Theses
Bootstrapping Large-Nc QCD and String Amplitudes
by
→
Europe/Madrid
IFAE Seminar Room
IFAE Seminar Room
Description
Abstract
Is nature defined by a few fundamental principles? How much can consistency requirements alone carve out a physical theory? The bootstrap program takes these questions literally: rather than building amplitudes from a Lagrangian, it asks which theories are even allowed to exist once unitarity, causality, and symmetry are imposed, and lets the physics fall out as a consequence. This thesis applies this logic to two different physical setups. The first is large-Nc QCD, where consistency sharpens what the low-energy theory of pions is permitted to look like. The second is quantum gravity, where the same demands prove remarkably rigid, pinning down which amplitudes can exist at all, and dictating the spectrum a consistent theory is forced to contain.