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Results and forecasts on cosmic inflation from weak lensing

Ferté, Agnès·Hong, Kevin
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Abstract

Here, we highlight the role of weak lensing measurements from current and upcoming stage-IV imaging surveys in the search for cosmic inflation, specifically in measuring the scalar spectral index n s . To do so, we combine the Dark Energy Survey 3 years of observation weak lensing and clustering data with Bicep/Keck, Planck, and Sloan Digital Sky Survey data in r⁢Λ⁢ CDM (cold dark matter) where r is the tensor-to-scalar ratio. While there is no significant improvement in constraining power, we obtain a 1⁢σ shift on n s . Additionally, we forecast a weak lensing and clustering data vector from the 10-year Legacy Survey of Space and Time by the Vera C. Rubin Observatory and show its combination with current data would improve their n s constraints by 25% in r⁢Λ⁢ CDM.

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79 ASTRONOMY AND ASTROPHYSICScosmic microwave backgroundcosmological parametersinflationlarge scale structure of the universe

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Ferté, Agnès, Hong, Kevin. 2024-05-01. Results and forecasts on cosmic inflation from weak lensing. https://doi.org/10.1103/physrevd.109.103502

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