Phantom Hypermassive Black Holes: A Theoretical Framework for Weakly-Coupled Gravitational Objects in Extra-Dimensional Spacetime

Abstract

We propose a novel class of gravitational objects termed Phantom Hypermassive Black Holes (PHBHs)-hypothetical compact objects with masses M ≫ 10¹⁰ M☉ that exhibit minimal local spacetime interaction while remaining gravitationally detectable. These objects arise naturally in models with extra dimensions where gravitational coupling strength varies with dimensional access. PHBHs represent a quantum superposition of localized states across multiple branes, leading to effective gravitational "ghosting" in 4D spacetime while preserving observational signatures through weak lensing and gravitational wave emission. We develop the theoretical framework, propose detection mechanisms, and discuss implications for dark matter, cosmic structure formation, and fundamental physics.