A simple model of 4d-TQFT

We show that, associated with any complex root of unity \omega, there exists a particularly simple 4d-TQFT model M_\omega defined on the cobordism category of Delta complexes. For an oriented closed 4-manifold X of Euler characteristic \chi(X), it is conjectured that the quantity N^{3\chi(X)/2}M_\omega(X), where N is the order of... Show more