First-principle simulations of 1+1d quantum field theories at $\theta =\pi$ and spin-chains

Tin Sulejmanpasic, Daniel Daniel Göschl, Christof Gattringer

We present a lattice study of a 2-flavor $U(1)$ gauge-Higgs model quantum field theory with a topological term at $\theta =\pi$. Such studies are prohibitively costly in the standard latti…