BSM

Abstract

An "axiverse" is a generic prediction of string theory, although the axions are typically extremely hard to detect, and sometimes may not actually solve the strong CP problem. I shall discuss how the axiverse is realised in the LARGE volume scenario, including what the axion couplings are, whether they can be detected, how the QCD axion can arise - and also how to build models with an additional axion-like particle that could explain some intriguing astrophysical anomalies.