Events - Daily
November 21, 2013 >>
|Thursday, November 21|
Particle AstrophysicsSeminar: Flavio Gatti, University of Genova, "New Developments on Direct Neutrino Mass Searches"
Although the neutrino mass-flavor PMNS mixing matrix and the splittings among masses have been adequately assessed, the absolute mass scale is yet unknown. Further, the discovery of Higgs boson opens new pathways for theoretical investigations on the origin of the neutrino masses. Therefore, beside the intrinsic merit, direct mass searches are becoming more and more intriguing also for the impact on these models. Laboratory measurements with beta or electron capture decaying isotopes permit model-independent access to the mass, but are technologically very challenging. However, after several years of efforts, the present technology achievements allow the design of large scale apparatus with high spectral resolution needed for probing the sub- eV mass range. Here we will discuss about the project HOLMES on Ho-163 EC decay, that has been recently approved by the European Research Council and will be performed in the facilities of the Italian Institute of Nuclear Physics (INFN). The seminar will cover the present status of the calorimetric methods for neutrino mass measurement, the interplay between the R&D for Re-187 and Ho-163 calorimetric spectroscopy, and the perspective of HOLMES in a possible large collaborative effort.
Jadwin A06 · 2:00 p.m.– 3:00 p.m.
Hamilton Colloquium Series - Joseph Polchinski, KITP, University of California-Santa Barbara: "The Black Hole Information Paradox: Alive and Kicking"
Thought experiments have played an important role in figuring out the laws of physics. For the unification of quantum mechanics and gravity, where the phenomena take place in extreme regimes, they are even more crucial. Hawking's 1976 paper "Breakdown of Predictability in Gravitational Collapse" presented one of the great thought experiments in the history of physics, arguing that black holes destroy information in a way that requires a modification of the laws of quantum mechanics. Skeptics for years failed to poke holes in Hawking's argument, but concluded that if quantum mechanics is to be saved, then our understanding of space time must break down in a radical way. For a time it seemed that Maldacena's discovery of gauge/gravity duality had resolved the issue, but the recent firewall argument has opened many new questions.
Jadwin A10 · 4:30 p.m.– 5:30 p.m.