We study the space of open string effective field theories by combining the

constraint of unitarity and monodromy relations for the four-point amplitude.

The latter is a reflection of an underlying disk correlator with singularities at the

boundary. By assuming maximal SUSY, the resulting bootstrap isolates Wilson

coefficients to at least 10^{−4} of the Type-I superstring. Furthermore, utilizing our

geometric approach, we obtain the critical dimension of 10 from the low energy

coefficients alone. Remarkably, relaxing SUSY but requiring the massless states

to carry four-dimensional helicities, the Wilson coefficients are again constrained

to superstring values within 10^{−4}. Thus we conclude that type-I string theory

is the unique solution to the monodromy bootstrap with either maximal susy

or vector external states. We also introduce Tachyons to the bootstrap and

demonstrate for the scattering of external vectors, the bosonic and superstring

span the allowed region. Allowed regions for closed string effective field theories

are obtained by implementing the KLT relations.

# Particle Theory Seminar - Li-Yuan Chiang - “Bootstrapping String Theory EFT”

Event time:

Tuesday, January 30, 2024 - 4:00pm to 5:00pm

Location:

Sloane Physics Laboratory (SPL), Room 48

217 Prospect Street

New Haven, CT
06511
Event description:

Contact:

Kirstin Franzman