Neutrino at different epochs of the Friedmann Universe
arXiv:2404.07081 · doi:10.3390/universe10040169
Abstract
Nowadays, at least two relics of the Big Bang have survived - the cosmological microwave background (CMB) and the cosmological neutrino background (CB). Being the second most abundant particle in the Universe, the neutrino has a significant impact on its evolution from the Big Bang to the present day. Neutrinos affect the following cosmological processes: the expansion rate of the Universe, its chemical and isotopic composition, the CMB anisotropy and the formation of the large-scale structure of the Universe. Another relic neutrino background is theoretically predicted, it consists of non-equilibrium antineutrinos of Primordial Nucleosynthesis arising as a result of the decays of neutrons and tritium nuclei. Such antineutrinos are an indicator of the baryon asymmetry of the Universe. In addition to experimentally detectable active neutrinos, the existence of sterile neutrinos is theoretically predicted to generate neutrino masses and explain their oscillations. Sterile neutrinos can also solve such cosmological problems as the baryonic asymmetry of the Universe and the nature of dark matter. The recent results of several independent experiments point to the possibility of the existence of a light sterile neutrino. However, the existence of such a neutrino is inconsistent with the predictions of the Standard Cosmological Model. The inclusion of a non-zero lepton asymmetry of the Universe and/or increasing the energy density of active neutrinos can eliminate these contradictions and reconcile the possible existence of sterile neutrinos with Primordial Nucleosynthesis, the CMB anisotropy, and also reduce the H-tension. In this brief review, we discuss the influence of the physical properties of active and sterile neutrinos on the evolution of the Universe from the Big Bang to the present day.
References in corpus (15)
- Dynamics of dark energy
- A Comprehensive Measurement of the Local Value of the Hubble Constant with 1 km/s/Mpc Uncertainty from the Hubble Space Telescope and the SH0ES Team
- In the Realm of the Hubble tension a Review of Solutions
- Dark Energy and the Accelerating Universe
- Dark Matter Candidates from Particle Physics and Methods of Detection
- Massive neutrinos and cosmology
- Primordial Nucleosynthesis in the Precision Cosmology Era
- Results from the Baksan Experiment on Sterile Transitions (BEST)
- Constraining The Universal Lepton Asymmetry
- Stereo neutrino spectrum of 235U fission rejects sterile neutrino hypothesis
- A new determination of the primordial helium abundance using the analyses of HII region spectra from SDSS
- A New Precise Determination of the Primordial Abundance of Deuterium: Measurement in the metal-poor sub-DLA system at z=3.42 towards quasar J1332+0052
- Determination of HII region metallicity in the context of estimating the primordial helium abundance
- Binomial Line Cox Processes: Statistical Characterization and Applications in Wireless Network Analysis
- The influence of the effective number of active and sterile neutrinos on the determination of the values of cosmological parameters