The Partition Function in the Four-Dimensional Schwarz-type Topological Half-Flat Two-Form Gravity

We derive the partition functions of the Schwarz-type four-dimensional topological half-flat 2-form gravity model on K3-surface or T^4 up to on-shell one-loop corrections. In this model the bosonic moduli spaces describe an equivalent class of a trio of the Einstein-K\"ahler forms (the hyperk\"ahler forms). The integrand of the partition function is represented by the product of some $\bar \partial$-torsions.