662 citations · 4.2k across the 84 of their papers we have counts for
87 papers
Probing the neutrino chemical potential with cosmological observations
Pietro Ghedini, Riccardo Impavido, Stefano Gariazzo +2
The electron neutrino degeneracy parameter, , is tightly constrained by Big Bang Nucleosynthesis (BBN), while the degeneracy parameters of…
Are Cosmological Data Excluding Sterile Neutrinos or Only the Fully Thermalized Limit?
Artur Ladeira, Rafael C. Nunes, Eleonora Di Valentino +1
We present a cosmological reassessment of light sterile-neutrino scenarios, examining whether current observations exclude sterile neutrinos as a class or primarily constrain the f…
Towards Low-Energy Electron High-Resolution Spectroscopy with Transition-Edge Sensors
R. Ammendola, A. Apponi, G. Benato +62
We present a study of the energy resolution of transition-edge sensors (TESs) for the detection of electrons in the 100~eV kinetic energy range. The TES is a Ti-Au bilayer with an…
Impact of non-standard neutrino-electron interactions on Big Bang Nucleosynthesis
Julien Froustey, Stefano Gariazzo, Jaume Moncho +2
Neutrino non-standard interactions (NSI) with electrons, predicted in many extended theoretical models of particle physics, are known to alter the picture of neutrino decoupling fr…
Early-universe constraints on the electron mass
Michela Garramone, Stefano Gariazzo, Nicolao Fornengo
We investigate the impact of a nonstandard electron mass on early-Universe thermal history, focusing on neutrino decoupling and Big Bang Nucleosynthesis (BBN). In the standar…
Ultra-high precision high voltage system for PTOLEMY
R. Ammendola, A. Apponi, G. Benato +63
The PTOLEMY project is prototyping a novel electromagnetic filter for high-precision spectroscopy, with the ultimate and ambitious long-term goal of detecting the cosmic neutri…
The CosmoVerse White Paper: Addressing observational tensions in cosmology with systematics and fundamental physics
Eleonora Di Valentino, Jackson Levi Said, Adam Riess +533
The standard model of cosmology has provided a good phenomenological description of a wide range of observations both at astrophysical and cosmological scales for several decades.…
Big Bang Nucleosynthesis as a probe of non-standard neutrino interactions and non-unitary three-neutrino mixing
Gabriela Barenboim, Stefano Gariazzo, Alberto Sánchez-Vargas
In this work we investigate the impact of two phenomenological Beyond the Standard Model (BSM) scenarios concerning the role of neutrinos in the early universe: non-standard neutri…
Scale and redshift dependent limits on cosmic neutrino properties
Deng Wang, Olga Mena, Eleonora Di Valentino +1
Cosmological neutrino mass and abundance measurements are reaching unprecedented precision. Testing their stability versus redshift and scale is a crucial issue, as it can serve as…
A Demonstration of Slowed Electron Drift for PTOLEMY
M. Farino, A. Tan, A. Apponi +58
To resolve the effective neutrino mass with an energy resolution of 50~meV, the PTOLEMY experiment has proposed a novel transverse electromagnetic filtering process. Substant…
Current constraints on cosmological scenarios with very low reheating temperatures
Nicola Barbieri, Thejs Brinckmann, Stefano Gariazzo +3
We present a comprehensive analysis of the effects of models with very low reheating scenarios () on the cosmological observables and deri…
Neutrino cosmology after DESI: tightest mass upper limits, preference for the normal ordering, and tension with terrestrial observations
Jun-Qian Jiang, William Giarè, Stefano Gariazzo +6
The recent DESI Baryon Acoustic Oscillation measurements have led to tight upper limits on the neutrino mass sum, potentially in tension with oscillation constraints requiring $\su…
Updating neutrino mass constraints with Background measurements
Deng Wang, Olga Mena, Eleonora Di Valentino +1
Low-redshift probes, such as Baryon Acoustic Oscillations (BAO) and Supernovae Ia luminosity distances, have been shown to be crucial for improving the bounds on the total neutrino…
Neutrinos in Cosmology
Eleonora Di Valentino, Stefano Gariazzo, Olga Mena
Neutrinos are the least known particle in the Standard Model of elementary particle physics. They play a crucial role in cosmology, governing the universe's evolution and shaping t…
How robust are the parameter constraints extending the CDM model?
Stefano Gariazzo, William Giarè, Olga Mena +1
We present model-marginalized limits on the six standard CDM cosmological parameters (, , , , and ), as well a…
Neutrino masses in cosmology
S. Gariazzo
We review the status of neutrino mass constraints obtained from cosmological observations, with a particular focus on the results derived considering Cosmic Microwave Background (C…
Non-standard cosmic expansion histories: Neutrino decoupling and primordial nucleosynthesis signatures
D. Aristizabal Sierra, S. Gariazzo, A. Villanueva
Cosmological scenarios with a non-standard equation of state can involve ultrastiff fluids, understood as primordial fluids for which . Their energy densities can dominate…
On the dark radiation role in the Hubble constant tension
Stefano Gariazzo, Olga Mena
Dark radiation, parameterized in terms of , has been considered many times in the literature as a possible remedy in alleviating the Hubble constant () tension. W…
Impact of the damping tail on neutrino mass constraints
Eleonora Di Valentino, Stefano Gariazzo, William Giarè +1
Model-independent mass limits assess the robustness of current cosmological measurements of the neutrino mass scale. Consistency between high-multipole and low-multiple Cosmic Micr…
Quantifying the tension between cosmological and terrestrial constraints on neutrino masses
Stefano Gariazzo, Olga Mena, Thomas Schwetz
The sensitivity of cosmology to the total neutrino mass scale is approaching the minimal values required by oscillation data. We study quantitatively possible tensions betwe…
A novel model-marginalized cosmological bound on the QCD axion mass
Eleonora Di Valentino, Stefano Gariazzo, William Giarè +3
We present model-marginalized limits on mixed hot dark matter scenarios, which consider both thermal neutrinos and thermal QCD axions. A novel aspect of our analyses is the inclusi…
Non-unitary three-neutrino mixing in the early Universe
Stefano Gariazzo, Pablo Martínez-Miravé, Olga Mena +2
Deviations from unitarity in the three-neutrino mixing canonical picture are expected in many physics scenarios beyond the Standard Model. The mixing of new heavy neutral leptons w…
Model marginalized constraints on neutrino properties from cosmology
Eleonora di Valentino, Stefano Gariazzo, Olga Mena
We present robust, model-marginalized limits on both the total neutrino mass () and abundance () to minimize the role of parameterizations, priors and models…
Neutrino mass and mass ordering: No conclusive evidence for normal ordering
Stefano Gariazzo, Martina Gerbino, Thejs Brinckmann +8
The extraction of the neutrino mass ordering is one of the major challenges in particle physics and cosmology, not only for its implications for a fundamental theory of mass genera…