期刊
PHYSICAL REVIEW D
卷 91, 期 10, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevD.91.103508
关键词
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资金
- STFC
- ESA
- CNES (France)
- CNRS/INSU-IN2P3-INP (France)
- ASI (Italy)
- CNR (Italy)
- INAF (Italy)
- NASA (USA)
- DoE (USA)
- STFC (UK)
- UKSA (UK)
- CSIC (Spain)
- MICINN (Spain)
- JA (Spain)
- RES (Spain)
- Tekes (Finland)
- AoF (Finland)
- CSC (Finland)
- DLR (Germany)
- MPG (Germany)
- CSA (Canada)
- DTU Space (Denmark)
- SER/SSO (Switzerland)
- RCN (Norway)
- SFI (Ireland)
- FCT/MCTES (Portugal)
- PRACE (EU)
- Science and Technology Facilities Council [ST/L000393/1, ST/K002805/1, ST/L000768/1, 1367092] Funding Source: researchfish
- STFC [ST/K002805/1, ST/J000388/1, ST/L000393/1, ST/L000768/1] Funding Source: UKRI
There is a tension between measurements of the amplitude of the power spectrum of density perturbations inferred using the cosmic microwave background (CMB) and directly measured by large-scale structure (LSS) on smaller scales. We show that this tension exists, and is robust, for a range of LSS indicators including clusters, lensing and redshift space distortions and using CMB data from either Planck or WMAP + SPT/ACT. One obvious way to try to reconcile this is the inclusion of a massive neutrino which could be either active or sterile. Using Planck and a combination of all the LSS data we find that (i) for an active neutrino Sigma m(nu) = (0.357 +/- 0.099) eV and (ii) for a sterile neutrino m(sterile)(eff) = (0.67 +/- 0.18) eV and Delta N-eff = 0.32 +/- 0.20. This is, however, at the expense of a degraded fit to Planck temperature data, and we quantify the residual tension at 2.5 sigma and 1.6 sigma for massive and sterile neutrinos, respectively. We also consider alternative explanations including a lower redshift for reionization that would be in conflict with polarization measurements made by WMAP and ad hoc modifications to the primordial power spectrum.
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