Publication

New PAU Paper

“The PAU Survey: Photometric redshifts using transfer learning from simulations” by M. Eriksen et al. has been uploaded to arXiv.

It is the first paper demonstrating we can constrain PAUS redshifts with deep learning techniques. Previously we had (Eriksen 2019) shown it worked with template fitting method. Using a deep neural network we managed to improvethe photo-z scatter with 50% for the faintest galaxies. This was possible througha set of different techniques introduced in the paper. Among the most important was combining simulated and observed data when training the neural network.We also included techniques like auto-encoders to extract information about the galaxy SEDs.

Link to arXiv

Latest Group News

New results

Andreu Font Presents Latest DESI BAO Results at Harvard

May 5, 2025

During the week of April 15, 2025, Andreu Font delivered a talk at Harvard’s Center for Astrophysics, presenting the latest Baryon Acoustic Oscillation (BAO) results from the Dark Energy Spectroscopic Instrument (DESI) collaboration. His presentation, titled “How Constant is the Cosmological Constant? Challenging the ΛCDM Model with New Measurements from the DESI Collaboration ”, explored how recent data may question key assumptions of the standard cosmological model.

The talk is available to watch online .

New Member

New member in the Cosmology Group

April 2, 2025

Tyann Dumerchat joined the Observational Cosmology group as a postdoctoral researcher

Instrumentation

Vera C. Rubin Observatory Installs LSST Camera on Telescope

March 13, 2025

The Vera C. Rubin Observatory has reached a major milestone with the successful installation of the LSST Camera on its telescope.