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Mohd. Zeyauddin

Publications and source records attributed to Mohd. Zeyauddin.

4 recordsLinked to original sources

The BIonic diode in a system of trigonal manifolds

A BIonic diode is constructed of two polygonal manifolds connected by a Chern-Simons manifold. The shape and the angle between atoms of molecules on the boundary of two polygonal manifolds are completely different. For this reason, electrons on the Chern-Simons manifold are repelled by molecules at the boundary of one manifold and absorbed by molecules on the boundary of another manifold. The attractive and repulsive forces between electrons are carried by masive photons. For example, when two non-similar trigonal manifolds join to each other, one non-symmetrical hexagonal manifold is emerged and the exchanged photons form Chern-Simons fields which live on a Chern-Simons manifold in a BIon. While, for a hexagonal manifold, with similar trigonal manifolds, the photons exchanged between two trigonal manifolds cancel the effect of each other and BIonic energy becomes zero. Also, exchanging photons between heptagonal and pentagonal manifolds lead to the motion of electrons on the Chern-Simons manifold and formation of BIonic diode. The mass of photons depend on the shape of molecules on the boundary of manifolds and the length of BIon in a gap between two manifolds.

physics.gen-ph

An exact Bianchi V cosmological model in Scale Covariant theory of gravitation: A variable deceleration parameter study

A spatially homogeneous and anisotropic Bianchi type V cosmological model of the universe for perfect fluid within the framework of Scale covariant theory of gravitation proposed by Canuto et al., is studied in view of a variable deceleration parameter which yields the average scale factor $a=sinh^{(1/n)}(βt)$ where $β$ and $n$ are constants. The solution represents a singular model of the universe. All physical and geometrical properties of the model are thoroughly studied. The time dependent deceleration parameter supports the recent observation. The model represents an accelerating phase for $0 1$, there is a phase transition from early deceleration to a present accelerating phase.

physics.gen-ph

Bianchi type V bulk viscous cosmological models with particle creation in General Relativity

In this paper, a spatially homogeneous and anisotropic Bianchi type V model filled with an imperfect fluid with bulk viscosity and particle creation, is investigated within the framework of General Relativity. Particle creation and bulk viscosity have been considered as separate irreversible processes. The energy- momentum tensor is modified to accommodate the viscous pressure and creation pressure which is associated with creation of matter out of gravitational field. Exact solutions of the field equations are obtained by applying a special law of variation of Hubble parameter. Using this assumption, we obtain two types of cosmological models. We find a singularity in the first model whereas second model is non-singular. Further we separately study the bulk viscosity and particle creation in each model considering four different cases. The bulk viscosity coefficient $ζ$ is obtained for Truncated, Full Causal and Eckart theories in all cases. All physical parameters are calculated and thoroughly discussed in both models.

gr-qc

Bianchi type VI cosmological models: A Scale-Covariant study

A model for an anisotropic Bianchi type VI universe in a Scale Covariant theory of gravitation (Canuto et al. 1977) is analyzed. A finite singularity is found in the model at the initial time $t=0$. All the physical parameters are studied and thoroughly discussed. The model behaves like a big bang singular model of the universe. This universe model is found to be consistent with the observations on the present day universe.

gr-qc