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2023

CMB constraints on the early universe independent of late time cosmology

Lemos, Pablo, Lewis, Antony

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The CMB is a powerful probe of early-universe physics but is only observed after passing through large-scale structure, which changes the observed spectra in important model-dependent ways.

This is of particular concern given recent claims of significant discrepancies with low redshift data sets when a standard $\Lambda$CDM model is assumed.
By using empirical measurements of the CMB lensing reconstruction, combined with weak priors on the smoothness of the lensing spectrum, foregrounds, and shape of any additional integrated Sachs-Wolfe effect, we show how the early-universe parameters can be constrained from CMB observations almost independently of the late-time evolution.
This provides a way to test new models for early-universe physics, and measure early-universe parameters, independently of late-time cosmology.

CMB constraints on the early universe independent of late time cosmology · Around

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