English

Critical scaling in the $N=1$ Thirring Model in $(2+1)d$

High Energy Physics - Lattice 2026-01-23 v1

Abstract

The Thirring model in 2+1dd with NN Dirac flavors can exhibit spontaneous U(2N)2N)\toU(N)N)\otimesU(NN) breaking through fermion - antifermion condensation in the limit m0m\to0. With no small parameter in play the symmetry-breaking dynamics is strongly-interacting and quantitative work requires a fermion formulation accurately capturing global symmetries. We present simulation results for N=1N=1 obtained with Wilson kernel domain wall fermions on 163×Ls16^3\times L_s, with Ls=24,,120L_s=24,\ldots,120. The LsL_s\to\infty extrapolation of the bilinear condensate ψˉψ\langle\bar\psi\psi\rangle as a function of coupling and bare mass is fitted to an empirical equation of state; the resulting critical exponents are significantly altered from previously obtained values, and for the first time resemble those emerging from analytic predictions based on approximate solutions to Schwinger-Dyson equations, consistent with a putative UV-stable renormalisation group fixed point. To address the non-perturbative issue of the value NcN_c below which such a fixed point exists we present preliminary results obtained with N=2N=2.

Keywords

Cite

@article{arxiv.2601.16051,
  title  = {Critical scaling in the $N=1$ Thirring Model in $(2+1)d$},
  author = {Simon Hands and Jude Worthy},
  journal= {arXiv preprint arXiv:2601.16051},
  year   = {2026}
}

Comments

contributed talk at LATTICE 2025, Mumbai, 2-8 November 2025