String theory

We explore dualities and solution-generating transformations in various contexts. Our focus is on the T-duality invariant form of supergravity known as double fi eld theory, the SL(5)-invariant M-theory extended geometry, and metrics dual under the fluid/gravity correspondence t…

We argue that a theoretical upper bound exists on the cutoff of any effective theory that describes an electromagnetically interacting massive higher spin field in at space. The cutoff is a simple function of the particle's mass, spin and electric charge, and cannot be arbitrari…