Fixing reionization's endpoint from Lyα forest data turns the CMB optical depth into a duration probe, placing the high value τ≈0.09 in ~2σ tension with SPT patchy kSZ limits.
CMB-S4 Decadal Survey APC White Paper
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abstract
We provide an overview of the science case, instrument configuration and project plan for the next-generation ground-based cosmic microwave background experiment CMB-S4, for consideration by the 2020 Decadal Survey.
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The CMB optical depth constrains the duration of reionization
Fixing reionization's endpoint from Lyα forest data turns the CMB optical depth into a duration probe, placing the high value τ≈0.09 in ~2σ tension with SPT patchy kSZ limits.