In a paper appearing today on arXiv, Wie et al. have used the close coincidence of the time of arrival of gamma rays from GRBs and the detection of single 3-30 TeV neutrinos at the IceCube observatory, to say that the velocity difference between neutrinos and photons is no bigger than $$ | v-c | < 2.5\times 10^{-18} c.$$

Leaving aside whether these are genuine coincidences, this means the Lorentz factor of these neutrinos is $\gamma >4.4\times 10^{8}$, and for a neutrino energy of 3 Tev, means that the neutrino rest mass energy is $< 6.8$ keV.

The authors do not calculate this mass and do not comment on the neutrino rest mass. My question is twofold - firstly, have I got this right, and secondly, surely we already know (from cosmological considerations) that the rest mass of neutrinos is (much) less than 6.8 keV so is this result in any way noteworthy, or is it just dotting the i's and crossing the t's?

In a paper appearing today on arXiv, Wie et al. have used the close coincidence of the time of arrival of gamma rays from GRBs and the detection of single 3-30 TeV neutrinos at the IceCube observatory, to say that the velocity difference between neutrinos and photons is no bigger than $$ | v-c | < 2.5\times 10^{-18} c.$$

Leaving aside whether these are genuine coincidences, this means the Lorentz factor of these neutrinos is $\gamma >4.4\times 10^{8}$, and for a neutrino energy of 3 Tev, means that the neutrino rest mass energy is $< 6.8$ keV.

The authors do not calculate this mass and do not comment on the neutrino rest mass. My question is surely we already know (from cosmological considerations) that the rest mass of neutrinos is (much) less than 6.8 keV so is this result in any way noteworthy, or am I missing a bigger picture?

In a paper appearing today on arXiv, Wie et al. have used the close coincidence of the time of arrival of gamma rays from GRBs and the detection of single 3-30 TeV neutrinos at the IceCube observatory, to say that the velocity difference between neutrinos and photons is no bigger than $$ | v-c | < 2.5\times 10^{-18} c.$$

Leaving aside whether these are genuine coincidences, this means the Lorentz factor of these neutrinos is $\gamma >4.4\times 10^{-8}$, and for a neutrino energy of 3 Tev, means that the neutrino rest mass energy is $< 6.8$ keV.

The authors do not calculate this mass and do not comment on the neutrino rest mass. My question is twofold - firstly, have I got this right, and secondly, surely we already know (from cosmological considerations) that the rest mass of neutrinos is (much) less than 6.8 keV so is this result in any way noteworthy, or is it just dotting the i's and crossing the t's?

In a paper appearing today on arXiv, Wie et al. have used the close coincidence of the time of arrival of gamma rays from GRBs and the detection of single 3-30 TeV neutrinos at the IceCube observatory, to say that the velocity difference between neutrinos and photons is no bigger than $$ | v-c | < 2.5\times 10^{-18} c.$$

Leaving aside whether these are genuine coincidences, this means the Lorentz factor of these neutrinos is $\gamma >4.4\times 10^{8}$, and for a neutrino energy of 3 Tev, means that the neutrino rest mass energy is $< 6.8$ keV.

The authors do not calculate this mass and do not comment on the neutrino rest mass. My question is twofold - firstly, have I got this right, and secondly, surely we already know (from cosmological considerations) that the rest mass of neutrinos is (much) less than 6.8 keV so is this result in any way noteworthy, or is it just dotting the i's and crossing the t's?