Cosmological collider signatures of Higgs-R2 inflation

Ema, Yohei; Verner, Sarunas

doi:10.1088/1475-7516/2024/04/039

Title: Cosmological collider signatures of Higgs-R² inflation

Journal Article · 10 April 2024 · Journal of Cosmology and Astroparticle Physics

DOI: https://doi.org/10.1088/1475-7516/2024/04/039 · OSTI ID:2479309

^[1];

^[2]

University of Minnesota, Minneapolis, MN (United States)
University of Florida, Gainesville, FL (United States)

We study the cosmological collider signatures in the Higgs-R² inflation model. We consider two distinct types of signals: one originating from the inflaton coupling to Standard Model fermions and gauge bosons, and another arising from the isocurvature mode interaction with the inflaton. In the former case, we determine that the signal magnitude is likely too small for detection by upcoming probes, primarily due to suppression by both the Planck scale and slow-roll parameters. However, we provide a detailed computation of the signal which could be potentially applicable to various Higgs inflation variants. For the isocurvature mode signals, we observe that the associated couplings remain unsuppressed when the isocurvature mode is relatively light or comparable to the inflationary scale. In this case, we study the Higgs-R² inflation parameter space that corresponds to the quasi-single-field inflation regime and find that the signal strength could be as large as |f_NL| > 1, making Higgs-R² inflation a viable candidate for observation by future 21-cm surveys.

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Research Organization:: University of Minnesota, Minneapolis, MN (United States)

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

Grant/Contract Number:: SC0011842; SC0022148

OSTI ID:: 2479309

Journal Information:: Journal of Cosmology and Astroparticle Physics, Journal Name: Journal of Cosmology and Astroparticle Physics Journal Issue: 04 Vol. 2024; ISSN 1475-7516

Publisher:: Institute of Physics (IOP)Copyright Statement

Country of Publication:: United States

Language:: English

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Title: Cosmological collider signatures of Higgs-R2 inflation

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Title: Cosmological collider signatures of Higgs-R² inflation