Oral comunication
C. J. A. P. Martins
Abstract
The redshift drift is a unique real-time and model-independent mapping of the expansion history of the universe, directly
testing the theoretical cornerstones of the canonical LambdaCDM paradigm and enabling unique synergies with traditional
cosmological observables, e.g. for probing the nature of dark energy. Current upper limits, based on archival data, have an
uncertainty that is three orders of magnitude above the expected signal and are systematics-limited. The first dedicated
redshift drift experiment is presently ongoing, using the ESPRESSO spectrograph at the VLT. While we will not detect the
drift signal, we will obtain the first statistics-limited constraint, significantly improve current bounds, and provide a full
end-to-end proof of concept for the future detection at the ELT. I will report on the status of the experiment and discuss its
implications for the ANDES spectrograph, currently in its Phase B of construction.
18th Iberian Cosmology Meeting (IberiCOS2024)
Salamanca, Spain
2024 March
