A-theory - A brane world-volume theory with manifest U-duality

In this paper, the A-theory, an extension of F-theory, is described as a fully U-duality covariant brane theory. This theory has some distinguishing features not known from world-sheet models. In particular, seen as a sigma model, both world-volume and tar-get space coordinates are specific representations of the same group (the U-duality group).The U-duality group in question is an exceptional group (a split form of the E(d )series).The structure of this group allows it to encompass both the T-duality group of string theory as well as the general linear symmetry group of M-theory. A-theory is defined by the current algebras in Hamiltonian formalism, or by world-volume actions in Lagrangian formalism. The spacetime coordinates are self dual gauge fields on the world-volume, requiring the Gau ss law constraints tying the world-volume to spacetime. Solving the Gau ss law constraints/the Virasoro constraints gives the world-volume/spacetime sectioning from A-theory to T-theory/M-theory respectively. The A-theory Lagrangian admits extended symmetry which has not been observed previously in the literature, where the background fields include both the spacetime and the world-volume gravitational fields. We also con-structed the four-point amplitude of A-theory in the low energy limit. The amplitude is written in a way that the U-duality symmetry is manifest, but after solving the section condition, it reduces to the usual four-graviton amplitude.In the previous papers, we have referred to this model as F-theory, however, F-theory initiated by Vafa is now a big branch of string theory as the study of elliptic fibrations, so we refer to these constructions as generalized models of theory for all dimensions with all duality symmetries as A-theory.