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November 6 2012

Doubt cast on Fermi's dark matter smoking gun


It was hailed as a smoking gun for dark matter, raising hopes that we might finally pinpoint the particle that is thought to make up 80 per cent of the mass in the universe. But purported evidence of dark matter interactions in the centre of our galaxy may not be as solid as hoped.

Most physicists think dark matter is made of weakly interacting massive particles, or WIMPs, which only interact with normal matter via gravity. When two WIMPs meet, they should annihilate and spew out new particles, including high-energy gamma rays.

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