Extended analysis of CMB constraints on non-gaussianity in isocurvature perturbations

Journal Article · Fri Mar 01 00:00:00 EST 2013 · Journal of Cosmology and Astroparticle Physics

DOI:https://doi.org/10.1088/1475-7516/2013/03/020· OSTI ID:22282958

Hikage, Chiaki ^[1]; Kawasaki, Masahiro ^[2]; Sekiguchi, Toyokazu ^[3]; Takahashi, Tomo ^[4]

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1. Kobayashi-Maskawa Institute, Nagoya University, Nagoya 464-8602 (Japan)
2. Institute for Cosmic Ray Research, University of Tokyo, Kashiwa 277-8582 (Japan)
3. Department of Physics and Astrophysics, Nagoya University, Nagoya 464-8602 (Japan)
4. Department of Physics, Saga University, Saga 840-8502 (Japan)

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.

• OSTI ID: 22282958
• Journal Information: Journal of Cosmology and Astroparticle Physics, Vol. 2013, Issue 03; Other Information: Country of input: International Atomic Energy Agency (IAEA); ISSN 1475-7516
• Country of Publication: United States
• Language: English

Related Subjects

79 ASTROPHYSICS
COSMOLOGY AND ASTRONOMY
ASTROPHYSICS
COSMOLOGY
DISTURBANCES
LIMITING VALUES
NEUTRINOS
NONLINEAR PROBLEMS
PERTURBATION THEORY
RELICT RADIATION