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CMB Spectral Distortions: Status and Prospects

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arxiv 1907.13195 v1 pith:Y72WKSGN submitted 2019-07-30 astro-ph.CO astro-ph.IM

A. Kogut , M. H. Abitbol , J. Chluba , J. Delabrouille , D. Fixsen , J. C. Hill , S. P. Patil , A. Rotti This is my paper · ORCID
classification astro-ph.COastro-ph.IM
keywords distortionssensitivitycosmichistorylimitsmodelspectraluniverse
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Departures of the energy spectrum of the cosmic microwave background (CMB) from a perfect blackbody probe a fundamental property of the universe -- its thermal history. Current upper limits, dating back some 25 years, limit such spectral distortions to 50 parts per million and provide a foundation for the Hot Big Bang model of the early universe. Modern upgrades to the 1980's-era technology behind these limits enable three orders of magnitude or greater improvement in sensitivity. The standard cosmological model provides compelling targets at this sensitivity, spanning cosmic history from the decay of primordial density perturbations to the role of baryonic feedback in structure formation. Fully utilizing this sensitivity requires concurrent improvements in our understanding of competing astrophysical foregrounds. We outline a program using proven technologies capable of detecting the minimal predicted distortions even for worst-case foreground scenarios.

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Forward citations

Cited by 4 Pith papers

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score. Full citation record

  1. Robust {\mu}-distortion constraints on primordial supermassive black holes from cubic (gNL) non-Gaussian perturbations

    astro-ph.CO 2025-05 conditional novelty 6.0 of 10

    In the infinite cubic (gNL) non-Gaussianity limit, CMB mu-distortion constraints on the primordial power spectrum amplitude remain close to Gaussian, deviating only at high wavenumbers.

  2. Gravitational Waves from Spectator Scalar Fields

    hep-ph 2025-06 conditional novelty 4.0 of 10

    Heavy spectator scalar fields with masses near the inflationary Hubble scale generate a gravitational wave background observable across pulsar timing arrays, LISA, and ground-based interferometers, with constraints re...

  3. Microwave Spectro-Polarimetry of Matter and Radiation across Space and Time

    astro-ph.CO 2019-09 unverdicted novelty 4.0 of 10

    This white paper proposes a large space mission combining a polarized imager, a filter-bank spectrometer, and absolute spectrometers to map the microwave sky from 10 to 2000 GHz and probe cosmology across cosmic time.

  4. New Horizons in Cosmology with Spectral Distortions of the Cosmic Microwave Background

    astro-ph.CO 2019-09 unverdicted novelty 3.0 of 10

    A white paper advocating for a CMB spectral distortion mission to detect predicted mu, y, and recombination signals and probe inflation, dark matter, and particle physics.

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