Hands, S. and Montvay, I. and Scorzato, L. and Skullerud, J. (2001) Diquark condensation in dense adjoint matter. The European Physical Journal C, 22 (3). pp. 451-461. ISSN 1434-6044

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Abstract

We study SU(2) lattice gauge theory at non-zero chemical potential with one staggered quark flavor in the adjoint representation. In this model the fermion determinant, although real, can be both positive and negative. We have performed numerical simulations using both hybrid Monte Carlo and two-step multibosonic algorithms, the latter being capable of exploring sectors with either determinant sign. We find that the positive determinant sector behaves like a two-flavor theory, with the chiral condensate rotating into a two-flavor diquark condensate for μ>mπ/2, implying a superfluid ground state. Good agreement is found with analytical predictions made using chiral perturbation theory. In the ‘full’ model there is no sign of either onset of baryon density or diquark condensation for the range of chemical potentials we have considered. The impact of the sign problem has prevented us from exploring the true onset transition and the mode of diquark condensation, if any, for this model.

Item Type:	Article
Keywords:	Diquark; condensation; dense; adjoint matter;
Academic Unit:	Faculty of Science and Engineering > Research Institutes > Hamilton Institute Faculty of Science and Engineering > Theoretical Physics
Item ID:	15680
Identification Number:	https://doi.org/10.1007/s100520100836
Depositing User:	Dr. Jonivar Skullerud
Date Deposited:	15 Mar 2022 17:13
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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