2025/06/02 by Ulf Danielsson, Danielsson, Ulf, Vyshnav Mohan +3
Arts and Humanities · Engineering · #Cultural Heritage Materials Analysis #Enhanced Oil Recovery Techniques #FOS: Physical sciences #High Energy Physics - Theory (hep-th) #Metallurgical Processes and Thermodynamics
paper · pdf · doi:10.48550/arxiv.2506.02117
openalex publication_date 2025/06/02 · openalex created_date 2025/10/14 · openalex updated_date 2026/07/28
Black shells have been proposed as black hole mimickers, i.e. horizonless ultra-compact objects that replace black holes. In this paper, we assume the existence of black shells and consider their thermodynamic properties, but remain agnostic about their wider role in gravitational physics. An ambient negative cosmological constant is introduced in order to have a well-defined canonical ensemble, leading to a rich phase structure. In particular, the Hawking-Page transition between thermal AdS vacuum and large AdS black holes is split in two, with an intermediate black shell phase, which may play a role in gauge/gravity duality at finite volume. Similarly, for non-vanishing electric charge below a critical value, a black shell phase separates two black hole phases at low and high temperatures. Above the critical charge, there are no phase transitions and large AdS black holes always have the lowest free energy.