A bstract The search for a theory of the S-Matrix over the past five decades has revealed
surprising geometric structures underlying scattering amplitudes ranging from the string …

We use Picard-Lefschetz theory to prove a new formula for intersection numbers of twisted
cocycles associated with a given arrangement of hyperplanes. In a special case when this …

A bstract Bondi-Metzner-Sachs (BMS) symmetries, or equivalently Conformal Carroll
symmetries, are intrinsically associated to null manifolds and in two dimensions can be …

A bstract We revisit the relations between open and closed string scattering amplitudes
discovered by Kawai, Lewellen, and Tye (KLT). We show that they emerge from the un …

A bstract We study the bosonic sector of a decoupling limit of type IIA superstring theory,
where a background Ramond-Ramond one-form is fined tuned to its critical value, such that …

A bstract We further develop the string 1/c 2 expansion of closed bosonic string theory,
where c is the speed of light. The expansion will be performed up to and including the next …

A bstract Conformal Carroll symmetry generically arises on null manifolds and is important
for holography of asymptotically flat spacetimes, generic black hole horizons and …

We study and extend the duality web unifying different decoupling limits of type II superstring
theories and M theory. We systematically build connections to different corners, such as …

We review different exact approaches to string theory. In the context of the Green–Schwarz
superstring, we discuss the action in curved backgrounds and its supercoset formulation …

The BMS (Bondi–van der Burg–Metzner–Sachs) symmetry arises as the asymptotic
symmetry of flat spacetime at null infinity. In particular, the BMS algebra for three …