Grav and Inertial Mass

[Thomas Larsson]

Steve Carlip wrote:
>For photons from supernova SN1987A, the delay due to the galaxy's
>gravitational field can be calculated -- it's about 5 months. But
>we observed that the photons and neutrinos from SN1987A arrived at
>Earth at very nearly the same time. This allows us to say that the
>time delay is equal, to within about .2%.

If the neutrinos are massive, wouldn't we expect them to arrive later
than the photons? Can one deduce any bounds on neutrino mass from this
supernova?

[Oz]

Thomas Larsson <thomas_larsson_01@hotmail.com> writes
>Steve Carlip wrote:
>>For photons from supernova SN1987A, the delay due to the galaxy's
>>gravitational field can be calculated -- it's about 5 months. But
>>we observed that the photons and neutrinos from SN1987A arrived at
>>Earth at very nearly the same time. This allows us to say that the
>>time delay is equal, to within about .2%.
>
>If the neutrinos are massive, wouldn't we expect them to arrive later
>than the photons? Can one deduce any bounds on neutrino mass from this
>supernova?

Also I was under the impression that neutrinos pass through the
exploding star unhindered, whilst photons must essentially diffuse out
from the core. Surely one would have expected the neutrinos to arrive
significantly before the photons anyway, perhaps days?

However your gravitational delay of five months is enormous.
One might have expected a differential time measured in days or months.
Has any attempt at correlation between the various neutrino detectors
over a much extended time period been carried out?


--
Oz
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