منابع مشابه
String–string Triality for D = 4, Z 2 Orbifolds †
We investigate the perturbative and non-perturbative correspondence of a class of four dimensional dual string constructions with N = 4 and N = 2 supersymmetry, obtained as Z2 or Z2 × Z2 orbifolds of the type II, heterotic and type I string. In particular, we discuss the heterotic and type I dual of all the symmetric Z2 × Z2 orbifolds of the type II string, classified in Ref. [1]. † Research su...
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Klaus Behrndt, Renata Kallosh, Joachim Rahmfeld, Marina Shmakova, and Wing Kai Wong ∗ Humboldt-Universität, Institut für Physik, Invalidenstraße 110, 10115 Berlin, Germany Physics Department, Stanford University, Stanford, CA 94305-4060 Department of Physics, Texas A&M University , College Station, TX 77843 University of Tennessee, Knoxville, TN 37996 Stanford Linear Accelerator Center, Stanfor...
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The string theory is a fast moving subject, both physics wise and in the respect of mathematics. In order to keep up with the discipline it is important to move with new ideas which are being stressed. Here I wish to give extracts from new papers of ideas which I have recently found interesting. There are six papers which are involved: I ."Strings formulated directly in 4 dimensions " A. N...
متن کاملString Triality, Black Hole Entropy and Cayley's Hyperdeterminant
The four-dimensional N = 2 ST U model of string compactification is invariant under an SL(2, Z) S × SL(2, Z) T × SL(2, Z) U duality acting on the dilaton/axion S, complex Kahler form T and the complex structure fields U, and also under a string/string/string triality S ↔ T ↔ U. The model admits an extremal black hole solution with four electric and four magnetic charges whose entropy must respe...
متن کاملDrill string Vibration Modeling Including Coupling Effects
Abstract: The governing equations of motion for a drill string considering coupling between axial, lateral and torsional vibrations are obtained using a Lagrangian approach. The result leads to a set of non-linear equations with time varying coefficients. A fully coupled model for axial, lateral, and torsional vibrations of drill strings is presented. The bit/formation interactions are assumed ...
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ژورنال
عنوان ژورنال: Journal of High Energy Physics
سال: 2002
ISSN: 1029-8479
DOI: 10.1088/1126-6708/2002/06/041