Two shadows on two backlights: forecasting the Ly-α forest × CMB Lensing bispectrum from ACT/SO/S4 DESI
arxiv(2024)
摘要
We forecast the sensitivity of future correlations between CMB lensing and
the Lyman-α forest power spectrum. This squeezed-limit bispectrum probes
the connection between the Lyman-α transmission and the underlying
large-scale matter density field. We recover the measured signal-to-noise (SNR)
ratio obtained with Planck×BOSS, and forecast a SNR of 10.3, 14.8 and
20.2 for DESI combined with ACT, SO and CMB-S4 respectively. For DESI and
SO/CMB-S4, the correlation should be detectable at SNR≥ 5 in 5 redshift
bins, useful for distinguishing our signal from several contaminants.Indeed,
our forecast is affected by large theoretical uncertainties in the current
modeling of the signal and its contaminants, such as continuum misestimation
bias or damped-Lyman-α absorbers. Quantifying these more accurately will
be crucial to enable a reliable cosmological interpretation of this observable
in future measurements. We attempt to enumerate the features required in future
Lyman-α forest simulations required to do so.
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