String loop corrections to the universal hypermultiplet

Details String loop corrections to the universal hypermultiplet String loop corrections to the universal hypermultiplet

2003-07-28

arxiv.org/abs/hep-th/0307268v2

Class.Quant.Grav.20:5079-5102,2003

Physics

High Energy Physics

High Energy Physics - Theory

30 pages, harvmac, 1 figure. v2: minor typos corrected. Version to appear in Classical and Quantum Gravity

Scientific paper

10.1088/0264-9381/20/23/009

We study loop corrections to the universal dilaton supermultiplet for type IIA strings compactified on Calabi-Yau threefolds. We show that the corresponding quaternionic kinetic terms receive non-trivial one-loop contributions proportional to the Euler number of the Calabi-Yau manifold, while the higher-loop corrections can be absorbed by field redefinitions. The corrected metric is no longer Kahler. Our analysis implies in particular that the Calabi-Yau volume is renormalized by loop effects which are present even in higher orders, while there are also one-loop corrections to the Bianchi identities for the NS and RR field strengths.

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