# What is the significance of self-duality and anti self-duality in supergravity?

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So I see the terms "self-dual" and "anti self-dual" appear routinely in supergravity/string thery, e.g. the fact that Type IIB supergravity contains a real self-dual rank-5 antisymmetric tensor $F_{\hat{\mu}_1, \ldots, \hat{\mu}_5}$ (hats denote 10 dimensional indices). I have also read that these things are important in studying Type IIB supergravity on $S^5$.

1. What is the physical implication of self-duality, or anti-self-duality?

2. What is the connection to group theory (where sometimes you have to include a factor of 1/2 in counting the dimensions of irreducible representations in the Young Tableaux, when you encounter self-dual or anti-self dual tensors)?

This post imported from StackExchange Physics at 2015-05-10 11:27 (UTC), posted by SE-user leastaction