Lack of) Cosmological evidence for dark radiation after Planck
Lack of) Cosmological evidence for dark radiation after Planck
复制标题
缺乏）普朗克之后暗辐射的宇宙学证据
DOI：
--
复制
发表时间：
2013
期刊：
影响因子：
--
通讯作者：
H. Peiris
中科院分区：
文献类型：
--
作者：
L. Verde;S. Feeney;D. Mortlock;H. Peiris
我们使用贝叶斯模型比较来确定标准模型中微子物理学的扩展-主要是中微子和/或大质量中微子的额外有效数量-是否值得最新的宇宙学数据。鉴于以普朗克数据为代表的宇宙微波背景（CMB）观测取得了重大进展，我们研究了普朗克温度和CMB透镜数据，结合低红移数据，是否加强（或削弱）了之前的发现。我们的结论是，最先进的宇宙学数据并没有显示出偏离标准（ΛCDM）宇宙学模型（它有三个无质量的中微子族）的证据。这并不意味着这个模型一定是正确的——事实上，我们知道它是不完整的，因为中微子不是无质量的——但它确实意味着，与目前的实验不确定性相比，与标准模型的偏差（例如，非零中微子质量）太小了，无法仅从宇宙学数据中推断出来。
We use Bayesian model comparison to determine whether extensions to Standard-Model neutrino physics — primarily additional effective numbers of neutrinos and/or massive neutrinos — are merited by the latest cosmological data. Given the significant advances in cosmic microwave background (CMB) observations represented by the Planck data, we examine whether Planck temperature and CMB lensing data, in combination with lower redshift data, have strengthened (or weakened) the previous findings. We conclude that the state-of-the-art cosmological data do not show evidence for deviations from the standard (ΛCDM) cosmological model (which has three massless neutrino families). This does not mean that the model is necessarily correct — in fact we know it is incomplete as neutrinos are not massless — but it does imply that deviations from the standard model (e.g., non-zero neutrino mass) are too small compared to the current experimental uncertainties to be inferred from cosmological data alone.
DOI：
10.1111/j.1365-2966.2012.22066.x
发表时间：
2012-12-01
影响因子：
4.8
作者：
Anderson, Lauren;Aubourg, Eric;Zhao, Gong-Bo
通讯作者：
Zhao, Gong-Bo