 As application to string theory, the famous OSV conjecture used "Hitchin functional" in order to relate topological string to 4-dimensional black hole entropy.Using similar technique in the formula_16 holonomy argued about topological M-theory and in the formula_17 holonomy topological F-theory might be argued.More recently, E. Witten claimed the mysterious superconformal field theory in six dimensions, called 6D (2,0) superconformal field theory .