Dresden 2013 – wissenschaftliches Programm
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T: Fachverband Teilchenphysik
T 21: Astroteilchenphysik und Kosmologie (Theorie)
T 21.5: Vortrag
Mittwoch, 6. März 2013, 17:45–18:00, WIL-B122
Ultra-high energy cosmic ray escape from gamma-ray bursts, and the cosmic ray-neutrino connection — •Philipp Baerwald1, Mauricio Bustamante1, Svenja Hümmer1, Amyad Spector2, Eli Waxman2, and Walter Winter1 — 1Institut für Theoretische Physik und Astrophysik, Universität Würzburg, 97074 Würzburg, Germany — 2Physics Faculty, Weizman Institute of Science, POB 26, Rehovot, Israel
Recent IceCube searches for GRB neutrinos have strongly constrained current models predicting GRBs as the source of UHECR. We show that updated calculations based on the connection of gamma-rays and neutrinos give significantly lower neutrino bounds [Phys. Rev. Lett. 108 (2012) 231101]. However additional constraints from the theoretical connection of cosmic rays to neutrinos, based on the assumption that UHECR escape as neutrons, still persist. We therefore explore the possibility of having an additional direct cosmic ray escape component which circumvents these constraints. We show that it is possible to distinguish three distinct regimes with this approach, with the standard (one neutrino per cosmic ray) escape via neutrons only accounting for a small range in the parameter space. Moreover we show how this additional component could improve cosmic ray predictions.