QMC as a model of dense matter: from finite nuclei to hybrid stars
Jonathan Carroll
University of Adelaide, Australia
The QCD phase diagram at mu > 0, T \ge 0 is largely unknown and
particularly inaccessible to even lattice QCD simulations. One method for
investigating the mu >> 0 region is effective field theory using mean-field
meson potentials.
The EMC effect indicates that the quark structure of the nucleon is modified in
an essential way in a nuclear medium, and the Quark-Meson Coupling (QMC) model
provides a simple yet very successful description of meson-baryon interactions
with feedback to the quark structure of the baryons.
With QMC predictions for finite nuclei -- and, in particular, finite hypernuclei
-- proving accurate, our attention turns to the equation of state of dense
matter and the structure of 'hybrid stars'; neutron stars with proportions of
hyperonic- or quark-matter. Using such an equation of state as an input to the
Tolman-Oppenheimer-Volkoff equation allows us to construct models of stars and
compare predicted mass and radius with pulsar observations.
I will discuss the origins and predictions of QMC ranging from finite nuclei to
hybrid stars and our recent progress in extending this model beyond the
mean-field approximation to Hartree--Fock.