TL;DR
This paper compares M-theory and automorphic scattering with string theory, showing how eleven-dimensional supergravity emerges at strong coupling and offers an off-shell description of strings through dimensional reduction.
Contribution
It demonstrates the connection between M-theory, automorphic scattering, and eleven-dimensional supergravity, highlighting the off-shell string description via dimensional reduction.
Findings
M-theory at strong coupling reduces to eleven-dimensional supergravity.
Supergravity provides an off-shell description of string theory.
Automorphic construction relates to the graviton S-matrix.
Abstract
The strongly coupled limit of string scattering and the automorphic construction of the graviton S-matrix is compared with the eleven dimensional formulation of M-theory. In a particular scaling limit at strong string coupling, M-theory is described by eleven-dimensional supergravity which does not possess a dilaton, but rather a perturbative expansion in the gravitational coupling and derivatives. The latter theory provides an off-shell description of the string, upon dimensional reduction.
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