Beyond ΛCDM constraints
Probing new physics with cosmology.
Using my multiprobe framework, I have explored dynamical dark energy models and compared early versus late-time dark energy as potential resolutions to cosmological tensions. Earlier work examined Early Dark Energy models with free neutrino mass in light of the Hubble tension. I also contributed to a white paper on cosmological tensions.
Recent highlights
Testing extended cosmological models: Comparison of constraints from BAO+LSS data (blue/green) versus CMB data (black) in ΛCDM, early dark energy (EDE) and dynamical dark energy (DDE). The consistent addition of multiprobe LSS data heightens the tension in ΛCDM and leads to a mild preference for these extended models which can help to reconcile this. From Reeves et al. (2025b).
Future work will incorporate Gaussian Process reconstructions of expansion and growth histories, enabling direct, non-parametric tests of modified gravity by comparing independently reconstructed H(z) and D(z) evolution.