Journal
NUCLEAR PHYSICS A
Volume 872, Issue 1, Pages 13-24Publisher
ELSEVIER
DOI: 10.1016/j.nuclphysa.2011.09.008
Keywords
Nuclear matter; Chiral phase transition; Nonzero density; Tetraquark
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Funding
- Deutsche Forschungsgemeinschaft (DFG) [PA 1780/2-1]
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We investigate the role of a scalar tetraquark state for the description of nuclear matter within the parity doublet model in the mirror assignment. In the dilatation-invariant version of the model a nucleon nucleon interaction term mediated by the lightest scalar tetraquark field naturally emerges. At nonzero density one has, beyond the usual chiral condensate, also a tetraquark condensate. The behavior of both condensates and the restoration of chiral symmetry at high density are studied. It is shown that this additional scalar degree of freedom affects non-negligibly the properties of the medium. (C) 2011 Published by Elsevier B.V.
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