3 papers
astro-ph.HE2025
Selected topics on: 1) proposal of interpreting the Crab supernova with a GRB 2) progress in identifying the seven GRBs episodes 3) the role of Sagittarius A in identifying the dark matter component (the X fermion)
R. Ruffini, C. Sigismondi, Y. Wang +10
As the fiftieth anniversary of our common effort in the field of relativistic astrophysics is approaching, we offer a new look to some of our acquired knowledge in a more complete…
gr-qc2024
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…
gr-qc2024
The role of the irreducible mass in repetitive Penrose energy extraction processes in a Kerr black hole
R. Ruffini, C. L. Bianco, M. Prakapenia +3
The concept of the irreducible mass () has led to the mass-energy () formula of a Kerr black hole (BH), in turn leading to its surface area . T…