arXiv subjects

V. V. Khruschov

Publications and source records attributed to V. V. Khruschov.

At least 19 recordsLinked to original sources

arXiv2025

On phenomenological relations for masses and mixing parameters of quarks and leptons

A comparative analysis of a number of phenomenological relationships between constants of the extended Standard Model of electromagnetic, strong and weak interactions of fundamental particles (hereinafter referred to as the extended Standard Model) is carried out to detect possible correlations between constants in the quark and lepton sectors. The presence of such correlations may indicate connections between constants within a more general theory than the extended Standard Model. Phenomenological relationships between masses of current and constituent quarks and mixing angles are considered. A phenomenological relationship between neutrino masses and neutrino mixing angle is found. The quark-lepton complementarity relationship for quark and neutrino mixing angles is confirmed. A typical estimate of the accuracy of such relationships is given. Estimates of the masses of sterile (right-handed) neutrinos are obtained at the phenomenological level using the seesaw mechanism. In this case, it is assumed that the values of the active neutrino masses depend on three characteristic scales, and the sum of the active neutrino masses is limited from above by $0.06$~eV. An example of a grand unification theory and possible stages of spontaneous breaking of its gauge symmetry to the level of gauge symmetry of the extended Standard Model due to additional Higgs particles are considered.

hep-ph↗

arXiv2025

The fine structure constant: a review of measurement results and possible space-time variations

A brief description of the main methods for determining the fine structure constant is given. It is shown that the exact value of the fine structure constant is important for the new International System of Units (SI) and for fundamental metrology. Recent measurement results and theoretical calculations of the fine structure constant, as well as its possible space-time variations, are presented. The results of laboratory experiments on the search for long-term variations of the fine structure constant are described. The astrophysical and cosmological observational data on possible variability of the fine structure constant are displayed. The possibility of slightly lower values of the fine structure constant in the remote past as compared to its modern value, as well as the existence of unresolved problems related to possible space-time variations of the fine structure constant and the spread of the results of its precise laboratory measurements, are mentioned. Despite the absence of experimentally confirmed long-term variations of the fine structure constant at a high level of accuracy, possible practical applications of the results are noted, namely, the construction of an optical frequency standard with high stability and frequency reproduction accuracy based on the ytterbium-171 ion and a laser frequency synthesizer which may replace the caesium frequency standard.

hep-ph↗

arXiv2025

Estimates of the masses of heavy right-handed neutrino particles using the seesaw mechanism

The mass estimates of active and sterile (right-handed) neutrinos are considered at the phenomenological level using the seesaw mechanism. It is assumed that the neutrino mass values depend on three characteristic scales, and the sum of the active neutrino mass values is limited from above by 0.06 eV. The neutrino mass values are estimated, as well as the observable neutrino mass values, namely, the average mass m_C of active neutrinos and the kinematic neutrino mass m_β of beta-decay.

hep-ph↗

arXiv2024

Some scales in neutrino physics

The problem of an active neutrinos mass origin is considered at the phenomenological level. At first an assumption is made that neutrino mass values depend on two contributions with their characteristic scales, a next assumption consists in their dependence on three dominant scales. The neutrino mass values as well as the values of neutrino mass observables $m_C$ and $m_β$ are estimated.

hep-ph↗

arXiv2024

Active and sterile neutrino oscillations inside the Sun in a phenomenological (3+1+2)-model

The phenomenological model with three active and three light sterile neutrinos is considered taking into account terrestrial experimental data, which indicate anomalies at short distances beyond the minimally modified Standard Model with three massive active neutrinos. One of the sterile neutrinos is assumed to have distinctly different mass in comparison with masses of two others, that is corresponding to a $(3+1+2)$-model of neutrinos. Model parameters values used for the description of oscillations of both active and sterile massive neutrinos into the Sun are chosen. Oscillation characteristics of solar neutrinos together with sterile neutrinos contributions have been evaluated taking into account the neutrino interaction with the matter inside the Sun with the use of the standard solar model (SSM). Results obtained correlate with observational data and can be used for development of sterile neutrinos models.

hep-ph↗

arXiv2023

On the heat evolution of the early Universe

We discuss the heat history of the early Universe and its further evolution in the framework of modern cosmological models of general relativity (GR) and alternative theories of gravity. Of great importance are the new puzzling forms of matter comprising parts of our Universe, namely, dark energy and dark matter that crucially affect the Universe structure and evolution.

gr-qc↗

arXiv2023

Equations for fields with additional fundamental physical constants

The author investigates the general Lie algebra of operators of coordinates, momenta, and Lorentz group generators, which can be used in quantum gravity, theories with generalized uncertainty principle, double and triple relativity and theories with noncommutative space-time and momentum spaces. The structure constants of this algebra depend on the constants {\it c} and {\it h}, as well as additional constants with dimensions of action ({\it H}), length ({\it L}), and mass ({\it M}). In the limiting case of infinite {\it H}, {\it L}, and {\it M}, the algebra goes into that of operators of the canonical quantum theory in Minkowski space-time. Some representations of this algebra and equations for generalized fields depending on additional fundamental physical constants are given.

math-ph↗

arXiv2023

Light sterile neutrinos effects in processes with electron and muon neutrinos

Sterile neutrinos with various masses could be participated in astrophysical and cosmological processes including mixing with active neutrinos, if exist. It is considered the possible effects of mixing of active and sterile neutrinos with masses of the order or less than 1 eV. For oscillation processes involving electron and muon neutrinos, as well as for beta decay and neutrinoless double beta decay processes, the contributions of light sterile neutrinos in the characteristics of these processes are calculated. For this purpose the estimates of the mixing parameters in the model with three active and three sterile neutrinos are made taking into account experimental data. Two cases of sterile neutrinos masses distribution are considered in detail. The results obtained can be used for interpretation of available experimental data, and also for predictions of subsequent experimental results.

hep-ph↗

arXiv2022

Fundamental physical constants: current results in search for variations and their description

We consider the current results in search for and description of temporal variations of fundamental physical constants (FPCs) obtained under laboratory and astrophysical conditions. On the basis of fixed values of base constants, those FPCs have been chosen that can exhibit variations of greatest interest from the viewpoints of physics and metrology. An analysis of the current data concerning these constants is performed, and estimates of their variations on large time scales are presented. We point out the significance of studying long-term FPC variations for both practical and fundamental metrology.

hep-ph↗

arXiv2021

Interpretation of the XENON1T excess in the model with decaying sterile neutrinos

The phenomenological model with three active and three sterile neutrinos is used for interpretation of the observed XENON1T excess of electronic recoil events in the 1 -- 7 keV energy region. Assuming two sterile neutrinos with appropriate mass values decay while the third sterile neutrino is stable it is possible to explain the observed energy spectrum of electronic recoil events. Moreover using this approach three peaks in the 1 -- 7 keV energy region are predicted. Dark bosons have to mix to only a small extent with photons which can be emitted in this region. The possible existence of the three light sterile neutrinos may have perceptible influence on some phenomena in neutrino physics, astrophysics and cosmology.

hep-ph↗

arXiv2020

Active neutrino oscillations and double beta decay characteristics with sterile neutrinos contributions

Light sterile neutrinos contributions both for active neutrinos oscillations and neutrinoless double beta decay characteristics are estimated in the framework of the phenomenological model with three active and three sterile neutrinos assuming the Majorana nature of neutrino. Appearance and survival probabilities for active neutrinos with contributions of eV-sterile neutrinos in application to the short-baseline anomalies in neutrino data are obtained at the same test values of the model parameters. Modified graphical dependences for the survival probability of electron neutrinos/antineutrinos and the probability of appearance of electron neutrinos/antineutrinos in muon neutrino/antineutrino beams as functions of distance and other model parameters at different neutrino energies, and also as functions of the ratio of the distance to the neutrino energy are presented. A significant difference was found between the probability curves of the considered neutrino model and the simple sinusoidal curves of the neutrino model with one sterile neutrino. Effective electron neutrino masses for the beta decay and the neutrinoless double beta decay are estimated with account of eV-sterile neutrinos contributions. Besides, the two-neutrino double beta decay characteristics for selenium-82 are calculated. These findings can be used for interpretation and prediction of results of ground-based experiments on search for the sterile neutrinos as well as the neutrinoless double beta decay.

hep-ph↗

arXiv2019

Sterile neutrinos influence on oscillation characteristics of active neutrinos at short distances in the generalized model of neutrino mixing

A phenomenological model with active and sterile neutrinos is used for calculations of neutrino oscillation characteristics at the normal mass hierarchy of active neutrinos. Taking into account the contributions of sterile neutrinos, appearance and survival probabilities for active neutrinos are calculated. Modified graphical dependencies for the probability of appearance of electron neutrinos/antineutrinos in muon neutrino/antineutrino beams as a function of the ratio of the distance to the neutrino energy and other model parameters are obtained. It is shown that in the case of a certain type mixing between active and sterile neutrinos it is possible to clarify some features of the anomalies of neutrino data at short distances. A new parametrization for a particular type mixing matrix of active and sterile neutrinos that takes into account the additional sources of CP violation is used. The comparison with the existing experimental data is performed and, with using this knowledge, the estimates of some model parameters are found. The theoretical results obtained for mixing of active and sterile neutrinos can be applied for interpretation and prediction of results of ground-based experiments on search of sterile neutrinos as well as for analyses of some astrophysical data.

hep-ph↗

arXiv2017

Alternative set of defining constants for redefinition of four SI units

We discuss different sets of defining constants, fixed values of which are considered in connection with the transition to new definitions of four SI units (the kilogram, the mole, the ampere, and the kelvin). The notion of constant's order in a given system of units is suggested. We propose an alternative set of fixed constants applicable for new definitions of the four SI units. We analyse and discuss in detail the set, which consists of the Planck constant, the Avogadro constant, the Boltzmann constant and the magnetic constant.

physics.ins-det↗

arXiv2017

Neutrino Fluxes from a Core-Collapse Supernova in a Model with Three Sterile Neutrinos

The characteristics of the gravitational collapse of a supernova and the fluxes of active and sterile neutrinos produced during the formation of its protoneutron core have been calculated numerically. The relative yields of active and sterile neutrinos in core matter with different degrees of neutronization have been calculated for various input parameters and various initial conditions. A significant increase in the fraction of sterile neutrinos produced in superdense core matter at the resonant degree of neutronization has been confirmed. The contributions of sterile neutrinos to the collapse dynamics and the total flux of neutrinos produced during collapse have been shown to be relatively small. The total luminosity of sterile neutrinos is considerably lower than the luminosity of electron neutrinos, but their spectrum is considerably harder at high energies.

astro-ph.HE↗

arXiv2016

Oscillation characteristics of active and sterile neutrinos and neutrino anomalies at shot distances

A generalized phenomenological (3 + 2 + 1)-model with three active and three sterile neutrinos is considered for the calculation of the neutrino oscillation characteristics at normal mass hierarchy of active neutrinos and significant splitting between the mass of one sterile neutrino and the masses of other two sterile neutrinos. A new parametrization and a certain form of the general neutrino mixing matrix for active and sterile neutrinos are suggested taking into account the possible violation of CP invariance in the lepton sector. The test values of the neutrino masses and the mixing parameters are chosen. The transition probabilities for the different flavors of neutrino, which can be transformed into each other, are calculated, and the graphical dependences are obtained for the disappearance probability of muon neutrino/antineutrino and appearance probability of electron neutrino/antineutrino in the muon neutrino/antineutrino jet as a function of distance and other model parameters at their acceptable values and at neutrino energies not higher than 50 MeV, as well as a function of the ratio of the distance to the neutrino energy. It is shown that in the case of the mixing matrix of a definite type (of the a_2 type) between active and sterile neutrinos the explanation of the acceleration anomaly on small distances in the neutrino data (LSND anomaly) is possible, as well as the reactor and gallium anomalies. The theoretical results obtained can be used for the interpretation and prediction of results of the ground-based neutrino experiments on searching for the sterile neutrinos, and also for the analysis of certain astrophysical observation data.

hep-ph↗

arXiv2016

SO(10) model of standard and dark matter

We consider a novel model for three standard families of left chiral states of quarks and leptons conjointly with a new family of dark matter fermionic particles and a sterile neutrino. It is suggested to use a SO(10) symmetry for description of these families for the first time. It is presented estimations of masses of dark matter particles and the sterile neutrino as well limitations for values of mixing parameters between the new family particles and active neutrinos. This model can be used for predictions and interpretations of results of experiments for sterile neutrino and dark matter particles search.

hep-ph↗

arXiv2015

Enhancement of the sterile neutrinos yield at high matter density and at increasing the medium neutronization

The relative yields of active and sterile neutrinos in the matter with a high density and different degree of neutronization are calculated. A significant increase in the proportion of sterile neutrinos produced in superdense matter when degree of neutronization approaches the value of two is found. The results obtained can be used in the calculations of the neutrino fluxes for media with a high density and different neutronization degrees in astrophysical processes such as the formation of protoneutron core of a supernova.

hep-ph↗

arXiv2015

Mass characteristics of active and sterile neutrinos in a phenomenological (3+1+2)-model

On the basis of the experimental data allowing existence of the anomalies going beyond the minimally extended Standard Model with three active neutrinos with different masses, we consider the generalized model with three active and three sterile neutrinos, one of which is relatively heavy ((3+1+2)-model). We study the basic characteristics that are used to describe the massive active and sterile neutrinos, the methods to determine the absolute scale of neutrino masses and the neutrino mass estimates based on the available experimental data. Taking into account the possible contributions of the sterile neutrinos, the dependences of the neutrino mass characteristics on the sterile neutrino mass are plotted. The results obtained can be used to interpret and to predict the results of various neutrino experiments.

hep-ph↗