32 citations · 191 across the 22 of their papers we have counts for
22 papers
Semiclassical Quadratic Gravity Revisited
Kostas Kleidis
The semiclassical interaction of the gravitational with a quantum scalar field is considered, in view of the renormalizability of the associated energy-momentum tensor in a n-dimen…
The dark energy as a natural property of cosmic polytropes -- A tutorial
Kostas Kleidis, Nikolaos K. Spyrou
Theoretical results on a conventional approach to the dark energy (DE) concept are reviewed and discussed. According to them, there is absolutely no need for a novel DE component i…
Gravitational versus magnetohydrodynamic waves in curved spacetime in the presence of large-scale magnetic fields
Kostas Kleidis, Apostolos Kuiroukidis, Demetrios B. Papadopoulos
The general-relativistic (GR) magnetohydrodynamic (MHD) equations for a conductive plasma fluid are derived and discussed in the curved spacetime described by Thorne's metric tenso…
Loop Quantum Cosmology Scalar Field Models
K. Kleidis, V. K. Oikonomou
In this work we use the Loop Quantum Cosmology modified scalar-tensor reconstruction techniques in order to investigate how bouncing and inflationary cosmologies can be realized. W…
Loop Quantum Cosmology Corrected Gauss-Bonnet Singular Cosmology
K. Kleidis, V. K. Oikonomou
In this work we investigate which Loop Quantum Cosmology corrected Gauss-Bonnet gravity can realize two singular cosmological scenarios, the intermediate inflation…
Cosmological perturbations in the CDM-like limit of a polytropic dark matter model
Kostas Kleidis, Nikolaos K. Spyrou
In a recent article, Kleidis and Spyrou (2015) proposed that both dark matter (DM) and dark energy (DE) can be treated as a single component, if accommodated in the context of a po…