Strongest model-independent bound on the lifetime of Dark Matter
By B. Audren, Julien Lesgourgues, G. Mangano, P. Serpico, Thomas Tram. 2014
151 citations recorded by the source corpus.
Dark Matter is essential for structure formation in the late Universe so it must be stable on cosmological time scales. But how stable exactly? Only assuming decays into relativistic particles, we report an otherwise model independent bound on the lifetime of Dark Matter using current cosmological data. Since these decays affect only the low ℓ multipoles of the CMB, the Dark Matter lifetime is expected to correlate with the tensor-to-scalar ratio r as well as the curvature Ωk. We consider two models, including r and r+Ωk respectively, versus data from Planck, WMAP, WiggleZ and Baryon Acoustic Oscillations, with or without the BICEP2 data (if interpreted in terms of primordial gravitational waves). This results in a lower bound on the lifetime of CDM given by 160 Gyr (without BICEP2) or 200 Gyr (with BICEP2) at 95% confidence level.
Subfields: Astronomy and Astrophysics, Nuclear and High Energy Physics
View Paper: https://www.semanticscholar.org/paper/2a22b0326d94c4de584dd41d0d359bad884c7b28
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In Astronomy and Astrophysics
- V. Poulin
- Julien Lesgourgues
- P. Serpico
- M. Schmaltz
- G. Marques-Tavares
- E. M. Sessolo
- L. Roszkowski
- S. Trojanowski
In Nuclear and High Energy Physics
- Julien Lesgourgues
- V. Poulin
- M. Schmaltz
- P. Serpico
- L. Roszkowski
- S. Trojanowski
- E. M. Sessolo
- G. Marques-Tavares
Citations in the corpus
- WIMP dark matter candidates and searches—current status and future prospects (2017, background): “Finally, the DM particles should be either absolutely stable, or extremely long lived (for instance, a recent analysis finds a lower bound of 160 Gyr [57]).”
- Evidence for dark matter interactions in cosmological precision data? (2015, background): “[14]) that σ8 can only be slightly reduced.”
- A fresh look at linear cosmological constraints on a decaying Dark Matter component (2016, methodology): “[1], the scalar perturbations equations at zeroth and first order had been obtained starting from the continuity and Euler equations, which describes the exchange of energy and momenta between the decaying DM and the dark radiation.”