Physics - General Physics Publications (50)

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Physics - General Physics Publications

It is shown that the familiar Larmor's formula or its relativistic generalization, Li\'enard's formula, widely believed to represent the instantaneous radiative losses from an accelerated charge, are not compatible with the special theory of relativity (STR). We demonstrate this in the case of a charge emitting synchrotron radiation where the agency responsible for acceleration (the magnetic field) does no work and thus all the energy-momentum carried by the radiation has to be balanced unambiguously against the kinetic energy-momentum of the moving charge. The application of the radiation reaction inferred from Larmor's/Li\'enard's formulas in two different inertial frames, yields results that are not in conformity with the relativistic transformations. Read More


This article contains a discussion in which we showed that observation of splitting in the energy levels of prolate nuclei, is possible. Similar effects is atomic physics is known as Zeeman effect which is well-known, but in nuclear physics such topic has not been discussed and mentioned if it is possible or is not. In this article, after introducing deformation in commutation relation in three dimensional, these relations has been used in X(3) model. Read More


The physical constructs underlying the properties of quantum mechanics are explored. Arguments are given that the particle wave function as well as photon and phonon quanta must derive from a more fundamental physical construct that has not yet been identified. An approach to identifying the construct is discussed and a specific construct is proposed and explained. Read More


The present paper is based upon ideas and results obtained in an earlier paper by the author devoted to a new formulation of quantum electrodynamics. The equations derived in that paper depict the structure and properties of the electron as well as of other leptons including neutrinos. Since in nature there are only two stable charged elementary particles, the electron and proton (with their antiparticles), it is logical to suppose that in nature there is a protonic field too whose description is analogous with the one of the electronic field. Read More


We show that applying the Lorentz-Lorenz transformation to the refractive index of metals, semiconductors and insulators allows for a less empirical modeling of this refractive index. Read More


The so-called holographic principle, originally addressed to high energy physics, suggests more generally that the information contents of the system (measured by its entropy) scales as the event horizon surface. It has been formulated also a holographic super-string model for the anti de Sitter space, which allows for implementation of quantum gravity in the volume by only quantum boundary---hologram. The locally planar topology of the boundary of 3D space leads, however, to more reach possibilities of quantization of many particle systems according to representations of related braid groups (i. Read More


Hole doping of La_{2-x}Ae_xCuO_4 (Ae=Sr,Ba) and La_{2-y-x}Ln_ySr_xCuO_4 (Ln = Nd, Eu; y = 0.4, 0.2) introduces unidirectional charge density waves (CDWs) of incommensurability delta_c(x) in domains of the CuO_2 planes. Read More


2017Apr
Affiliations: 1Department of Physics, Christ University, 2Department of Physics, Christ University, 3Indian Institute of Astrophysics

The nature of dark matter (DM) and dark energy (DE) which is supposed to constitute about 95% of the energy density of the universe is still a mystery. There is no shortage of ideas regarding the nature of both. While some candidates for DM are clearly ruled out, there is still a plethora of viable particles that fit the bill. Read More


The Dirac equation requires a treatment of the step potential that differs fundamentally from the traditional treatment, because the Dirac plane waves, besides momentum and spin, are characterized by a quantum number with the physical meaning of sign of charge. Since the Hermitean operator corresponding to this quantum number does not commute with the step potential, the time displacement parameter used in the ansatz of the stationary state does not have the physical meaning of energy. Therefore there are no paradoxal values of the energy. Read More


A simple and low cost apparatus has been designed and built to measure the electrical resistivity, ($\rho$), of metal and semiconductors in 300-620 K temperature range. The present design is suitable to do measurement on rectangular bar sample by using conventional four-probe dc method. A small heater is made on the sample mounting copper block to achieve the desired temperature. Read More


This is a comment on arXiv:1611.04445 (PRL, 118, 114801 (2017)). It is pointed out that the fundamental problems in light beam vortices and the relativistic electron vortices are not identical and have subtle differences. Read More


Disappearance of interference terms due to the quantum measurement process is one of the biggest puzzles of quantum mechanics. In this short Letter, we examine Stern-Gerlach experiment and make the reason why the interference terms disappear clear with purely quantum-mechanical tools. Read More


In this paper, we study fractional order heat equation in higher space-time dimensions and offer specific role of heat flows in various fractional dimensions. We offer fractional solutions of the heat equations thus obtained, and examine the associated implications in various limiting cases. We anticipate perspective applications of fractional heat flow solutions in physical systems. Read More


The geodesic equations are considered in static mass imbedded in a uniform electromagnetic field. Due to electromagnetic field horizon shrinks and geodesics are modified. By analyzing the behavior of the effective potentials for the massless and massive particle we study the radial and circular trajectories. Read More


The belief that three dimensional space is infinite and flat in the absence of matter is a canon of physics that has been in place since the time of Newton. The assumption that space is flat at infinity has guided several modern physical theories. But what do we actually know to support this belief? A simple argument, called the "Telescope Principle", asserts that all that we can know about space is bounded by observations. Read More


Ohm's law and the Joule effect are analyzed comparatively in normal metals and superconducting materials. Whereas Ohm's law applies in identical terms in both cases, the properties of the Joule effect turn out to differ markedly. An existence criterion for persistent currents is inferred from these peculiar properties of the Joule effect, as a consequence of the second law of thermodynamics. Read More


We suggest a lecture on Newtonian gravity, discussing how the use of the scientific method allows to rule out some of the models for the shape of Earth leaving a spherical Earth as the only possibility, in agreement with empirical observation. In particular, we suggest to focus on a physical quantity, namely the gravitational acceleration, that can be both computed theoretically and measured in experiments. Rather than insisting on the numerical code for the evaluation of the gravitational acceleration -- that can be computed anyway in any numerical analysis course -- we want to focus on the formal setting of the problem, emphasizing the importance of having a mathematical formulation capable of quantitative predictions, present the result and discuss it both qualitatively and quantitatively, comparing it with daily experience. Read More


Gravitational redshift is generally reported by most of the authors without considering the influence of the energy of the test particle using various spacetime geometries such as Schwarzschild, Reissner-Nordstrom, Kerr and Kerr-Newman geometries for static, charged static, rotating and charged rotating objects respectively. In the present work, the general expression for the energy dependent gravitational redshift is derived for charged rotating body using the Kerr-Newman geometry along with the energy dependent gravity's rainbow function. It is found that the gravitational redshift is influenced by the energy of the source or emitter. Read More


The electron neutron scattering process determines the electrical and thermal conductivity of neutron stars plasma. As we approach the resonance section of the growth is much higher than the growth predicted by the perturbation theory. The stated mathematical formalism is borrowed from the theory of light which is scattered on the excited system Read More


We report the direct observation of the in-situ temperature-dependent surface segregation of Ni adatoms on single crystalline Pd surfaces using Positron annihilation induced Auger Electron Spectroscopy (PAES). For this study, a single atomic layer of Ni was grown on Pd with the crystallographic orientations Pd(111), Pd(110) and Pd(100). The sample temperature was increased from room temperature to 350$^\circ$C and the intensity of the Ni and Pd signal was evaluated from the recorded PAES spectra. Read More


The values of many phenomena in the Nature $z$ are determined in some discrete set of times t_n, separated by a small interval $\Delta t$ (which may also represent a coordinate, etc.). Let the $z$ value in neighbour point $t_{n+1}=t_n+\Delta t$ be expressed by the evolution equation as $z(t_{n+1})= z(t_n+\Delta t)=f(z(t_n))$. Read More


For the ideal Fermi gas that fills the space inside a cylindrical tube, there are calculated the thermodynamic characteristics in general form for arbitrary temperatures, namely: the thermodynamic potential, energy, entropy, equations of state, heat capacities and compressibilities. All these quantities are expressed through the introduced standard functions and their derivatives. The radius of the tube is considered as an additional thermodynamic variable. Read More


This paper begins with a theoretical explanation of why spacetime is discrete. The derivation shows that there exists an elementary length which is essentially Planck's length. We then show how the existence of this length affects time dilation in special relativity. Read More


\begin{abstract} This paper deals with a precise description of the region of {\it zitterbewegung} below the Compton scale and the stochastic nature associated with it. We endeavour to delineate this particular region by means of {\it Ito's calculus} and instigate certain features that are in sharp contrast with conventional physics. Interestingly, our work substantiates that the {\it zitterbewegung region} represents a pre-spacetime region and from therein emerges the notion of our conventional spacetime. Read More


We explain why the isotropic metric is quite appropriate to put the physical meaning of spacial variables in the theory of general relativity. Using the isotropic metric, we conclude that i)g_{00} does not become positive even inside the black hole, ii) there exists the center of the Universe if the curvature of the Universe k \ne 0, iii)the Universe is spacially finite but not colsed for k>0. Read More


The unusual mechanism of $keV$ X-ray lasing is found to be responsible for observed X-ray laser emission from metals acted either by irradiating $keV$ ions or by shock waves. Read More


Bell inequalities are usually derived by assuming locality and realism, and therefore violations of the Bell-CHSH inequality are usually taken to imply violations of either locality or realism, or both. But, after reviewing an oversight by Bell, in the Corollary below we derive the Bell-CHSH inequality by assuming only that Bob can measure along vectors b and b' simultaneously while Alice measures along either a or a', and likewise Alice can measure along vectors a and a' simultaneously while Bob measures along either b or b', without assuming locality. The violations of the Bell-CHSH inequality therefore only mean impossibility of measuring along b and b' (or along a and a') simultaneously. Read More


The paper aims to apply the complex-sedenions to explore the wavefunctions and field equations of non-Abelian gauge fields, considering the spatial dimensions of a unit vector as the color degrees of freedom in the complex-quaternion wavefunctions, exploring the physical properties of the color confinement essentially. J. C. Read More


In the paper it is demonstrated that a concrete inconsistency occurs in experimental conclusions concerning quantum foundation. This inconsistency is similar to concrete mathematical incompleteness. We would like to stress that in the derivations there are no physics assumptions. Read More


The possibility in principle is shown for the existence of Casimir electromotive force (EMF) in a configuration with parallel nanosized metal plates which are shifted relative one another. The effect is theoretically demonstrated for a configuration with two plates (wings) of finite length, the particular case of which is classical Casimir configuration with parallel plates. It is found that when the plates are strictly parallel, EMF does not appear. Read More


In this paper, we discuss the anti-evaporation of degenerate Bardeen de-Sitter black hole. We solve the perturbation equations around the Nariai space-time. The solution of the perturbations demonstrates that horizon of such black hole can increase with time and hence leads the anti-evaporation. Read More


We have studied optical metrics via null geodesics, formulated classical mechanics in optical- mechanical terms, and described the geometry of mechanical systems with drag. Then, we apply the formulation to other solutions of Einstein's equations in spherically symmetric spaces and deduce the related Binet's equation. Finally, we review the dualities between different systems arising from conformal transformations that preserve the Jacobi metric. Read More


The phenomenon of rotation of a vector under parallel transport along a closed path is known as anholonomy. In this paper we have studied the anholonomy for non-bounding cycles that is for closed paths in a curved surface that do not enclose any area and hence Stokes theorem is not applicable. This is distinct from conventional results on anholonomy for closed paths on $S_2$ since in the latter case all closed paths are bounding cycles. Read More


We review the exact solutions of several transcendental equations, obtained by Siewert and his co-workers, in the '70s. Some of them are expressed in terms of the generalized Lambert functions, recently studied by Mez\"o, Baricz and Mugnaini. For some others, precise analytical approximations are obtained. Read More


We study Bianchi type-I space time with cosmological constant lambda using some conditions. Read More


In this paper, we deform the thermodynamics of a BTZ black hole from rainbow functions in gravity's rainbow. The rainbow functions will be motivated from results in loop quantum gravity and Noncommutative geometry. It will be observed that the thermodynamics gets deformed due to these rainbow functions, indicating the existence of a remnant. Read More


We investigate the formation of virtual black holes in the context of generalized uncertainty principle (GUP), as a mediator for a proton decay process which is forbidden by the standard model. Then, we calculate the bounds of the GUP deformation parameter by the experimental bound on the half life of the proton. Read More


The Sagnac effect has been shown in inertial frames as well as rotating frames. We solve the problem of the generalized Sagnac effect in the standard synchronization of clocks. The speed of a light beam that traverses an optical fiber loop is measured with respect to the proper time of the light detector, and is shown to be other than the constant c, though it appears to be c if measured by the time standard-synchronized. Read More


In this work we present an exact solution of the Einstein-Maxwell field equations describing compact, charged objects within the framework of classical general relativity. Our model is constructed by embedding a four-dimensional spherically symmetric static metric into a five dimensional flat metric. The source term for the matter field is composed of a perfect fluid distribution with charge. Read More


The dynamics of an oscillator driven by both low- and high- frequency external signals is studied. It is shown that both two- and three-frequency resonances arise due to a nonlinear interaction of these harmonic forces. Conditions which must be met for oscillator synchronization under these resonances are estimated analytically by considering the Van der Pol oscillator with modulated natural frequency as mathematical model. Read More


A tree-dimensional transformation for a rotating coordinate system is found in application to the Dirac equation. The Pauli equation is extracted from the Dirac equation in this coordinate system always possesses an anomalous magnetic moment. In this interpretation, the g factor of the anomalous magnetic moment is equal to the constant in the 3D transformation for the rotating coordinate system. Read More


We consider in the paper axially-symmetric and stationary fields and cylindrically symmetric gravito-electromagnetic waves in the Nonsymmetric Kaluza-Klein Theory.Using symbollic manipulations we write down all important quantities in the theory. We write field equations for both cases and partially integrate them. Read More


Stochastic thermodynamics focuses on stochastic behavior of thermodynamic quantities. The concept of energy usually is pre-existent to a thermodynamic theory. We consider a class of general stochastic processes, with diffusion matrix $\epsilon D(x)$ and drift $b(x)$, $x\in\mathbb{R}^n$, which has a deterministic counterpart in the zero-noise limit ($\epsilon\to 0$). Read More


In this paper, we have explored the effects of dissipation on the dynamics of charged bulk viscous collapsing cylindrical source which allows the out follow of heat flux in the form of radiations. Misner-Sharp formulism has been implemented to drive the dynamical equation in term of proper time and radial derivatives. We have investigated the effects of charge and bulk viscosity on the dynamics of collapsing cylinder. Read More


This paper discusses a generalized model for compact stars, assumed to be anisotropic in nature due to the spherical symmetry and high density. After embedding the four-dimensional spacetime in a five-dimensional flat spacetime, which may be treated as an alternative to Karmarkar's condition of embedding class 1 spacetime, the Einstein field equations were solved by employing a class of physically acceptable metric functions proposed by Lake \cite{Lake2003}. The physical properties determined include the anisotropic factor showing that the anisotropy is zero at the center and maximal at the surface. Read More


Entanglement appears to be a fundamental building block of quantum gravity leading to new principles underlying the nature of quantum space-time. One such principle is the ER-EPR duality. While supported by our present intuition, a proof is far from obvious. Read More


It has been found that a model of extended electrons is more suited to describe theoretical simulations and experimental results obtained via scanning tunnelling microscopes, but while the dynamic properties are easily incorporated, magnetic properties, and in particular electron spin properties pose a problem due to their conceived isotropy in the absence of measurement. The spin of an electron reacts with a magnetic field and thus has the properties of a vector. However, electron spin is also isotropic, suggesting that it does not have the properties of a vector. Read More


The exact analytic solution of the Cauchy problem in unbounded space is obtained for the three-dimensional Euler-Helmholtz (EH) equation in the case of a nonzero-divergence velocity field. The solution obtained describes the inertial vortex motion of an ideal compressible medium and coincides with the exact solution to the three-dimensional Riemann-Hopf (RH) equation which simulates turbulence without pressure [Chefranov, 1991]. A necessary and sufficient condition of the onset of a singularity in the evolution of the enstrophy in finite time t=t_0 is obtained for this solution when its continuation is possible in times t>=t_0 in the Sobolev space H^0(R^3) but cannot be made in H^1(R^3). Read More


In the first part of this paper we present the Glashow-Salam-Weiberg model of the electroweak interactions. In the second part we present an alternative point of view which is based on the existence of the electrostatic energy of a homogeneously charged particle. In order to be generated massive leptons we multiply the Lagrangian -mtimes psibar timespsi by a factor which transform it into a gauge invariant term. Read More


This paper concerns the role of mass and angular momentum of massive vector and scalar particles to the Hawking temperature manifested under the effects of generalized uncertainty principle (GUP). In particular we calculate the Hawking temperature from a black hole in a warped DGP gravity model in the framework of quantum tunneling method. We use the modified Proca and Klein-Gordon equations previously recovered from the GUP lagrangian in the spacetime background of a warped DGP metric with the help of Hamilton-Jacobi (HJ) and semi-classical (WKB) approximation methods. Read More