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21 papers · 2 filters
On the relation between Euclidean and Lorentzian 2D quantum gravity
J. Ambjorn, J. Correia, C. Kristjansen +1
Starting from 2D Euclidean quantum gravity, we show that one recovers 2D Lorentzian quantum gravity by removing all baby universes. Using a peeling procedure to decompose the discr…
Fundamental strings in Dp-Dq brane systems
J. Froehlich, O. Grandjean, A. Recknagel +1
We study conformal field theory correlation functions relevant for string diagrams with open strings that stretch between several parallel branes of different dimensions. In the fr…
On first order formulations of supergravities
B. Julia, S. Silva
Supergravities are usually presented in a so-called 1.5 order formulation. Here we present a general scheme to derive pure 1^{st} order formulations of supergravities from the 1.5…
On the Duality between Perturbative Heterotic Orbifolds and M-Theory on T^4/Z_N
V. Kaplunovsky, J. Sonnenschein, S. Theisen +1
The heterotic string compactified on an orbifold $T^4/\IZ_N$ has gauge group with (massless) states in its twisted sectors which are charged under both…
A Hiker's Guide to K3 - Aspects of N=(4,4) Superconformal Field Theory with central charge c=6
W. Nahm, K. Wendland
We study the moduli space of N=(4,4) superconformal field theories with central charge c=6. After a slight emendation of its global description we find the locations of…
Duality Induced Reflections and CPT
Heinrich Saller
The linear particle-antiparticle conjugation $\ty C$ and position space reflection $\ty P$ as well as the antilinear time reflection $\ty T$ are shown to be inducable by the selfdu…