95 citations · 634 across the 27 of their papers we have counts for
4 papers · 1 filter
Gravity Effects on the Kinetic Axion Phase Space
V. K. Oikonomou
In this work we consider the effect of an term on the kinetic misalignment axion theory. By using the slow-roll assumptions during inflation and the field equations, we const…
Dissimilar Donuts in the Sky? Effects of a Pressure Singularity on the Circular Photon Orbits and Shadow of a Cosmological Black Hole
S. D. Odintsov, V. K. Oikonomou
The black hole observations obtained so far indicate one thing: similar "donuts" exist in the sky. But what if some of the observed black hole shadows that will obtained in the fut…
Bottom-Up Reconstruction of Viable GW170817 Compatible Einstein-Gauss-Bonnet Theories
V. K. Oikonomou, P. D. Katzanis, Ilias C. Papadimitriou
In this work we shall use a bottom-up approach for obtaining viable inflationary Einstein-Gauss-Bonnet models which are also compatible with the GW170817 event. Specifically, we sh…
Did the Universe Experienced a Pressure non-Crushing Type Cosmological Singularity in the Recent Past?
S. D. Odintsov, V. K. Oikonomou
In the recent literature it has been shown that the tension may be eliminated if an abrupt physics transition changed the Cepheid parameters in the near past of the Universe,…