The Gopakumar–Vafa invariants are a set of mathematical constructs in the field of algebraic geometry and theoretical physics, introduced by Rajesh Gopakumar and Cumrun Vafa. They provide a count of certain geometrical objects called curves on a Calabi-Yau threefold. Specifically, these invariants are related toso-called "BPS states" in string theory, particularly in the context of the compactification of string theory on Calabi-Yau manifolds.
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