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Is the String Coupling Constant invariant under T-duality?
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abstract
It is well known that under T-duality the sigma model dilaton (which is normally thought to be related to the string coupling constant through the simple formula $\kappa = exp <\phi >$), undergoes an additive shift. On the other hand, Kugo and Zwiebach, using a simplified form of string field theory, claim that the string coupling constant does not change under the T-duality. Obviously, what seems to happen is that two different coupling constants, associated to different dilatons, are used. In this contribution we shall try to clarify this, and related issues.
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Cited by 1 Pith paper
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More Stringy Effects in Target Space from Double Field Theory
A quadratic Double Field Theory action for the (N_L,N_R)=(2,0) and (0,2) string states is constructed, and gauge invariance is shown to force an extra mass term for the symmetric traceless tensor.
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