Gamma rays from galaxy centre may signify less massive missing particles.
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References
Knödlseder, J. et al. Astronomy and Astrophysics , (in the press). Preprint: http://www.arxiv.org/abs/astro-ph/0309442
Boehm, C., Hooper, D., Silk, J., Casse, M. & Paul, J. J. Phys. Rev. Lett, 92, 101301, doi:10.1103/PhysRevLett.92.101301 (2003).
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Ball, P. Dark matter could be light. Nature (2004). https://doi.org/10.1038/news040315-6
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DOI: https://doi.org/10.1038/news040315-6