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

T. Klähn, 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. Röpke, J. Trümper, D. N. Voskresensky, F. Weber, and H. H. Wolter
Phys. Rev. C 74, 035802 – Published 21 September 2006

Abstract

A new scheme for testing nuclear matter equations of state (EoSs) at high densities using constraints from neutron star (NS) 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 NSs with masses below 1.5M, and also shall not contradict flow and kaon production data of heavy-ion collisions. Compact star constraints include the mass measurements of 2.1±0.2M (1σ level) for PSR J0751+1807 and of 2.0±0.1M 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 EoSs which are constrained otherwise from nuclear matter saturation properties. We demonstrate on the given examples that the test scheme due to the quality of the newly emerging astrophysical data leads to useful selection criteria for the high-density behavior of nuclear EoSs.

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  • Received 20 February 2006

DOI:https://doi.org/10.1103/PhysRevC.74.035802

©2006 American Physical Society

Authors & Affiliations

T. Klähn1,2,*, D. Blaschke3,4,†, S. Typel3, E. N. E. van Dalen2, A. Faessler2, C. Fuchs2, T. Gaitanos5, H. Grigorian1,6, A. Ho7, E. E. Kolomeitsev8, M. C. Miller9, G. Röpke1, J. Trümper10, D. N. Voskresensky3,11, F. Weber7, and H. H. Wolter5

  • 1Institut für Physik, Universität Rostock, D-18051 Rostock, Germany
  • 2Institut für Theoretische Physik, Universität Tübingen, D-72076 Tübingen, Germany
  • 3Gesellschaft für Schwerionenforschung mbH (GSI), D-64291 Darmstadt, Germany
  • 4Bogoliubov Laboratory of Theoretical Physics, Joint Institute for Nuclear Research, Ru-141980 Dubna, Russia
  • 5Department für Physik, Universität München, D-85748 Garching, Germany
  • 6Department of Physics, Yerevan State University, 375049 Yerevan, Armenia
  • 7Department of Physics, San Diego State University, 5500 Campanile Drive, San Diego, California 92182, USA
  • 8School of Physics and Astronomy, University of Minnesota, Minneapolis, Minnesota 55455, USA
  • 9Department of Astronomy, University of Maryland, College Park, Maryland 20742-2421, USA
  • 10Max-Planck-Institut für extraterrestrische Physik, D-85741 Garching, Germany
  • 11Moscow Engineering Physical Institute, Kashirskoe Shosse 31, Ru-11549 Moscow, Russia

  • *Electronic address: thomas.klaehn@uni-rostock.de
  • Electronic address: blaschke@theory.gsi.de

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Vol. 74, Iss. 3 — September 2006

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