6.2
The direction towards the singularity
In the study of the direction towards the singularity, it is convenient to change the time coordinate to
, so that the singularity corresponds to
. The metric then becomes
Here,
and
are coordinates on
T
3
. Einstein’s vacuum equations take the form
and
Living Rev. Relativity
13, (2010), 2
http://www.livingreviews.org/lrr-2010-2
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