Cosmological bounds on tachyonic neutrinos

Details Cosmological bounds on tachyonic neutrinos Cosmological bounds on tachyonic neutrinos

2012-01-16

arxiv.org/abs/1201.3284v1

Astronomy and Astrophysics

Astrophysics

Cosmology and Extragalactic Astrophysics

LaTeX, 4 pages

Scientific paper

Recent time-of-flight measurements on muon neutrinos in the OPERA neutrino oscillation experiment have found anomalously short times compared to the light travel-times, corresponding to a superluminal velocity, $v-1=2.37\pm0.32\times 10^{-5}$ in units where $c=1$. We show that cosmological bounds rule out an explanation involving a Lorentz invariant tachyonic neutrino. At the OPERA energy scale, nucleosynthesis constraints imply $v-1<0.86\times 10^{-12}$ and the Cosmic Microwave Background observations imply $v-1<7.1\times 10^{-23}$. The CMB limit on the velocity of a tachyon with an energy of 10 MeV is stronger than the SN1987A limit. Superluminal neutrinos that could be observed at particle accelerator energy scales would have to be associated with Lorentz symmetry violation.

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