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Title:
Lensed CMB temperature and polarization maps from the Millennium Simulation
Authors:
Carbone, Carmelita; Baccigalupi, Carlo; Bartelmann, Matthias; Matarrese, Sabino; Springel, Volker
Affiliation:
AA(Institut de Ciències de l'Espai, CSIC/IEEC, Campus UAB, F. de Ciències, Torre C5 par-2, Barcelona 08193, Spain), AB(SISSA/ISAS, Astrophysics Sector, Via Beirut 4, I-34014, Trieste, Italy; INFN, Sezione di Trieste, Via Valerio, 2, 34127, Trieste, Italy), AC(Institut für Theoretische Astrophysik, Universität Heidelberg, Tiergartenstrasse 15, D-69121, Heidelberg, Germany), AD(Dipartimento di Fisica `Galileo Galilei', Università di Padova, Italy; INFN, Sezione di Padova, Via Marzolo 8, I-35131 Padova, Italy), AE(Max-Planck-Institute for Astrophysics, Karl-Schwarzschild-Str. 1, D-85741 Garching bei München, Germany)
Publication:
Monthly Notices of the Royal Astronomical Society, Volume 396, Issue 2, pp. 668-679. (MNRAS Homepage)
Publication Date:
06/2009
Origin:
MNRAS
Astronomy Keywords:
gravitational lensing , cosmic microwave background
DOI:
10.1111/j.1365-2966.2009.14746.x
Bibliographic Code:
2009MNRAS.396..668C

Abstract

We have constructed the first all-sky cosmic microwave background (CMB) temperature and polarization lensed maps based on a high-resolution cosmological N-body simulation, the Millennium Simulation (MS). We have exploited the lensing potential map obtained using a previously developed map-making procedure which integrates along the line-of-sight the MS dark matter distribution by stacking and randomizing the simulation boxes up to z = 127, and which semi-analytically supplies the large-scale power in the angular lensing potential that is not correctly sampled by the N-body simulation. The lensed sky has been obtained by properly modifying the latest version of the LensPix code to account for the MS structures. We have also produced all-sky lensed maps of the so-called ψE and ψB potentials, which are directly related to the electric and magnetic types of polarization. The angular power spectra of the simulated lensed temperature and polarization maps agree well with semi-analytic estimates up to l <= 2500, while on smaller scales we find a slight excess of power which we interpret as being due to non-linear clustering in the MS. We also observe how non-linear lensing power in the polarized CMB is transferred to large angular scales by suitably misaligned modes in the CMB and the lensing potential. This work is relevant in view of the future CMB probes, as a way to analyse the lensed sky and disentangle the contribution from primordial gravitational waves.
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