Astronomy and Astrophysics – Astrophysics
Scientific paper
2008-08-13
Astronomy and Astrophysics
Astrophysics
v1: 17 pages, 8 figures; v2: published version (improvements in the text, comments added), 17 pages, 8 figures
Scientific paper
10.1088/1475-7516/2009/02/019
The detection of a "Cold Spot" in the CMB sky could be explained by the presence of an anomalously large spherical underdense region (with radius of a few hundreds Mpc/h) located between us and the Last Scattering Surface. Modeling such an underdensity with an LTB metric, we investigate whether it could produce significant signals on the CMB power spectrum and bispectrum, via the Rees-Sciama effect. We find that this leads to a bump on the power spectrum, that corresponds to an O(5%-25%) correction at multipoles 5 < l < 50; in the cosmological fits, this would modify the \chi^2 by an amount of order unity. We also find that the signal should be visible in the bispectrum coefficients with a signal-to-noise S/N ~ O (1-10), localized at 10 < l < 40. Such a signal would lead to an overestimation of the primordial f_{NL} by an amount \Delta f_{NL} ~ 1 for WMAP and by \Delta f_{NL} ~ 0.1 for Planck.
Masina Isabella
Notari Alessio
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