3 papers
gr-qc2024
The Operational Meaning of Total Energy of Isolated Systems in General Relativity
Abhay Ashtekar, Simone Speziale
We present thought experiments to measure the Arnowitt-Deser-Misner and Bondi-Sachs energy of isolated systems in general relativity. The expression of the Bondi-Sachs energy used…
hep-th2024
Null Infinity as a Weakly Isolated Horizon
Abhay Ashtekar, Simone Speziale
Null infinity arises as a boundary of the Penrose conformal completion of an asymptotically flat physical space-time. We first note that null infinity is a weakly isolated horizon…
hep-th2024
Null Infinity and Horizons: A New Approach to Fluxes and Charges
Abhay Ashtekar, Simone Speziale
We introduce a Hamiltonian framework tailored to degrees of freedom (DOF) of field theories that reside in suitable 3-dimensional open regions, and then apply it to the gravitation…