Asymptotic Symmetries

Intuitive

[S]ymmetries of gravitational systems, that is, changes of coordinates that can be applied to space-time and that leave invariant the large-distance behaviour of the gravitational field. They are known as asymptotic symmetries and can be thought of as a generalization of Poincaré symmetry for systems endowed with a weak gravitational field. In other words, these symmetries are those one would observe by looking at a gravitational system “from far away”B. Oblak, BMS Particles in Three Dimensions, Springer Theses

Concrete

In this section things should be explained by analogy and with pictures and, if necessary, some formulas.

Abstract

The motto in this section is: the higher the level of abstraction, the better.