Despite the remarkable success of the Λ Cold Dark Matter (Λ CDM) cosmological model, a
growing discrepancy has emerged (currently measured at the level of∼ 4− 6 σ) between the …

It is commonly assumed that the energy density of the Universe was dominated by radiation
between reheating after inflation and the onset of matter domination 54,000 years later …

New physics in the neutrino sector might be necessary to address anomalies between
different neutrino oscillation experiments. Intriguingly, it also offers a possible solution to the …

Many attempts to solve the Hubble tension with extended cosmological models combine an
enhanced relic radiation density, acting at the level of background cosmology, with new …

Anti-de Sitter (AdS) vacua, being theoretically important, might have an unexpected impact
on the observable Universe. We find that in early dark energy (EDE) scenarios the existence …

The majoron, a pseudo-Goldstone boson arising from the spontaneous breaking of global
lepton number, is a generic feature of many models intended to explain the origin of the …

The disagreement between direct late-time measurements of the Hubble constant from the
SH0ES collaboration, and early-universe measurements based on the ΛCDM model from …

We perform a comprehensive study of cosmological constraints on nonstandard neutrino
self-interactions using cosmic microwave background and baryon acoustic oscillation data …

We have updated the constraints on flavour universal neutrino self-interactions mediated by
a heavy scalar, in the effective 4-fermion interaction limit. We use the relaxation time …

The cosmic microwave background (CMB) has proven to be an invaluable tool for studying
the properties and interactions of neutrinos, providing insight not only into the sum of …