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Non-thermal WIMPs as "Dark Radiation" in Light of ATACAMA, SPT, WMAP9 and Planck
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The Planck and WMAP9 satellites, as well as the ATACAMA and South Pole telescopes, have recently presented results on the angular power spectrum of the comic microwave background. Data tentatively point to the existence of an extra radiation component in the early universe. Here, we show that this extra component can be mimicked by ordinary WIMP dark matter particles whose majority is cold, but with a small fraction being non-thermally produced in a relativistic state. We present a few example theories where this scenario is explicitly realized, and explore the relevant parameter space consistent with BBN, CMB and Structure Formation bounds.
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Updated BBN Bounds on Hadronic Injection in the Early Universe: The Gravitino Problem
With current light-element abundances, hadronic decays of long-lived particles are excluded above a yield curve in lifetime, and for gravitinos this translates into reheating temperature upper limits as low as 5×10^5 GeV.
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