5 citations · 5 across the 4 of their papers we have counts for
4 papers
The friction-era VOS amplitude of a string network from nematic disclination data
Dimitrios Efstratiou, Evangelos Achilleas Paraskevas, Leandros Perivolaropoulos
A tangle of line defects coarsens as the mean spacing between neighbouring lines grows. In a viscous medium the motion is overdamped, and the velocity-dependent one-scale (VOS)…
Static Dark Fluid Thin Shells in Schwarzschild-de Sitter Spacetimes: Stability and Black Hole Shadows
Dimitrios Efstratiou, Evangelos Achilleas Paraskevas, Leandros Perivolaropoulos
We study the existence and radial stability of static, spherically symmetric thin shells joining two Schwarzschild-de Sitter (SdS) spacetimes . Near the equilibrium…
Addressing the DESI DR2 Phantom-Crossing Anomaly and Enhanced Tension with Reconstructed Scalar-Tensor Gravity
Dimitrios Efstratiou, Evangelos Achilleas Paraskevas, Leandros Perivolaropoulos
Recent cosmological data, including DESI DR2, highlight significant tensions within the CDM paradigm. When analyzed in the context of General Relativity (GR), the latest DESI da…
Metastable Cosmological Constant and Gravitational Bubbles: Ultra-Late-Time Transitions in Modified Gravity
Dimitrios Efstratiou, Leandros Perivolaropoulos
The observed cosmological constant may originate as the minimum value of a scalar field potential, where the scalar field is frozen due to a large mass. If this vacuum is…