Anticipating a new physics signal in upcoming 21-cm power spectrum observations

Barkana, Rennan; Fialkov, Anastasia; Liu, Hongwan; Outmezguine, Nadav Joseph

doi:10.1103/physrevd.108.063503

Title: Anticipating a new physics signal in upcoming 21-cm power spectrum observations

Journal Article · 07 September 2023 · Physical Review. D.

DOI: https://doi.org/10.1103/physrevd.108.063503 · OSTI ID:1998823

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Tel-Aviv University (Israel); Institute for Advanced Study, Princeton, NJ (United States); University of California, Santa Cruz, CA (United States)
University of Cambridge (United Kingdom); Kavli Institute for Cosmology Cambridge (United Kingdom)
New York University (NYU), NY (United States); Princeton University, NJ (United States)
University of California, Berkeley, CA (United States); Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)

Dark matter–baryon interactions can cool the baryonic fluid, which has been shown to modify the cosmological 21-cm global signal. We show that in a two-component dark sector with an interacting millicharged component, dark matter–baryon scattering can produce a 21-cm power spectrum signal with acoustic oscillations. The signal can be up to 3 orders of magnitude larger than expected in Λ CDM cosmology, given realistic astrophysical models. In conclusion, this model provides a new-physics target for near-future experiments such as HERA or NenuFAR, which can potentially discover or strongly constrain the dark matter explanation of the putative EDGES anomaly.

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Research Organization:: Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States); Princeton Univ., NJ (United States)

Sponsoring Organization:: USDOE Office of Science (SC), High Energy Physics (HEP); National Science Foundation (NSF); Israel Science Foundation (ISF)

Grant/Contract Number:: AC02-05CH11231; SC0007968; 2359/20; PHY-2210498; PHY-1915314; PHY-1607611; DESC0007968

OSTI ID:: 1998823

Alternate ID(s):: OSTI ID: 2283939

Journal Information:: Physical Review. D., Vol. 108, Issue 6; ISSN 2470-0010

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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