Comment on ``Strangelets as Cosmic Rays beyond the Greisen-Zatsepin-Cuzmin Cutoff''

Details Comment on ``Strangelets as Cosmic Rays beyond the Greisen-Zatsepin-Cuzmin Cutoff'' Comment on ``Strangelets as Cosmic Rays beyond the Greisen-Zatsepin-Cuzmin Cutoff''

2004-03-21

arxiv.org/abs/astro-ph/0403503v1

Phys.Rev.Lett. 92 (2004) 119001

Astronomy and Astrophysics

Astrophysics

2 pages, slightly extended version of journal paper

Scientific paper

10.1103/PhysRevLett.92.119001

Madsen and Larsen proposed (astro-ph/0211597) that strangelets - stable lumps of strange quark matter (SQM) - are candidates for the highest energy cosmic rays. They point out that the expected properties of strangelets make them easier to accelerate and less prone to energy losses than protons or ions. The purpose of this Comment is to point out that if ultra-high-energy cosmic rays (UHECRs) are indeed strangelets, their flux would guarantee that all neutron stars must be strange quark (SQ) stars, while no ``conventional'' (i.e., composed of nucleons and other baryons) neutron stars can coexist. This seems highly unlikely in view of various observed phenomena in neutron stars.

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