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We calculate the neutrino signal from Population III supermassive starcollapse using a neutrino transfer code originally developed for core collapsesupernovae and massive star collapse. Using this code, we are able toinvestigate the supermassive star mass range thought to undergo neutrinotrapping ($\sim 10^4$ M$_\odot$), a mass range which has been neglected byprevious works because of the difficulty of neutrino transfer. For models inthis mass range, we observe a neutrino-sphere with a large radius and lowdensity compared to typical massive star neutrino-spheres. We calculate theneutrino light-curve emitted from this neutrino-sphere. The resulting neutrinoluminosity is significantly lower than the results of a previous analyticalmodel. We briefly discuss the possibility of detecting a neutrino burst from asupermassive star or the neutrino background from many supermassive stars andconclude that the former is unlikely with current technology, unless the SMScollapse is located as close as 1 Mpc, while the latter is also unlikely evenunder very generous assumptions. However, the supermassive star neutrinobackground is still of interest as it may serve as a source of noise inproposed dark matter direct detection experiments.

Neutrino emission from the collapse of $\sim 10^4$ $M_\odot$ population III supermassive stars