Using the cosmological recombination radiation to probe early dark energy and fundamental constant variations

Abstract

The cosmological recombination radiation (CRR) is one of the guaranteed spectral distortion signals from the early Universe. The CRR photons from hydrogen and helium pre-date the last scattering process and as such allow probing physical phenomena in the pre-recombination era. Here we compute the modifications to the CRR caused by early dark energy models and varying fundamental constants. These new physics examples have seen increased recent activity in connection with the Hubble tension, motivating the exploratory study presented here. The associated CRR responses are spectrally-rich but the level of the signals is small. We forecast the possible sensitivity of future spectrometers to these effects. Our estimates demonstrate that the CRR directly depends to changes in the expansion history and recombination physics during the pre-recombination era. However, futuristic sensitivities are required for spectrometer-only constraints that are competitive with other cosmological probes. Nevertheless, measurements of the CRR can directly reach into phases that otherwise remain inaccessible, highlighting the potential these types of observations could have as a probe of the early Universe. A combination with $Planck$ data further shows that a synergistic approach is very promising.

17 pages, 25 figures, 4 tables; submitted to MNRAS

References in corpus (32)

• Large Magellanic Cloud Cepheid Standards Provide a 1% Foundation for the Determination of the Hubble Constant and Stronger Evidence for Physics Beyond LambdaCDM
• Challenges for $\Lambda$CDM: An update
• Cosmic Distances Calibrated to 1% Precision with Gaia EDR3 Parallaxes and Hubble Space Telescope Photometry of 75 Milky Way Cepheids Confirm Tension with LambdaCDM
• The trouble with $H_0$
• Cosmology Intertwined II: The Hubble Constant Tension
• The $H_0$ Olympics: A fair ranking of proposed models
• Early dark energy, the Hubble-parameter tension, and the string axiverse
• Early dark energy is not excluded by current large-scale structure data
• The status of varying constants: a review of the physics, searches and implications
• Neutrino cosmology and Planck
• Revealing Intrinsic Flat $\Lambda$CDM Biases with Standardizable Candles
• Lines in the Cosmic Microwave Background Spectrum from the Epoch of Cosmological Hydrogen Recombination
• Lines in the cosmic microwave background spectrum from the epoch of cosmological helium recombination
• Comparing early dark energy and extra radiation solutions to the Hubble tension with BBN
• Primordial helium recombination I: feedback, line transfer, and continuum opacity
• High-precision limit on variation in the fine-structure constant from a single quasar absorption system
• The Early Dark Sector, the Hubble Tension, and the Swampland
• Rapid HeII->HeI recombination and radiation concerned with this process
• Search for a Variation of the Fine Structure around the Supermassive Black Hole in Our Galactic Center
• Subaru Telescope limits on cosmological variations in the fine-structure constant
• Tests of the CMB temperature-redshift relation, CMB spectral distortions and why adiabatic photon production is hard
• Prospects for Constraining Neutrino Mass Using Planck and Lyman-Alpha Forest Data
• Is there a need and another way to measure the Cosmic Microwave Background temperature more accurately?
• Constraining Variations in the Fine Structure Constant in the presence of Early Dark Energy
• Varying fundamental constants principal component analysis: additional hints about the Hubble tension
• Testing dark energy after pre-recombination early dark energy
• Measuring the fine structure constant on a white dwarf surface; a detailed analysis of Fe V absorption in G191-B2B
• Sensitivity forecasts for the cosmological recombination radiation in the presence of foregrounds
• The role of CMB spectral distortions in the Hubble tension: a proof of principle
• Testing the weak equivalence principle by differential measurements of fundamental constants in the Magellanic Clouds
• Early Dark Energy from a Higher-dimensional Gauge Theory
• Constraints on the electron-to-proton mass ratio variation at the epoch of reionization

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