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Primordial non-Gaussian signatures in CMB polarization

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dc.contributor.author Vidhya, G
dc.contributor.author Pravabati, C
dc.contributor.author Yogendran, K. P
dc.contributor.author Park, C
dc.date.accessioned 2020-11-10T02:28:42Z
dc.date.available 2020-11-10T02:28:42Z
dc.date.issued 2015-02
dc.identifier.citation Journal of Cosmology and Astroparticle Physics, Vol. 2015, No. 2, 28 en_US
dc.identifier.issn 1475-7516
dc.identifier.uri http://prints.iiap.res.in/handle/2248/6726
dc.description Restricted Access © IOP Publishing http://dx.doi.org/10.1088/1475-7516/2015/02/028 en_US
dc.description.abstract We study the signatures of local type primordial non-Gaussianity, parametrized by fNL, of scalar perturbations in CMB polarization using the probability distribution functions, Minkowski Functionals and Betti numbers. We show that the lowest order non-Gaussian deviation of the PDF of the total polarization intensity is at order (fNLσ)2. We calculate the non-Gaussian deviations of Minkowski Functionals and Betti numbers from simulated polarization maps. If observational issues such as instrumental noise are ignored, we find that E mode polarization provides independent and equally strong constraint on fNL as temperature fluctuations. The constraint is expected to weaken when observational issues are included since the signal-to-noise ratio of polarization data is lower than that of temperature. The non-Gaussian signal in the total polarization intensity, however, is much weaker and has a relatively large cosmic variance and hence may not be useful for detecting local type non-Gaussianity. en_US
dc.language.iso en en_US
dc.publisher IOP Publishing en_US
dc.subject Non-gaussianity en_US
dc.subject CMBR polarization parameters en_US
dc.title Primordial non-Gaussian signatures in CMB polarization en_US
dc.type Article en_US


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