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 [14] 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 f(NL) as -1020 < f(NL) < 390 at 95% CL, markedly improving the previous constraints set by 191 whose analysis was limited to the BOOMERanG 2003 dataset. These limits are the most stringent ever set among suborbital experiments.
Probing primordial non Gaussianity in the BOOMERanG CMB maps: an analysis based on analytical Minkowski functionals / M., Migliaccio; P., Natoli; DE TROIA, Grazia; C., Hikage; E., Komatsu; P. A. R., Ade; J. J., Bock; J. R., Bond; J., Borrill; A., Boscaleri; C. R., Contaldi; B. P., Crill; DE BERNARDIS, Paolo; G., De Gasperis; A., De Oliveira Costa; G., Di Stefano; E., Hivon; T. S., Kisner; W. C., Jones; A. E., Lange; Masi, Silvia; P. D., Mauskopf; C. J., Mactavish; Melchiorri, Alessandro; T. E., Montroy; C. B., Netterfield; Pascale, Enzo; Piacentini, Francesco; Polenta, Gianluca; Ricciardi, Sara; G., Romeo; J. E., Ruhl; M., Tegmark; Veneziani, Marcella; N., Vittorio. - In: NUCLEAR PHYSICS B-PROCEEDINGS SUPPLEMENTS. - ISSN 0920-5632. - 194:C(2009), pp. 278-286. (Intervento presentato al convegno Galileo-Galilei-Institute Conference on Dark Matter and Dark Energy tenutosi a Florence; Italy) [10.1016/j.nuclphysbps.2009.07.092].
Probing primordial non Gaussianity in the BOOMERanG CMB maps: an analysis based on analytical Minkowski functionals
DE TROIA, Grazia;DE BERNARDIS, Paolo;G. De Gasperis;MASI, Silvia;MELCHIORRI, Alessandro;PASCALE, ENZO;PIACENTINI, Francesco;POLENTA, GIANLUCA;RICCIARDI, Sara;VENEZIANI, MARCELLA;
2009
Abstract
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 [14] 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 f(NL) as -1020 < f(NL) < 390 at 95% CL, markedly improving the previous constraints set by 191 whose analysis was limited to the BOOMERanG 2003 dataset. These limits are the most stringent ever set among suborbital experiments.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
