Particle-physics constraints from the globular cluster M5: neutrino dipole moments ?

  title={Particle-physics constraints from the globular cluster M5: neutrino dipole moments ?},
  author={Nicol'as Viaux and M{\'a}rcio Catel{\'a}n and Peter B. Stetson and Georg Raffelt and Javier Redondo and Aldo A. R. Valcarce and Achim Weiss},
  journal={Astronomy and Astrophysics},
Stellar evolution is modified if energy is lost in a “dark channel” similar to neutrino emission. Comparing modified stellar evolution sequences with observations provides some of the most restrictive limits on axions and other hypothetical low-mass particles and on non-standard neutrino properties. In particular, a putative neutrino magnetic dipole moment enhances the plasmon decay process, postpones helium ignition in low-mass stars, and therefore extends the red giant branch (RGB) in… 

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