172 citations · 343 across the 26 of their papers we have counts for
27 papers
The Crab Nebula progenitor: recovering the 1054 AD supernova event as galactic Gamma-ray burst
Costantino Sigismondi, Remo Ruffini
In 1054 AD a daytime star appeared in the constellation of Taurus, for three weeks, and it was reported in various sources from Europe to China/Japan: it was one of the few documen…
Extreme Kerr Newman Black Holes: Differential Geometry, Symmetry, and the Golden Ratio
Remo Ruffini, Giorgio Sonnino
We investigate the geometry of extreme Kerr-Newman black holes and its role in selecting distinct black hole states. Motivated by Smarr's question of what physical information is e…
Irreducible-Mass Balance for Magnetized Null Horizons with an Internal Current Sheet
Remo Ruffini, Giorgio Sonnino
We begin with a general question: how does the irreducible mass of a magnetized black hole change when the horizon is not stationary? The null Raychaudhuri equation gives an exact…
Irreducible-Mass Growth and Extractable Energy in a Self-Gravitating Blandford-Znajek Engine
Remo Ruffini, Giorgio Sonnino
Wang recently constructed a self-gravitating split-monopole Blandford-Znajek engine and obtained its secular horizon mass and angular-momentum loss rates. We determine the previous…
The formalism of energy conservation during particle decay in the Kerr spacetime
Shurui Zhang, Remo Ruffini
We derive a compact, covariant expression for the relative Lorentz factor of two particles in curved spacetime and apply it to particle decay in Kerr spacetime. This allows us to s…
Growth of High-Redshift Quasars from Fermion Dark Matter Seeds
Yu Wang, Remo Ruffini
Quasars hosting black holes at challenge growth scenarios that start from light seeds and assume accretion within already formed galaxies. Motivated…