifolds with G(2) holonomy (2002)
Behrndt, Klaus, Dall Agata, Gianguido, Lüst, Dieter, Mahapatra, Swapna
We discuss a new family of metrics of 7-manifolds with G(2) holonomy, which are R-3 bundles over a quaternionic space. The metrics depend on five parameters and have two abelian isometries. Certain...
Vacua of N=2 gauged supergravity derived from non-homogeneous quaternionic spaces (2001)
Behrndt, Klaus, Dall'Agata, Gianguido
We discuss a class of 4-dimensional non-homogeneous quaternionic spaces, which become the two known homogeneous spaces (EAdS_4$ and SU(2,1)/U(2)) in certain limits. These moduli spaces have two...
Curved BPS domain wall solutions in four-dimensional N=2 supergravity (2001)
Behrndt, Klaus, Cardoso, Gabriel Lopes, Lust, Dieter
We construct four-dimensional domain wall solutions of N=2 gauged supergravity coupled to vector and to hypermultiplets. The gauged supergravity theories that we consider are obtained by performing...
Domain walls and flow equations in supergravity (2001)
Domain wall solutions have attracted much attention due to their relevance for brane world scenarios and the holographic RG flow. In this talk I discuss the following aspects for these applications:...
Domain Walls, Black Holes, and Supersymmetric Quantum Mechanics (2001)
Behrndt, Klaus, Gukov, Sergei, Shmakova, Marina
Supersymmetric solutions, such as BPS domain walls or black holes, in four- and five-dimensional supergravity theories with eight supercharges can be described by effective quantum mechanics with a...
Gauging of N=2 Supergravity Hypermultiplet and Novel Renormalization Group Flows (2001)
Behrndt, Klaus, Cvetic, Mirjam
We provide the explicit gauging of all the SU(2,1) isometries of one N=2 supergravity hypermultiplet, which spans SU(2,1)/U(2) coset space parameterized in terms of two complex projective coordinate...
Domain walls in five dimensional supergravity with non-trivial hypermultiplets (2001)
Behrndt, Klaus, Herrmann, Carl, Louis, Jan, Thomas, Steven
We study BPS domain wall solutions of 5-dimensional N = 2 supergravity where isometries of the hypermultiplet geometry have been gauged. We derive the corresponding supersymmetric flow equations and...
Domain walls in five dimensional supergravity with non-trivial hypermultiplets (2000)
Behrndt, Klaus, Herrmann, Carl, Louis, Jan, Thomas, Steven
We study BPS domain wall solutions of 5-dimensional N=2 supergravity where isometries of the hypermultiplet geometry have been gauged. We derive the corresponding supersymmetric flow equations and...
Infra-red fixed points at the boundary (2000)
Behrndt, Klaus, Cvetič, Mirjam
Gauged supergravities (in four and five dimensions) with eight supercharges and with vector supermultiplets have a unique ultra-violet (UV) fixed point on a given physical domain Script M of the...
A non-singular infra-red flow from D=5 gauged supergravity (2000)
We discuss domain wall solutions of 5-dimensional supergravity corresponding to a cosine-superpotential, which is derived by a gauging of the two Abelian isometries of the scalar coset SU(2,1)/U(2)....
Infra-red fixed points at the boundary (2000)
Behrndt, Klaus, Cvetic, Mirjam
Gauged supergravities (in four and five dimensions) with eight supercharges and with vector supermultiplets have a unique ultra-violet (UV) fixed point on a given physical domain \cal M of the space...
Anti-deSitter Vacua of Gauged Supergravities with 8 Supercharges (2000)
Behrndt, Klaus, Cvetic, Mirjam
We investigate supersymmetric extrema of Abelian gauged supergravity theories with non-trivial vector multiplets and 8 supercharges in four and five dimensions. The scalar fields of these models...
Domain Walls and Superpotentials from M Theory on Calabi-Yau Three-Folds (2000)
Compactification of M theory in the presence of G-fluxes yields N=2 five-dimensional gauged supergravity with a potential that lifts all supersymmetric vacua. We derive the effective superpotential...
Supersymmetric Domain-Wall World from D=5 Simple Gauged Supergravity (1999)
Behrndt, Klaus, Cvetic, Mirjam
We address a supersymmetric embedding of domain walls with asymptotically anti-deSitter (AdS) space-times in five-dimensional simple, N=2 U(1) gauged supergravity theory constructed by Gunaydin,...
Domain walls of D=5 supergravity and fixed points of N=1 Super Yang Mills (1999)
Employing the AdS/CFT correspondence, we give an explicit supergravity picture for the renormalization group flow of couplings 4-d super Yang Mills with four supercharges. The solution represents a...
On Domain-Wall/QFT Dualities in Various Dimensions (1999)
Behrndt, Klaus, Bergshoeff, Eric, Halbersma, Rein, Van Der Schaar, Jan Pieter
We investigate domain-wall/quantum field theory correspondences in various dimensions. Our general analysis does not only cover the well-studied cases in ten and eleven dimensions but also enables us...
Branes, Waves and AdS Orbifolds (1999)
The embedding of a Taub-NUT space in the directions transverse to the world volume of branes describes branes at (spherical) orbifold singularities. Similarly, the embedding of a pp-wave in the brane...
On domain-wall/QFT dualities in various dimensions (1999)
Halbersma, Rein, Bergshoeff, Eric, Behrndt, Klaus
We investigate domain-wall/quantum field-theory correspondences in various dimensions. Our general analysis covers not only the well studied cases in 10 and 11 dimensions, but also enables us to...
Orbifolds of AdS(3) and fixpoints of the CFT (1998)
The 3-d BTZ black hole represents an orbifold of $AdS_3$ gravity. The UV as well as the IR region of the CFT is governed by a gauged SL(2, R) WZW model. In the UV it corresponds to a light-cone...
AdS gravity and field theories at fixpoints (1998)
The renormalization group flow of the worldvolume theory depends very much from the number of unbroken supersymmetries. In the dual $AdS$ picture we break supersymmetry by adding different types of...
AdS_3 Gravity and Conformal Field Theories (1998)
Behrndt, Klaus, Brunner, Ilka, Gaida, Ingo
We present a detailed analysis of $AdS_3$ gravity, the BTZ black hole and the associated conformal field theories (CFTs). In particular we focus on the non-extreme six-dimensional string solution...
Entropy and Conformal Field Theories of AdS_3 Models (1998)
Behrndt, Klaus, Brunner, Ilka, Gaida, Ingo
We present a derivation of the Bekenstein-Hawking entropy from conformal field theories. In particular we consider a six-dimensional string configuration with background metric AdS_3 * S^3 near the...
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...
Branes in N=2,D=4 sugra and the conformal field theory limit (1998)
In this article we summarise the brane solutions (instantons, black holes and strings) in 4 dimensions when embedded in N=2 supergravity. Like in 10 dimensions these solutions are related by duality...
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...
Entropy of bound states in the matrix description of M5-branes (1997)
Like the M-theory itself also the worldvolume theory of the M5-brane contains brane excitations, which can be extracted from the supersymmetry algebra. Bound states (intersecting branes) of the...
On central charges and the entropy in matrix theory (1997)
The Bekenstein-Hawking entropy of BPS black holes can be obtained as the minimum of the mass (= largest central charge). In this letter we investigate the analog procedure for the matrix model of...
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...
From Type IIA Black Holes to T-dual Type IIB D-Instantons in N=2, D=4 Supergravity (1997)
Behrndt, Klaus, Gaida, Ingo, Lust, Dieter, Mahapatra, Swapna, Mohaupt, Thomas
We discuss the T-duality between the solutions of type IIA versus IIB superstrings compactified on Calabi-Yau threefolds. Within the context of the N=2, D=4 supergravity effective Lagrangian, the...
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...
Instanton effects in string cosmology (1997)
Behrndt, Klaus, Forste, Stefan, Schwager, Stefan
We consider the gauge dyonic string solution of the K3 compactified heterotic string theory in a four dimensional cosmological context. Since for this solution Green-Schwarz as well as Chern-Simons...
BPS-Saturated Bound States of Tilted P-Branes in Type II String Theory (1997)
Behrndt, Klaus, Cvetic, Mirjam
We found BPS-saturated solutions of M-theory and Type II string theory which correspond to (non-marginally) bound states of p-branes intersecting at angles different from pi/2. These solutions are...
We present subleading corrections to the N=2 supersymmetric black hole entropy. These subleading contributions correspond to instanton corrections of the Type II string theory. In particular we...
Classical and quantum aspects of 4 dimensional black holes (1997)
In this talk I address some aspects in the recent developments for N=2 black holes in 4 dimensions. I restrict myself on axion-free solutions that can classically be related to intersections of...
Intersecting D-branes in ten and six dimensions (1997)
Janssen, Bert, Bergshoeff, Eric, Behrndt, Klaus
We show how, via T duality, intersecting D brane configurations in ten (six) dimensions can be obtained from the elementary D-brane configurations by embedding a type IIB D-brane into a type IIB...
From Type IIA Black Holes to T-dual Type IIB D-Instantons in N = 2, D = 4 Supergravity (1997)
In N, D Supergravity, Dieter Lüst, Klaus Behrndt, Ingo Gaida, Swapna Mahapatra, ...
We discuss the T-duality between the solutions of type IIA versus IIB superstrings compactified on Calabi-Yau threefolds. Within the context of the N = 2, D = 4 supergravity effective Lagrangian, the...
Decompactification near the horizon and non-vanishing entropy (1996)
Intersecting D-brane configurations are related to black holes in D=4. Using the standard way of compactification only the Reissner-Nordstr{\o}m black hole is non-singular. In this paper we argue,...
Entropy of N=2 black holes and their M-brane description (1996)
Behrndt, Klaus, Mohaupt, Thomas
In this paper we discuss the M-brane description for a N=2 black hole. This solution is a result of the compactification of M-5-brane configurations over a Calabi-Yau threefold with arbitrary...
Quantum corrections for D=4 black holes and D=5 strings (1996)
In recent times quantum corrections for N=2 black holes in 4 dimensions have been addressed in the framework of double extreme black hole solutions, which are characterised by constant scalar fields....
STU Black Holes and String Triality (1996)
Behrndt, Klaus, Kallosh, Renata, Rahmfeld, Joachim, Shmakova, Marina, Wong, Wing Kai
We find double-extreme black holes associated with the special geometry of the Calabi-Yau moduli space with the prepotential F=STU. The area formula is STU-moduli independent and has ${[SL(2,Z)]}^3$...
Intersecting D-Branes in ten and six dimensions (1996)
Behrndt, Klaus, Bergshoeff, Eric, Janssen, Bert
We show how, via $T$-duality, intersecting $D$-Brane configurations in ten (six) dimensions can be obtained from the elementary $D$-Brane configurations by embedding a Type IIB $D$-Brane into a Type...
Behrndt, Klaus, Kallosh, Renata
Supersymmetric monopoles of the heterotic string theory associated with arbitrary non-negative number of the left moving modes of the string states are presented. They include H monopoles and their T...
Type II duality symmetries in six dimensions (1996)
Janssen, Bert, Bergshoeff, E., Behrndt, Klaus
We discuss the different discrete duality symmetries in six dimensions that act within and between (i) the 10-dimensional heterotic string compactified on T^4, (ii) the 10-dimensional type IIA string...
Intersecting D-branes and black hole entropy (1996)
Bergshoeff, Eric, Behrndt, Klaus
In four dimensions there are 4 different types of extremal Maxwell/scalar black holes characterized by a scalar coupling parameter a with a = 0, 1/√3, 1, √3. These black holes can be described as...
Entropy of N = 2 black holes and their M-brane description (1996)
In this paper we discuss the M-brane description for a N = 2 black hole. This solution is a result of the compactification of M-5-brane configurations over a CalabiYau threefold with arbitrary...
Classical And Quantum N = 2 Supersymmetric Black Holes (1996)
Black Holes, Klaus Behrndt, Gabriel Lopes Cardoso, Bernard De Wit, Dieter Lüst, Renata Kallosh, ...
We use heterotic/type-II prepotentials to study quantum/classical black holes with half the N = 2; D = 4 supersymmetries unbroken. We show that, in the case of heterotic string compactifications, the...
O(6,22) BPS Configurations of the Heterotic String (1995)
Behrndt, Klaus, Kallosh, Renata
We present a static multi-center magnetic solution of toroidally compactified heterotic string theory, which is T-duality covariant. The space-time geometry depends on the mass M and on the...
The 10-D chiral null model and the relation to 4-D string solutions (1994)
The chiral null model is a generalization of the fundamental string and gravitational wave background. It is an example of a conformally invariant model in all orders in $\alpha'$ and has unbroken...
Berlin, Humboldt-Univ., Diss., 1991 (Nicht für den Austausch).