Deeply bound dibaryon is incompatible with neutron stars and supernovae

McDermott, Samuel D. (Fermi National Accelerator Laboratory, Theoretical Astrophysics Group, Batavia, 60510 Illinois, USA) ; Reddy, Sanjay (Institute for Nuclear Theory, University of Washington, 98105 Seattle, Washington, USA) ; Sen, Srimoyee (Institute for Nuclear Theory, University of Washington, 98105 Seattle, Washington, USA)

12 February 2019

Abstract: We study the effect of a dibaryon S in the mass range 1860<mS<2054 MeV, which is heavy enough not to disturb the stability of nuclei and light enough to possibly be cosmologically metastable. Such a deeply bound state can act as a baryon sink in regions of high baryon density and temperature. We find that the ambient conditions encountered inside a newly born neutron star are likely to sustain a sufficient population of hyperons to ensure that a population of S dibaryons can equilibrate in less than a few seconds. This would be catastrophic for the stability of neutron stars and the observation of neutrino emission from the proto-neutron star of Supernova 1987A over O(10) s. A deeply bound dibaryon is therefore incompatible with the observed supernova explosion, unless the cross section for S production is severely suppressed.


Published in: Physical Review D 99 (2019)
Published by: APS
DOI: 10.1103/PhysRevD.99.035013
arXiv: 1809.06765
License: CC-BY-4.0



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