Abstract
The low energy effective couplings of a four-dimensional mathcal{N} = 2 supersymmetric gauge theory to topological invariants of the background gravitational field are described by two functions A and B. These two functions play an important role in the study of topo- logically twisted four-dimensional mathcal{N} = 2 supersymmetric gauge theories and in the computation of central charges of mathcal{N} = 2 superconformal theories. In this paper, we compute A and B from the partition function in the Ω-background for SU(2) gauge theories. Our results not only confirm the predicted expressions of the effective gravitational couplings, but also give the previously undetermined overall multiplicative factors. We also analyze A and B for the SU(N ) super-Yang-Mills theory, and confirm all the previous predictions.
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