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Constraints on the high-density nuclear equation of state from the phenomenology of compact stars and heavy-ion collisions

T. Klahn·D. Blaschke·S. Typel·E. N. E. van Dalen·A. Faessler·C. Fuchs·T. Gaitanos·H. Grigorian·A. Ho·E. E. Kolomeitsev·M. C. Miller·G. Ropke·J. Trumper·D. N. Voskresensky·F. Weber·H. H. Wolter
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Abstract

A new scheme for testing nuclear matter equations of state (EsoS) at high densities using constraints from neutron star phenomenology and a flow data analysis of heavy-ion collisions is suggested. An acceptable EoS shall not allow the direct Urca process to occur in neutron stars with masses below $1.5~M_{\odot}$, and also shall not contradict flow and kaon production data of heavy-ion collisions. Compact star constraints include the mass measurements of 2.1 +/- 0.2 M_sun (1 sigma level) for PSR J0751+1807, of 2.0 +/- 0.1 M_sun from the innermost stable circular orbit for 4U 1636-536, the baryon mass - gravitational mass relationships from Pulsar B in J0737-3039 and the mass-radius relationships from quasiperiodic brightness oscillations in 4U 0614+09 and from the thermal emission of RX J1856-3754. This scheme is applied to a set of relativistic EsoS constrained otherwise from nuclear matter saturation properties with the result that no EoS can satisfy all constraints simultaneously, but those with density-dependent masses and coupling constants appear most promising.

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T. Klahn, D. Blaschke, S. Typel, E. N. E. van Dalen, A. Faessler, C. Fuchs, T. Gaitanos, H. Grigorian, A. Ho, E. E. Kolomeitsev, M. C. Miller, G. Ropke, J. Trumper, D. N. Voskresensky, F. Weber, H. H. Wolter. 2006-02-13. Constraints on the high-density nuclear equation of state from the phenomenology of compact stars and heavy-ion collisions. https://doi.org/10.1103/physrevc.74.035802

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