entropy in cosmology 1hubble tension 1modified friedmann equations 1observational constraints 1scale-dependent physics 1
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gr-qc2026
Cosmological consequences of scale-dependent Barrow-Tsallis entropy
Giuseppe Gaetano Luciano, Orlando Luongo, Marco Muccino
The paper explores a cosmological model with a scale‑dependent Barrow‑Tsallis entropy, deriving modified Friedmann equations and confronting the model with various early‑ and late‑…
gr-qc2025
Gravitational metamaterials from optical properties of spacetime media
Orlando Luongo
Gravitational optical properties are here investigated under the hypothesis of spherically-symmetric spacetimes behaving as media. To do so, we first consider two different definit…
gr-qc2024
De Sitter-like configurations with asymptotic quintessence environment
Roberto Giambò, Orlando Luongo
We examine a spherically-symmetric class of spacetimes carrying vacuum energy, while considering the influence of an external dark energy environment represented by a non-dynamical…