Is the String Coupling Constant invariant under T-duality?

Details Is the String Coupling Constant invariant under T-duality? Is the String Coupling Constant invariant under T-duality?

1996-10-07

arxiv.org/abs/hep-th/9610032v1

Nucl.Phys.Proc.Suppl. 57 (1997) 44-51

Physics

High Energy Physics

High Energy Physics - Theory

LaTeX, 13 pag. Contributions to Santa Margherita and S. Petersburg meetings

Scientific paper

10.1016/S0920-5632(97)00352-6

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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