The Distance Network provides a unified, statistically rigorous framework for a robust combined statistical analysis of a broad variety of local measurements of the Hubble constant. This approach provides full error propagation, accounting for commonalities between measurements, and statistical tests to identify possible outliers. We obtain an improved determination of the Hubble constant,...
Convergence in the value of H0 from Type Ia Supernovae
In this talk, I will review new findings that point towards a
concordant value of the Hubble constant (H0) from data based in
the SH0ES collaboration and the Chicago--Carnegie Supernova Project
using the ''SNe Ia twins method'' and using, as well, the common
''SNe Ia light curve method''.
There has been usually a discrepancy...
Recent results from the Dark Energy Spectroscopic Instrument has shifted our understanding about dark energy, preferring about 2-3 sigma evidence for evolving dark energy. The phantom crossing of the dark energy equation of state has motivated the search of new cosmological models. In this talk, I will discuss how combinations of data from Rubin Observatory LSST, Simons Observatory and SKAO...
We apply Simulation-Based Inference ('SBI') to the cosmic dipole problem for the first time, measuring the distribution of quasar counts over the sky in the infrared CatWISE2020 sample. Our SBI-based approach alleviates systematic effects arising from the WISE instrument itself and enables direct inference of the sample's dipole. We find a dipole that is twice as large as the CMB expectation...
The cosmic dipole observed in the matter distribution of galaxy surveys consistently disagrees with the kinematic expectation set by the cosmic microwave background, posing a serious challenge to the Cosmological Principle and the standard model of cosmology. However, the fidelity of the dipoles we infer rests on our understanding of the systematics present in the surveys. For many...
Recent observations have revealed the presence of cosmic structures at even very large scales in the Universe. This, along with cosmological tensions, motivates re-examination of the standard paradigm of the concordance model based on assumptions of homogeneous matter distribution at various cosmological scales. The observed large-scale matter inhomogeneities may possibly impact the background...
