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Possible evidence for MeV dark matter in dwarf spheroidals.

Phys Rev Lett 93:16 (2004) 161302

Authors:

Dan Hooper, Francesc Ferrer, Céline Boehm, Joseph Silk, Jacques Paul, N Wyn Evans, Michel Casse

Abstract:

The observed 511 keV emission from the galactic bulge could be due to very light (MeV) annihilating dark matter particles. To distinguish this hypothesis from conventional astrophysical sources, we study dwarf spheroidals in the region observed by the International Gamma-Ray Astrophysics Laboratory/SPI such as Sagittarius. As these galaxies have comparatively few stars, the prospects for 511 keV emission from standard astrophysical scenarios are minimal. The dwarf spheroidals do, however, contain copious amounts of dark matter. The observation of 511 keV emission from Sagittarius should be a "smoking gun" for MeV dark matter.
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The Case for Nongaussianity on Cluster Scales

Monthly Notices of the Royal Astronomical Society 353 (2004) 681-688

Authors:

JI Silk, H. Mathis, J. Diego
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Initial conditions of the Universe: How Much Isocurvature is Allowed?

Physical Review Letters 93 (2004) 081301 4pp

Authors:

P Ferreira, M. Bucher, K. Moodley, J. Dunkley
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Constraints on isocurvature models from the WMAP first-year data

(2004)

Authors:

K Moodley, M Bucher, J Dunkley, PG Ferreira, C Skordis
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Simulation of non-Gaussian CMB maps

(2004)

Authors:

Graca Rocha, MP Hobson, Sarah Smith, Pedro Ferreira, Anthony Challinor
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