Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005omeg.conf..489i&link_type=abstract
ORIGIN OF MATTER AND EVOLUTION OF GALAXIES 2003. Held 17-19 November 2003 in RIKEN, Wako, Saitama, Japan. Edited by M Terasawa,
Astronomy and Astrophysics
Astronomy
Scientific paper
In the framework of RMF containing the full baryon octet [1] , we have made the EOS table at high densities combined with the relativistic nuclear EOS table [2] at lower densities. Both parts of the table is based on the TM1 parameter [3] of RMF, then the table covers wide range of nuclear densities, from 105.1g/cc to 1015.4g/cc, smoothly. As a sample calculation by using this new EOS table, we perform 1-dim. spherical hydrodynamical calculation [4] with the relativistic EOS of supernova matter including hyperons and discuss the EOS dependence of the explosion energy. For the most attractive Σ potential case, we find that hyperons increase the explosion energy by about 4 % in the case of 15Mo model. We also show the element composition around core bounce, where ρ ~ 1.6p. At this density, hyperons can appear due to finite temperature effects. Although the hyperon ratio is small, it leads to the reduction of pressure by around 3 %. In this paper, we discuss the mechanism of hyperon admixture, and progenitor mass dependence on hyperon ratio.
Ishizuka Chikako
Ohnishi Akira
Sumiyoshi Kohsuke
Yamada Shoichi
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