We released a major new version of CHIMERA, the hierarchical Bayesian pipeline for standard siren cosmology. Version 2 brings substantial computational and methodological improvements: a full rewrite using JAX delivers 10–1000× speedup with GPU acceleration, making it feasible to process the tens of thousands of events expected from next-generation detectors such as the Einstein Telescope within a manageable timeframe. On the methodology side, the new version introduces a principled treatment of galaxy catalog incompleteness, more versatile compact binary mass function models, and the ability to infer the luminosity distance–redshift relation under modified gravitational-wave propagation, a key test of extensions to general relativity. These advances are presented in a series of companion papers (arXiv:2602.17756, arXiv:2509.18243, arXiv:2601.03347, arXiv:2504.02034).

The PRIN2022 project "Optimizing the extraction of cosmological information from Large Scale Structure analysis in view of the next large spectroscopic surveys" has been successfully completed. The project delivered a comprehensive end-to-end pipeline for the joint full-shape analysis of 2PCF and 3PCF, including realistic forward modelling of survey systematics, fast emulators for higher-order statistics, and the first joint 2PCF+3PCF cosmological constraints on both Euclid simulations and BOSS DR12 data. See all project results →

We joined as a beneficiary node the ERC Synergy Grant RedH0T, focused on understanding the Hubble tension through several complementary observational approaches. We are participating with our expertise on the use of age as a cosmological tracer, through the cosmic chronometers and cosmic clocks methods, to provide independent measurements of the expansion history of the Universe. Read the announcement →

I was invited to contribute two review chapters on cosmic chronometers: "Measuring the expansion history of the Universe with cosmic chronometers" for the Encyclopedia of Astrophysics (Elsevier Reference Module, eds. I. Mandel & C. Howlett), and "Addressing the Hubble tension with cosmic chronometers", an invited chapter for the edited book Hubble Constant Tension (eds. E. Di Valentino & D. Brout, Springer Singapore).

We release CHIMERA, a new python code based on Hierarchical Bayesian Inference to study GWs as standard sirens, deriving joint constraints on cosmological and gravitational-wave population parameters, combining the "dark sirens" and "spectral sirens" methods. We find that with this new approach, it will be possible to reach the percent-level accuracy on H₀ with just 100 BBH events in LVK O5 data and a spectroscopic catalog. Read the paper →

I was awarded a 2-year Italian grant (PRIN2022, "Optimizing the extraction of cosmological information from Large Scale Structure analysis in view of the next large spectroscopic surveys") to develop new methods to best exploit spectroscopic galaxy redshift surveys, with particular attention on systematic errors and the constraining power of combined 2- and 3-point correlation functions at the BAO scale. This research activity is carried out in collaboration with Dr. Benjamin Granett (INAF-Brera) and prof. Robert Benton Metcalf (University of Bologna).

"Unveiling the Universe with Emerging Cosmological Probes" published in Living Reviews in Relativity. A state-of-the-art benchmark on beyond-standard cosmological probes: cosmic chronometers, quasars, gamma-ray bursts, standard sirens, lensing time-delay, cosmic voids, neutral hydrogen intensity mapping, surface brightness fluctuations, secular redshift drift, and clustering of standard candles.