Cosmology with post-EoR 21 cm Intensity Mapping surveys: power spectrum measurements in the last decade

@misc{ansari2026cosmology,
  title = {{Cosmology with post-EoR 21 cm Intensity Mapping surveys: power spectrum measurements in the last decade}},
  author = {Réza Ansari and Xuelei Chen and Albert Stebbins and Peter Timbie},
  howpublished = {arXiv},
  year = {2026},
  month = oct,
  doi = {10.48550/arxiv.2610.41940},
  eprint = {2610.41940},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/2610.41940},
}

TY  - UNPB
TI  - Cosmology with post-EoR 21 cm Intensity Mapping surveys: power spectrum measurements in the last decade
AU  - Réza Ansari
AU  - Xuelei Chen
AU  - Albert Stebbins
AU  - Peter Timbie
PY  - 2026
DA  - 2026/10/30
PB  - arXiv
DO  - 10.48550/arxiv.2610.41940
UR  - https://arxiv.org/abs/2610.41940
AB  - The technique of 21 cm intensity mapping (IM) is emerging as a possible, cost-effective method to supplement optical surveys to map the large-scale structure, and extend their redshift reach, with projects aiming to cover a large range of post-EoR redshifts, from z=0 to z=6. Since the early discussions 20 years ago, a few dedicated interferometers have been built, and surveys have been carried out using them as well as general purpose radio instruments. An introduction to late-time cosmology with 21 cm intensity mapping is given, highlighting the main scientific and technical challenges. We present then an overview of different instrument concepts and survey strategies, followed by a discussion of outstanding data analysis challenges, most notably the foreground subtraction, which is a major issue in IM. We carry on with a presentation of the currently active projects and the 21 cm signal measurements which have been obtained, either in cross-correlation with optical surveys, or as the autocorrelation power spectrum. Finally, we discuss briefly the prospects for this field with future instruments and surveys such as SKA, HIRAX and CHORD.
ER  -