Extended analysis of CMB constraints on non-gaussianity in isocurvature perturbations
Extended analysis of CMB constraints on non-gaussianity in isocurvature perturbations
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DOI：
10.1088/1475-7516/2013/03/020
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发表时间：
2013
影响因子：
6.4
通讯作者：
Chiaki Hikage;Masahiro Kawasaki;Toyokazu Sekiguchi;Tomo Takahashi
中科院分区：
文献类型：
--
作者：
Chiaki Hikage;Masahiro Kawasaki;Toyokazu Sekiguchi;Tomo Takahashi
We study CMB constraints on non-Gaussianity from isocurvature perturbations of general types. Specifically, we study CDM/neutrino isocurvature perturbations which are uncorrelated or totally correlated with adiabatic ones. Using the data from the WMAP 7-year observation at V and W bands, we obtained optimal constraints on the nonlinearity parameters of adiabatic and isocurvature perturbations. Our result shows that primordial perturbations are consistent with Gaussian ones at around 2σ level for above mentioned isocurvature modes.
