Journal
PHYSICAL REVIEW LETTERS
Volume 93, Issue 7, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.93.071302
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We reformulate cosmological perturbations in the decaying cold dark matter model, and calculate cosmological microwave background anisotropies. By comparing our predictions with data from the Wilkinson Microwave Anisotropy Probe, we derive a new bound on the abundance and lifetime of decaying dark matter particles. The lifetime is constrained to Gamma(-1)greater than or equal to123 Gyr at 68% C.L. (52 Gyr at 95.4% C.L.) when cold dark matter consists only of such decaying particles. We also consider a more general case and show that the constraint generalizes to Omega(DDM)h(2)less than or similar to-0.5(Gamma(-1)/1 Gyr)(-1)+0.12 for Gamma(-1)greater than or equal to5 Gyr at 95.4% C.L.
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