Gravitational Lensing of Neutrino from Collapsars

F.L. VIEYRO; G.E. ROMERO

Foz do Iguazu

Congreso; First Argentine-Brazilian Meeting on Gravitation, Astrophysics and Cosmology; 2011

UNRJ - IAR

We study neutrino emission from long gamma-ray bursts. The collapse of very massivestars to black holes, and the consequent jet formation, are expected to produce high-energy neutrinosthrough photomeson production. Such neutrinos can escape from the source and travel up to theEarth.We focus on the case of Population III progenitors for gamma-ray bursts. Neutrinos can be theonly source of information of the first stars formed in the universe. The expected signal is ratherweak, but we propose that gravitational lensing by nearby supermassive black holes might enhancethe neutrino emission in some cases. We implement a Monte Carlo analysis to ponder the statisticalsignificance of this scenario.We suggest that an observational strategy based on gravitational lensingcould lead to the detection of neutrinos from the re-ionization era of the universe with currentinstrumentation.