L. Gallerani | Searcharxiv

arXiv2025

Thermal aspects of the anomalous $ω\to \infty$ limit of Brans-Dicke gravity

Brans-Dicke gravity does not always reduce to General Relativity in the limit $ω\to\infty$ for the coupling constant. This anomalous behavior is examined within the formalism of the first-order thermodynamics of scalar-tensor gravity. It is shown that this effect is linked to the non-vanishing nature of the chemical potential, in the Einstein frame formulation of the thermodynamic analogy, in the $ω\to\infty$ limit.

gr-qc↗

arXiv2025

Mass (re)distribution for quantum dust cores of black holes

The collective ground state for a spherical symmetric dust ball has been investigated recently in [R. Casadio, Phys. Lett. B 843 (2023) 138055]. In this study, we refine that model by obtaining a mass distribution that accounts for the superposition of wavefunctions across different layers. The refined mass distribution shows significant deviations from the approximation without quantum superpositions. Specifically, the new nearly parabolic distribution replaces the linear mass profile of the original work, featuring an overall downward concavity, which leads to a non-vanishing tension. Notably, the regularity of the metric and causal structure are preserved in the refined analysis.

gr-qc↗