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23 papers · 2 filters
Quadratic Effective Action for QED in D=2,3 Dimensions
D. Dalmazi, A. de Souza Dutra, Marcelo Hott
We calculate the effective action for Quantum Electrodynamics (QED) in D=2,3 dimensions at the quadratic approximation in the gauge fields. We analyse the analytic structure of the…
Non-commutative Unification in Brane World
Zurab Kakushadze
We point out that in (open) string compactifications with non-zero NS-NS B-field we can have large Kaluza-Klein thresholds even in the small volume limit. In this limit the corresp…
Consistency of the reduction and the origin of self-duality in odd dimensions
Horatiu Nastase, Diana Vaman, Peter van Niewenhuizen
We discuss the full nonlinear Kaluza-Klein (KK) reduction of the original formulation of d=11 supergravity on to gauged maximal ({\cal N}=4) supergravity in 7 dim…
Renormalization of Quantum Field Theories on Noncommutative R^d, I. Scalars
Iouri Chepelev, Radu Roiban
A noncommutative Feynman graph is a ribbon graph and can be drawn on a genus 2-surface with a boundary. We formulate a general convergence theorem for the noncommutative Feynma…
Solution of the quantum inverse problem
F. Göhmann, V. E. Korepin
We derive a formula that expresses the local spin and field operators of fundamental graded models in terms of the elements of the monodromy matrix. This formula is a quantum analo…
Quantization and Scattering in the IIB SL(2,Z) Covariant Superstring
Gordon Chalmers, Koenraad Schalm
We rewrite the SL(2,Z) covariant worldsheet action for the IIB string proposed by Townsend in a Polyakov form. In a flat background the formalism yields separate (p,q) sectors. In…