95 citations · 625 across the 35 of their papers we have counts for
35 papers
Noncoincidence -Cosmology with Dark Matter Coupled to Gravity
A. Abebe, P. S. Apostolopoulos, A. Giacomini +3
We investigate FLRW cosmology in the framework of symmetric teleparallel gravity with a nonminimal coupling between dark matter and the gravitational field. In the noncoinci…
Inhomogeneous brane models
Pantelis S. Apostolopoulos, Noeleen Naidoo
The existence of a set of Intrinsic Conformal Symmetries, which acts on three-dimensional hypersurfaces (spacelike or timelike), leads to the existence of two distinct familie…
Conformal Symmetries of the Strumia and Tetradis Metric
Pantelis S. Apostolopoulos, Christos Tsipogiannis
In a recent paper, a new conformally flat metric was introduced, describing an expanding scalar field in a spherically symmetric geometry. The spacetime can be interpreted as a Sch…
A class of 5D inhomogeneous models with a cosmological constant
Pantelis S. Apostolopoulos
In this work we would like to address the problem of the effect of bulk matter on the brane cosmological evolution in a general way. We assume that the spatial part of the brane me…
A positive cosmological constant as a geometrical artifact
Pantelis S. Apostolopoulos, Christos Tsipogiannis
We revisit the classical mechanism to produce dimensional spacetimes via Kaluza-Klein compactification. We made the assumption that the dimensional bulk geo…
Constructing a family of conformally flat scalar field models
Pantelis S. Apostolopoulos
Using purely geometrical methods we present a mechanism to solve the scalar field equations of motion (non-minimally coupled with gravity) in a spherically symmetric background. We…