Hands, S. and Montvay, I. and Morrison, S. and Oevers, M. and Scorzato, L. and Skullerud, Jon-Ivar (2000) Numerical study of dense adjoint matter in two color QCD. The European Physical Journal C, 17 (2). pp. 285-302. ISSN 1434-6044

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Abstract

We identify the global symmetries of SU(2) lattice gauge theory with N flavors of staggered fermion in the presence of a quark chemical potential µ, for fermions in both fundamental and adjoint representations, and anticipate likely patterns of symmetry breaking at both low and high densities. Results from numerical simulations of the model with N = 1 adjoint flavor on a 43 × 8 lattice are presented, using both hybrid Monte Carlo and Two-Step Multi-Boson algorithms. It is shown that the sign of the fermion determinant starts to fluctuate once the model enters a phase with non-zero baryon charge density. HMC simulations are not ergodic in this regime, but TSMB simulations retain ergodicity even in the dense phase, and in addition appear to show superior decorrelation. The HMC results for the equation of state and the pion mass show good quantitative agreement with the predictions of chiral perturbation theory, which should hold only for N ≥ 2. The TSMB results incorporating the sign of the determinant support a delayed onset transition, consistent with the pattern of symmetry breaking expected for N = 1.

Item Type:	Article
Keywords:	Numerical study; dense; adjoint matter; two color; QCD;
Academic Unit:	Faculty of Science and Engineering > Research Institutes > Hamilton Institute Faculty of Science and Engineering > Theoretical Physics
Item ID:	15698
Identification Number:	https://doi.org/10.1007/s100520000477
Depositing User:	Dr. Jonivar Skullerud
Date Deposited:	21 Mar 2022 15:56
Journal or Publication Title:	The European Physical Journal C
Publisher:	Springer
Refereed:	Yes
URI:	Publisher
Use Licence:	This item is available under a Creative Commons Attribution Non Commercial Share Alike Licence (CC BY-NC-SA). Details of this licence are available here

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