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PNS convection and the nuclear symmetry energy.

posted Feb 3, 2012, 9:20 AM by Sanjay Reddy   [ updated Feb 3, 2012, 9:24 AM ]
 In an article titled "Proto-Neutron Star Cooling with Convection: The Effect of the Symmetry Energy", L.F. Roberts, G. Shen, V. Cirigliano, J.A. Pons, S. Reddy, and S.E. Woosley, study protoneutron star (PNS) evolution. We find that PNS convection is largely driven by compositional (lepton number) instabilities.  The extent and duration over which convection operates in the PNS directly impacts the early deleptonization and cooling timescales. In this work we identify that the buoyancy of dense matter varies greatly with the density dependence of the nuclear symmetry energy. We then performed PNS simulations using equations of state with different density depend symmetry energies to show that they result in discernible differences in the neutrino signal.     
The article has been accepted for publication in Phys. Rev. Letts. and can be accessed online.