Measuring the cosmological density field twice: A novel test of dark energy using the CMB quadrupole
arXiv:2202.11332 · doi:10.1103/PhysRevD.105.063507
Abstract
The scattering of cosmic microwave background (CMB) radiation in galaxy clusters induces polarization signals according to the quadrupole anisotropy in the photon distribution at the cluster location. This `remote quadrupole' derived from the measurements of the induced polarization provides an opportunity for reconstructing primordial fluctuations on large scales. We discuss that comparing the local CMB quadrupoles predicted by these reconstructed primordial fluctuations and the direct measurements done by CMB satellites may enable us to test the dark energy beyond cosmic variance limits.
arXiv comment6 pages, 3 figures, accepted version
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