Constraints on decaying dark matter from weak lensing and cluster counts
| Autor: | Seshadri Nadathur, Tomo Takahashi, Kari Enqvist, Toyokazu Sekiguchi |
|---|---|
| Přispěvatelé: | Department of Physics, Helsinki Institute of Physics |
| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: |
Cosmology and Nongalactic Astrophysics (astro-ph.CO)
gr-qc Dark matter Cosmic microwave background FOS: Physical sciences Astrophysics cosmological parameters from LSS General Relativity and Quantum Cosmology (gr-qc) Astrophysics::Cosmology and Extragalactic Astrophysics 01 natural sciences 114 Physical sciences General Relativity and Quantum Cosmology symbols.namesake cluster counts High Energy Physics - Phenomenology (hep-ph) 0103 physical sciences Planck Weak gravitational lensing STFC Physics ST/N00180X/1 010308 nuclear & particles physics Matter power spectrum Halo mass function Astrophysics::Instrumentation and Methods for Astrophysics RCUK cosmological parameters from CMBR Astronomy and Astrophysics hep-ph Baryon High Energy Physics - Phenomenology particle physics - cosmology connection Dark radiation symbols astro-ph.CO Astrophysics - Cosmology and Nongalactic Astrophysics |
| Zdroj: | Enqvist, K, Nadathur, S, Sekiguchi, T & Takahashi, T 2020, ' Constraints on decaying dark matter from weak lensing and cluster counts ', Journal of Cosmology and Astroparticle Physics, vol. 2020, no. 04, 015 . https://doi.org/10.1088/1475-7516/2020/04/015 |
| Popis: | We revisit a cosmological constraint on dark matter decaying into dark radiation at late times. In Enqvist et al. (2015), we mainly focused on the effects of decaying dark matter (DDM) on the cosmic microwave background (CMB) and nonlinear matter power spectrum. Extending our previous analysis, here we use N-body simulation to investigate how DDM affects the halo mass function. This allows us to incorporate the cluster counts observed by the Sunyaev-Zel'dovich effect to study a bound on the lifetime of DDM. We also update the data of CMB and cosmic shear power spectrum with the Planck 2015 results and KiDS450 observations, respectively. From these cosmological observations, we obtain an lower bound on the lifetime $\Gamma^{-1}\ge 175\,$Gyr from the Planck2015 results (CMB+SZ cluster count) combined with the KiDS450 and the recent measurements of the baryon acoustic scale. Comment: 12 pages, 5 figures, 1 table |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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