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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

classification astro-ph.COastro-ph.IM
keywords distortionssensitivitycosmichistorylimitsmodelspectraluniverse
verification ladder T0 review T1 audit T2 compute T3 formal
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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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Cited by 4 Pith papers

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