Holomorphic Couplings in String Theory
Jan Louis, Kristin Foerger

TL;DR
This paper reviews the properties of holomorphic couplings in the effective actions of 4D N=1 and N=2 string vacua, emphasizing their role in dualities among different string theories.
Contribution
It provides a comprehensive overview of holomorphic couplings in string theory and their significance in establishing dualities between various string vacua.
Findings
Holomorphic couplings characterize effective actions in string vacua.
Duality relations are supported by properties of these couplings.
The review clarifies the role of holomorphic couplings in string dualities.
Abstract
In these lectures we review the properties of holomorphic couplings in the effective action of four-dimensional N=1 and N=2 closed string vacua. We briefly outline their role in establishing a duality among (classes of) different string vacua. (Lectures presented by J. Louis at the Trieste Spring School 1996.)
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