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SUMMARY:High-energy rise in the cosmic-ray positron fraction: possible cau
 ses
DTSTART;VALUE=DATE-TIME:20081211T130000Z
DTEND;VALUE=DATE-TIME:20081211T140000Z
DTSTAMP;VALUE=DATE-TIME:20130519T174852Z
UID:indico-event-43036@cern.ch
DESCRIPTION:Recent PAMELA data seem to confirm previous evidence of an inc
 rease of the positron fraction in cosmic rays above an energy of E~7 GeV. 
 In the first part of the talk\, I will argue (based on general considerati
 ons rather than model-dependent fits to specific scenarios) that most like
 ly this requires a primary galactic source of electron-positron pairs. In 
 the second part of the talk\, I will give a schematic overview of the poss
 ible models (both astrophysical ones and involving dark matter) proposed t
 o explain the signature\, emphasizing the importance of complementary cons
 traints from other cosmic ray data\, as well as specific signatures which 
 may help in identifying the origin of the feature.\n\nhttp://indico.cern.c
 h/conferenceDisplay.py?confId=43036
LOCATION:CERN TH Theory Conference Room
URL:http://indico.cern.ch/conferenceDisplay.py?confId=43036
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