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If moduli, or other long-lived heavy states, decay in the early universe inpart into light and feebly interacting particles (such as axions), these decayproducts could account for the additional energy density in radiation that issuggested by recent measurements of the CMB. These moduli decays will also,however, alter the expansion history of the early universe, potentiallydiluting the thermal relic abundance of dark matter. If this is the case, thendark matter particles must annihilate with an even lower cross section thanrequired in the standard thermal scenario (sigma v < 3x10^-26 cm^3/s) if theyare to make up the observed density of dark matter. This possibility hassignificant implications for direct and indirect searches for dark matter.

Is the CMB telling us that dark matter is weaker than weakly interacting?