Stationary BPS Solutions in N = 2 Supergravity with R2-Interactions (2009)
Gabriel Lopes Cardoso, Bernard De Wit, Thomas Mohaupt, Gabriel Lopes Cardoso, Thomas Mohaupt
Preprint typeset in JHEP style.- PAPER VERSION SPIN-00/21 ITP-UU-00/24 SU-ITP 00/19 hep-th/0009234
hep-th/yymmnnn Black Holes in Supergravity and String Theory (2009)
Thomas Mohaupt, Thomas Mohaupt
ABSTRACT We give an elementary introduction to black holes in supergravity and string theory.2 The focus is on the role of BPS solutions in four- and higher-dimensional supergravity and in string...
Instantons, black holes and harmonic functions (2009)
We find a class of five-dimensional Einstein-Maxwell type Lagrangians which contains the bosonic Lagrangians of vector multiplets as a subclass, and preserves some features of supersymmetry, namely...
Special Geometry of Euclidean Supersymmetry III: the local r-map, instantons and black holes (2009)
Cortes, Vicente, Mohaupt, Thomas
We define and study projective special para-Kahler manifolds and show that they appear as target manifolds when reducing five-dimensional vector multiplets coupled to supergravity with respect to...
From Special Geometry to Black Hole Partition Functions (2008)
These notes are based on lectures given at the Erwin-Schrodinger Insitut in Vienna in 2006/07 and at the 2007 School on Attractor Mechanism in Frascati. Lecture I: special geometry from the...
The Erwin, Schrodinger International Boltzmanngasse, Thomas Mohaupt, Thomas Mohaupt
hep-th/yymmnnn
The Erwin, Schrodinger International Boltzmanngasse, Gabriel Lopes Cardoso, Gabriel Lopes Cardoso, Bernard De Wit, Bernard De Wit, ...
Preprint typeset in JHEP style.- PAPER VERSION SPIN-00/21
Non-Perturbative Monodromies In (2007)
Heterotic String, Non-perturbative Monodromies, In N Heterotic, Gabriel Lopes Cardoso, Dieter Lust, Thomas Mohaupt
We address non-perturbative effects and duality symmetries in N = 2 heterotic string theories in four dimensions. Specifically, we consider how each of the four lines of enhanced gauge symmetries in...
Gabriel Lopes Cardoso, Dieter Lust, Thomas Mohaupt
z We discuss recent results on orbifold compactifications including all untwisted moduli, emphasizing the local complex Kahler structure of the moduli space. 1
Special geometry of euclidean supersymmetry II. Hypermultiplets and the $c$-map (2007)
Mayer, Christoph, Mohaupt, Thomas, Saueressig, Frank, Cortés, Vicente
We construct two new versions of the c-map which allow us to obtain the target manifolds of hypermultiplets in euclidean theories with rigid Script $N = 2$ supersymmetry. While the minkowskian...
New developments in special geometry (2006)
We review recent developments in special geometry, emphasizing the role of real coordinates. In the first part we discuss the para-complex geometry of vector and hypermultiplets in rigid Euclidean...
Black hole partition functions and duality (2006)
Cardoso, G. L., De Wit, Bernard, Käppeli, Jürg, Mohaupt, Thomas
The macroscopic entropy and the attractor equations for BPS black holes in four-dimensional N=2 supergravity theories follow from a variational principle for a certain `entropy function'. We present...
Strings, higher curvature corrections, and black holes (2005)
We review old and recent results on subleading contributions to black hole entropy in string theory.
Special geometry of Euclidean supersymmetry II: hypermultiplets and the c-map (2005)
Cortes, Vicente, Mayer, Christoph, Mohaupt, Thomas, Saueressig, Frank
We construct two new versions of the c-map which allow us to obtain the target manifolds of hypermultiplets in Euclidean theories with rigid N =2 supersymmetry. While the Minkowskian para-c-map is...
Conifold Cosmologies in IIA String Theory (2005)
Mohaupt, Thomas, Saueressig, Frank
We discuss the extension of our recent work hep-th/0410272, hep-th/0410273 to general conifold transitions and type-IIA string theory.
Effective Supergravity Actions for Conifold Transitions (2004)
Mohaupt, Thomas, Saueressig, Frank
We construct gauged supergravity actions which describe the dynamics of M-theory on a Calabi-Yau threefold in the vicinity of a conifold transition. The actions explicitly include N charged...
Dynamical Conifold Transitions and Moduli Trapping in M-Theory Cosmology (2004)
Mohaupt, Thomas, Saueressig, Frank
We study five-dimensional Kasner cosmologies in the vicinity of a conifold locus occurring in a time-dependent Calabi-Yau compactification of M-theory. The dynamics of M2-brane winding modes, which...
Domain Walls, Hitchin's Flow Equations and G_2-Manifolds (2004)
Mayer, Christoph, Mohaupt, Thomas
We construct BPS domain wall solutions of the effective action of type-IIA string theory compactified on a half-flat six-manifold. The flow equations for the vector and hypermultiplet scalars are...
Phase Space Analysis of Quintessence Cosmologies with a Double Exponential Potential (2004)
Jarv, Laur, Mohaupt, Thomas, Saueressig, Frank
We use phase space methods to investigate closed, flat, and open Friedmann-Robertson-Walker cosmologies with a scalar potential given by the sum of two exponential terms. The form of the potential is...
Asymptotic degeneracy of dyonic N=4 string states and black hole entropy (2004)
Cardoso, G. L., De Wit, Bernard, Käppeli, Jürg, Mohaupt, Thomas
It is shown that the asymptotic growth of the microscopic degeneracy of BPS dyons in four-dimensional N=4 string theory captures the known corrections to the macroscopic entropy of four-dimensional...
Space-Time Singularities and the Kahler Cone (2003)
Jarv, Laur, Mayer, Christoph, Mohaupt, Thomas, Saueressig, Frank
We review recent results on the interplay between the five-dimensional space-time and the internal manifold in Calabi-Yau compactifications of M-theory. Black string, black hole and domain wall...
Special Geometry of Euclidean Supersymmetry I: Vector Multiplets (2003)
Cortes, Vicente, Mayer, Christoph, Mohaupt, Thomas, Saueressig, Frank
We construct the general action for Abelian vector multiplets in rigid 4-dimensional Euclidean (instead of Minkowskian) N=2 supersymmetry, i.e., over space-times with a positive definite instead of a...
The Kahler Cone as Cosmic Censor (2003)
Mayer, Christoph, Mohaupt, Thomas
M-theory effects prevent five-dimensional domain-wall and black-hole solutions from developing curvature singularities. While so far this analysis was performed for particular models, we now present...
Singular compactifications and cosmology (2003)
Jarv, Laur, Mohaupt, Thomas, Saueressig, Frank
We summarize our recent results of studying five-dimensional Kasner cosmologies in a time-dependent Calabi-Yau compactification of M-theory undergoing a topological flop transition. The dynamics of...
Effective Supergravity Actions for Flop Transitions (2003)
Jarv, Laur, Mohaupt, Thomas, Saueressig, Frank
We construct a family of five-dimensional gauged supergravity actions which describe flop transitions of M-theory compactified on Calabi-Yau threefolds. While the vector multiplet sector can be...
M-theory cosmologies from singular Calabi-Yau compactifications (2003)
Jarv, Laur, Mohaupt, Thomas, Saueressig, Frank
We study five-dimensional Kasner cosmologies in a time-dependent Calabi-Yau compactification of M-theory undergoing a flop transition. The dynamics of the additional states, which become massless at...
Effective Actions near Singularities (2003)
Louis, Jan, Mohaupt, Thomas, Zagermann, Marco
We study the heterotic string compactified on K3 x T^2 near the line T=U, where the effective action becomes singular due to an SU(2) gauge symmetry enhancement. By `integrating in' the light W^\pm...
We study the impact of topological phase transitions of the internal Calabi-Yau threefold on the space-time geometry of five-dimensional extremal black holes and black strings. For flop transitions...
Introduction to String Theory (2002)
We give a pedagogical introduction to string theory, D-branes and p-brane solutions.
Gauged Supergravity and Singular Calabi-Yau Manifolds (2001)
Mohaupt, Thomas, Zagermann, Marco
Compactifications of M-theory on singular manifolds contain additional charged massless states descending from M-branes wrapped on vanishing cycles. We construct the first explicit example of a...
Excision of singularities by stringy domain walls (2001)
Kallosh, Renata, Mohaupt, Thomas, Shmakova, Marina
We study supersymmetric domain walls on S1/Z2 orbifolds. The supergravity solutions in the bulk are given by the attractor equation associated with Calabi–Yau (CY) spaces and have a naked...
Stationary BPS Solutions in $N=2$ Supergravity with $R^2$-Interactions (2000)
Gabriel Lopes Cardoso, Bernard De Wit, Juerg Kaeppeli, Thomas Mohaupt
Stationary BPS Solutions in $N=2$ Supergravity with $R^2$-Interactions (2000)
Gabriel Lopes Cardoso, Bernard De Wit, Juerg Kaeppeli, Thomas Mohaupt
Excision of Singularities by Stringy Domain Walls (2000)
Kallosh, Renata, Mohaupt, Thomas, Shmakova, Marina
We study supersymmetric domain walls on S_1/Z_2 orbifolds. The supergravity solutions in the bulk are given by the attractor equation associated with Calabi-Yau spaces and have a naked space-time...
Black Hole Entropy, Special Geometry and Strings (2000)
We review work done over the last years on the macroscopic and microscopic entropy of supersymmetric black holes in fourdimensional N=2 supergravity and in N=2 compactifications of string theory and...
Black Holes in Supergravity and String Theory (2000)
We give an elementary introduction to black holes in supergravity and string theory. The focus is on BPS solutions in four- and higher-dimensional supergravity and string theory. Basic ideas and...
Macroscopic entropy formulae and non-holomorphic corrections for supersymmetric black holes (2000)
De Wit, Bernard, Cardoso, G. L., Mohaupt, Thomas
In four-dimensional N=2 compactifications of string theory or M-theory, modifications of the Bekenstein-Hawking area law for black hole entropy in the presence of higher-derivative interactions are...
Black Holes in Supergravity and String Theory (2000)
The Erwin, Schrödinger International Boltzmanngasse, Thomas Mohaupt, Thomas Mohaupt
We give an elementary introduction to black holes in supergravity and string theory. 2 The focus is on the role of BPS solutions in four- and higher-dimensional supergravity and in string theory....
Stationary BPS Solutions in N = 2 Supergravity with R 2 –Interactions (2000)
The Erwin, Schrödinger International Boltzmanngasse, Gabriel Lopes Cardoso, Bernard De Wit, Thomas Mohaupt, Gabriel Lopes Cardoso, ...
hep-th/0009234 Stationary BPS Solutions in N = 2 Supergravity with R 2-Interactions
Area law corrections from state counting and supergravity (1999)
Cardoso, Gabriel Lopes, De Wit, Bernard, Mohaupt, Thomas
Modifications of the Bekenstein-Hawking area law for black holes are crucial in order to find agreement between the microscopic entropy based on state counting and the macroscopic entropy based on an...
Macroscopic entropy formulae and non-holomorphic corrections for supersymmetric black holes (1999)
Cardoso, Gabriel Lopes, De Wit, Bernard, Mohaupt, Thomas
In four-dimensional N=2 compactifications of string theory or M-theory, modifications of the Bekenstein-Hawking area law for black hole entropy in the presence of higher-derivative interactions are...
Deviations from the Area Law for Supersymmetric Black Holes (1999)
Cardoso, Gabriel Lopes, De Wit, Bernard, Mohaupt, Thomas
We review modifications of the Bekenstein-Hawking area law for black hole entropy in the presence of higher-derivative interactions. In four-dimensional N=2 compactifications of string theory or...
Area Law Corrections From State Counting and Supergravity (1999)
Gabriel Lopes Cardoso, Bernard De Wit, Thomas Mohaupt
. Modifications of the Bekenstein-Hawking area law for black holes are crucial in order to find agreement between the microscopic entropy based on state counting and the macroscopic entropy based on...
Deviations from the Area Law for Supersymmetric Black Holes (1999)
Gabriel Lopes Cardoso, Bernard De Wit, Thomas Mohaupt
We review modifications of the Bekenstein-Hawking area law for black hole entropy in the presence of higher-derivative interactions. In four-dimensional N = 2 compactifications of string theory or...
Macroscopic Entropy Formulae and Non-Holomorphic Corrections for Supersymmetric Black Holes (1999)
Gabriel Lopes Cardoso, Bernard De Wit, Thomas Mohaupt
In four-dimensional N = 2 compactifications of string theory or M-theory, modifications of the Bekenstein-Hawking area law for black hole entropy in the presence of higher-derivative interactions are...
Corrections to macroscopic supersymmetric black-hole entropy (1998)
Cardoso, Gabriel Lopes, De Wit, Bernard, Mohaupt, Thomas
We determine the corrections to the entropy of extremal black holes arising from terms quadratic in the Riemann tensor in $N=2, D=4$ supergravity theories. We follow Wald's proposal to modify the...
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...
Dual Heterotic Black-Holes in Four and Two Dimensions (1998)
Cardoso, Gabriel Lopes, Mohaupt, Thomas
We consider a class of extremal and non-extremal four-dimensional black-hole solutions occuring in toroidally compactified heterotic string theory, whose ten-dimensional interpretation involves a...
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...
Corrections to Macroscopic Supersymmetric Black-Hole Entropy (1998)
Gabriel Lopes Cardoso, Bernard De Wit, Thomas Mohaupt
We determine the corrections to the entropy of extremal black holes arising from terms quadratic in the Riemann tensor in N = 2; D = 4 supergravity theories. We follow Wald's proposal to modify...
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...
Dual Heterotic Black-Holes in Four and Two Dimensions (1998)
Gabriel Lopes Cardoso, Thomas Mohaupt
We consider a class of extremal and non-extremal four-dimensional black-hole solutions occuring in toroidally compactified heterotic string theory, whose ten-dimensional interpretation involves a...
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...
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...
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...
On the Duality between the Heterotic String and F-Theory in 8 Dimensions (1996)
Cardoso, Gabriel Lopes, Curio, Gottfried, Lust, Dieter, Mohaupt, Thomas
In this note we compare the moduli spaces of the heterotic string compactified on a two-torus and F-Theory compactified on an elliptic K3 surface for the case of an unbroken E8 x E8 gauge group. The...
Modular Symmetries of N=2 Black Holes (1996)
Cardoso, Gabriel Lopes, Lust, Dieter, Mohaupt, Thomas
We discuss the transformation properties of classical extremal N=2 black hole solutions in S-T-U like models under S and T duality. Using invariants of (subgroups of) the triality group, which is the...
De Wit, Bernard, Cardoso, Gabriel Lopes, Lüst, Dieter, Mohaupt, Thomas, Rey, Soo-Jong
The restrictions of target--space duality are imposed at the perturbative level on the holomorphic Wilsonian couplings that encode certain higher-order gravitational interactions in $N=2, D=4$...
Instanton Numbers and Exchange Symmetries in $N=2$ Dual String Pairs (1996)
Cardoso, Gabriel Lopes, Curio, Gottfried, Lüst, Dieter, Mohaupt, Thomas
In this note, we comment on Calabi-Yau spaces with Hodge numbers $h_{1,1}=3$ and $h_{2,1}=243$. We focus on the Calabi-Yau space $WP_{1,1,2,8,12}(24)$ and show how some of its instanton numbers are...
Perturbative and non-perturbative monodromies in N=2 heterotic string vacua (1996)
Cardoso, Gabriel Lopes, Lüst, Dieter, Mohaupt, Thomas
In this talk we summarise our recent results on perturbative and non-perturbative monodromies in four-dimensional heterotic strings with $N=2$ space-time supersymmetry, and we compare our results...
Modular Symmetries Of N=2 Black Holes (1996)
N Black Holes, Dieter Lüst, Gabriel Lopes Cardoso, Thomas Mohaupt
We discuss the transformation properties of classical extremal N = 2 black hole solutions in S-T -U like models under S and T duality. Using invariants of (subgroups of) the triality group, which is...
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...
Perturbative and non-perturbative monodromies in N=2 heterotic string vacua (1996)
Gabriel Lopes Cardoso, Dieter Lüst, Thomas Mohaupt, Weyl Reflections
this paper, only consider the T = U 6= 1; ae
On The Duality Between The Heterotic String And F-Theory In 8 Dimensions (1996)
Gabriel Lopes Cardoso, Gottfried Curio, Dieter Lüst, Thomas Mohaupt
In this note we compare the moduli spaces of the heterotic string compactified on a two--torus and F--Theory compactified on an elliptic K3 surface for the case of an unbroken E 8 \Theta E 8 gauge...
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...
Instanton Numbers and Exchange Symmetries in N=2 Dual String Pairs (1996)
Gabriel Lopes Cardoso, Gottfried Curio, Dieter Lüst, Thomas Mohaupt
In this note, we comment on Calabi-Yau spaces with Hodge numbers h 1;1 = 3 and h 2;1 = 243. We focus on the Calabi-Yau space WP 1;1;2;8;12 (24) and show how some of its instanton numbers are related...
BPS Spectra and Non--Perturbative Couplings in N=2,4 Supersymmetric String Theories (1995)
Cardoso, Gabriel Lopes, Curio, Gottfried, Lust, Dieter, Mohaupt, Thomas, Rey, Soo-Jong
We study the BPS spectrum in $D=4, N=4$ heterotic string compactifications, with some emphasis on intermediate $N=4$ BPS states. These intermediate states, which can become short in $N=2$...
Non-perturbative monodromies in N=2 heterotic string vacua (1995)
Cardoso, Gabriel Lopes, Lüst, Dieter, Mohaupt, Thomas
We address non-perturbative effects and duality symmetries in $N=2$ heterotic string theories in four dimensions. Specifically, we consider how each of the four lines of enhanced gauge symmetries in...
Perturbative and Non-Perturbative Results for N=2 Heterotic Strings (1995)
Gabriel Lopes Cardoso, Dieter Lüst, Thomas Mohaupt
this paper we summarize our recent work about perturbative and non-perturbative effects in four-dimensional heterotic strings with N = 2 space-time supersymmetry. 1. Introduction
Gabriel Lopes Cardoso, Gottfried Curio, Dieter Lüst, Thomas Mohaupt, Soo-jong Rey
We study the BPS spectrum in D = 4; N = 4 heterotic string compactifications, with some emphasis on intermediate N = 4 BPS states. These intermediate states, which can become short in N = 2...
Threshold Corrections and Symmetry Enhancement in String Compactifications (1994)
Cardoso, Gabriel Lopes, Lüst, Dieter, Mohaupt, Thomas
We present the computation of threshold functions for Abelian orbifold compactifications. Specifically, starting from the massive, moduli-dependent string spectrum after compactification, we derive...
Some Results on (0,2) Z_N Orbifold Theories with Continuous Wilson Lines (1994)
Cardoso, Gabriel Lopes, Lust, Dieter, Mohaupt, Thomas
We discuss recent results on orbifold compactifications with (0,2) world sheet supersymmetry and continuous Wilson lines, emphasizing the role of modular symmetries. (This work is a contribution to...
Duality Symmetries and Supersymmetry Breaking in String Compactifications (1994)
Cardoso, G. Lopes, Lust, D., Mohaupt, Thomas
We discuss the spontaneous supersymetry breaking within the low-energy effective supergravity action of four-dimensional superstrings. In particular, we emphasize the non-universality of the soft...
Threshold Corrections And Symmetry Enhancement In String Compactifications (1994)
Gabriel Lopes Cardoso, Dieter Lüst, Thomas Mohaupt
We present the computation of threshold functions for Abelian orbifold compactifications. Specifically, starting from the massive, moduli-dependent string spectrum after compactification, we derive...
Some Results On (0,2) Z_N Orbifold Theories WITH CONTINUOUS WILSON LINES (1994)
Gabriel Lopes Cardoso, DIETER Lüst, Dieter L, Thomas Mohaupt
We discuss recent results on orbifold compactifications with (0,2) world sheet supersymmetry and continuous Wilson lines, emphasizing the role of modular symmetries. 1. Introduction Orbifold...
Orbifold Compactifications with continuous Wilson lines (1993)
We identify the untwisted moduli of heterotic orbifold compactifications for the case, when the gauge twist is realized by a rotation. The Wilson lines are found to have both continuous and discrete...
Orbifold Compactifications with Continuous Wilson Lines (1993)
: We identify the untwisted moduli of heterotic orbifold compactifications for the case, when the gauge twist is realized by a rotation. The Wilson lines are found to have both continuous and...
Critical Wilson Lines in Toroidal Compactifications of Heteroric Strings (1992)
Critical values of Wilson lines and general background fields for toroidal compactifications of heterotic string theories are constructed systematically using Dynkin diagrams.
Critical Wilson Lines in Toroidal Compactifications of Heterotic Strings (1992)
Critical values of Wilson lines and general background fields for toroidal compactifications of heterotic string theories are constructed systematically using Dynkin diagrams. This work is part of a...