160 citations · 334 across the 18 of their papers we have counts for
18 papers
Hints for a gravitational constant transition in Tully-Fisher data
George Alestas, Ioannis Antoniou, Leandros Perivolaropoulos
We use an up to date compilation of Tully-Fisher data to search for transitions in the evolution of the Tully-Fisher relation. Using an up to date data compilation, we find hints a…
Black hole or Gravastar? The GW190521 case
Ioannis Antoniou
The existence of cosmological compact objects with very strong gravity is a prediction of General Relativity and an exact solution of the Einstein equations. These objects are call…
Spinning particle orbits around a black hole in an expanding background
I. Antoniou, D. Papadopoulos, L. Perivolaropoulos
We investigate analytically and numerically the orbits of spinning particles around black holes in the post Newtonian limit and in the presence of cosmic expansion. We show that or…
Constraints on Spatially Oscillating Sub-mm Forces from the Stanford Levitated Microsphere Experiment Data
Ioannis Antoniou, Leandros Perivolaropoulos
A recent analysis by one of the authors\cite{Perivolaropoulos:2016ucs} has indicated the presence of a signal of spatially oscillating new force residuals in the torsion balan…
Propagation of gravitational waves in an expanding background in the presence of a point mass
I. Antoniou, D. Papadopoulos, L. Perivolaropoulos
We solve the Laplace equation describing the propagation of gravitational waves in an expanding background metric with a power law scale factor in the presence of a…
Geodesics of McVittie Spacetime with a Phantom Cosmological Background
Ioannis Antoniou, Leandros Perivolaropoulos
We investigate the geodesics of a Schwarzschild spacetime embedded in an isotropic expanding cosmological background (McVittie metric). We focus on bound particle geodesics in a ba…