Strongest model-independent bound on the lifetime of Dark MatterReport as inadecuate

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1 LAPTH - Laboratoire d-Annecy-le-Vieux de Physique Théorique

Abstract : Dark Matter is essential for structure formation in the late Universe so itmust be stable on cosmological time scales. But how stable exactly? Onlyassuming decays into relativistic particles, we report an otherwise modelindependent bound on the lifetime of Dark Matter using current cosmologicaldata. Since these decays affect only the low-$\ell$ multipoles of the CMB, theDark Matter lifetime is expected to correlate with the tensor-to-scalar ratio$r$ as well as curvature $\Omega k$. We consider two models, including $r$ and$r+\Omega k$ respectively, versus data from Planck, WMAP, WiggleZ and BaryonAcoustic Oscillations, with or without the BICEP2 data if interpreted in termsof primordial gravitational waves. This results in a lower bound on thelifetime of CDM given by 160Gyr without BICEP2 or 200Gyr with BICEP2 at 95%confidence level.

Author: B. Audren J. Lesgourgues - G. Mangano P. D. Serpico - T. Tram



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