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A. Studenikin

Publications and source records attributed to A. Studenikin.

16 recordsLinked to original sources
arXiv2025

The influence of majorons on neutrino oscillations in the presence of a magnetic field and matter

Neutrino spin-flavour oscillations in the magnetic field, matter, and majoron fields are studied. The effective Lagrangian of Majorana neutrino interaction with a majoron field mediated by heavy neutrino is calculated. It is shown that the presence of a majoron field with a high energy density significantly shifts the resonances in neutrino oscillations, or even induces new resonances. The influence of the majoron suppresses oscillations for neutrino energies below 10 MeV. Additionally, the dependence of the oscillations probabilities on the Dirac and Majorana CP-violating phases becomes weaker under the influence of a dense majoron field. These findings can be applied to experiments that study neutrinos from supernovae, such as JUNO, DUNE, and the upcoming Hyper-Kamiokande experiment.

hep-ph↗
arXiv2024

Oscillations of Majorana neutrinos in supernova and CP violation

Leptonic CP violation is one of the most important topics in neutrino physics. CP violation in the neutrino sector is strongly related to the nature of neutrinos: whether they are Dirac or Majorana particles. In \cite{Popov:2021icg} we have shown that for Majorana neutrinos appearance of nonzero Majorana CP-violating phases combined with strong magnetic field during supernova core-collapse can induce new resonances in neutrino oscillations, for example in $ν_e \to \barν_τ$ channel. In this paper we further study new resonances in Majorana neutrino oscillations, in particular energy dependence of amplitudes of resonant oscillations. Our findings suggest a potential astrophysical setup for studying the nature of neutrino masses and leptonic CP violation and may be important for future neutrino experiments, such as JUNO, Hyper-Kamiokande and DUNE.

hep-ph↗
arXiv2021

Neutrino spin operator and dispersion in moving matter

We found a spin integral of motion for neutrino, which propagates in moving and polarized matter. The operator obtained opens up the possibility of consistent classification of neutrino states in such a medium and, as a consequence, a systematic description of the related physical phenomena. Using the operator, we obtain a dispersion relation for neutrinos and consider its particular cases.

hep-ph↗
arXiv2014

The effect of plasmon mass on spin light of neutrino in dense matter

We develop the theory of spin light of neutrino in matter ($SLν$) and include the effect of plasma influence on the emitted photon. We use the special technique based on exact solutions of particles wave equations in matter to perform all the relevant calculations, and track how the plasmon mass enters the process characteristics including the neutrino energy spectrum, $SLν$ rate and power. The new feature it induces is the existence of the process threshold for which we have found the exact expression and the dependence of the rate and power on this threshold condition. The $SLν$ spatial distribution accounting for the above effects has been also obtained. These results might be of interest in connection with the recently reported hints of ultra-high energy neutrinos $E = 1 ÷10$ PeV observed by IceCube.

hep-ph↗
arXiv2012

Electromagnetic Properties of Neutrinos

In this review we discuss the main theoretical aspects and experimental effects of neutrino electromagnetic properties. We start with a general description of the electromagnetic form factors of Dirac and Majorana neutrinos. Then, we discuss the theory and phenomenology of the magnetic and electric dipole moments, summarizing the experimental results and the theoretical predictions. We discuss also the phenomenology of a neutrino charge radius and radiative decay. Finally, we describe the theory of neutrino spin and spin-flavor precession in a transverse magnetic field and we summarize its phenomenological applications.

hep-ph↗
arXiv2010

On the problem of relativistic particles motion in strong magnetic field and dense matter

We consider a problem of electron motion in different media and magnetic field. It is shown that in case of nonmoving medium and constant homogenious magnetic field the electron energies are quantized. We also discuss the general problem of eigenvectors and eigenvalues of a given class of Hamiltonians. We examine obtained exact solutions for the particular case of the electron motion in a rotating neutron star with account for matter and magnetic field effects. We argue that all of these considerations can be usefull for astrophysical applications.

hep-ph↗
arXiv2010

Electrically Millicharged Neutrino in Media

On the basis of nonzero neutrino electromagnetic properties, we consider a problem of electrically millicharged neutrino energy spectra in a magnetized matter. It is shown that in this case neutrino energies are quantized. These phenomena can be important for astrophysical applications.

hep-ph↗
arXiv2009

Neutrino magnetic moment and neutrino energy quantization in rotating media

After a brief discussion on neutrino electromagnetic properties, we consider the problem of neutrino energy spectra in different media. It is shown that in two particular cases (i.e., neutrino propagation in a) transversally moving with increasing speed medium and b) rotating medium) neutrino energies are quantized. These phenomena can be important for astrophysical applications, for instance, for physics of rotating neutron stars.

hep-ph↗
arXiv2005

Quantum Theory of Neutrino Spin-Light in Matter

The quantum theory of the spin light of neutrino ($SLν$) exactly accounting for the effect of the background matter is developed. The $SLν$ rate and power, and also the emitted photon's energy are obtained for the different values of the neutrino momentum and density of matter. The spatial distribution of the radiation power and the dependence of the emitted photon's energy on the direction of radiation are studied. It is also shown that, in a wide range of the neutrino momentum and densities of matter, the $SLν$ radiation is characterized by nearly total circular polarization. Conditions for the effective neutrino spin-light radiation in the electron plasma are discussed.

hep-ph↗
arXiv2003

Spin light of neutrino in matter and electromagnetic fields

A new type of electromagnetic radiation by a neutrino with non-zero magnetic (and/or electric) moment moving in background matter and electromagnetic field is considered. This radiation originates from the quantum spin flip transitions and we have named it as "spin light of neutrino"($SLν$). The neutrino initially unpolarized beam (equal mixture of $ν_{L}$ and $ν_{R}$) can be converted to the totally polarized beam composed of only $ν_{R}$ by the neutrino spin light in matter and electromagnetic fields. The quasi-classical theory of this radiation is developed on the basis of the generalized Bargmann-Michel-Telegdi equation. The considered radiation is important for environments with high effective densities, $n$, because the total radiation power is proportional to $n^{4}$. The spin light of neutrino, in contrast to the Cherenkov or transition radiation of neutrino in matter, does not vanish in the case of the refractive index of matter is equal to unit. The specific features of this new radiation are: (i) the total power of the radiation is proportional to $γ^{4}$, and (ii) the radiation is beamed within a small angle $δθ\sim γ^{-1}$, where $γ$ is the neutrino Lorentz factor. Applications of this new type of neutrino radiation to astrophysics, in particular to gamma-ray bursts, and the early universe should be important.

hep-ph↗
arXiv2002

Neutrino spin evolution in presence of general external fields

The derivation of the quasiclassical Lorentz invariant neutrino spin evolution equation taking into account general types of neutrino non-derivative interactions with external fields is presented. We discuss the constraints on the characteristics of matter and neutrino under which this quasiclassical approach is valid. The application of the obtained equation for the case of the Standard Model neutrino interactions with moving and polarized background matter is considered.

hep-ph↗
arXiv2002

Effect of Matter Motion and Polarization in Neutrino Flavour Oscillations

The Lorentz invariant formalism for description of neutrino flavor oscillation in moving and polarized matter is developed. It is shown that the neutrino effective potential, which determines the effective mass difference between neutrinos in matter can be sufficiently changed by relativistic motion of matter. In the case of matter motion parallel to neutrino propagation, matter effects in neutrino flavor oscillations are suppressed. In the case of relativistic motion of matter in the opposite direction sufficient increase of effects of matter in neutrino oscillations is predicted. The dependence of the matter term in neutrino effective potential on the values and correlations of the three vectors, the neutrino and matter speeds and matter polarization, is discussed in details.

hep-ph↗
arXiv2002

The Mikheyev-Smirnov-Wolfenstein Effect in Moving Matter

The Lorentz invariant formalism for description of neutrino flavour oscillations in moving matter is developed. It is shown that the matter motion with relativistic speed can sufficiently change the matter term in the neutrino effective potential. In the case of matter motion parallel to neutrino propagation, matter effects in neutrino flavour oscillations are suppressed. In the case of relativistic motion of matter in the opposite direction in respect to neutrino propagation, sufficient increase of effects of matter in neutrino oscillations is predicted. The effective neutrino flavour oscillation probability, effective mixing angle and oscillation length, as well as the MSW effect resonance condition for the case of moving matter are derived.

hep-ph↗
arXiv2001

Neutrino Oscillations in Moving and Polarized Matter under the Influence of Electromagnetic Fields

Within the recently proposed \cite{ELSt99, ELStpl00, ELSt00} Lorentz invariant formalism for description of neutrino spin evolution in presence of an arbitrary electromagnetic fields matter motion and polarization effects are considered. It is shown that in the case of matter moving with relativistic speed parallel to neutrino propagation, matter effects in neutrino spin (and also flavour) oscillations are suppressed. In the case of relativistic motion of matter in the opposite direction in respect to neutrino propagation, sufficient increase of effects of matter in neutrino oscillations is predicted. These phenomena could have important consequences in different astrophysical environments.

hep-ph↗
arXiv2001

Parametric Resonance of Neutrino Oscillations in Electromagnetic Wave

Within the Lorentz invariant formalizm for description of neutrino evolution in electromagnetic fields and matter we consider neutrino spin oscillations in the circular polarized electromagnetic wave, the amplitude of which is a modulated function of time. It is shown for the first time that the parametric resonance of neutrino oscillations can occur in such a system.

hep-ph↗