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Title:
Full-sky maps for gravitational lensing of the cosmic microwave background
Authors:
Carbone, Carmelita; Springel, Volker; Baccigalupi, Carlo; Bartelmann, Matthias; Matarrese, Sabino
Affiliation:
AA(SISSA/ISAS, Astrophysics Sector, Via Beirut 4, I-34014, Trieste, Italy; INFN, Sezione di Trieste, Via Valerio 2, 34127, Trieste, Italy), AB(Institut de Ciències de l'Espai, CSIC/IEEC, Campus UAB, F. de Ciències, Torre C5 par-2, Barcelona 08193, Spain), AC(SISSA/ISAS, Astrophysics Sector, Via Beirut 4, I-34014, Trieste, Italy), AD(Max-Planck-Institute for Astrophysics, Karl-Schwarzschild-Str. 1, D-85741 Garching bei München, Germany), AE(Institut für Theoretische Astrophysik, Universität Heidelberg, Tiergartenstrasse 15, D-69121, Heidelberg, Germany)
Publication:
Monthly Notices of the Royal Astronomical Society, Volume 388, Issue 4, pp. 1618-1626. (MNRAS Homepage)
Publication Date:
08/2008
Origin:
MNRAS
Astronomy Keywords:
gravitational lensing , cosmic microwave background
DOI:
10.1111/j.1365-2966.2008.13544.x
Bibliographic Code:
2008MNRAS.388.1618C

Abstract

We use the large cosmological Millennium Simulation (MS) to construct the first all-sky maps of the lensing potential and the angle, aiming at gravitational lensing of the cosmic microwave background (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 ~ 11, producing continuous all-sky maps with arcmin angular resolution. A randomization scheme avoids the 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 arcmin, 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 analysing cross-correlations with foreground structures, or other secondary CMB anisotropies such as the Rees-Sciama effect.
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