3 papers
astro-ph.CO2020
Screening anisotropy via energy-momentum squared gravity: CDM model with hidden anisotropy
Ozgur Akarsu, John D. Barrow, N. Merve Uzun
We construct a generalization of the standard CDM model, wherein we simultaneously replace the spatially flat Robertson-Walker metric with its simplest anisotropic generalizatio…
gr-qc2019
Screening in a new modified gravity model
Ozgur Akarsu, John D. Barrow, Charles V. R. Board +2
We study a new model of Energy-Momentum Squared Gravity (EMSG), called Energy-Momentum Log Gravity (EMLG), constructed by the addition of the term $f(T_{μν}T^{μν})=α\ln(λ\,T_{μν}T^…
gr-qc2018
Reduced phase space optics for general relativity: Symplectic ray bundle transfer
Nezihe Uzun
In the paraxial regime of Newtonian optics, propagation of an ensemble of rays is represented by a symplectic ABCD transfer matrix defined on a reduced phase space. Here, we presen…