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22 papers · 2 filters
Asymptotic degeneracy of dyonic N=4 string states and black hole entropy
G. L. Cardoso, B. de Wit, J. Käppeli +1
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…
Complex curves and non-perturbative effects in c=1 string theory
Sergei Alexandrov
We investigate a complex curve in the string theory which provides a geometric interpretation for different kinds of D-branes. The curve is constructed for a theory perturbed…
Time-dependent backgrounds of 2D string theory: Non-perturbative effects
Sergei Yu. Alexandrov, Ivan K. Kostov
We study the non-perturbative corrections (NPC) to the partition function of a compactified 2D string theory in a time-dependent background generated by a tachyon source. The sine-…
Non-extremal instantons and wormholes in string theory
E. Bergshoeff, A. Collinucci, U. Gran +2
We construct the most general non-extremal spherically symmetric instanton solution of a gravity-dilaton-axion system with symmetry, for arbitrary euclidean spacetime dim…
The maximal D=5 supergravities
Bernard de Wit, Henning Samtleben, Mario Trigiante
The general Lagrangian for maximal supergravity in five spacetime dimensions is presented with vector potentials in the \bar{27} and tensor fields in the 27 representation of E_6.…
Semiclassical Universe from First Principles
J. Ambjorn, J. Jurkiewicz, R. Loll
Causal Dynamical Triangulations in four dimensions provide a background-independent definition of the sum over space-time geometries in nonperturbative quantum gravity. We show tha…