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'.
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| http://www.ncbi.nlm.nih.gov/pmc/articles/PMC10788156 | PMC |
| http://dx.doi.org/10.1098/rsta.2023.0043 | DOI Listing |
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