Renormalizing the vacuum energy in cosmological spacetime: implications for the cosmological constant problem
The renormalization of the vacuum energy in quantum field theory (QFT) is usually plagued
with theoretical conundrums related not only with the renormalization procedure itself, but …
with theoretical conundrums related not only with the renormalization procedure itself, but …
Testing -free cosmology
We study a model of symmetric teleparallel gravity that is able to account for the current
accelerated expansion of the Universe without the need for a dark energy component. We …
accelerated expansion of the Universe without the need for a dark energy component. We …
A short review on clustering dark energy
We review dark energy models that can present non-negligible fluctuations on scales
smaller than Hubble radius. Both linear and nonlinear evolutions of dark energy fluctuations …
smaller than Hubble radius. Both linear and nonlinear evolutions of dark energy fluctuations …
Galaxy number-count dipole and superhorizon fluctuations
In view of the growing tension between the dipole anisotropy of number counts of
cosmologically distant sources and of the cosmic microwave background (CMB), we …
cosmologically distant sources and of the cosmic microwave background (CMB), we …
Multi-interacting dark energy and its cosmological implications
In the effort to define the main features a successful solution to the Hubble tension should
have, growing evidence has emerged pointing to the need for models able to modify the …
have, growing evidence has emerged pointing to the need for models able to modify the …
Joint reconstructions of growth and expansion histories from stage-IV surveys with minimal assumptions. II. Modified gravity and massive neutrinos
Based on a formalism introduced in our previous work, we reconstruct the
phenomenological function G eff (z) describing deviations from general relativity (GR) in a …
phenomenological function G eff (z) describing deviations from general relativity (GR) in a …
Minimal theory of massive gravity in the light of CMB data and the tension
We investigate the minimal theory of massive gravity (MTMG) in the light of different
observational datasets that are in tension within the Λ cold dark matter cosmology. In …
observational datasets that are in tension within the Λ cold dark matter cosmology. In …
Inferring and with cosmic growth rate measurements using machine learning
Measurements of the cosmological parameter S 8 provided by cosmic microwave
background and large scale structure data reveal some tension between them, suggesting …
background and large scale structure data reveal some tension between them, suggesting …
Constraining gravity with synergies between radio and optical cosmological surveys
In this work we present updated forecasts on parameterised modifications of gravity that can
capture deviations of the behaviour of cosmological density perturbations beyond Λ CDM …
capture deviations of the behaviour of cosmological density perturbations beyond Λ CDM …
The Heisenberg limit at cosmological scales
For an observation time equal to the universe age, the Heisenberg principle fixes the value
of the smallest measurable mass at m H= 1.35× 10-69 kg and prevents to probe the …
of the smallest measurable mass at m H= 1.35× 10-69 kg and prevents to probe the …