5 papers
Bosonization versus the Nielsen-Ninomiya theorem
Saif Ullah Baig, Shi Chen, Aleksey Cherman +1
Thanks to bosonization, bosonic lattice models can offer a lattice regularization of chiral fermions. We construct chiral lattice fermion operators in the 2D modified Villain scala…
Does hot QCD have a conformal manifold in the chiral limit?
Shi Chen, Aleksey Cherman, Robert D. Pisarski
Recent lattice evidence may suggest the chiral phase transition in QCD is second order for massless flavors. We constrain conformal field theory (CFT) descriptions of a…
Symmetry theta angles and topological Witten effects
Shi Chen, Aleksey Cherman, Maria Neuzil
We introduce a large class of angles in quantum field theory that we call symmetry angles. Unlike conventional angles whose definition depends on a choice of a path int…
Cheshire terms, Aharonov-Bohm effects, and axions
Shi Chen, Aleksey Cherman, Gongjun Choi +1
We discuss unusual terms that can appear in field theories that allow global vortices. These `Cheshire terms' induce Aharonov-Bohm effects for some particles that move arou…
Generalized BKT Transitions and Persistent Order on the Lattice
Evan Berkowitz, Seth Buesing, Shi Chen +2
The BKT transition in low-dimensional systems with a global symmetry separates a gapless conformal phase from a trivially gapped, disordered phase, and is driven by vortex p…