Nuclear matter at high density: Phase transitions, multiquark states, and supernova outbursts
Abstract
Phase transition from hadronic matter to quarkgluon matter is discussed for various regimes of temperature and baryon number density. For small and medium densities, the phase transition is accurately described in the framework of the Field Correlation Method, whereas at high density predictions are less certain and leave room for the phenomenological models. We study formation of multiquark states (MQS) at zero temperature and high density. Relevant MQS components of the nuclear matter can be described using a previously developed formalism of the quark compound bags (QCB). Partialwave analysis of nucleonnucleon scattering indicates the existence of 6QS which manifest themselves as poles of P matrix. In the framework of the QCB model, we formulate a selfconsistent system of coupled equations for the nucleon and 6QS propagators in nuclear matter and the G matrix. The approach provides a link between highdensity nuclear matter with the MQS components and the cumulative effect observed in reactions on the nuclei, which requires the admixture of MQS in the wave functions of nuclei kinematically. 6QS determines the natural scale of the density for a possible phase transition into theMQS phase of nuclear matter. Such a phase transition can lead to dynamic instability of newly born protoneutron stars and dramatically affect the dynamics of supernovae. Numerical simulations show that the phase transition may be a good remedy for the triggering supernova explosions in the spherically symmetric supernovamodels. A specific signature of the phase transition is an additional neutrino peak in the neutrino light curve. For a Galactic corecollapse supernova, such a peak could be resolved by the present neutrino detectors. The possibility of extracting the parameters of the phase of transition from observation of the neutrino signal is discussed also.
 Publication:

Physics of Atomic Nuclei
 Pub Date:
 March 2011
 DOI:
 10.1134/S1063778811030112
 arXiv:
 arXiv:1006.0570
 Bibcode:
 2011PAN....74..371K
 Keywords:

 High Energy Physics  Phenomenology;
 Astrophysics  High Energy Astrophysical Phenomena;
 Nuclear Theory
 EPrint:
 57 pages, 22 figures, 7 tables