3 papers
gr-qc2026
Quadratic effective energy--momentum tensor on uniform-density hypersurfaces during slow-roll inflation
Inyong Cho
We investigate the quadratic-order effective energy--momentum tensor (2EMT) of scalar cosmological perturbations on uniform-density hypersurfaces during slow-roll inflation. The 2E…
gr-qc2024
Cosmological scalar and tensor perturbations with a scalar field: quadratic-order effective energy-momentum tensor
Inyong Cho
We introduce the scalar and tensor modes of the gravitational perturbation in the presence of a scalar field which describes inflation. We investigate the back-reaction of the pert…
gr-qc2024
Homogeneous spacetime with shear viscosity
Inyong Cho, Rajibul Shaikh
We study the homogeneous and anisotropic evolution of Bianchi type-I spacetime driven by perfect fluid with shear viscosity. We obtain exact solutions by considering the simplest f…