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gr-qc2023
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…
gr-qc2023
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…
gr-qc2023
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…