Decaying dark matter can explain the e{sup {+-}} excesses

Journal Article · Thu Jan 15 00:00:00 EST 2009 · Journal of Cosmology and Astroparticle Physics

DOI:https://doi.org/10.1088/1475-7516/2009/01/043· OSTI ID:22156881

Nardi, Enrico ^[1]; Sannino, Francesco ^[2]; Strumia, Alessandro ^[3]

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1. INFN, Laboratori Nazionali di Frascati, via Enrico Fermi 40, I-00044 Frascati (Italy)
2. Center for High Energy Physics, University of Southern Denmark, Campusvej 55, DK-5230 Odense M (Denmark)
3. Dipartmento di Fisica dell'Universita di Pisa e INFN, Largo Bruno Pontecorvo 3, I-56127 Pisa (Italy)

PAMELA and ATIC recently reported excesses in e{sup {+-}} cosmic rays. Since the interpretation in terms of DM annihilations was found to be not easily compatible with constraints from photon observations, we consider the DM decay hypothesis and find that it can explain the e{sup {+-}} excesses compatibly with all constraints, and can be tested by dedicated HESS observations of the Galactic Ridge. ATIC data indicate a DM mass of about 2 TeV: this mass naturally implies the observed DM abundance relative to ordinary matter if DM is a quasi-stable composite particle with a baryon-like matter asymmetry. Technicolor naturally yields these type of candidates.

• OSTI ID: 22156881
• Journal Information: Journal of Cosmology and Astroparticle Physics, Vol. 2009, Issue 01; Other Information: Country of input: International Atomic Energy Agency (IAEA); ISSN 1475-7516
• Country of Publication: United States
• Language: English

Related Subjects

79 ASTROPHYSICS
COSMOLOGY AND ASTRONOMY
ANNIHILATION
ASYMMETRY
BARYONS
COSMIC RADIATION
HYPOTHESIS
LIMITING VALUES
NONLUMINOUS MATTER
PHOTONS
TEV RANGE