Ultimate Energy Density of Observable Cold Baryonic Matter

James M. Lattimer, Madappa Prakash
2005 Physical Review Letters  
We demonstrate that the largest measured mass of a neutron star establishes an upper bound to the energy density of observable cold matter. An equation of state-independent expression satisfied by both normal neutron stars and self-bound quark matter stars is derived for the largest energy density inside stars as a function their masses. The largest observed mass sets the lowest upper limit to the density. Implications from existing and future neutron star mass measurements are discussed.
doi:10.1103/physrevlett.94.111101 pmid:15903841 fatcat:o3qhjb6ffrganb676kon6tgxai