%0 Journal Article %T Topological conformal field theories and gauge theories %A Kevin J. Costello %J Mathematics %D 2006 %I arXiv %R 10.2140/gt.2007.11.1539 %X This paper gives a construction, using heat kernels, of differential forms on the moduli space of metrised ribbon graphs, or equivalently on the moduli space of Riemann surfaces with boundary. The construction depends on a manifold with a bundle of Frobenius algebras, satisfying various conditions. These forms satisfy gluing conditions which mean they form an open topological conformal field theory, i.e. a kind of open string theory. If the integral of these forms converged, it would yield the purely quantum part of the partition function of a Chern-Simons type gauge theory. Yang-Mills theory on a four manifold arises as one of these Chern-Simons type gauge theories. %U http://arxiv.org/abs/math/0605647v5