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Probing primordial non Gaussianity in the BOOMERanG CMB maps: an analysis based on analytical Minkowski functionals

Migliaccio, M., Natoli, P., De Troia, G., Hikage, Chiaki, Komatsu, E., Ade, Peter A. R., Bock, J. J., Bond, J. R., Borrill, J., Boscaleri, A., Contaldi, C. R., Crill, B. P., de Bernardis, P., de Gasperis, G., de Oliveira-Costa, A., Di Stefano, G., Hivon, E., Kisner, T. S., Jones, W. C., Lange, A. E., Masi, S., Mauskopf, Philip Daniel, MacTavish, C. J., Melchiorri, A., Montroy, T. E., Netterfield, C. B., Pascale, Enzo, Piacentini, F., Polenta, G., Ricciardi, S., Romeo, G., Ruhl, J. E., Tegmark, M., Veneziani, M. and Vittorio, N. 2009. Probing primordial non Gaussianity in the BOOMERanG CMB maps: an analysis based on analytical Minkowski functionals. Nuclear Physics B - Proceedings Supplements 194 , pp. 278-286. 10.1016/j.nuclphysbps.2009.07.092

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Minkowski functionals are a powerful tool to constrain the Gaussianity of the Cosmic Microwave Background (CMB). In the limit of a weakly non Gaussian field, a perturbative approach can be derived [Hikage C., Komatsu E., & Matsubara T., 2006, ApJ, 653, 11] that is completely based on analytical formulae without requiring computationally intensive, dedicated Monte Carlo non Gaussian simulations of the CMB anisotropy. We apply this machinery to an intensity map derived from the 1998 and 2003 flights of BOOMERanG, analyzed here together for the first time. We set limits on the non-linear coupling parameter fNL as −1020<fNL<390 at 95% CL, markedly improving the previous constraints set by [De Troia G. et al., 2007, ApJ, 670, L73] whose analysis was limited to the BOOMERanG 2003 dataset. These limits are the most stringent ever set among suborbital experiments.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Physics and Astronomy
Subjects: Q Science > QB Astronomy
Publisher: Elsevier
ISSN: 0920-5632
Last Modified: 11 Feb 2021 02:38

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