Results from PAMELA, ATIC and FERMI : Pulsars or Dark Matter ?

Details Results from PAMELA, ATIC and FERMI : Pulsars or Dark Matter ? Results from PAMELA, ATIC and FERMI : Pulsars or Dark Matter ?

2009-09-07

arxiv.org/abs/0909.1182v3

Pramana 76:1-22,2011

Astronomy and Astrophysics

Astrophysics

High Energy Astrophysical Phenomena

27 Pages, extensively revised and significantly extended, to appear in Pramana as topical review

Scientific paper

10.1007/s12043-011-0019-1

It is well known that the dark matter dominates the dynamics of galaxies and clusters of galaxies. Its constituents remain a mystery despite an assiduous search for them over the past three decades. Recent results from the satellite-based PAMELA experiment detect an excess in the positron fraction at energies between 10-100 GeV in the secondary cosmic ray spectrum. Other experiments namely ATIC, HESS and FERMI show an excess in the total electron (\ps + \el) spectrum for energies greater 100 GeV. These excesses in the positron fraction as well as the electron spectrum could arise in local astrophysical processes like pulsars, or can be attributed to the annihilation of the dark matter particles. The second possibility gives clues to the possible candidates for the dark matter in galaxies and other astrophysical systems. In this article, we give a report of these exciting developments.

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