Detecting Electron Density Fluctuations from Cosmic Microwave Background Polarization using a Bispectrum Approach
arXiv:1801.05396 · doi:10.1103/PhysRevD.97.123523
Abstract
Recent progress in high sensitivity Cosmic Microwave Background (CMB) polarization experiments opens up a window on large scale structure (LSS), as CMB polarization fluctuations on small angular scales can arise from a combination of LSS and ionization fluctuations in the late universe. Gravitational lensing effects can be extracted from CMB datasets with quadratic estimators but reconstructions of electron density fluctuations (EDFs) with quadratic estimators are found to be significantly biased by the much larger lensing effects in the secondary CMB fluctuations. In this paper we establish a bispectrum formalism using tracers of LSS to extract the subdominant EDFs from CMB polarization data. We find that this bispectrum can effectively reconstruct angular band-powers of cross correlation between EDFs and LSS tracers. Next generation CMB polarization experiments in conjunction with galaxy surveys and cosmic infrared background experiments can detect signatures of EDFs with high significance.
6 pages, 3 figures
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Cited by in corpus (5)
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- Constraining reionization with the first measurement of the cross-correlation between the CMB optical-depth fluctuations and the Compton y-map
- Searching for patchy reionization from cosmic microwave background with hybrid quadratic estimators
- A new "temperature inversion" estimator to detect CMB patchy screening by large-scale structure