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Possible Instability of the Ground State of Two-Flavour Colour Superconductor Induced by Colour Neutrality |
| HE Lian-Yi;JIN Meng;ZHUANG Peng-Fei |
| Department of Physics, Tsinghua University, Beijing 100084 |
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| Cite this article: |
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HE Lian-Yi, JIN Meng, ZHUANG Peng-Fei 2006 Chin. Phys. Lett. 23 564-567 |
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Abstract The diquark condensate susceptibility in neutral colour superconductor at moderate baryon density is calculated in the frame of the two-flavour Nambu--Jona--Lasinio model with the mean field approximation. When colour chemical potential is introduced to keep charge neutrality, the diquark condensate susceptibility
is negative in the directions without diquark condensate in colour space, which may be regarded as a signal of the instability of the conventional ground state with only diquark condensate in the colour-3 direction.
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| Keywords:
11.30.Qc
12.38.Lg
11.10.Wx
25.75.Nq
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Published: 01 March 2006
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| PACS: |
11.30.Qc
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(Spontaneous and radiative symmetry breaking)
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12.38.Lg
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(Other nonperturbative calculations)
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11.10.Wx
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(Finite-temperature field theory)
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25.75.Nq
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(Quark deconfinement, quark-gluon plasma production, and phase transitions)
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