3 citations · 3 across the 3 of their papers we have counts for
21 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)…
Cosmographic Reconstruction of the Quintessence Potential in Scalar-Tensor Gravity
G. Antonopoulos, L. Perivolaropoulos
We generalise the cosmographic reconstruction programme of Chakraborty, Dunsby & Scherrer to scalar-tensor gravity. Working in the Jordan frame with a general non-minimal coupling…
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 . Using the Israel ju…
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 d…
A Friendly Phantom: Late-time AdS-to-dS transition and cosmological tensions
Ãzgür Akarsu, Leandros Perivolaropoulos, A. Emrah Yükselci +1
We present Ph-CDM, a phantom-scalar realization within General Relativity of the sign-switching cosmological-constant idea, CDM, in which a phantom scalar e…
On the origin of the BAOtr-DESI tension
Ioannis Pantos, Leandros Perivolaropoulos
The fiducial-independent angular/transverse BAO dataset, obtained from two-point angular correlation functions in thin redshift shells (hereafter BAOtr), systematically prefers sma…