scholarly journals The Physics of Tachyons IV. Tachyon Electrodynamics

1998 ◽  
Vol 51 (3) ◽  
pp. 477
Author(s):  
Ross L. Dawe ◽  
Kenneth C. Hines
Keyword(s):  
Dipole Moment ◽  
Collision Energy ◽  
Cherenkov Radiation ◽  
Mathematical Proof ◽  
Dielectric Materials ◽  
Dielectric Medium ◽  
Current Loop ◽  
Dielectric Media ◽  
Viable Approach ◽  
New Formulation

A new formulation of the theory of tachyons using the same two postulates as in specialrelativity is applied to the electrodynamics of material media. A discussion of Lagrange’s equations and Hamilton’s equations for ‘classical’ charged tachyons shows that such a formalism is a viable approach. An essay is included on why tachyons can be considered to be localised particles for the purpose of calculations. Tachyonic transformations of the electromagneticfields D, P, H and M are shown to be the same as for bradyonic transformations. Examples discussed include the electric dipole moment of a tachyonic current loop, constitutive equations, polarisation in tachyonic dielectric materials and the velocity of light in tachyonic dielectric media. This is followed by discussions of the collision energy loss for charged tachyonsinteracting with a material medium and a mathematical proof that tachyons cannot emit Cherenkov radiation when passing through a bradyonic dielectric medium.

HQC with the AC setup associated with topological defects

2011 ◽  
Vol 11 (5&6) ◽  
pp. 444-455
Author(s):  
Knut Bakke ◽  
Cláudio Furtado
Keyword(s):  
Dipole Moment ◽  
Electric Field ◽  
Magnetic Dipole ◽  
Magnetic Dipole Moment ◽  
Topological Defect ◽  
Dipole Moments ◽  
Topological Defects ◽  
Quantum Phases ◽  
Neutral Particles ◽  
New Formulation

In this work, we propose a new formulation allowing to realize the holonomic quantum computation with neutral particles with a permanent magnetic dipole moments interacting with an external electric field in the presence of a topological defect. We show that both the interaction of the electric field with the magnetic dipole moment and the presence of topological defect generate independent contributions to the geometric quantum phases which can be used to describe any arbitrary rotation on the magnetic dipole moment without using the adiabatic approximation.

Electrochemically Prepared Pore Arrays for Photonic-Crystal Applications

MRS Bulletin ◽  
2001 ◽  
Vol 26 (8) ◽  
pp. 623-626 ◽  
Author(s):  
R.B. Wehrspohn ◽  
J. Schilling
Keyword(s):  
Photonic Crystal ◽  
Photonic Crystals ◽  
Electromagnetic Waves ◽  
Porous Alumina ◽  
Dielectric Materials ◽  
Dielectric Medium ◽  
Geometrical Parameters ◽  
Quarter Wavelength ◽  
Physically Based ◽  
1D Photonic Crystal

In the last few years, photonic crystals have gained considerable interest due to their ability to “mold the flow of light.” Photonic crystals are physically based on Bragg reflections of electromagnetic waves. In simple terms, a one-dimensional (1D) photonic crystal is a periodic stack of thin dielectric films with two different refractive indices, n1 and n2. The two important geometrical parameters determining the wavelength of the photonic bandgap are the lattice constant, a = d1(n1) + d2(n2), and the ratio of d1 to a (where d1 is the thickness of the layer with refractive index n1, and d2 is the thickness of layer n2). For a simple quarter-wavelength stack, the center wavelength λ of the 1D photonic crystal would be simply λ = 2n1d1 + 2n2d2. In the case of 2D photonic crystals, the concept is extended to either airholes in a dielectric medium or dielectric rods in air. Therefore, ordered porous dielectric materials like porous silicon or porous alumina are intrinsically 2D photonic crystals.

scholarly journals Theory of Cherenkov radiation in periodic dielectric media: Emission spectrum

2009 ◽  
Vol 79 (1) ◽  
Author(s):  
Christian Kremers ◽  
Dmitry N. Chigrin ◽  
Johann Kroha
Keyword(s):  
Emission Spectrum ◽  
Cherenkov Radiation ◽  
Dielectric Media

Study of the thermal properties of polymeric dielectric materials by photothermal technique

1998 ◽  
Vol 511 ◽  
Author(s):  
Chuan Hu ◽  
Ennis T. Ogawa ◽  
Michael F. Hay ◽  
Paul S. Ho
Keyword(s):  
Optical Properties ◽  
Thermal Properties ◽  
Thermal Diffusivity ◽  
Dielectric Materials ◽  
Dielectric Medium ◽  
Photothermal Technique ◽  
Thermal Anisotropy ◽  
Integrated Devices ◽  
Out Of Plane ◽  
Low K

ABSTRACTIn this paper, we present some results of the newly developed on-wafer photothermal measurement. To study thermal anisotropy, the out-of-plane thermal diffusivity measured from this technique is compared with the in-plane thermal diffusivity by measured by ISTS [1]. In addition to the thermal properties, the agreement with mechanical [2] and optical properties are also shown. The significance of different thermal performance between low K dielectric medium materials and SiO2 suggests that greater attention should be paid to thermal properties for integrated devices with low K materials.

scholarly journals Light in dielectric media and scalar fields in a de Sitter spacetime

2021 ◽  
Vol 81 (8) ◽  
Author(s):  
I. A. Pedrosa ◽  
B. F. Ramos ◽  
K. Bakke
Keyword(s):  
Scalar Field ◽  
Coherent States ◽  
Scalar Fields ◽  
Dielectric Medium ◽  
De Sitter Spacetime ◽  
De Sitter ◽  
Expectation Values ◽  
Dielectric Media ◽  
Sitter Spacetime ◽  
Constant Rate

AbstractIn the present work we discuss the behavior of light in a linear dielectric medium with a time-varying electric permittivity that increases exponentially at a constant rate and of a scalar field in a de Sitter spacetime, in both the classical and quantum contexts. Notably, we find that the behavior of these two systems are identical and can be described by similar Hamiltonians. By using the Lewis–Riesenfeld invariant method together with Fock states we solve the time-dependent Schrödinger equation for this problem and use its solutions to construct coherent states for the scalar field. Finally, we employ both the Fock and coherent states to evaluate some important properties of the quantized scalar field, such as expectation values of the amplitude and momentum of each mode their variances and the respective uncertainty principle.

scholarly journals Pareto Optimization of Oligomer Polarizability and Dipole Moment using a Genetic Algorithm

2021 ◽  
Author(s):  
Danielle Hiener ◽  
Geoffrey Hutchison
Keyword(s):  
Genetic Algorithm ◽  
Dipole Moment ◽  
High Performance ◽  
Density Functional ◽  
Chemical Space ◽  
Dipole Moments ◽  
Tight Binding ◽  
Dielectric Materials ◽  
Underlying Structure ◽  
Large Set

High performance electronic components are highly sought after in order to produce increasingly smaller and cheaper electronic devices. Drawing inspiration from inorganic dielectric materials, in which both polarizability and polarization contribute, organic materials can also maximize both. For a large set of small molecules drawn from PubChem, a Pareto-like front appears between polarizability and dipole moment indicating the presence of an apparent trade-off between these two properties. We tested this balance in π-conjugated materials by searching for novel conjugated hexamers with simultaneously large polarizabilities and dipole moments with potential use for dielectric materials. Using a genetic algorithm (GA) screening technique in conjunction with an approximate density functional tight binding method (GFN2-xTB) for property calculations, we were able to efficiently search chemical space for optimal hexamers. Given the scope of chemical space, using the GA technique saves considerable time and resources by speeding up molecular searches compared to a systematic search. We also explored the underlying structure-function relationships, including sequence and monomer properties, that characterize large polarizability and dipole moment regimes.

scholarly journals Lorentz transformation of a charge-current density and “relativistic polarization” of a moving current loop

2020 ◽  
Vol 35 (23) ◽  
pp. 2050135
Author(s):  
Alexander Kholmetskii ◽  
Oleg Missevitch ◽  
Tolga Yarman
Keyword(s):  
Electromagnetic Field ◽  
Dipole Moment ◽  
Electric Dipole ◽  
Physical Meaning ◽  
Classical Electrodynamics ◽  
Current Loop ◽  
Lorentz Transformations ◽  
Covariant Formulation ◽  
Magnetic Dipoles ◽  
A Charge

We show that the claim by Franklin (Int. J. Mod. Phys. A 35, 2050061 (2020)) with respect to the vanishing charge distribution over the perimeter of an electrically neutral moving current loop is erroneous and is based on a misinterpretation of physical meaning of Lorentz transformations. Moreover, we show that the development of nonvanishing electric dipole moment by a moving current loop (which we named as “relativistic polarization”) represents a direct implication of covariant formulation of classical electrodynamics of material media. In this respect, we analyze some subtle effects related to the motion of magnetic dipoles in an electromagnetic field and disclose their physical meaning.

Cherenkov radiation near a dielectric medium at finite temperatures

1997 ◽  
Vol 240 (1-2) ◽  
pp. 68-75 ◽  
Author(s):  
E.B. Manoukian ◽  
C.-H. Eab ◽  
A. Ungkitchanukit
Keyword(s):  
Cherenkov Radiation ◽  
Dielectric Medium
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