4 papers
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…
Islands of Electromagnetic Tranquility in Our Galactic core and Little Red Dots that Shelter Molecules and Prebiotic Chemistry
Remo Ruffini, Yu Wang
Both the Galactic Center and little red dots (LRDs) host million-solar-mass black holes within dense, cold reservoirs of molecules associated with dust grains, and are electromagne…
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…
On the single versus the repetitive Penrose process in a Kerr black hole
Remo Ruffini, Mikalai Prakapenia, Hernando Quevedo +1
Extracting the rotational energy from a Kerr black hole (BH) is one of the crucial topics in relativistic astrophysics. Here, we give special attention to the Penrose ballistic pro…