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Amir M. Abbassi
local time: 2021-09-19 23:24 (+03:30 )
Amir M. Abbassi (Abstracts)
Titles Abstracts Details
  • Density-Metric Unimodular Gravity: Vacuum Spherical Symmetry (2008) [Updated 1 decade ago]
    by Amir M. Abbassi   read the paper:

    We analyze an alternative theory of gravity characterized by metrics that are tensor density of rank (0, 2) and weight −1 2 . The metric compatibility condition is supposed to hold. The simplest expression for the action of gravitational field is used. Taking the metric and trace of connections as dynamical variables, the field equations in the absence of matter and other kinds of sources are derived. The solutions of these equations are obtained for the case of vacuum static spherical symmetric spacetime. The null geodesics and advance of perihelion of ellipses are discussed. We confirm a subclass of solutions are regular for r > 0 and there is no event horizon while it is singular at r = 0.


  • Relational Relativity (2002) [Updated 1 decade ago]
    by Amir M. Abbassi   read the paper:

    According to a simple model of inertia a Machianized theory of special and general relativity is presented.


  • General Spherically Symmetric Solutions of Einstein Vacuum Field Equations With Lamba (2002) [Updated 8 years ago]
    by Amir M. Abbassi   read the paper:

    A one-parameter family of inequivalent non-static spacetimes for a point mass in the presence of cosmological constant are investigated.