Year: 2024
Type: article
Abstract: 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 $r\mathrm{\ensuremath{\Lambda}}\mathrm{CDM}$ (cold dark matter) where $r$ is the tensor-to-scalar ratio. While there is no significant improvement in constraining power, we obtain a $1\ensuremath{\sigma}$ 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 $r\mathrm{\ensuremath{\Lambda}}\mathrm{CDM}$.
Authors: Agnès Ferté, Kevin Hong
Institution: SLAC National Accelerator Laboratory
Language: English
Subfield: Astronomy and Astrophysics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: green
OpenAlex ID: W4396568415