Accueil > Séminaires d’Astrophysique > Cosmic positron and electron excesses : is the dark matter solution a good bet ?

 

Cosmic positron and electron excesses : is the dark matter solution a good bet ?

Julien Lavalle (Instituto Nazionale di Fisica Nucleare, Italie) — au CESR

Par Francois RINCON - 13/11/2009

 

Séminaires d’Astrophysique

de l’Observatoire Midi-Pyrénées


Séminaire de

Julien Lavalle

(Instituto Nazionale di Fisica Nucleare, Italie )

Jeudi 19 Novembre 2009 à 11h

CESR


Cosmic positron and electron excesses : is the dark matter solution a good bet ?

At the end of 2008, the PAMELA collaboration has released its measurements of the local cosmic ray positron fraction, seemingly confirming an excess with respect to the current predictions of the secondary positron background between 10 GeV up to around 100 GeV. In the same time the ATIC balloon has unveiled a prominent feature in the cosmic electron + positron spectrum around 600 GeV, though not confirmed by the more recent Fermi data. It has been well known for a long time that standard astrophysical sources, like pulsars and supernova remnants could explain both these features, but there could also be contributions from dark matter annihilation. We will discuss this issue in the light of our recent (and ongoing) theoretical works on cosmic ray electrons and positrons (secondaries and primaries, standard as well as of exotic origin).

 

 

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Laboratoire Astrophysique de Toulouse - Tarbes (UMR5572)

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