Effective bias expansion for 21-cm cosmology in redshift space

Qin, Wenzer; Schutz, Katelin; Smith, Aaron; Garaldi, Enrico; Kannan, Rahul; Slatyer, Tracy R.; Vogelsberger, Mark

doi:10.1103/physrevd.106.123506

Effective bias expansion for 21-cm cosmology in redshift space

Journal Article · Mon Dec 12 23:00:00 EST 2022 · Physical Review. D.

DOI:https://doi.org/10.1103/physrevd.106.123506· OSTI ID:1909588

^[1]; ^[2]; ^[3]; ^[4]; ^[5]; Slatyer, Tracy R. ^[6]; ^[6]

Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States); Massachusetts Institute of Technology (MIT), Cambridge, MA (United States)
Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States); McGill Univ., Montreal, QC (Canada)
Harvard & Smithsonian, Cambridge, MA (United States); Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)
Max-Planck Inst. for Astrophysics, Garching (Germany)
Harvard & Smithsonian, Cambridge, MA (United States)
Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)

A near-future detection of the 21-cm signal from the epoch of reionization will provide unique opportunities to probe the underlying cosmology, provided that such cosmological information can be extracted with precision. To this end, we further develop effective field theory (EFT) inspired techniques for the 21-cm brightness temperature field during the epoch of reionization, incorporating renormalized bias and a treatment of redshift space distortions. Notably, we confirm that in redshift space, measures of the 21-cm brightness, e.g., the power spectrum, should have irreducible contributions that lack a bias coefficient and therefore contain direct, astrophysics-free information about the cosmological density field; in this work, we study this effect beyond linear order. To validate our theoretical treatment, we fit the predicted EFT Fourier-space shapes to the thesan suite of hydrodynamical simulations of reionization at the field level, where the considerable number of modes prevents overfitting. We find agreement at the level of a few percent between the 21-cm power spectrum from the EFT fits and simulations over the wave number range k ≲ 0.8 h/Mpc and neutral fraction x_HI ≳ 0.4, which is imminently measurable by the Hydrogen Epoch of Reionization Array and future experiments. Furthermore, the ability of the EFT to describe the 21-cm signal extends to simulations that have different astrophysical prescriptions for reionization as well as simulations with interacting dark matter.

View Accepted Manuscript (DOE)

Research Organization:: Massachusetts Institute of Technology (MIT), Cambridge, MA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), High Energy Physics (HEP); National Science Foundation Graduate Research Fellowship

Grant/Contract Number:: SC0012567

OSTI ID:: 1909588

Journal Information:: Physical Review. D., Journal Name: Physical Review. D. Journal Issue: 12 Vol. 106; ISSN 2470-0010

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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