%0 Generic %1 hotinli2021probing %A Hotinli, Selim C. %A Binnie, Thomas %A Muñoz, Julian B. %A Dinda, Bikash R. %A Kamionkowski, Marc %D 2021 %K library %T Probing Compensated Isocurvature with the 21-cm Signal during Cosmic Dawn %U http://arxiv.org/abs/2106.11979 %X Upcoming measurements of the 21-cm line of neutral hydrogen will open a new observational window into the early stages of structure growth, providing a unique opportunity for probing large-scale cosmological signatures using the small-scale signals from the first stars. In this paper we evaluate the detection significance of compensated isocurvature perturbations (CIPs) from observations of the 21-cm hydrogen-line during the cosmic-dawn era. CIPs are modulations of the relative baryon and dark-matter density that leave the total matter density unchanged. We find that, under different assumptions for feedback and foregrounds, the ongoing HERA and upcoming SKA1-low experiments will provide constraints on uncorrelated CIPs at the level of $\sigma(A_\rm CIP)= 10^-3-10^-4$, comparable to the sensitivity of upcoming CMB experiments, and potentially exceeding the constraints from cosmic-variance limited BAO surveys.

@misc{hotinli2021probing, abstract = {Upcoming measurements of the 21-cm line of neutral hydrogen will open a new observational window into the early stages of structure growth, providing a unique opportunity for probing large-scale cosmological signatures using the small-scale signals from the first stars. In this paper we evaluate the detection significance of compensated isocurvature perturbations (CIPs) from observations of the 21-cm hydrogen-line during the cosmic-dawn era. CIPs are modulations of the relative baryon and dark-matter density that leave the total matter density unchanged. We find that, under different assumptions for feedback and foregrounds, the ongoing HERA and upcoming SKA1-low experiments will provide constraints on uncorrelated CIPs at the level of $\sigma(A_{\rm CIP})= 10^{-3}-10^{-4}$, comparable to the sensitivity of upcoming CMB experiments, and potentially exceeding the constraints from cosmic-variance limited BAO surveys.}, added-at = {2021-06-24T08:20:41.000+0200}, author = {Hotinli, Selim C. and Binnie, Thomas and Muñoz, Julian B. and Dinda, Bikash R. and Kamionkowski, Marc}, biburl = {https://www.bibsonomy.org/bibtex/2f5e34c075274298faf948951d270d6a2/gpkulkarni}, description = {Probing Compensated Isocurvature with the 21-cm Signal during Cosmic Dawn}, interhash = {eb69b0b88c837a6874a21d7ed99c8278}, intrahash = {f5e34c075274298faf948951d270d6a2}, keywords = {library}, note = {cite arxiv:2106.11979Comment: 13 pages, 5 figures, comments welcome}, timestamp = {2021-06-24T08:20:41.000+0200}, title = {Probing Compensated Isocurvature with the 21-cm Signal during Cosmic Dawn}, url = {http://arxiv.org/abs/2106.11979}, year = 2021 }