The Effect of Neutrino Mass in Cosmology

Нагирнер, Д. И.; Turichina, D. G.

doi:10.1007/s10511-019-09568-5

Cited by 2 publications

(2 citation statements)

References 8 publications

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“…Of course, at high temperatures the matter was relativistic, but then its abundance was small. Similarly, due to the finiteness of the mass, at low temperatures neutrinos transformed from ultrarelativistic to relativistic (moderately or weakly) or even non-relativistic, but by then their mass fraction was small and difference of their masses from zero do not affect evolution of the universe [32]. Therefore, we assume that during the entire evolution of the universe over the period under consideration, the matter has not exerted pressure.…”

Section: Non-interacting Componentsmentioning

confidence: 99%

The Standard Cosmological Model: Basic Geometric and Kinematic Features

Нагирнер¹,

Jorstad²

2019

Preprint

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We present a brief history of the construction of models of the universe, followed by calculations of quantitative characteristics of basic geometric and kinematic properties of the Standard Cosmological Model ($\Lambda$CDM). Using the Friedmann equations of uniform space, we derive equations characterizing a $\Lambda$CDM model that describes a universe corresponding to current observational data. The equations take into account the effects of radiation and ultra-relativistic neutrinos. It is shown that the universe at very early and late stages can be described to sufficient accuracy by simple formulas. Certain important moments of cosmic evolution are determined: the times when densities of the gravitational components of the universe become equal, when they contribute equally to the gravitational force, when the accelerating expansion of space begins, and several others. The dependences of different distances on redshift and the scale factor of space are derived. The distance to the sphere that expands with the speed of light (the Hubble distance), and its current and future acceleration, are found. Concepts of a horizon, second inflation, and second horizon are discussed. We consider the remote future of the universe and the opportunity, in principle, of connection with extraterrestrial civilizations.

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Section: Non-interacting Componentsmentioning

confidence: 99%

The Standard Cosmological Model: Basic Geometric and Kinematic Features

Нагирнер¹,

Jorstad²

2019

Preprint

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“…Besides these fundamental high-energy physics issues, neutrinos are also important in other areas, such as e.g. cosmology, where the mass of the neutrinos could have an effect on the expansion of our universe [2]. Of particular note is the role that neutrinos play in the realm of astrophysics.…”

Section: Introductionmentioning

confidence: 99%

Lepton kinematics in low-energy neutrino-argon interactions

2020

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Background: Neutrinos in the low-energy regime provide a gateway to a wealth of interesting physics. While plenty of literature exists on detailing the calculation and measurement of total reaction strengths, relatively little attention is paid to the measurement and modeling of the final lepton through differential cross sections at low energies, despite the experimental importance.Purpose: We calculate differential cross sections for low-energy neutrino-nucleus scattering. We examine the role played by forbidden transitions in these distributions and how this differs across different energies and nuclear target masses. Attention is also paid to predictions for typical experimental neutrino spectra.Method: The differential cross sections are calculated within a Continuum Random Phase Approximation framework, which allows us to include collective excitations induced by long-range correlations. The Coulomb interaction of the final lepton in charged current events is treated in an effective way.Results: Kinematic distributions are calculated for 16 O, 40 Ar and 208 Pb. 40 Ar model results are compared for CC (νe, e − ) reactions to events generated by the MARLEY event generator [1], with noticeable discrepancies.Conclusion: Forbidden transitions have a marked effect on the kinematic distributions of the final lepton at low-energy kinematics, such as for DAR neutrinos or for a Fermi-Dirac spectrum at low temperature. This could introduce biases in experimental analyses. Backwards scattering is noticeably more prominent than with MARLEY.

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The Effect of Neutrino Mass in Cosmology

Cited by 2 publications

References 8 publications

The Standard Cosmological Model: Basic Geometric and Kinematic Features

The Standard Cosmological Model: Basic Geometric and Kinematic Features

Lepton kinematics in low-energy neutrino-argon interactions

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