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...
Partition function of dyonic black holes in N=4 string theory (2006)
The dominant contribution to the semicanonical partition function of dyonic black holes of N = 4 string theory is computed for generic charges, generalizing recent results of Shih and Yin. The result...
Käppeli, Jürg, Theisen, Stefan, Vanhove, Pierre
We study four-dimensional compactifications of type II superstrings on Calabi-Yau spaces in the hybrid formalism. Chiral and twisted-chiral interactions are rederived, which involve the coupling of...
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...
Stationary Configurations and Geodesic Description of Supersymmetric Black Holes (2003)
This thesis contains a detailed study of various properties of supersymmetric black holes. In chapter I an overview over some of the fascinating aspects of black hole physics is provided. In...
Spacetime diffeomorphisms and the geodesic approximation (2002)
We present a spacetime diffeomorphism invariant formulation of the geodesic approximation to soliton dynamics.
On a gauge invariant description of soliton dynamics (2002)
De Wit, Bernard, Käppeli, Jürg
We present important elements of a gauge and diffeomorphism invariant formulation of the moduli space approximation to soliton dynamics. We argue that explicit velocity-dependent modifications are...
A note on topological amplitudes in hybrid string theory
Käppeli, Jürg, Theisen, Stefan, Vanhove, P.
We study four-dimensional compactifications of type II superstrings on Calabi-Yau spaces using the formalism of hybrid string theory. Chiral and twisted-chiral interactions are rederived, which...