10 papers · 1 filter
New Solutions for Evolution of the Scale Factor with a Variable Cosmological Term
Carlos Pinheiro, F. C. Khanna
The cosmological term is assumed to be a function of time such as where a(t) means the scale factor of standard cosmology. Analytical solutions for radiation dominated…
Quantum Gravity in D=5 Dimensions
Carlos Pinheiro, F. C. Khanna
We propose a topological Chern-Simons term in D=5 dimensions coupled to Einstein Hilbert theory. Hartree approximation for topological Lagrangian and the Chern-Simons term in D=3 i…
Some Comments on Wheeler De Witt Equation for Gravitational Collapse and the Problem of Time
Carlos Pinheiro, F. C. Khanna
We write the Hamiltonian for a gravitational spherically symmetric scalar field collapse with massive scalar field source, and we discuss the application of Wheeler De Witt equatio…
Non-Abelian Magnetic Monopoles in a Background of Gravitation with Fermions
Carlos Pinheiro, Cintia G. Pinheiro, F. C. Khanna
The purpose of this paper is to study static solution configuration which describes the magnetic monopoles in a scenary where the gravitation is coupled with Higgs, Yang-Mills and…
Analysis of Maxwell Equations in a Gravitational Field
Sortelano Araujo Diniz, Carlos Pinheiro, F. C. Khanna
In a gravitational field, we analyze the Maxwell equations, the correponding electromagnetic wave and continuity equations. A particular solution for parellel electric and magnetic…
Black Hole Entropy in 1+1 Dimensions from a Quasi-Chern Simons term in a Gravitational Background
Carlos Pinheiro, F. C. Khanna
We introduce a 'quasi-topological` term [1] in D=1+1 dimensions and the entropy for black holes is calculated [2]. The source of entropy in this case is justified by a non-null str…