Are There Top Quarks In Superdense Hybrid Stars?
  It is examined whether primordial top quarks from the Big Bang could survive under natural conditions till present days. Hybrid quark-neutron stars, with dense enough core to maintain the existence of top quarks, is discussed. In this paper only final states are investigated. Zero temperature quark-lepton matter is modelled as as a gas of non-interacting particles. Local charge neutrality has been assumed in order to avoid volume interactions which would not make thermodynamical treatment possible. 
M. Prisznyak, B. Lukacs and P. Levai (CRIP, RMKI, Bp. Hungary)