Effective field theory bootstrap, large-N χPT and holographic QCD
Yue-Zhou Li
Abstract
A bstract We review the effective field theory (EFT) bootstrap by formulating it as an infinite-dimensional semidefinite program (SDP), built from the crossing symmetric sum rules and the S-matrix primal ansatz. We apply the program to study the large- N chiral perturbation theory ( χ PT) and observe excellent convergence of EFT bounds between the dual (rule-out) and primal (rule-in) methods. This convergence aligns with the predictions of duality theory in SDP, enabling us to analyze the bound states and resonances in the ultra-violet (UV) spectrum. Furthermore, we incorporate the upper bound of unitarity to uniformly constrain the EFT space from the UV scale M using the primal method, thereby confirming the consistency of the large- N expansion. In the end, we translate the large- N χ PT bounds to constrain the higher derivative corrections of holographic QCD models.