1.
Philos Trans A Math Phys Eng Sci
; 382(2267): 20230043, 2024 Mar 04.
Artigo
em Inglês
| MEDLINE
| ID: mdl-38219781
RESUMO
When he first introduced the notion of a conformal boundary into the study of asymptotically empty space-times, Penrose noted that the boundary would be null, space-like or time-like according as the cosmological constant [Formula: see text] was zero, positive or negative. While most applications of the idea of a conformal boundary have been to the zero-[Formula: see text], asymptotically Minkowskian case, there also has been work on the non-zero cases. Here, we review work with a positive [Formula: see text], which is the appropriate case for cosmology of the universe in which we live. This article is part of a discussion meeting issue 'At the interface of asymptotics, conformal methods and analysis in general relativity'.