Is a Black Hole a Neutron Star? A Finite-Density Core Hypothesis

Planck-scale black hole remnants inside neutron stars

We examine a Planck-scale regular black-hole remnant in neutron-star matter using a T-duality-inspired effective geometry and explicitly separate geometrical results from assumptions about absorption and emission. Within the static family, the surface-gravity temperature grows as $(M-M_{\rm ext})^{1/2}$ after a small m...

Collisions of Multiple Black Holes: A Numerical Relativity Study

Numerical relativity has a profound impact on gravitational theory and gravitational wave astronomy. In this work, we present a systematic study of the head-on collisions of multipule black hole systems within the framework of numerical relativity using the Baumgarte-Shapiro-Shibata-Nakamura (BSSN) formulation. The num...

CHAPTER 14: Binary Black-Hole Mergers as Hydrogen-Like Gravitational Molecules

We develop a quantum-geometrical model of binary black-hole coalescence within the Nexus Paradigm (NP), in which black holes are represented by quantized Ricci-soliton states with eigen-radii rn = n2GM/c2. Binary configurations are formulated as coupled two-centre gravitational eigenstates whose evolution is described...

Binary black-hole mergers as hydrogen-like gravitational molecules

Numerical simulations of low-mass black hole-neutron star mergers with moderate eccentricities

A confident detection of orbital eccentricity in gravitational-wave signals from black hole-neutron star systems would be a strong indicator of their dynamical formation origin. While eccentric waveform models have recently been developed, their validity for analyzing black hole--neutron star signals has yet to be test...

Black holes with conical infinity in gravitational caloric theory

Whether gravitational caloric theory admits spherical black-hole solutions beyond Schwarzschild remains open. A well-defined black-hole solution requires both a regular horizon and a nonsingular exterior extending to infinity. To investigate this question, we cast the vacuum equations for a purely radial caloric field...