Zobrazeno 1 - 10
of 123
pro vyhledávání: '"Ashfaque H. Bokhari"'
Autor:
Abu Bakr Mehmood, Fiaz Hussain, Ashfaque H. Bokhari, Muhammad Ramzan, Muhammad Faryad, Tahir Hussain
Publikováno v:
Results in Physics, Vol 39, Iss , Pp 105676- (2022)
We address the problem of finding non-static plane symmetric perfect fluid solutions in the f(R,T)theory of gravity, where R and T respectively are the Ricci scalar and trace of the energy momentum tensor. In order to obtain solutions, a classificati
Externí odkaz:
https://doaj.org/article/d61be496b1f64211aec886a23ebafc9e
Publikováno v:
Symmetry, Vol 15, Iss 5, p 1111 (2023)
In this paper, we use an algebraic approach to classify cylindrically symmetric static spacetimes according to their killing vector fields. This approach is based on using a maple algorithm to re-cast the Killing’s equations into a reduced involuti
Externí odkaz:
https://doaj.org/article/3bd0178e608d417487a0ac0ea2806977
Publikováno v:
Symmetry, Vol 15, Iss 4, p 933 (2023)
Symmetry is the most common and important principle of those which guide efforts to construct realistic theories in science [...]
Externí odkaz:
https://doaj.org/article/01820f998a2f40899c8306b1372ef7e3
Publikováno v:
Results in Physics, Vol 25, Iss , Pp 104299- (2021)
This paper deals with the study of homothetic vector fields of Bianchi type I spacetimes using Rif tree approach. Instead of directly integrating the homothetic symmetry equations, a computer algorithm is used to transform these equations to the redu
Externí odkaz:
https://doaj.org/article/750cd80853f3413fa0031b83c24ce846
Autor:
Bobomurat Ahmedov, Ashfaque H. Bokhari
Publikováno v:
Arabian Journal of Mathematics, Vol 8, Iss 4, Pp 255-257 (2019)
Externí odkaz:
https://doaj.org/article/28b13751be744e468c5f2dcaaae916a7
Publikováno v:
Arabian Journal of Mathematics, Vol 9, Iss 2, Pp 281-288 (2019)
Abstract The objective of this paper is to investigate the validity conditions for the generalized second law of thermodynamics, and the universal relations for multi-horizon dynamical spacetime. It is found that there are three horizons of McVittie
Externí odkaz:
https://doaj.org/article/326ad8afd6d84706932684565889f53f
Publikováno v:
Results in Physics, Vol 7, Iss , Pp 991-994 (2017)
Nonlinear evolution equations represent some of the most fundamental processes in both physics as well engineering. Considering this, we analyze and classify the three dimensional wave equation with a power law nonlinearity in presence of damping and
Externí odkaz:
https://doaj.org/article/fef4c8b8cd6a4d1cabdf0a0b9c5e59cf
Publikováno v:
Advances in Mathematical Physics, Vol 2017 (2017)
We carry out a classification of Lie symmetries for the (2+1)-dimensional nonlinear damped wave equation utt+fuut=div(gugrad u) with variable damping. Similarity reductions of the equation are performed using the admitted Lie symmetries of the equati
Externí odkaz:
https://doaj.org/article/808b0a81c7cc4527b6379b90a18b21be
Publikováno v:
Symmetry, Vol 10, Iss 12, p 712 (2018)
In this paper, we have investigated Noether symmetries of the Lagrangian of Kantowski⁻Sachs spacetime. The associated Lagrangian of the Kantowski⁻Sachs metric is used to derive the set of determining equations. Solving the determining equations f
Externí odkaz:
https://doaj.org/article/11fb47f88ab544a7bd53dd7c06e6e306
Publikováno v:
Abstract and Applied Analysis, Vol 2014 (2014)
The nonlinear fin equation in cylindrical coordinates is considered. Assuming a radial variable heat transfer coefficient and temperature dependent thermal conductivity, a complete classification of these two functions is obtained via Lie symmetry an
Externí odkaz:
https://doaj.org/article/cfbaa05b28b14957b07e8c7e54d43224