Sunday, May 03, 2009

Fermi: electron spectrum remains inconclusive

Yesterday, new results from Fermi (previously GLAST) were presented at an APS meeting in Denver. The telescope has already considerably strengthened bounds on Lorentz-violating terms in the theories describing our Universe, getting very close to the point at which all semi-motivated Lorentz-breaking theories are ruled out by observations.

However, its verdict about the dark matter remains inconclusive. The observed excess of high-energy electrons may be caused by dark matter annihilation - which is a possibility that the people around PAMELA promote - or it can still be a product of mundane astrophysical sources such as pulsars.


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