Kavli Affiliate: Blake Sherwin
| First 5 Authors: Darby Kramer, Alexander van Engelen, Christopher Cain, Niall MacCrann, Hy Trac
| Summary:
The kinetic Sunyaev-Zel’dovich effect (kSZ) and patchy screening effect are
two complementary cosmic microwave background (CMB) probes of the reionization
era. The kSZ effect is a relatively strong signal, but is difficult to
disentangle from other sources of temperature anisotropy, whereas patchy
screening is weaker but can be reconstructed using the cleaner polarization
channel. Here, we explore the potential of using upcoming CMB surveys to
correlate a reconstructed map of patchy screening with (the square of) the kSZ
map, and what a detection of this cross-correlation would mean for reionization
science. To do this, we use simulations and theory to quantify the
contributions to this signal from different redshifts. We then use the expected
survey properties for CMB-S4 and CMB-HD to make detection forecasts. We find
that, for or our fiducial reionization scenario, CMB-S4 will obtain a hint of
this signal at up to 1.8$sigma$, and CMB-HD will detect it at up to
14$sigma$. We explore the physical interpretation of the signal and find that
it is uniquely sensitive to the first half of reionization and to the
bispectrum of the ionized gas distribution.
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