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Constraining the Expansion History and Early Dark Energy with Line Intensity Mapping
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We consider the potential for line intensity mapping (IM) experiments to measure the baryon acoustic oscillations (BAO) from 3 < z < 6. This would constrain the expansion history in a redshift range that is currently unexplored. We calculate the map depths that future IM experiments targeting the CO(1-0) rotational transition line and [CII] ionized carbon fine-structure line would need to achieve in order to measure the BAO. We find that near-future IM experiments could constrain the BAO scale to 5% or better depending on CO/[CII] model amplitude. This measurement is at a precision that could make competitive constraints on models of early dark energy.
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Cited by 2 Pith papers
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Delensing Degree-Scale $B$-Mode Polarization with High-Redshift Line Intensity Mapping
High-redshift line intensity mapping could add about 11 percent to CMB-S4 delensing performance, but only if line-of-sight density modes survive foreground removal.
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Reading Between the Lines: Forward Modeling Dust, Continuum, and Spectral Cleaning for Multi-Line Intensity Mapping
Using a SAM-based mock, multi-line intensity-mapping cross-power spectra show dust acts as a line-pair- and redshift-dependent suppression, and PCA cleaning with about 20 modes best balances line recovery against cont...
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