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Center for Astrophysics Research and Technologies Seminar Series Information


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Collisional Flavor Instabilities in Neutrino-Dense Anisotropic Environments

Tuesday October 24, 2023
2:00 pm

 Presenter:  Nishant Raina (UNM)
 Series:  Nuclear, Particle, Astroparticle and Cosmology (NUPAC) Seminars
 Abstract:  Neutrino-dense environments are host to the phenomenon of collective oscillations where neutrino-neutrino refraction impacts neutrino flavor transformation in nontrivial ways. Charged-current neutrino collision processes like those of neutrino emission and absorption on nucleons act as a measurement of a neutrino‚Äôs flavor state causing it to decohere. However, collisional flavor instabilities (CFIs) are sometimes found to enhance flavor conversion when aided by neutrino-neutrino refraction. Results obtained while assuming an isotropic neutrino distribution function attribute asymmetries between the collision rates to be responsible for this. It is also found, among other things, that the maximum growth rates for CFIs are co-existent with having a negligible neutrino electron lepton number. Our work focuses on extending this theory by taking into account an anisotropic distribution function for the neutrinos, namely one dependent on both the energy and direction of neutrinos. We hope to explain some of these concepts in more detail while laying out the strategy we intend to use to solve the anisotropic problem.
 Web Site:    https:/ / unm.zoom.us/ j/ 94141126387
 Host:  David Camarena
 Location:  PAIS-3205, PAIS

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