output
19962026
most citedPseudo-Hermiticity versus PT Symmetry: The necessary condition for the reality of the spectrum of a non-Hermitian Hamiltonian

1.7k citations

Showing 2011 · gr-qcShow all

5 papers · 2 filters

gr-qc2011★ 20 cited

Bianchi type II models in the presence of perfect fluid and anisotropic dark energy

Suresh Kumar, Ozgur Akarsu

Spatially homogeneous but totally anisotropic and non-flat Bianchi type II cosmological model has been studied in general relativity in the presence of two minimally interacting fl…

gr-qc2011★ 24 cited

Non-minimal -Coupled Electromagnetic Fields to Gravity and Static, Spherically Symmetric Solutions

Tekin Dereli, Özcan Sert

We investigate non-minimal -type couplings of electromagnetic fields to gravity. We derive the field equations by a first order variational principle using the method of La…

gr-qc2011★ 55 cited

Non-minimal Couplings of Electromagnetic Fields to Gravity: Static, Spherically Symmetric Solutions

Tekin Dereli, Özcan Sert

We investigate the non-minimal couplings between the electromagnetic fields and gravity through the natural logarithm of the curvature scalar. After we give the Lagrangian formulat…

gr-qc2011★ 198 cited

Cosmological models with linearly varying deceleration parameter

Ozgur Akarsu, Tekin Dereli

We propose a new law for the deceleration parameter that varies linearly with time and covers Berman's law where it is constant. Our law not only allows one to generalize many exac…

gr-qc2011★ 36 cited

Non-minimally Coupled Gravitational and Electromagnetic Fields: pp-Wave Solutions

T. Dereli, O. Sert

We give the Lagrangian formulation of a generic non-minimally extended Einstein-Maxwell theory with an action that is linear in the curvature and quadratic in the electromagnetic f…