Is Dark Matter a Source of High Energy Gamma Rays?

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HESS telescope. Credit: HESS collaboration
HESS telescope. Credit: HESS collaboration

“We know there is much more matter in the universe than what we see. For instance, the rotation velocity of observed spiral galaxies is much faster than the visible mass could explain,” says Joachim Ripken, a researcher with the HESS Collaboration. “And we know that it is not the normal matter that we know.” Ripken refers to dark matter, a type of matter that physicists know must be present in the universe, but that cannot be seen because it does not interact with light. It is matter, Ripken tells PhysOrg.com, that “we only know what it is not.”


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