20 citations · 60 across the 4 of their papers we have counts for
4 papers
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…
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…
Horizons and Null Infinity: A Fugue in 4 voices
Abhay Ashtekar, Simone Speziale
Black hole horizons in equilibrium and null infinity of asymptotically flat space-times are null 3-manifolds but have very different physical connotations. We first show that they…
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…