= Stellar equation-of-state regime diagram
A <temperature> versus density diagram separates classical, degenerate, nonrelativistic and relativistic stellar-matter limits. The <Electron> degeneracy boundary is $T\sim T_F(\rho)$, with slope $2/3$ at low density and $1/3$ at high density. Thermal relativity is controlled by $k_BT\sim m_ec^2$, while relativity of degenerate <Electrons> is controlled by $p_F\sim m_ec$. <Photon> <pressure> and thermal electron-positron pairs add further crossovers; all depend on composition and are gradual, not thermodynamic phase boundaries.
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