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Light/dark Transition Test for Mice
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Neutron Stars Exclude Light Dark Baryons.

David McKeen1,2, Ann E Nelson3, Sanjay Reddy4

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|August 25, 2018
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Exotic particles may explain cosmic mysteries, but neutron star observations severely limit their properties. These particles must be very heavy or interact strongly to be consistent with massive neutron stars.

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Area of Science:

  • Particle Physics
  • Astrophysics
  • Cosmology

Background:

  • Exotic particles with baryon number are proposed for baryogenesis, dark matter, and the neutron lifetime puzzle.
  • These hypothetical particles are expected to have masses similar to nucleons.

Purpose of the Study:

  • To investigate the constraints imposed by neutron star observations on the properties of exotic baryon-carrying particles.
  • To determine the mass and self-interaction requirements for these particles.

Main Methods:

  • Analysis of astrophysical data from neutron stars.
  • Theoretical modeling of particle interactions within neutron star environments.

Main Results:

  • Neutron stars with masses exceeding 0.7 solar masses place stringent limits on exotic particles.
  • These particles must be heavier than 1.2 GeV or possess strongly repulsive self-interactions.

Conclusions:

  • The existence of massive neutron stars rules out certain parameter spaces for exotic baryon-carrying particles.
  • Observational astrophysics provides crucial constraints for theoretical particle physics models.