Snowmass White Paper: Implications of Quantum Gravity for Particle Physics

TL;DR

This paper reviews how quantum gravity constraints influence particle physics models, affecting topics like the strong CP problem, the weak scale, and cosmology, and discusses their implications for beyond Standard Model theories.

Contribution

It provides a comprehensive review of quantum gravity consistency conditions and explores their phenomenological implications for particle physics and model building.

Findings

Quantum gravity constrains global symmetries in effective field theories.

Implications for solving the strong CP problem and understanding the weak scale.

Guidance for constructing models beyond the Standard Model based on quantum gravity principles.

Abstract

Quantum gravity places important consistency conditions on low-energy effective field theory, such as the absence of global symmetries. These may have important consequences in the search for particle physics beyond the Standard Model. We review some of these conditions and their phenomenological implications for the strong CP problem, the weak scale, new gauge interactions, and cosmology. We also offer some general comments on how these ideas can guide model building.