4 papers
Lectures on the Bondi--Metzner--Sachs group and related topics in infrared physics
NÃckolas de Aguiar Alves
These are the extended lecture notes for a minicourse presented at the I São Paulo School on Gravitational Physics discussing the Bondi--Metzner--Sachs (BMS) group, the group of s…
Using thermodynamics to learn gravitational wave physics
Caio César Rodrigues Evangelista, NÃckolas de Aguiar Alves
Black holes are some of the most interesting objects in the universe. While they first arise in the complicated behavior of general relativity, the physical laws ruling their behav…
Null infinity as a Killing horizon
NÃckolas de Aguiar Alves, Andre G. S. Landulfo
Symmetries are ubiquitous in modern physics. They not only allow for a more simplified description of physical systems but also, from a more fundamental perspective, can be seen as…
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…