The 37th International Symposium on Lattice Field Theory (Lattice 2019)

Session

Applications Beyond QCD

21 Jun 2019, 16:10

Conveners

Applications Beyond QCD

• Benjamin Svetitsky (Tel Aviv University)

142. Lattice Analysis of SU(2) with 1 Adjoint Dirac Flavor

Anthony Grebe (Massachusetts Institute of Technology)

21/06/2019, 16:10

Applications Beyond QCD

Parallel

In some proposed condensed matter systems, SU(2) with one massless adjoint Dirac quark flavor emerges as an effective theory of the critical point. Condensed matter theorists Bi and Senthil have conjectured that a composite fermion composed of two quarks and an antiquark becomes massless and non-interacting as the quark mass goes to zero, whereas the other particles in the theory all have...

197. Lattice study of the 2-flavor U(1) gauge Higgs model at topological angle $\theta=\pi$

Daniel Göschl (University of Graz)

21/06/2019, 16:30

Applications Beyond QCD

Parallel

We study the 2-d $U(1)$ gauge Higgs model with 2 flavors on the lattice. We simulate at topological angle $\theta=\pi$ and overcome the sign problem with a worldline representation of the theory. Using a novel definition of the theta-term, in terms of a Villain-type action, gives rise to a lattice discretization of the topological charge as an integer and thus, exactly implements the charge...

242. Quantum Critical Phenomena in an O(4) Fermion Chain

Hanqing Liu (Duke University)

21/06/2019, 16:50

Applications Beyond QCD

Parallel

We construct an interacting spin $\frac{1}{2}$ fermion model with an $O(4)$ symmetry, motivated by the ability to study its physics using the meron cluster algorithm. By adding a strong repulsive Hubbard interaction $U$, we can transform it into the regular Heisenberg anti-ferromagnet. While we can study our model in any dimension, as a first project we study it in one spatial dimension. We...