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Instanton corrections to the effective action of N=4 SYM | | Massimo Bianchi
; Jose Francisco Morales
; Congkao Wen
; | | Date: |
3 Aug 2015 | | Abstract: | We compute the one-instanton effective action of N=4 super Yang-Mills theory
with gauge group Sp(2N). The result can be written in a very compact and
manifestly supersymmetric form involving an integral over the superspace of an
irrational function of N=4 on-shell superfields. In the Coulomb branch, the
instanton corrects both the MHV and next-to-next-MHV gluon couplings
D^4F^{2n+2} and F^{2n+4} as well as their super-symmetrically related partners.
We confirm at the non-perturbative level the non-renormalization theorems for
MHV couplings F^{2n+2} that are expected to receive perturbative corrections
only at n-loops. We compute also the one and two-loop corrections to the D^4F^4
coupling and show that its completion under SL(2,Z) duality is consistent with
the one-instanton results of U(2) gauge group. | | Source: | arXiv, 1508.0554 | | Services: | Forum | Review | PDF | Favorites | |
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