Title: Flavor Evolution of Astrophysical Neutrinos and Many-Body Effects
Date/Time: Nov. 30, 2016 Wednesday @ 13:40
Place: Sabanci University, FENS G032
Speaker: Prof. Yamac Pehlivan
I will begin by brief reviewing the dedection of Solar and Atmospheric neutrinos and the development of our understanding of neutrino oscillations, in this context. Centered around the story of 2015 Nobel Prize in Physics, this part of the talk will partially delve into the details of the solar neutrino problem in order to demonstrate how the effective masses that neutrinos gain in matter modify their flavor oscillations,In the second part of my talk, I will shift my attention to the neutrinos produced in a core collapse supernova and explain how a similar effective mass
mechanism turns the flavor evolution of these neutrinos into a many body problem, forming the only many-body system that we know of which is based entirely on weak interactions. One emergent behavior which shows itself in the supernova neutrino simulations is the so called spectral split phenomenon. Our recent studies has shown that, under some simplifying assumptions, neutrino
spectral split behavior in supernova is completely analougus to the BCS-BEC crossover phenomenon which is already observed in cold atom systems. The last part of my talk will be dedicated to this analogy and its potential importance for interpreting the neutrino signal from a future galactic supernova.