3 papers
physics.gen-ph2026
Liénard--Wiechert potentials and the electromagnetic memory effect
Níckolas de Aguiar Alves, Bruno Arderucio Costa
Classical electrodynamics is one of the most well-tested and understood theories in physics. After more than a century of history, it may be surprising that such an established the…
gr-qc2025
The Measure of a Mass
Níckolas 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-qc2024
Positive Mass in General Relativity Without Energy Conditions
Níckolas 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…