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A Clash of Clusters Provides New Clue to Dark Matter
Special ACKS Seminar: Dragan Huterer
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ACKS Seminar: Peter Sturrock (Stanford University)
| What | ACKS |
|---|---|
| When |
28 February 08 from 04:00 pm to 05:30 pm |
| Where | Hewlett 201 (a.k.a. the "Physics Colloquium Auditorium") |
| Contact Name | Lukasz Stawarz |
| Contact Email | stawarz@slac.stanford.edu |
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A New Perspective on Solar Neutrinos
The standard opinion concerning solar neutrinos is that the flux is constant, but less than expected due to the conversion of electron neutrinos to mu and/or tau neutrinos by the MSW process. There has however been a minority opinion that the flux is not constant, but varies with solar rotation due to an interplay of a neutrino transition magnetic moment and the Sun’s internal magnetic field (in the convection zone) by the RSFP process. Recent new analyses of the data, to be presented, now point to another possibility: that the flux is variable, but the variability arises in the core rather than in the convection zone. The new procedure is time-frequency analysis, which gives much more information than a simple power-spectrum analysis. This procedure enables us to distinguish between a real periodic modulation and aliases of that modulation. This procedure points to modulation frequencies that are too low to be associated with the convection zone, but are appropriate for the deep radiative zone, including the core.
Fermi Lunch - Richard Dubois