From effective actions to the background geometry

摘要: Abstract We discuss how the background geometry can be traced from one-loop effective actions in non-supersymmetric theories external Abelian fields. It is shown that upon proper identification of Schwinger parameter Heisenberg–Euler action involves integration over AdS 3 , S and T ∗ geometries, depending on type field. The interpretation selfdual field terms topological strings found corresponding matrix model description suggested. low energy MHV amplitudes are expressed B string mirror to manifold. also make some comments relation between imaginary part branes SU(2) as well contours relevant for path integral.