منابع مشابه
String Network from M-theory
We study the three string junctions and string networks in Type IIB string theory by explicity constructing the holomorphic embeddings of the M-theory membrane that describe such configurations. The main feature of them such as supersymmetry, charge conservation and balance of tensions are derived in a more unified manner. We calculate the energy of the string junction and show that there is no...
متن کاملAccelerating cosmologies from M/String theory compactifications
We point out that the solution of (4 + n)-dimensional gravity coupled to the dilaton and an n-form field strength can give rise to a flat 4-dimensional universe (with a scale factor) of the type proposed recently under time dependent compactifications. The compact internal spaces could be hyperbolic, flat or spherical and the solution is identical to the space-like two brane or S2-brane. We sho...
متن کاملString/M Theory
This is a brief review of the present status, of some recent developments and of the open challenges in string/M theory.† 1. Why string theory The main claim of string theory is that it cures the singular short-distance behaviour of Einstein gravity, without giving up the fundamental laws of quantum mechanics. Although this is far from established, there are serious indications that the claim c...
متن کاملDEVELOPMENT IN STRING THEORY
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 کاملMassive String Theories from M-theory and F-theory
The massive IIA string theory whose low energy limit is the massive super-gravity theory constructed by Romans is obtained from M-theory compactified on a 2-torus bundle over a circle in a limit in which the volume of the bundle shrinks to zero. The massive string theories in 9-dimensions given by Scherk-Schwarz reduction of IIB string theory are interpreted as F-theory compactified on 2-torus ...
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ژورنال
عنوان ژورنال: Nuclear Physics B
سال: 1998
ISSN: 0550-3213
DOI: 10.1016/s0550-3213(98)00062-5