Lattice Study of Dense Matter with Two Colors and Four Flavors

Hands, Simon and Kenny, Philip and Kim, Seyong and Skullerud, Jon-Ivar (2011) Lattice Study of Dense Matter with Two Colors and Four Flavors. European Physical Journal a: Hadrons and Nuclei , 47 (5-60). pp. 1-7. ISSN 1434-6001

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We present results from a simulation of SU(2) lattice gauge theory with Nf = 4 flavors of Wilson fermion and non-zero quark chemical potential μ, using the same 123 × 24 lattice, bare gauge coupling, and pion mass in cut-off units as a previous study [9] with Nf = 2. The string tension for Nf = 4 is found to be considerably smaller implying smoother gauge field configurations. Thermodynamic observables and order parameters for superfluidity and color deconfinement are studied, and comparisons drawn between the two theories. Results for quark density and pressure as functions of μ are qualitatively similar for Nf = 2 and Nf = 4; in both cases there is evidence for a phase in which baryonic matter is simultaneously degenerate and confined. Results for the stress-energy tensor, however, suggest that while Nf = 2 has a regime where dilute matter is non-relativistic and weakly-interacting, Nf = 4 matter is relativistic and strongly-interacting for all values of μ above onset.

Item Type: Article
Additional Information: The final publication is available at This project was enabled with the assistance of IBM Deep Computing. S.K. was supported by the National Research Foundation of Korea grant funded by the Korea government (MEST) No. 2010-0022219.
Keywords: lattice study; dense matter; Wilson fermion; lattice gauge theory;
Academic Unit: Faculty of Science and Engineering > Mathematical Physics
Item ID: 2601
Identification Number: DOI 10.1140/epja/i2011-11060-1
Depositing User: Dr. Jonivar Skullerud
Date Deposited: 07 Jul 2011 11:41
Journal or Publication Title: European Physical Journal a: Hadrons and Nuclei
Publisher: Springer Verlag
Refereed: No
Funders: National Research Foundation of Korea

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