Opportunities in Neutrino Theory -- a Snowmass White Paper

TL;DR

This white paper discusses key open questions and research opportunities in neutrino theory, emphasizing their connection to ongoing experimental efforts and the state of the theoretical community.

Contribution

It highlights the most pressing questions in neutrino theory and their links to current and future experimental programs worldwide.

Findings

Neutrino masses indicate physics beyond the standard model

Many open questions remain about the neutrino sector

Current experimental programs are crucial for advancing understanding

Abstract

Neutrino masses are clear evidence for physics beyond the standard model and much more remains to be understood about the neutrino sector. We highlight some of the outstanding questions and research opportunities in neutrino theory. We show that most of these questions are directly connected to the very rich experimental program currently being pursued (or at least under serious consideration) in the United States and worldwide. Finally, we also comment on the state of the theoretical neutrino physics community in the U.S.