Dimitrios Efstratiou

most citedAddressing the DESI DR2 Phantom-Crossing Anomaly and Enhanced

H_{0}

Tension with Reconstructed Scalar-Tensor Gravity

5 citations · 5 across the 4 of their papers we have counts for

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gr-qc2026

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 $(m_{\pm}, Λ_{\pm})$ . Near the equilibrium…

gr-qc2025

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 $U_{min}$ of a scalar field potential, where the scalar field is frozen due to a large mass. If this vacuum is…