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Imprints of primordial non-Gaussianities in X-ray and SZ signals from galaxy clusters
M. Roncarelli, L. Moscardini, E. Branchini +4
Several inflationary models predict the possibility that the primordial perturbations of the density field may contain a degree of non-Gaussianity which would influence the subsequ…
Anisotropic Trispectrum of Curvature Perturbations Induced by Primordial Non-Abelian Vector Fields
Nicola Bartolo, Emanuela Dimastrogiovanni, Sabino Matarrese +1
Motivated by the interest in models of the early universe where statistical isotropy is broken and can be revealed in cosmological observations, we consider an SU(2) theory of gaug…
Detectability of the effect of Inflationary non-Gaussianity on halo bias
Licia Verde, Sabino Matarrese
We consider the description of the clustering of halos for physically-motivated types of non-Gaussian initial conditions. In particular we include non-Gaussianity of the type arisi…
The High Redshift Integrated Sachs-Wolfe Effect
Jun-Qing Xia, Matteo Viel, Carlo Baccigalupi +1
In this paper we rely on the quasar (QSO) catalog of the Sloan Digital Sky Survey Data Release Six (SDSS DR6) of about one million photometrically selected QSOs to compute the Inte…
Anisotropic bispectrum of curvature perturbations from primordial non-Abelian vector fields
Nicola Bartolo, Emanuela Dimastrogiovanni, Sabino Matarrese +1
We consider a primordial SU(2) vector multiplet during inflation in models where quantum fluctuations of vector fields are involved in producing the curvature perturbation. Recentl…
Directional Variations of the Non-Gaussianity Parameter f_NL
Øystein Rudjord, Frode K. Hansen, Xiaohong Lan +3
We investigate local variations of the primordial non-Gaussianity parameter f_NL in the WMAP data, looking for possible influence of foreground contamination in the full-sky estima…