Computing the R^4 term at two Superstring Loops
高能物理 - 理论
2009-11-07 v1
摘要
We use a previously derived integral representation for the four graviton amplitude at two loops in Superstring theory, whose leading term for vanishing momenta gives the two-loop contribution to the R^4 term in the Effective Action. We find by an explicit computation that this contribution is zero, in agreement with a general argument implying the vanishing of the R^4 term beyond one loop.
引用
@article{arxiv.hep-th/0202058,
title = {Computing the R^4 term at two Superstring Loops},
author = {Roberto Iengo},
journal= {arXiv preprint arXiv:hep-th/0202058},
year = {2009}
}
备注
6 pages, Latex