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Polytropic wormholes
Remo Garattini, Emmanuel N. Saridakis, Athanasios G. Tzikas
Traversable wormholes in general relativity require non-standard matter sources, making the identification of physically motivated equations of state particularly important. We inv…
Phenomenological Rotating Extension of Black Holes with Primary Scalar Hair: Shadow Signatures in Beyond Horndeski Gravity
Kourosh Nozari, Milad Hajebrahimi, Sara Saghafi +2
The Event Horizon Telescope (EHT) image of M87* provides a direct test of strong-field gravity, measuring an angular shadow diameter and a circularity…
Multi-probe analysis of strong-field effects in gravity
Mohsen Khodadi, Behnam Pourhassan, Emmanuel N. Saridakis
Covariant gravity is a viable extension of General Relativity, however its strong-field predictions remain largely untested. Using the static, spherically symmetric black-ho…
Branch structure and nonextensive thermodynamics of Kalb-Ramond-ModMax black holes: observational signatures
Erdem Sucu, Izzet Sakalli, Emmanuel N. Saridakis
Motivated by the low-energy effective action of heterotic string theory, where the Kalb-Ramond (KR) two-form and nonlinear gauge corrections arise simultaneously, we investigate a…
Atomic clocks and gravitational waves as probes of non-metricity
Mohsen Khodadi, Emmanuel N. Saridakis
Non-metricity provides a natural extension of Riemannian geometry, yet its experimental signatures remain largely unexplored. In this work, we investigate how spacetime non-metrici…