Showing papers in "Canadian Journal of Physics in 2017"
TL;DR: There are some gravitational theories in which the ordinary energymomentum conservation law is not valid in the curved space-time as discussed by the authors, and Rastall gravity is one of them.
Abstract: There are some gravitational theories in which the ordinary energy–momentum conservation law is not valid in the curved space–time. Rastall gravity is one of the known theories in this regard, whic...
94 citations
TL;DR: The Reissner-Nordstrom black hole solution in a generic cosmological constant background in the context of Rastall gravity was obtained in this paper, where it was shown that it arises naturally f...
Abstract: The Reissner–Nordstrom black hole solution in a generic cosmological constant background in the context of Rastall gravity is obtained. It is shown that the cosmological constant arises naturally f...
68 citations
TL;DR: In this article, the characteristics of the "black hole shadow" for a rotating, neutral black hole in fourth-order conformal Weyl gravity were calculated, and it was shown that the morphology is not significantly affected.
Abstract: We calculate the characteristics of the “black hole shadow” for a rotating, neutral black hole in fourth-order conformal Weyl gravity. It is shown that the morphology is not significantly affected ...
49 citations
TL;DR: In this paper, the interaction of SO2 molecule onto boron phosphide and Ni-decorated B12P12 nanoclusters using density functional theory (DFT) was investigated.
Abstract: In this study, we have researched the interaction of SO2 molecule onto boron phosphide (B12P12) and Ni-decorated B12P12 nanoclusters using density functional theory (DFT). While SO2 has weak physis...
44 citations
TL;DR: The effective atomic numbers and electron densities for the pure elemental forms of gadolinium (Gd), dysprosium (Dy), erbium (Er), and ytterbium(Yb), and some of their selected complexes, were obt...
Abstract: The effective atomic numbers and electron densities for the pure elemental forms of gadolinium (Gd), dysprosium (Dy), erbium (Er), and ytterbium (Yb), and some of their selected complexes, were obt...
41 citations
TL;DR: In this article, the authors present a progress report on including all the lines in the line lists, including all line lists in the opacities, and including all lines in model atmosphere and spectrum synthesis calculi...
Abstract: I present a progress report on including all the lines in the line lists, including all the lines in the opacities, and including all the lines in the model atmosphere and spectrum synthesis calcul...
39 citations
TL;DR: In this paper, Bianchi type-VI0 space-time filled with anisotropic modified holographic Ricci dark energy in a scalar-tensor theory proposed by Brans-Dicke (Phys. Rev. 124, 925 (1961)) was considered.
Abstract: In this paper, we consider Bianchi type-VI0 space–time filled with anisotropic modified holographic Ricci dark energy in a scalar–tensor theory proposed by Brans–Dicke (Phys. Rev. 124, 925 (1961))....
37 citations
TL;DR: In this article, the authors considered spatially homogeneous and anisotropic Bianchi type-III space-time filled with matter and modified holographic Ricci dark energy in general relativity.
Abstract: In this paper, we have considered spatially homogeneous and anisotropic Bianchi type-III space–time filled with matter and anisotropic modified holographic Ricci dark energy in general relativity. ...
32 citations
TL;DR: In this paper, the analysis of thermodynamic irreversibility generation and the natural convection in inclined partially porous layered cavity filled with a Cu-water nanofromide was performed.
Abstract: The present numerical study investigates the analysis of thermodynamic irreversibility generation and the natural convection in inclined partially porous layered cavity filled with a Cu–water nanof...
31 citations
TL;DR: In this article, a solution of the quantum mechanics problem of the allowable energy levels of a bound particle in a one-dimensional finite square well is presented, which is a geometric-analytic technique utilizing the conformal mapping w → z = wew between two complex domains.
Abstract: We present a solution of the quantum mechanics problem of the allowable energy levels of a bound particle in a one-dimensional finite square well. The method is a geometric-analytic technique utilizing the conformal mapping w → z = wew between two complex domains. The solution of the finite square well problem can be seen to be described by the images of simple geometric shapes, lines, and circles, under this map and its inverse image. The technique can also be described using the Lambert W function. One can work in either of the complex domains, thereby obtaining additional insight into the finite square well problem and its bound energy states. This suggests interesting possibilities for the design of materials that are sensitive to minute changes in their environment such as nanostructures and the quantum well infrared photodetector.
30 citations
TL;DR: The changes in molecular chemical structure of polyvinyl alcohol (PVA) and pyrrolidone (PVP) caused by doping PVA with cadmium chloride (CdCl2) have been studied using ultravi... as mentioned in this paper.
Abstract: The changes in molecular chemical structure of polyvinyl alcohol (PVA) and polyvinyl pyrrolidone (PVP), caused by doping PVA–PVP blend with cadmium chloride (CdCl2), have been studied using ultravi...
TL;DR: In this article, the authors studied wormholes solutions based on fractional action cosmology and derived wormholes wave function in a closed Friedmann-Robertson-Walker (FRW) universe and found that a wormhole can survive in the presence of quantum effects only if the expansion of the universe is accelerated with time.
Abstract: In this work we study wormholes solutions based on fractional action cosmology. We discuss cosmic dynamics of the universe in the presence of wormhole and wormhole wave function in closed Friedmann–Robertson–Walker (FRW) universe. We have observed that cosmic acceleration with traversable wormhole may be realized without the need of exotic matter like dark and phantom energy unless the scale factor of the universe obeys a power law dominated by a negative fractional parameter, which is constrained from type Ia supernovae data. Besides, we have derived wormholes wave function in a closed FRW universe and we have found that a wormhole can survive in the presence of quantum effects only if the expansion of the universe is accelerated with time.
TL;DR: In this paper, the velocity function and time-dependent shear stress of a fractional Maxwell fluid with fractional derivatives are calculated and the flow of the fractional fluid is discussed.
Abstract: In this work, the flow of a fractional Maxwell fluid is discussed. The velocity function and time-dependent shear stress of a Maxwell fluid with fractional derivatives are calculated. It is conside...
TL;DR: In this paper, the Friedmann equations in the framework of teleparallel gravity by vierbein field were obtained in the model of interaction between f(T, T ) gravity and modified Chaplygin gas in Friedmann-Robertson-Walker (FRW)-flat metric.
Abstract: In this paper, the model of interaction is studied between f(T, T ) gravity and modified Chaplygin gas in Friedmann–Robertson–Walker (FRW)-flat metric. We obtain the Friedmann equations in the framework of teleparallel gravity by vierbein field. We consider that the Universe is dominated by components of cold matter, dark energy, and modified Chaplygin gas. In what follows we separately write the corresponding continuity equations for components of the Universe. Also, dark energy equation of state (EoS) and effective EoS are obtained with respect to redshift, thereinafter the corresponding cosmological parameters are plotted in terms of redshift, thereinafter the accelerated expansion of the Universe is investigated. Finally, the stability of the model is discussed in phase plane analysis.
TL;DR: In this article, numerical solutions for the periodic laminar boundary layer mixed convection flow around the surface of a heated sphere in the presence of viscous dissipation have been obtained by solving the gove...
Abstract: Numerical solutions for the periodic laminar boundary layer mixed convection flow around the surface of a heated sphere in the presence of viscous dissipation have been obtained by solving the gove...
TL;DR: In this article, the authors investigated the anisotropic Kantowski-Sachs model in the f(R, T) theory of gravity with scalar field (quintessence or phantom).
Abstract: In this paper, we investigate the anisotropic Kantowski–Sachs model in the f(R, T) theory of gravity proposed by Harko et al. (Phys. Rev. D, 84, 024020, 2011) with scalar field (quintessence or phantom). Here R is the Ricci scalar and T is the trace of the energy–momentum tensor. The field equations have been solved using the fact that scalar expansion is proportional to the shear scalar of the space–time. We explore the behavior of the deceleration parameter, which represents a transition of the universe from the early decelerating phase to the present accelerated phase. Some physical properties and various cosmological distance measures are also obtained and discussed.
TL;DR: In this article, the relativistic quantum structure of electromagnetic wave propagation of dyons was investigated, and the generalized continuity equations for massive dyons in case of quantum fields were expressed.
Abstract: Beginning with the quaternionic generalization of the quantum wave equation, we construct a simple model of relativistic quantum electrodynamics for massive dyons. A new quaternionic form of unified relativistic wave equation consisting of vector and scalar functions is obtained, and also satisfy the quaternionic momentum eigenvalue equation. Keeping in mind the importance of quantum field theory, we investigate the relativistic quantum structure of electromagnetic wave propagation of dyons. The present quantum theory of electromagnetism leads to generalized Lorentz gauge conditions for the electric and magnetic charge of dyons. We also demonstrate the universal quantum wave equations for two four-potentials as well as two four-currents of dyons. The generalized continuity equations for massive dyons in case of quantum fields are expressed. Furthermore, we concluded that the quantum generalization of electromagnetic field equations of dyons can be related to analogous London field equations (i.e., current...
TL;DR: In this paper, the authors focused on the study of the atomic structure and the determination of radiative parameters in neutral and slightly ionized heavy atoms (Z ≥ 37) and showed that the structure and radiative properties of heavy atoms can be determined from the atomic geometry.
Abstract: During the past 20 years, part of our work has been focused on the study of the atomic structure and the determination of radiative parameters in neutral and slightly ionized heavy atoms (Z ≥ 37). ...
TL;DR: In this article, a mode-matching analysis articulates the coupled wave scattering in a 2D waveguide structure, where an elastic plate is attached at the upper surface parallel to the axis of inlet-outlet ducts whereas a flanged junction is introduced between two flexible waveguides.
Abstract: A mode-matching analysis articulates the coupled wave scattering in a 2D waveguide structure. An elastic plate is attached at the upper surface parallel to the axis of inlet–outlet ducts whereas a flanged junction is introduced between two flexible waveguides. The main intention is to see how choice of appropriate edge conditions and the incident forcing affect the scattered field for both structure-borne and fluid-borne vibrations. The graphical results illustrate that different physical conclusions should be drawn. Through apposite numerical results, we observe the power distributions in attenuated regions with abrupt changes of height. Such configurations are directly relevant to the models of fluid and structural interactions.
TL;DR: The widely publicized GW150914 event was recently detected by the LIGO Scientific Collaboration as mentioned in this paper as confirmation of gravitational waves (GWs) predicted by Albert Einstein in his gene...
Abstract: The widely publicized “GW150914 event” that was recently detected by the LIGO Scientific Collaboration is given as confirmation of gravitational waves (GWs) predicted by Albert Einstein in his gene...
TL;DR: In this paper, the impact of nonlinear magnetic field, nonlinear thermal radiation, variable thickness, and Brownian motion on flow and heat transfer characteristics (i.e., skin friction and surface heat flux) as a physical application is explored.
Abstract: A numerical investigation has been done to study the impact of nonlinear magnetic field, nonlinear thermal radiation, variable thickness, and Brownian motion on flow and heat transfer characteristics (i.e., skin friction and surface heat flux) as a physical application. Moreover, the impact of these forces on the rate of cooling and the mechanical properties (i.e., hardness, ductility, …) of a surface that is cooled using nanofluid as a coolant is explored. The governing boundary layer equations describing the problem are transformed to ordinary differential equations using the similarity transformation method and are then solved numerically using the fourth-order Runge–Kutta method with shooting technique with the assistance of Mathematica program.
TL;DR: In this article, the bound state solution of the Feynman propagator with the deformed generalized Schioberg potential was determined using an approximation of the centrifugal term, and the energy eigenvalue expression was derived.
Abstract: The bound state solution of the Feynman propagator with the deformed generalized Schioberg potential is determined using an approximation of the centrifugal term. The energy eigenvalue expression i...
TL;DR: In this article, the steady unidirectional flow of an isothermal, incompressible, magneto-micropolar hydrodynamic fluid in an infinitely magnetic insulating circular cylinder is considered.
Abstract: The steady unidirectional flow of an isothermal, incompressible, magneto-micropolar hydrodynamic fluid in an infinitely magnetic insulating circular cylinder is considered. The fluid is under a constant magnetic field perpendicular to the axis of the cylinder. The slip boundary conditions for velocity and microrotation are applied. Closed forms for the velocity, microrotation, and magnetic field are obtained for Poiseuille and Couette flows. Expressions for the rate of flow and skin coefficients are calculated. Variations of the physical quantities with respect to micropolarity parameter, slip parameters, and Hartman number are studied and their variations are illustrated graphically. Similar results are obtained for electro- micropolar fluids.
TL;DR: In this article, the authors investigated the heat conduction behavior of a bi-layered circular plate during pulsed laser heating, where a laser pulse with non-Gaussian temporal form was applied to the center of the top surface of the plate at the beginning of time.
Abstract: In this study, the heat conduction behavior of a bi-layered circular plate during pulsed laser heating is investigated. A laser pulse with non-Gaussian temporal form is applied to the center of the top surface of the plate at the beginning of time. The spatial distribution of the heat energy of the laser pulse is also considered. The Green’s function for heat conduction equation of two-dimensional laminated structure is determined and is used to derive the analytical expression of temperature increment of the problem. The validation of this theoretical model is obtained through comparison with numerical results obtained by the ANSYS software package. The spatial and temporal variations of the temperature increment are illustrated. The influence of the duration time of the laser pulse on the temperature increment is also analyzed.
TL;DR: In this paper, a spinless relativistic particle depicted by the Klein-Gordon equation in the spinning cosmic string space-time is analyzed, and the energy spectrum and corresponding wave functions of these systems are obtained by using the functional analysis method.
Abstract: In this paper we analyze a spinless relativistic particle depicted by the Klein–Gordon equation in the spinning cosmic string space–time. The solutions of the Klein–Gordon equation in the presence of a uniform magnetic field and the Klein–Gordon equation with two common cylindrically symmetric scalar potentials under the background space–time are presented; the energy spectrum and the corresponding wave functions of these systems are obtained by using the functional analysis method. It is shown that the energy levels of the considered physical systems depend explicitly on the angular deficit α and the rotational parameter a, which characterize the global structure of the metric in the space–time of the spinning cosmic string.
TL;DR: In this article, the properties of (d − 1)-dimensional s-wave holographic superconductor in the presence of Power-Maxwell field were investigated and the probe limit in which the scalar and gauge fields do not backre...
Abstract: The properties of (d–1)-dimensional s-wave holographic superconductor in the presence of Power–Maxwell field is explored. We study the probe limit in which the scalar and gauge fields do not backre...
TL;DR: In this paper, the authors investigated Bianchi type-V universe filled with matter and modified holographic Ricci dark energy in a scalar-tensor theory proposed by Saez-Ballester.
Abstract: We have investigated Bianchi type-V universe filled with matter and modified holographic Ricci dark energy in a scalar–tensor theory proposed by Saez–Ballester (Phys. Lett. A, 113, 467 (1986)). To get a determinate solution, we have used (i) hybrid expansion law (Akarsu et al. JCAP, 01, 022 (2014)), (ii) varying deceleration parameter (Mishra et al. Int. J. Theor. Phys. 52, 2546 (2013)), and (iii) linearly varying deceleration parameter (Akarsu and Dereli. Int. J. Theor. Phys. 51, 612 (2012)). The various physical and geometrical aspects of the models are also discussed.
TL;DR: In this paper, the center of mass (CM) energy of head-on colliding particles moving in opposite radial directions near the naked singularity/horizon near the event horizon is considered.
Abstract: Particle collisions are considered within the context of f(R) gravity described by f(R)=R+2\alpha\sqrt{R}, where R stands for the Ricci scalar and \alpha is a non-zero constant. The center of mass (CM) energy of head-on colliding particles moving in opposite radial directions near the naked singularity/horizon are considered. Collision of particles in the same direction near the event horizon yields finite energy while the energy of oppositely moving particles grows unbounded. Addition of a cosmological constant does not change the feature. Collision of a massless outgoing photon with an infalling particle and collision of two oppositely moving photons following null-geodesics are also taken into account.
TL;DR: In this paper, the problem of a two-dimensional DKP oscillator in the presence of a Coulomb potential in the cosmic string background is solved, and the eigensolutions of the pro...
Abstract: In this paper, the problem of a two-dimensional Duffin–Kemmer–Petiau (DKP) oscillator in the presence of a Coulomb potential in the cosmic string background is solved. The eigensolutions of the pro...
TL;DR: In this article, the authors studied the thermoelastic properties of an isotropic and homogeneous one-dimensional semi-infinite elastic medium subjected to a laser short-pulse heating with time exponentially decaying.
Abstract: In this work, we study the thermoelastic properties of an isotropic and homogeneous one-dimensional semi-infinite elastic medium subjected to a laser short-pulse heating with time exponentially dec...