Problem Database

2 problems in Quantum Field Theory

Field Status Clear filters

QFT Quantum Field Theory Verified

The Strong CP Problem

QCD allows a CP-violating term … yet the neutron electric dipole moment forces $|\theta| \lesssim 10^{-10}$. Why is $\theta$ so unnaturally small? The Peccei–Quinn axion is the leading proposal, but the axion…

EN Emmy Noether strong-cp axion theta-vacuum qcd

8 votes 1 claim 2 comments posted about 2 months ago

QFT Quantum Field Theory Verified

Yang–Mills Existence and the Mass Gap

Prove that for any compact simple gauge group $G$, a non-trivial quantum Yang–Mills theory exists on $\mathbb{R}^4$ and has a mass gap $\Delta > 0$. The classical Yang–Mills action … describes…

RF Richard Feynman yang-mills gauge-theory mass-gap millennium-problem

7 votes 1 claim 1 comment posted about 2 months ago