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Strangeness in stellar matter

  • Strangeness in Stars
  • Published:
Acta Physica Hungarica New Series Heavy Ion Physics

Abstract

A protoneutron star is formed immediately after the gravitational collapse of the core of a massive star. At birth, the hot and high density matter in such a star contains a large number of neutrinos trapped during collapse. Trapped neutrinos generally inhibit the presence of exotic matter — hyperons, a kaon condensate, or quarks. However, as the neutrinos diffuse out in about 10–15 s, the threshold for the appearance of strangeness is reduced; hence, the composition and the structure of the star can change significantly. The effect of exotic, negatively-charged, strangeness-bearing components is always to soften the equation of state, and the possibility exists that the star collapses to a black hole at this time. This could explain why no neutron star has yet been seen in the remnant of supernova SN1987A, even though one certainly existed when neutrinos were detected on Feb. 23, 1987. With new generation neutrino detectors it is feasible to test different theoretical scenarios observationally.

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Authors and Affiliations

  1. Physics Department, State University of New York at Stony Brook, 11794, Stony Brook, New York, USA

    M. Prakash & S. Reddy

  2. Earth and Space Sciences Department, State University of New York at Stony Brook, 11794, Stony Brook, New York, USA

    J. M. Lattimer

  3. School of Physics and Astronomy, University of Minnesota, 55455, Minneapolis, MN, USA

    P. J. Ellis

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  1. M. Prakash
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  2. S. Reddy
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  3. J. M. Lattimer
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  4. P. J. Ellis
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Prakash, M., Reddy, S., Lattimer, J.M. et al. Strangeness in stellar matter. APH N.S., Heavy Ion Physics 4, 271–292 (1996). https://doi.org/10.1007/BF03155623

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  • DOI: https://doi.org/10.1007/BF03155623

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