[Turkmath:7051] FGE-Seminar: Yamaç Pehlivan (Mimar Sinan Fine Arts University), Neutrino Self Refraction and Nonlinear Flavor Oscillations, May 20 (Thursday), 2010 - 14:00

[Kursat Aker]

      TÜBI.TAK - FEZA GÜRSEY INSTITUTE


  Seminars

May 20 (Thursday), 2010 - 14:00
*Yamaç Pehlivan* (Mimar Sinan Fine Arts University)
*Neutrino Self Refraction and Nonlinear Flavor Oscillations*

*Abstract :* In a dense neutrino gas, neutrino-neutrino scattering 
creates a refractive effect on the flavor oscillations of neutrinos in a 
way which is similar to the refraction of light waves in ordinary 
matter. However, the neutrino self refraction is different from ordinary 
refraction as in the former the refracting and the refracted particles 
are indistinguishable. This turns a dense neutrino gas into a highly 
nonlinear many-body system. Clearly one needs very high neutrino 
densities for the tiny neutrino-neutrino scattering cross section to 
play an important part but such high neutrino densities are believed to 
be reached in the Early Universe, in core collapse supernovae and 
possibly in gamma ray bursts.

In this talk, I will summarize the neutrino self refraction problem with 
an emphasis on its many body character. I will then point to the 
similarities between a self interacting dense neutrino gas and another 
many body system that we are familiar with, namely a system with pairing 
interactions which is used to describe Cooper pairs in the BCS theory of 
superconductivity and nucleon pairs in nuclear shell model. An 
interesting property that a self interacting dense neutrino gas has in 
common with the later models is that it possesses dynamical symmetries. 
I will talk about the possible implications of these dynamical 
symmetries on the resulting neutrino flavor oscillations.

Poster <http://www.gursey.gov.tr/autoposter/posters/48.pdf>


For requests, apply to *seminar[et]gursey_gov_tr*.
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