Professor Pedro Ferreira: Publications

The cosmic microwave background

PHYSICS WORLD 16:4 (2003) 27-32

The trispectrum of the cosmic microwave background on subdegree angular scales: an analysis of the BOOMERanG data

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 343:1 (2003) 284-292

Authors:

G De Troia, PAR Ade, JJ Bock, JR Bond, A Boscaleri, CR Contaldi, BP Crill, P de Bernardis, PG Ferreira, M Giacometti, E Hivon, VV Hristov, M Kunz, AE Lange, S Masi, PD Mauskopf, T Montroy, P Natoli, CB Netterfield, E Pascale, F Piacentini, G Polenta, G Romeo, JE Ruhl

CONSTRAINTS ON COSMOLOGICAL PARAMETERS FROM MAXIMA-1

World Scientific Publishing (2002) 2195-2196

Authors:

A BALBI, P ADE, J BOCK, J BORRILL, A BOSCALERI, P DE BERNARDIS, PG FERREIRA, S HANANY, V HRISTOV, AH JAFFE, AT LEE, S OH, E PASCALE, B RABII, PL RICHARDS, GF SMOOT, R STOMPOR, CD WINANT, JHP WU

Multiple Methods for Estimating the Bispectrum of the Cosmic Microwave Background with Application to the MAXIMA Data

(2002)

Authors:

MG Santos, A Heavens, A Balbi, J Borrill, PG Ferreira, S Hanany, AH Jaffe, AT Lee, B Rabii, PL Richards, GF Smoot, R Stompor, CD Winant, JHP Wu

Multiple Methods for Estimating the Bispectrum of the Cosmic Microwave Background with Application to the MAXIMA Data

ArXiv astro-ph/0211123 (2002)

Authors:

MG Santos, A Heavens, A Balbi, J Borrill, PG Ferreira, S Hanany, AH Jaffe, AT Lee, B Rabii, PL Richards, GF Smoot, R Stompor, CD Winant, JHP Wu

Abstract:

We describe different methods for estimating the bispectrum of Cosmic Microwave Background data. In particular we construct a minimum variance estimator for the flat-sky limit and compare results with previously-studied frequentist methods. Application to the MAXIMA dataset shows consistency with primordial Gaussianity. Weak quadratic non-Gaussianity is characterised by a tunable parameter $f_{NL}$, corresponding to non-Gaussianity at a level $\sim 10^{-5}f_{NL}$ (ratio of non-Gaussian to Gaussian terms), and we find limits of $|f_{NL}|<950$ for the minimum-variance estimator and $|f_{NL}|<1650$ for the usual frequentist estimator. These are the tightest limits on primordial non-Gaussianity which include the full effects of the radiation transfer function.

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