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hep-th2007
Strings as sigma models and in the tensionless limit
Jonas Persson
This thesis considers two different aspects of string theory, the tensionless limit of the string and supersymmetric sigma models. The tensionless limit is used to find a IIB super…
hep-th2005
First-order supersymmetric sigma models and target space geometry
Andreas Bredthauer, Ulf Lindstrom, Jonas Persson
We study the conditions under which N=(1,1) generalized sigma models support an extension to N=(2,2). The enhanced supersymmetry is related to the target space complex geometry. Co…
hep-th2004
Type IIB tensionless superstrings in a pp-wave background
Andreas Bredthauer, Ulf Lindstrom, Jonas Persson +1
We solve the tensionless string in a constant plane wave background and obtain a hugely degenerate spectrum. This is the case for a large class of plane wave backgrounds. We show t…