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Nuclear phenomena derived from quark-gluon strings

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Authors:
  • Bohr, Henrik ;
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    Biophysics and Fluids, Department of Physics, Technical University of Denmark
  • Providencia, Constanca ;
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    University of Coimbra
  • Providencia, Joao da
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    University of Coimbra
DOI:
10.1103/physrevc.71.055203
Abstract:
We propose a quantum chromodynamics (QCD) based many-body model for the nucleus where the strong coupling regime is controlled by a three-body string force, and the weak coupling regime is dominated by a pairing force. This model operates effectively with a quark-gluon Lagrangian containing a pairing force from instantons, and a baryonic string term which contains a confining potential. The unified model for weak and strong coupling regimes is, however, only consistent at the border of perturbative QCD. The baryonic string force is necessary, as a stability and compressibility analysis shows, for the occurrence of the phases of nuclear matter. The model exhibits a quark deconfinement transition and chiral restoration, which are ingredients of QCD and give qualitatively correct numerics. The effective model is shown to be isomorphic to the Nambu-Jona-Lasinio model and exhibits the correct chirality provided that the chiral fields are identified with the two-particle strings, which are natural in a QCD framework. Moreover, the model is able to reconcile qualitatively such aspects of hadronic physics as saturation density and binding energy of nuclear matter, surface density of finite nuclei, mass of the scalar particle, medium range NN interaction, and f(pi) value in vacuum.
Type:
Journal article
Language:
English
Published in:
Physical Review C, 2005, Vol 71, Issue 5
Keywords:
Main Research Area:
Science/technology
Publication Status:
Published
Review type:
Peer Review
Submission year:
2005
Scientific Level:
Scientific
ID:
108154609

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