Full-sky maps for gravitational lensing of the CMB

Simple item page
dc.creatorCarbone, Carmelita
dc.creatorSpringel, Volker
dc.creatorBaccigalupi, Carlo
dc.creatorBartelmann, Matthias
dc.creatorMatarrese, Sabino
dc.date2007-11-16
dc.date2008-06-17
dc.date.accessioned2026-07-07T11:54:14Z
dc.date.available2026-07-07T11:54:14Z
dc.descriptionWe use the large cosmological Millennium Simulation (MS) to construct the first all-sky maps of the lensing potential and the deflection angle, aiming at gravitational lensing of the CMB, with the goal of properly including small-scale non-linearities and non-Gaussianity. Exploiting the Born approximation, we implement a map-making procedure based on direct ray-tracing through the gravitational potential of the MS. We stack the simulation box in redshift shells up to $z\sim 11$, producing continuous all-sky maps with arcminute angular resolution. A randomization scheme avoids repetition of structures along the line of sight and structures larger than the MS box size are added to supply the missing contribution of large-scale (LS) structures to the lensing signal. The angular power spectra of the projected lensing potential and the deflection-angle modulus agree quite well with semi-analytic estimates on scales down to a few arcminutes, while we find a slight excess of power on small scales, which we interpret as being due to non-linear clustering in the MS. Our map-making procedure, combined with the LS adding technique, is ideally suited for studying lensing of CMB anisotropies, for analyzing cross-correlations with foreground structures, or other secondary CMB anisotropies such as the Rees-Sciama effect.
dc.descriptionLaTeX file, 10 pages, MNRAS in press, scales larger than the Millennium Simulation box size semi-analytically added, maps changed, references added, typos corrected
dc.identifierhttps://arxiv.org/abs/0711.2655
dc.identifierhttp://arxiv.org/abs/0711.2655
dc.identifierMon.Not.Roy.Astron.Soc.388:1618,2008
dc.identifierdoi:10.1111/j.1365-2966.2008.13544.x
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/204823
dc.subjectAstrophysics
dc.titleFull-sky maps for gravitational lensing of the CMB
dc.typetext

Files

Collections

arXiv