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Effect of Strong Magnetic Field on Competing Order Parameters in Two-Flavor Dense Quark Matter
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.ORCID iD: 0000-0001-7268-549X
Calif State Univ Long Beach, Dept Phys & Astron, Long Beach, CA 90840 USA..
2017 (English)In: Advances in High Energy Physics, ISSN 1687-7357, E-ISSN 1687-7365, article id 6472909Article in journal (Refereed) Published
Abstract [en]

We study the effect of strong magnetic field on competing chiral and diquark order parameters in a regime of moderately dense quarkmatter. Theinterdependence of the chiral and diquark condensates through nonperturbative quark mass and strong coupling effects is analyzed in a two-flavorNambu-Jona-Lasinio (NJL) model. In the weak magnetic field limit, our results agree qualitatively with earlier zero-field studies in the literature that find a critical coupling ratio G(D/)G(S) similar to 1.1 below which chiral or superconducting order parameters appear almost exclusively. Above the ratio, there exists a significant mixed broken phase region where both gaps are nonzero. However, a strongmagnetic field greater than or similar to 10(18)G disrupts this mixed broken phase region and changes a smooth crossover found in the weak-field case to a first-order transition for both gaps at almost the same critical density. Our results suggest that in the two-flavor approximation to moderately dense quark matter strong magnetic field enhances the possibility of a mixed phase at high density, with implications for the structure, energetics, and vibrational spectrum of neutron stars.

Place, publisher, year, edition, pages
Hindawi Publishing Corporation, 2017. article id 6472909
National Category
Physical Sciences
Identifiers
URN: urn:nbn:se:uu:diva-319306DOI: 10.1155/2017/6472909ISI: 000395155700001OAI: oai:DiVA.org:uu-319306DiVA, id: diva2:1087922
Available from: 2017-04-10 Created: 2017-04-10 Last updated: 2017-11-29Bibliographically approved

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