I'm studying the moduli space of vacua for some supersymmetric gauge theory and I want to know specifically why it is important to know the geometry of this space. I know everything about the division between Higgs branch and Coulomb branch for a gauge theory, I know that the moduli space is a Kahler manifold and I know you can see the moduli space as a complex algebraic variety (or better affine variety). What I would like to better understand is what is the physical reason that brings us to think to the geometry of the moduli space? Why don't we just try to find out the properties of the moduli space of vacua just looking at a Lagrangian density? Is it then if a theory has no Lagrangian you can understand it anyway just looking at the geometry of the space?
Where can I find some good review or book where is explicitly written the importance of the geometry of the moduli space in order to understand the physics of a supersymmetric gauge theory?
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