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Constraints on Primordial Non-Gaussianity from a Needlet Analysis of the WMAP-5 Data
Davide Pietrobon, Paolo Cabella, Amedeo Balbi +2
We look for a non-Gaussian signal in the WMAP 5-year temperature anisotropy maps by performing a needlet-based data analysis. We use the foreground-reduced maps obtained by the WMA…
Needlet Detection of Features in WMAP CMB Sky and the Impact on Anisotropies and Hemispherical Asymmetries
Davide Pietrobon, Alexandre Amblard, Amedeo Balbi +3
We apply spherical needlets to the Wilkinson Microwave Anisotropy Probe 5-year cosmic microwave background (CMB) dataset, to search for imprints of non-isotropic features in the CM…
Affine parameterization of the dark sector: costraints from WMAP5 and SDSS
Davide Pietrobon, Amedeo Balbi, Marco Bruni +1
We study a set of universe models where the dark sector is described by a perfect fluid with an affine equation of state , focusing specifically on cosmological perturbat…
Mapping the galactic gravitational potential with peculiar acceleration
Claudia Quercellini, Luca Amendola, Amedeo Balbi
It has been suggested recently that the change in cosmological redshift (the Sandage test of expansion) could be observed in the next generation of large telescopes and ultra-stabl…
Late universe dynamics with scale-independent linear couplings in the dark sector
Claudia Quercellini, Marco Bruni, Amedeo Balbi +1
We explore the dynamics of cosmological models with two coupled dark components with energy densities and . We assume that the coupling is of the form , s…