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Effects of a multi-quark interaction on color superconducting phase transition in an extended NJL model

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 نشر من قبل Masayuki Matsuzaki
 تاريخ النشر 2007
  مجال البحث
والبحث باللغة English
 تأليف Kouji Kashiwa




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We study the interplay of the chiral and the color superconducting phase transitions in an extended Nambu--Jona-Lasinio model with a multi-quark interaction that produces the nonlinear chiral-diquark coupling. We observe that this nonlinear coupling adds up coherently with the omega^2 interaction to produce the chiral-color superconductivity coexistence phase or cancel each other depending on its sign. We discuss that large coexistence region in the phase diagram is consistent with the quark-diquark picture for the nucleon whereas its smallness is the prerequisite for the applicability of the Ginzburg-Landau approach.



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