scholarly journals Condensation of Neutral Vector Bosons with Magnetic Moment

2017 ◽  
Vol 45 ◽  
pp. 1760047 ◽  
Author(s):  
Gretel Quintero Angulo ◽  
Aurora Pérez Martínez ◽  
Hugo Pérez Rojas
Keyword(s):  
Magnetic Field ◽  
Magnetic Fields ◽  
Magnetic Moment ◽  
Magnetic Field Intensity ◽  
Rest Mass ◽  
Critical Value ◽  
Equation Of Motion ◽  
Vector Bosons ◽  
Neutral Vector ◽  
The Magnetic Field

We study the equation of motion of neutral vector bosons bearing a magnetic moment (MM). The effective rest mass of vector bosons is a decreasing function of the magnetic field intensity. Consequently a diffuse condensation of the bosons appears below a critical value of the field. For typical values of densities and magnetic fields the magnetization is positive and the neutral boson system can maintain a magnetic field self-consistently. A discussion of the relevance in astrophysics is presented.

scholarly journals A Quantum Charged Particle under Sudden Jumps of the Magnetic Field and Shape of Non-Circular Solenoids

2019 ◽  
Vol 1 (2) ◽  
pp. 193-207 ◽  
Author(s):  
Viktor V. Dodonov ◽  
Matheus B. Horovits
Keyword(s):  
Magnetic Field ◽  
Charged Particle ◽  
Magnetic Fields ◽  
Electric Fields ◽  
Cross Sections ◽  
Magnetic Moment ◽  
Landau Gauge ◽  
Time Dependent ◽  
The Mean ◽  
The Magnetic Field

We consider a quantum charged particle moving in the x y plane under the action of a time-dependent magnetic field described by means of the linear vector potential of the form A = B ( t ) − y ( 1 + β ) , x ( 1 − β ) / 2 . Such potentials with β ≠ 0 exist inside infinite solenoids with non-circular cross sections. The systems with different values of β are not equivalent for nonstationary magnetic fields or time-dependent parameters β ( t ) , due to different structures of induced electric fields. Using the approximation of the stepwise variations of parameters, we obtain explicit formulas describing the change of the mean energy and magnetic moment. The generation of squeezing with respect to the relative and guiding center coordinates is also studied. The change of magnetic moment can be twice bigger for the Landau gauge than for the circular gauge, and this change can happen without any change of the angular momentum. A strong amplification of the magnetic moment can happen even for rapidly decreasing magnetic fields.

SELF-MAGNETIZATION IN ELECTROWEAK VACUUM AND IN VERY DENSE SYSTEMS

2011 ◽  
Vol 20 (supp02) ◽  
pp. 168-175
Author(s):  
HUGO PÉREZ ROJAS ◽  
ELIZABETH RODRÍGUEZ QUERTS
Keyword(s):  
Magnetic Field ◽  
High Temperature ◽  
External Field ◽  
Magnetic Moment ◽  
Anomalous Magnetic Moment ◽  
W Bosons ◽  
Large Density ◽  
Electron Positron ◽  
Vector Bosons ◽  
The Magnetic Field

For charged vector bosons (W bosons) of mass mw, magnetization diverges for B → Bcw, which suggests that if the magnetic field is large enough, it can be self-consistently maintained. For photons bearing an anomalous magnetic moment, having a sufficiently large density, their contribution to magnetization might become of the same order than the applied external field, leading also to self-magnetization. We discuss these models in connection to the case of radiation in equilibrium at high temperature (T ~ mc2) coexisting with hot magnetized electron-positron pairs.

scholarly journals Dissipation of Turbulent Magnetic Fields in Accreting Black Holes

1997 ◽  
Vol 163 ◽  
pp. 749-750 ◽  
Author(s):  
Victor Kowalenko ◽  
Fulvio Melia
Keyword(s):  
Magnetic Field ◽  
Black Holes ◽  
Black Hole ◽  
Magnetic Fields ◽  
Magnetic Field Intensity ◽  
Tearing Mode ◽  
Massive Black Hole ◽  
Basic Principles ◽  
Alternative Approach ◽  
The Magnetic Field

AbstractCalculations of the spectrum resulting from accretion onto a massive black hole often make use of the “equipartition assumption” in order to estimate the magnetic field intensity. Thus, the mechanism for the dissipation of the magnetic field and the resulting dynamical influence on the gas have not been treated quantitatively, nor self-consistently. Here, we introduce an alternative approach for modelling the magnetic field dissipation from basic principles, using current ideas about turbulent fields and tearing mode instabilities.

scholarly journals Correlation between Ca plages and longitudinal magnetic fields of the CSSAR active regions

1968 ◽  
Vol 35 ◽  
pp. 338-345 ◽  
Author(s):  
V. Bumba ◽  
G. Godoli
Keyword(s):  
Magnetic Field ◽  
Magnetic Fields ◽  
Field Intensity ◽  
Solar Disk ◽  
Magnetic Field Intensity ◽  
Active Regions ◽  
The Magnetic Field ◽  
Magnetic Inclusions

The shapes of K2,3,2 Ca plages and longitudinal magnetic fields are compared for CSSAR active regions during their first transit on the solar disk.The bipolar magnetic regions follow the Hale polarity law.Often the region of inversion of the magnetic field corresponds to a gap in the Ca plage structure.Bright patches of plages may coincide with magnetic inclusions, magnetic hills, and occasionally also with regions of inversion of the magnetic field. The outline of Ca plages follow well the isogauss of 20–40 oersted.Histograms of the distances of individual magnetic field intensity peaks do not only correspond to the geometry of the supergranular network but also seem to indicate a difference in the organization of these peaks between the leading and following polarities.

RSFP PREDICTIONS FOR TRANSVERSE SOLAR MAGNETIC FIELD DISTRIBUTION FROM SOLAR NEUTRINO DATA

1998 ◽  
Vol 13 (15) ◽  
pp. 1163-1170 ◽  
Author(s):  
B. C. CHAUHAN ◽  
U. C. PANDEY ◽  
S. DEV
Keyword(s):  
Magnetic Field ◽  
Magnetic Fields ◽  
Field Distribution ◽  
Magnetic Moment ◽  
Solar Neutrino ◽  
Solar Magnetic Field ◽  
Magnetic Field Distribution ◽  
The Sun ◽  
Solar Magnetic Fields ◽  
The Magnetic Field

Even though the standard solar model (SSM) has been very successful in predicting the thermal and nuclear evolution of the Sun, it does not throw enough light on solar magnetic activity. In the absence of a generally accepted theory of solar dynamo, various general arguments have been put forth to constrain solar magnetic fields. In the absence of reliable knowledge of solar magnetic fields from available astrophysical data, it may be worthwhile to constrain the solar magnetic fields from solar neutrino observations assuming Resonant Spin-Flavor Precession (RSFP) to be responsible for the solar neutrino deficit. The configuration of solar magnetic field derived in this work is in reasonably good agreement with the magnetic field distribution proposed by Akhmedov et al. (Sov. Phys. JETP68, 250 (1989)). However, the magnetic field distribution in the radiation zone used by Pulido (Phys. Rep.211, 167 (1992)) is ruled out. The magnitude of the magnetic field in the radiation and convective zones of the Sun are very sensitive to the value chosen for the neutrino magnetic moment. However, any change in the value of neutrino magnetic moment does not affect the magnetic field distribution as it only scales the magnetic field strength at different points by the same amount.

scholarly journals PAIR PRODUCTION IN A TIME-DEPENDENT MAGNETIC FIELD

1999 ◽  
Vol 14 (18) ◽  
pp. 1183-1192 ◽  
Author(s):  
GIORGIO CALUCCI
Keyword(s):  
Magnetic Field ◽  
Magnetic Fields ◽  
Pair Production ◽  
Rest Mass ◽  
Landau Levels ◽  
Time Dependent ◽  
Electron Positron ◽  
Astrophysical Objects ◽  
The Magnetic Field

The production of electron–positron pairs in a time-dependent magnetic field is estimated in the hypotheses that the magnetic field is uniform over large distances with respect to the pair localization and it is so strong that the spacing of the Landau levels is larger than the rest mass of the particles. This calculation is presented since it has been suggested that extremely intense and varying magnetic fields may be found around some astrophysical objects.

Estimation of informative and background signals ratio in the registration of magnetic fields of surface defects by magnetic measuring transducers

2020 ◽  
pp. 43-49
Author(s):  
Yuriy L. Nikolaev ◽  
Elina F. Akhmetshina ◽  
Aleksey A. Samorukov ◽  
Aleksandra V. Chernova
Keyword(s):  
Magnetic Field ◽  
Magnetic Fields ◽  
Field Intensity ◽  
Output Signal ◽  
Magnetic Field Intensity ◽  
Background Ratio ◽  
Estimated Parameters ◽  
Magnetic Measuring ◽  
Background Magnetic Field ◽  
The Magnetic Field

Authors propose algorithms for quantitative ratio determining of informative and background components of the output signal of magnetic measuring transducers, used as a means of recording and measuring the parameters of locally distributed magnetic fields that occur over defective surface areas of the tested object in an applied permanent magnetic field. The method of separating the informative and background components based on the summation property and the deterministic nature of the distributions of the magnetic field intensity of the defect and the background magnetic field along the coordinate axis parallel to the controlled surface, and analysis of the topography of the distribution of magnetic field intensity is described. The approach to selection and experimental determination of estimated parameters characterizing the levels of informative and background signals is justified. Authors give the formulas for calculating the signal-to-background ratio based on the measured values of the estimated parameters applied to single magnet-static, differential magnet-static and differentiating magnetic measuring transducers taking into account the orientation direction (normal, tangential) of their sensitivity axis. The signal-to-background ratio calculation results are presented using an example of an analysis of the magnetic measuring transducers output signal when registering the distribution of the magnetic field intensity over the surface of a control sample with artificial defects of a given size. The comparative analysis of considered magnetic measuring transducers according to signal-to-background ratio is carried out. General recommendations to increase the value of the signal-to-background ratio parameter are given.

scholarly journals The Role of Magnetic Fields in the Origin and Structure of Planetary Nebulae

1968 ◽  
Vol 34 ◽  
pp. 279-281
Author(s):  
Donald H. Menzel
Keyword(s):  
Magnetic Field ◽  
Magnetic Fields ◽  
Field Intensity ◽  
Magnetic Field Intensity ◽  
Planetary Nebulae ◽  
Ionized Gas ◽  
Symmetrical Structure ◽  
Image Position ◽  
The Magnetic Field

That the characteristic, quasi-symmetrical structure of planetary nebulae may result from the presence of imbedded magnetic fields has undoubtedly occurred to many astronomers. Gurzadian (1962), for example, employed the widely used equation where p is the pressure of the ionized gas and H the magnetic-field intensity. This equation specifies that the sum of the gas and magnetic pressures should be constant for a given value of the radius.

Condensation and Magnetization of Charged Vector Boson Gas

1997 ◽  
Vol 12 (27) ◽  
pp. 1973-1981 ◽  
Author(s):  
V. R. Khalilov ◽  
Choon-Lin Ho ◽  
Chi Yang
Keyword(s):  
Magnetic Field ◽  
Ground State ◽  
Weak Magnetic Field ◽  
Vector Boson ◽  
Critical Value ◽  
Einstein Condensation ◽  
Bose Einstein Condensation ◽  
Vector Bosons ◽  
Bose Einstein ◽  
The Magnetic Field

The magnetic properties of charged vector boson gas are studied in the very weak, and very strong (near critical value) external magnetic field limits. When the density of the vector boson gas is low, or when the external field is strong, no true Bose–Einstein condensation occurs, though significant amount of bosons will accumulate in the ground state. The gas is ferromagnetic in nature at low temperature. However, Bose–Einstein condensation of vector bosons (scalar bosons as well) is likely to occur in the presence of a uniform weak magnetic field when the gas density is sufficiently high. A transitional density depending on the magnetic field seems to exist below which the vector boson gas changes its property with respect to the Bose–Einstein condensation in a uniform magnetic field.

Variation of Surface Tension of Water in High Magnetic Field

2013 ◽  
Vol 750-752 ◽  
pp. 2279-2282 ◽  
Author(s):  
Long Chen ◽  
Chuan Jun Li ◽  
Zhong Ming Ren
Keyword(s):  
Magnetic Field ◽  
Surface Tension ◽  
Magnetic Fields ◽  
Hydrogen Bonds ◽  
High Magnetic Field ◽  
Field Intensity ◽  
Magnetic Field Intensity ◽  
High Magnetic Fields ◽  
The Magnetic Field

The surface tension of water in high magnetic fields up to 10T was investigated with aid of the high-magnetic-field tensiometer (HMFT). It was found that the surface tension of water linearly varied with the magnetic field intensity and increased by 0.48mN/m or 0.65% in 10T. The increase of the surface tension of water could be attributed to the increase in the number and stabilization of the hydrogen bonds in the magnetic field.

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