7–14 mars 2009
La Thuile
Fuseau horaire Europe/Paris

Pamela and ATIC - an Astrophysicist View

11 mars 2009, 10:45
25m
La Thuile

La Thuile

Rencontres de Moriond Planibel Hotel - La Thuile Aosta Valley 11016 La Thuile (Aosta), Italy Phone : 39 (0)1 65 88 45 41 Fax : 39 (0)1 65 88 45 35

Orateur

Prof. Tsvi Piran (Racah Institute for Physics Hebrew University Jerusalem Israel)

Description

I review the astrophysical issues that are at the heart of the Pamela and ATIC observations. Specifically I stress the importance of diffusion and escape of Cosmic Rays from the Galaxy as well as the issue of cooling of Cosmic Ray leptons while traveling in the Galaxy. I summarize various astrophysical resolutions of these two observations. I then present a novel idea - the concentration of cosmic ray sources, SNRs, in the spiral arms (that was previously ignored) explains naturally both results in a model whose only parameters are direct observable quantities. That is - it is quite likely that both experiments don't require either new physics (WIMPS) or new Astrophysical sources.

Auteur principal

Prof. Tsvi Piran (Racah Institute for Physics Hebrew University Jerusalem Israel)

Co-auteurs

Dr Ehud Nakar (Tel Aviv University) Prof. Nir Shaviv (Racah Institute for Physics Hebrew University Jerusalem Israel)

Documents de présentation