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Dive into the research topics where Ali Havare is active.

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Featured researches published by Ali Havare.


International Journal of Modern Physics A | 2005

ENERGY–MOMENTUM IN VISCOUS KASNER-TYPE UNIVERSE IN BERGMANN–THOMSON FORMULATIONS

Mustafa Salti; Ali Havare

Using the Bergmann–Thomson energy–momentum complex and its tele-parallel gravity version, we obtain the energy and momentum of the universe in viscous Kasner-type cosmological models. The energy and momentum components (due to matter plus field) are found to be zero and this agree with a previous work of Rosen and Johri et al. who investigated the problem of the energy in Friedmann–Robertson–Walker universe. The result that the total energy and momentum components of the universe in these models is zero supports the viewpoint of Tryon. Rosen found that the energy of the Friedmann–Robertson–Walker space–time is zero, which agrees with the studies of Tryon.


arXiv: General Relativity and Quantum Cosmology | 2005

Relative Energy-Momentum of the Bianchi-I Type Universes in Teleparallel Gravity

Mustafa Salti; Ali Havare

This paper has been removed by arXiv administrators because it plagiarizes gr-qc/0011027, gr-qc/0205028, and gr-qc/0303034.Using the teleparallel gravity versions of the Einstein and Landau–Lifshitz’s energy and/or momentum complexes, I obtain the energy and momentum of the universe in viscous Kasner-type cosmological models. The energy and momentum components (due to matter plus field) are found to be zero and this agree with a previous work of Rosen and Johri et al., who investigated the problem of the energy in Friedmann–Robertson–Walker (FRW) universe. The result that the total energy and momentum components of the universe in these models is zero same as Bergmann–Thomson’s energy–momentum and props the viewpoint of Tryon. Rosen found that the energy of the FRW space–time is zero, which agrees with the studies of Tryon.


Journal of Physics A | 2010

Scattering of vector bosons by an asymmetric Hulthen potential

K. Sogut; Ali Havare

Exact solutions for the bound and scattering states of the spatially one-dimensional Duffin–Kemmer–Petiau equation for an asymmetric Hulthen potential are obtained in terms of the hypergeometric functions. These solutions are used to derive conditions for the existence of the transmission resonances. From this investigation, we show how the transmission coefficient depends on the energy of the particle and the strength of the potential barrier.


Physica Scripta | 2010

Transmission resonances in the Duffin–Kemmer–Petiau equation in (1+1) dimensions for an asymmetric cusp potential

K. Sogut; Ali Havare

The dynamics of the spin-1 particle is studied using the Duffin–Kemmer–Petiau (DKP) equation. In this study, we exactly solve the one-space-dimensional DKP equation for the general form of a cusp potential. We obtain bound and scattering states and, using these solutions, investigate the condition for the existence of supercriticality and transmission resonances. In contrast to the results suggested in previous studies for a spin-1/2 particle moving in a same-type cusp potential, the results presented here demonstrate that the transmission resonance phenomenon for a spin-1 particle occurs not only for the symmetric but also for the asymmetric form of the cusp potential. The dependence of the transmission coefficient on the potential shape parameters and potential barrier strength is also analyzed.


Classical and Quantum Gravity | 2006

Spin-1 particle in an electrical field in (1 + 1)-dimensional Schrödinger spacetime

K. Sogut; Ali Havare

In this paper exact solutions of the Duffin–Kemmer–Petiau (DKP) equation are obtained for a two-dimensional curved spacetime plus a constant electric field. Based on the solutions we discuss the current density of a spin-1 particle by considering the Gordon decomposition of the current. We also investigate the harmonic oscillator behaviour of vector bosons and their quantized momentum spectra for this cosmology.


Advances in High Energy Physics | 2014

Scattering and Bound States of Duffin-Kemmer-Petiau Particles for -Parameter Hyperbolic Pöschl-Teller Potential

Hilmi Yanar; Ali Havare; K. Sogut

The Duffin-Kemmer-Petiau (DKP) equation in the presence of a scalar potential is solved in one spatial dimension for the vector -parameter Hyperbolic Poschl-Teller (HPT) potential. In obtaining complete solutions we used the weak interaction approach and took the scalar and vector potentials in a correlated form. By looking at the asymptotic behaviors of the solutions, we identify the bound and scattering states. We calculate transmission () and reflection () probability densities and analyze their dependence on the potential shape parameters. Also we investigate the dependence of energy eigenvalues of the bound states on the potential shape parameters.


Journal of Mathematical Physics | 2002

Energy levels and wave functions of vector bosons in a homogeneous magnetic field

K. Sogut; Ali Havare; I. Acikgoz

We aimed to obtain the energy levels of spin-1 particles moving in a constant magnetic field. The method used here is completely algebraic. In the process to obtain the energy levels the wave function is choosen in terms of Laguerre Polynomials.We aimed to obtain the energy levels of massive spin-1 particles moving in a constant magnetic field. The method used here is completely algebraic. In the process to obtain the energy levels the wave function is expressed in terms of Laguerre polynomials.


Nuclear Physics | 2004

Creation of spin-1/2 particles in de Sitter space–time

Ali Havare; Taylan Yetkin; Murat Korunur; K. Sogut

Abstract In this work we analyzed the particle creation process of spin-1/2 particles by considering a simple cosmological model, a two-dimensional de Sitter space–time. We choose two different charts, the static and global chart, on de Sitter space–time. We solved the Dirac equation for these two charts and then used Bogoliubov coefficients to relate vacuum states in the asymptotic regions of gravitational backgrounds. By using the Bogoliubov transformation technique we compute the density of particles created.


Advances in High Energy Physics | 2015

Spin and Pseudospin Symmetry in Generalized Manning-Rosen Potential

Hilmi Yanar; Ali Havare

Spin and pseudospin symmetric Dirac spinors and energy relations are obtained by solving the Dirac equation with centrifugal term for a new suggested generalized Manning-Rosen potential which includes the potentials describing the nuclear and molecular structures. To solve the Dirac equation the Nikiforov-Uvarov method is used and also applied the Pekeris approximation to the centrifugal term. Energy eigenvalues for bound states are found numerically in the case of spin and pseudospin symmetry. Besides, the data attained in the present study are compared with the results obtained in the previous studies and it is seen that our data are consistent with the earlier ones.


Advances in High Energy Physics | 2014

Dirac Particle for the Position Dependent Mass in the Generalized Asymmetric Woods-Saxon Potential

Soner Alpdoğan; Ali Havare

The one-dimensional Dirac equation with position dependent mass in the generalized asymmetric Woods-Saxon potential is solved in terms of the hypergeometric functions. The transmission and reflection coefficients are obtained by considering the one-dimensional electric current density for the Dirac particle and the equation describing the bound states is found by utilizing the continuity conditions of the obtained wave function. Also, by using the generalized asymmetric Woods-Saxon potential solutions, the scattering states are found out without making calculation for the Woods-Saxon, Hulthen, cusp potentials, and so forth, which are derived from the generalized asymmetric Woods-Saxon potential and the conditions describing transmission resonances and supercriticality are achieved. At the same time, the data obtained in this work are compared with the results achieved in earlier studies and are observed to be consistent.

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