Finite Size Effect on the in-Medium Chiral Condensate at Finite Density

doi:10.1088/0256-307X/31/4/041101

Chin. Phys. Lett.

2014, Vol. 31

Issue (04): 041101 DOI: 10.1088/0256-307X/31/4/041101

THE PHYSICS OF ELEMENTARY PARTICLES AND FIELDS

Finite Size Effect on the in-Medium Chiral Condensate at Finite Density

XIA Cheng-Jun¹, PENG Guang-Xiong^1,2**, HOU Jia-Xun²

¹School of Physics, University of Chinese Academy of Sciences, Beijing 100049
²Theoretical Physics Center for Science Facilities, Institute of High Energy Physics, Beijing 100049

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XIA Cheng-Jun, PENG Guang-Xiong, HOU Jia-Xun 2014 Chin. Phys. Lett. 31 041101

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Abstract The in-medium quark condensate is studied with an equivalent quark mass approach that has the advantage of no need for extra assumptions on the current mass derivatives of model parameters with respect to the quark current mass. It is found that the ratio of the quark condensate in a medium to that in a vacuum depends not only on density but also on the finite size. With decreasing volume, it decreases to a minimum, and then saturates at a radius of about 1 fm. The condensate approaches to its bulk value when the volume becomes infinitely large, and it decreases linearly with increasing density if the density is extremely low.

Received: 04 July 2013 Published: 25 March 2014

PACS:	11.30.Rd	(Chiral symmetries)
	12.39.-x	(Phenomenological quark models)
	21.65.Qr	(Quark matter)
	24.85.+p	(Quarks, gluons, and QCD in nuclear reactions)

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	PENG Guang-Xiong
	HOU Jia-Xun

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