Author

R. de Belsunce

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Review Oct 2026

Improving cosmological distance measurements at high redshift using Lyman-Alpha forest BAO reconstruction

The Dark Energy Spectroscopic Instrument (DESI) measures baryon acoustic oscillations (BAO) in the Lyman-$\alpha$ (Lyman-alpha) forest and provides a robust probe of the expansion history in the matter-dominated era. Yet, non-linear structure formation broadens and shifts the BAO peak. To undo these effects, we extend...

B. Hadzhiyska, R. de Belsunce · 0 citations

Preprint Sep 2026

$w_0w_a$ or $bc$: DESI constraints on relative baryon-CDM perturbations

We carry out a search for the relative baryon-cold dark matter (CDM) density and velocity modes in the DESI full-shape (FS) data, and investigate whether DESI's preference for evolving dark energy can be affected by these relative perturbations, which are a known contaminant of the baryon acoustic oscillations. For the...

Ananda F. Smith, Mikhail M. Ivanov, R. de Belsunce et al. · 0 citations