Reconstruction of the remote dipole and quadrupole fields from the kinetic Sunyaev Zel'dovich and polarized Sunyaev Zel'dovich effects
Phys. Rev. D 98, 123501 (2018) The kinetic Sunyaev Zel'dovich (kSZ) and polarized Sunyaev Zel'dovich (pSZ) effects are temperature and polarization anisotropies induced by the scattering of CMB photons from structure in the post-reionization Universe. In the case of the kSZ effect, small a...
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Main Authors | , , , , |
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Format | Journal Article |
Language | English |
Published |
25.07.2017
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Subjects | |
Online Access | Get full text |
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Summary: | Phys. Rev. D 98, 123501 (2018) The kinetic Sunyaev Zel'dovich (kSZ) and polarized Sunyaev Zel'dovich (pSZ)
effects are temperature and polarization anisotropies induced by the scattering
of CMB photons from structure in the post-reionization Universe. In the case of
the kSZ effect, small angular scale anisotropies in the optical depth are
modulated by the cosmic microwave background (CMB) dipole field, i.e. the CMB
dipole observed at each spacetime point, which is sourced by the primordial
dipole and especially the local peculiar velocity. In the case of the pSZ
effect, similar small-scale anisotropies are modulated by the CMB quadrupole
field, which receives contributions from both scalar and tensor modes.
Statistical anisotropies in the cross correlations of CMB temperature and
polarization with tracers of the inhomogeneous distribution of electrons
provide a means of isolating and reconstructing the dipole and quadrupole
fields. In this paper, we present a set of unbiased minimum variance quadratic
estimators for the reconstruction of the dipole and quadrupole fields, and
forecast the ability of future CMB experiments and large scale structure
surveys to perform this reconstruction. Consistent with previous work, we find
that a high fidelity reconstruction of the dipole and quadrupole fields over a
variety of scales is indeed possible, and demonstrate the sensitivity of the
pSZ effect to primordial tensor modes. Using a principle component analysis, we
estimate how many independent modes could be accessed in such a reconstruction.
We also comment on a few first applications of a detection of the dipole and
quadrupole fields, including a reconstruction of the primordial contribution to
our locally observed CMB dipole, a test of statistical homogeneity on large
scales from the first modes of the quadrupole field, and a reconstruction
technique for the primordial potential on the largest scales. |
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DOI: | 10.48550/arxiv.1707.08129 |