Ben Wandelt (University of Illinois)
"Baryon-Dark Matter Interactions"


I will discuss recent progress in using astrophysical observations to constrain the dark matter - baryon scattering cross section on different energy scales. Big Bang nucleosynthesis constrains baryon-dark matter interactions only very weakly, but observations of the gamma-ray background provide tight constraints at high energies. I will conclude by commenting on the potential importance of such interactions for damping small scale structure in CDM models.

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