کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1780803 1523862 2013 10 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Planck and the local Universe: Quantifying the tension
موضوعات مرتبط
مهندسی و علوم پایه فیزیک و نجوم نجوم و فیزیک نجومی
پیش نمایش صفحه اول مقاله
Planck and the local Universe: Quantifying the tension
چکیده انگلیسی

We use the latest Planck   constraints, and in particular constraints on the derived parameters (Hubble constant and age of the Universe) for the local universe and compare them with local measurements of the same quantities. We propose a way to quantify whether cosmological parameters constraints from two different experiments are in tension or not. Our statistic, TT, is an evidence ratio and therefore can be interpreted with the widely used Jeffrey’s scale. We find that in the framework of the ΛCDM model, the Planck inferred two dimensional, joint, posterior distribution for the Hubble constant and age of the Universe is in “strong” tension with the local measurements; the odds being ∼1:50. We explore several possibilities for explaining this tension and examine the consequences both in terms of unknown errors and deviations from the ΛCDM model. In some one-parameter ΛCDM model extensions, tension is reduced whereas in other extensions, tension is instead increased. In particular, small total neutrino masses are favored and a total neutrino mass above 0.15 eV makes the tension “highly significant” (odds ∼1:150). A consequence of accepting this interpretation of the tension is that the degenerate neutrino hierarchy is highly disfavored by cosmological data and the direct hierarchy is slightly favored over the inverse.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Physics of the Dark Universe - Volume 2, Issue 3, September 2013, Pages 166–175
نویسندگان
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