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.
@article{arxiv.1806.09625,
title = {Constraining the Expansion History and Early Dark Energy with Line Intensity Mapping},
author = {Kirit S. Karkare and Simeon Bird},
journal= {arXiv preprint arXiv:1806.09625},
year = {2018}
}
Comments
9 pages, 3 figures. Updated to reflect published version