2 papers
gr-qc2025
The Measure of a Mass
NÃckolas de Aguiar Alves, Bruno Arderucio Costa
The concept of mass is central to any theory of gravity. Nevertheless, defining mass in general relativity is a difficult task, and even when it can be accomplished, we still need…
gr-qc2025
Positive Mass in General Relativity Without Energy Conditions
NÃckolas de Aguiar Alves, Andre G. S. Landulfo, Bruno Arderucio Costa
A long-standing problem in physics is why observed masses are always positive. While energy conditions in quantum field theory can partly answer this problem, in this paper we find…