Physics – Nuclear Physics
Scientific paper
Jul 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994nupha.574..217b&link_type=abstract
Nuclear Physics A, Volume 574, Issue 1-2, p. 217-230.
Physics
Nuclear Physics
20
Scientific paper
It is proposed that the dense matter formed in the collapse of large stars goes strange while still in the nucleon-meson (broken chiral symmetry) phase through kaon condensation. The K--meson energy is lowered, with increasing density, by the attractive vector mean field originating from the dense nucleonic matter. Once the K- energy comes down to the electron chemical potential μe, which increases with increasing density, the elec- trons change into K--mesons through the reaction e- --> K- + v. This is estimated to occur at a density ϱc ~ 3ϱ0, where ϱ0 is nuclear matter density.
Above the density ϱc, the K- mesons condense into a zero momentum state. Roughly as many protons as neutrons are present because the charge carried by the former can be neutralized by the kaons. As a result, the compact remnant of the collapse is a nuclear matter, or ``nucleon'', star, rather than a neutron star.
With inclusion of kaon condensation, the equation of state of dense matter is softened, resulting in a maximum stable compact object mass of Mmax ~- 1.5 Msolar. It is shown, however, that cores of masses in the range of ~ 1.5-1.8 Msolar can be stable for long enough to produce nucleosynthesis and to return matter to the galaxy before they later collapse into black holes.
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