Conveners
Unveiling neutrino secrets through cosmology: current status and future developments: Tuesday block 2
- Nicola Barbieri (University of Ferrara)
- Massimiliano Lattanzi (INFN Ferrara)
- Luca Caloni (University of Ferrara)
Description
In the past few years, precision cosmology has emerged as a powerful tool to investigate neutrino properties and interactions, providing complementary information to laboratory experiments with unprecedented sensitivity. From the impact on the abundance of primordial elements to the signatures left on the anisotropies of the Cosmic Microwave Background and the subsequent clustering dynamics, neutrinos exert a diverse range of effects on cosmological observables thanks to their rich phenomenology.
Several fundamental questions are still left without an answer, including the origin and hierarchy of neutrino masses, their Dirac or Majorana nature, and the presence of additional neutrino species. This session will explore all these fundamental aspects of neutrino physics, by exploiting the interplay between cosmological observations and laboratory experiments. We will outline current constraints, discuss future prospects, and explore novel techniques to deepen our knowledge of neutrino properties.
Cosmic neutrinos are a subdominant part of the cosmological dark matter whose main cosmological effect is to suppress the small-scale clustering. This has enabled an upper limit on the sum of their masses to be placed from astronomical data, with at most 2\% of the dark matter composed of neutrinos at 95\% confidence, or $\Sigma m_{\nu} < 0.12 ~\rm{eV}$. This bound assumes that the...
The existence of a relic neutrino backgorund (R$\nu$B) is a major prediction of the standard cosmological model, but its detection is one of the hardest tasks in neutrino physics. The main challenge arises because of its extremely low energy, as a consequence of its low temperature $T_\nu \simeq 1.67\times 10^{-4}\,\text{eV}$. The most promising experimental technique to detect the R$\nu$B is...
We investigate the quantum speed limit (QSL) during the time evolution of neutrinos and antineutrinos under the influence of a gravitational field. We derive an analytical expression for the four-vector gravitational potential in the underlying Hermitian Dirac Hamiltonian using the Boyer-Lindquist coordinates. This gravitational potential leads to an axial vector in the Dirac equation in...
CMB lensing provides a powerful way to measure the mass of the neutrinos. Traditional analyses of CMB lensing can suffer from biases in neutrino mass constraints if the wrong dark energy model or parametrization is assumed. In this talk, I will present a method to remove low-redshift contributions from CMB lensing mass maps, enhancing their sensitivity to high-redshift structures and becoming...
