TASI Lectures: (No) Global Symmetries to Axion Physics

Abstract

These notes are an expanded version of lectures given at the 2022 TASI summer school in Boulder, Colorado. One goal of these lecture notes is to (partially) bridge the gap between what one learns in typical introductory quantum field theory classes and what one needs to understand to follow modern developments in particle theory beyond the Standard Model. Topics covered include global and gauge symmetries, charge quantization, instantons, chiral anomalies, the Strong CP problem, axion models from 4d and from higher dimensions, the expected absence of global symmetries in quantum gravity, and some phenomenological implications thereof. If these topics seem to be at best loosely related, I hope that reading the notes will convince you otherwise. Recent developments in quantum field theory have shown that ordinary gauge theories exhibit a much wider range of (generalized) global symmetries than were previously understood, while recent work in quantum gravity has provided sharper arguments that global symmetries should not exist. This sets up an interesting tension, the resolution of which can have implications for particle physics in the real world. Axion physics is one setting in which these ideas can guide phenomenology. The TASI audience comprised particle phenomenology students whom I hoped to convince of the importance of learning more about quantum field theory and quantum gravity. These notes may also be of interest to formal theory readers seeking closer connections to realworld particle physics.

Axion domain walls, small instantons, and non-invertible symmetry breaking

“…This is also consistent with the expectation that in general non-invertible symmetries, like all global symmetries, are accidental (see e.g. [35] for a discussion in the context of axions). In this case, the degeneracy will be lifted by an exponentially small amount by loops of virtual monopoles or, equivalently, through small instanton contributions from the UV gauge group [23,36].…”

Out of the dark: WISPs in String Theory and the Early Universe

“…The potential for the strong CP problem of QCD to be solved through the existence of an axion has been recognised for a long time (a good broad overview of axion physics is given by [3]). Viewed from the perspective of 4-dimensional quantum field theory, the defining characteristic of an axion is its periodicity in field space.…”

Cosmology of axion dark matter

“…In this review I am remaining agnostic about the high-scale origins of the axion, whatever they may be, so I will not get much further into this issue. I refer you to these excellent notes by Reece [75] for more discussion.…”