Universal Journal of Physics Research

### Investigations on Hermitian and Skew-Hermitian SystemsSubmission Deadline: December 31, 2022

Dear colleagues,

In all applications of quantum mechanics in physics and chemistry, we ultimately want to understand things that we measure in the lab. The result of any measurement is always a real number. This means that we need to be sure that the procedures we develop for quantum calculations always [...] Read More

by Dr. Ilyas Haouam(ujpr2021@gmail.com)
December 3, 2021
Open Special Issue

### Journal profile

Universal Journal of Physics Research (UJPR) is an international peer-reviewed journal that publishes original and high-quality research papers in all areas of physics. Furthermore, it publishes reviews, short notes & reports, communications, perspectives, comments.

## Latest Articles

Open Access November 24, 2022 Endnote/Zotero/Mendeley (RIS) BibTeX

## Relativistic Radial Density Theory (RRDT)

Universal Journal of Physics Research 2022, 1(1), 77-87.

(This article belongs to the Special Issue Investigations on Hermitian and Skew-Hermitian
Systems
)

Abstract
Starting with Planck scale it is developed the Relativistic Radial Density Theory (RRDT). In this theory, the Planck and gravitational parameters can be described as the functions of the radial mass (energy) density value. This density is maximal at the minimal radius and minimal at the maximal radius. This conclusion
Article
Open Access November 8, 2022 Endnote/Zotero/Mendeley (RIS) BibTeX

## The c-equivalence principle and its implications for physics

Universal Journal of Physics Research 2022, 1(1), 63-76.

(This article belongs to the Special Issue Investigations on Hermitian and Skew-Hermitian
Systems
)

Abstract
The c-equivalence principle, commonly accepted as true by most physicists, is the unstated assumption that equals the kinematic speed of light. Should someone prove the principle false, it would render the composition of two Lorentz transformations meaningless. The second hypothesis of the Special Theory of Relativity in its strong
The c-equivalence principle, commonly accepted as true by most physicists, is the unstated assumption that equals the kinematic speed of light. Should someone prove the principle false, it would render the composition of two Lorentz transformations meaningless. The second hypothesis of the Special Theory of Relativity in its strong form would also be invalidated. This paper examined some of the consequences for physics, should this principle be proven false and outline some experiments to determine light speed, which could falsify the principle and provide evidence for the ether.Full article
Figures
Review Article
Open Access October 24, 2022 Endnote/Zotero/Mendeley (RIS) BibTeX

## Quantum Properties of Coherently Driven Three-Level Atom Coupled to Vacuum Reservoir

Universal Journal of Physics Research 2022, 1(1), 48-62.

(This article belongs to the Special Issue Investigations on Hermitian and Skew-Hermitian
Systems
)

Abstract
A three-level laser with an open cavity and a two-mode vacuum reservoir is explored for its quantum properties. Our investigation begins with a normalized order of the noise operators associated with the vacuum reservoir. The master equation and linear operators' equations of motion are used to determine the equations of
A three-level laser with an open cavity and a two-mode vacuum reservoir is explored for its quantum properties. Our investigation begins with a normalized order of the noise operators associated with the vacuum reservoir. The master equation and linear operators' equations of motion are used to determine the equations of evolution of the atomic operators' expectation values. The equation of motion answers are then used to calculate the mean photon number, photon number variance, and quadrature variance for single–mode cavity light and two–mode cavity light. As a result, for γ=0, the quadrature variance of light mode a is greater than the mean photon number for two-mode cavity light. As a result, for the two-mode cavity light, the maximum quadrature squeezing is 43.42 percent.Full article
Figures
Article
Open Access September 11, 2022 Endnote/Zotero/Mendeley (RIS) BibTeX

## Role of Skew-Symmetric Differential Forms in Mathematical Physics and Field Theory

Universal Journal of Physics Research 2022, 1(1), 32-47.

(This article belongs to the Special Issue Investigations on Hermitian and Skew-Hermitian
Systems
)

Abstract
Skew-symmetric differential forms possess properties that enable one to carry out a qualitative investigation of the equations of mathematical physics and the foundations of field theories. In the paper we call attention to a unique role in field theory of closed exterior skew-symmetric differential forms, which correspond to conservation laws
Skew-symmetric differential forms possess properties that enable one to carry out a qualitative investigation of the equations of mathematical physics and the foundations of field theories. In the paper we call attention to a unique role in field theory of closed exterior skew-symmetric differential forms, which correspond to conservation laws for physical fields (to conservative quantities). At the same time, it was shown that such closed exterior forms can be derived from skew-symmetric differential forms, which follow from the mathematical physics equations describing material media such as thermodynamic, gas-dynamic, cosmic media. This points a connection the field theory equations with the mathematical physics equations. Such connection discloses the properties and specific features of field theory.Full article
Article
Open Access June 20, 2022 Endnote/Zotero/Mendeley (RIS) BibTeX

## Charged Anisotropic Stellar Models with the MIT Bag Model Equation of State

Universal Journal of Physics Research 2022, 1(1), 18-31.

Abstract
In this paper we present a new classes of solutions for the Einstein-Maxwell system of field equations in a spherically symmetric spacetime under the influence of an electric field considering the MIT bag model equation of state with a particular form the metric potential that depends on an adjustable parameter.
In this paper we present a new classes of solutions for the Einstein-Maxwell system of field equations in a spherically symmetric spacetime under the influence of an electric field considering the MIT bag model equation of state with a particular form the metric potential that depends on an adjustable parameter. The obtained solutions can be written in terms of elementary functions, namely polynomials and algebraic functions. The obtained models satisfy all physical properties expected in a realistic star. The results of this research can be useful in the development and description of new models of compact structures.Full article
Figures
Article
Open Access June 20, 2022 Endnote/Zotero/Mendeley (RIS) BibTeX

## The Calculation of the Binding Energy of the Exciton Moving in a Two dimensional Semiconductor Quantum Well

Universal Journal of Physics Research 2022, 1(1), 13-17.

Abstract
With respect to the exciton moving in the two-dimensional quantum well, the paper presents a scheme which can rigorously calculate out the binding energy of the exciton in the two-dimensional semiconductor quantum well by simply using the relation $|{z}_{}$
With respect to the exciton moving in the two-dimensional quantum well, the paper presents a scheme which can rigorously calculate out the binding energy of the exciton in the two-dimensional semiconductor quantum well by simply using the relation $|{z}_{e}-{z}_{h}|=\rho \mathrm{tan}\alpha$, which is much simpler than the complex calculation of Ref.[1-2]. Concerning the calculation result eq.(13), the paper discusses the results for two significant cases of $|{z}_{e}-{z}_{h}|$<<$\rho$and $|{z}_{e}-{z}_{h}|\to \infty$.Full article
Editorial
Open Access June 16, 2022 Endnote/Zotero/Mendeley (RIS) BibTeX

## On Simultaneous Submission

Universal Journal of Physics Research 2022, 1(1), 11-12.

Abstract
The aim of this note is to remind and explain that authors have an obligation to make sure their manuscript is based on original research, which means it is never before published. Intentionally submitting or re-submitting a manuscript for more than publication is considered a violation of publishing ethics.
The aim of this note is to remind and explain that authors have an obligation to make sure their manuscript is based on original research, which means it is never before published. Intentionally submitting or re-submitting a manuscript for more than publication is considered a violation of publishing ethics.Full article
Editorial
Open Access November 5, 2021 Endnote/Zotero/Mendeley (RIS) BibTeX

## Compact Difference Schemes Combined with Runge-Kutta Methods for Solving Unsteady Convection-Diffusion

Universal Journal of Physics Research 2022, 1(1), 1-10.

Abstract
The convection-diffusion equation is of primary importance in understanding transport phenom-ena within a physical system. However, the currently available methods for solving unsteady convection-diffusion problems are generally not able to offer excellent accuracy in both time and space variables. A procedure was given in detail to solve the one-dimensional unsteady
The convection-diffusion equation is of primary importance in understanding transport phenom-ena within a physical system. However, the currently available methods for solving unsteady convection-diffusion problems are generally not able to offer excellent accuracy in both time and space variables. A procedure was given in detail to solve the one-dimensional unsteady convec-tion-diffusion equation through a combination of Runge-Kutta methods and compact difference schemes. The combination method has fourth-order accuracy in both time and space variables. Numerical experiments were conducted and the results were compared with those obtained by the Crank-Nicolson method in order to check the accuracy of the combination method. The anal-ysis results indicated that the combination method is numerically stable at low wave numbers and small CFL numbers. The combination method has higher accuracy than the Crank-Nicolson method.Full article
Figures
Article

#### Citations of

ISSN: 2834-5479
DOI prefix: 10.31586/ujpr
Journal metrics
Publication year
2021-2022