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I began to read this paper :http://www.physics.adelaide.edu.au/mathphysics/abstracts/ADP-95-11-M28.html"

On page 9 the author foliates spacetime into spatial hypersurfaces, [tex] \Sigma_t [/tex], labeled by a global time function, t.

for each point of [tex] \Sigma^t [/tex] there is a vector [tex]n_\mu[/tex] orthogonal to it

These vectors generate a flow on spacetime.

Physically what are these curves? are they geodesics?

Have you links using his notations for the intrinsic metric?

thanks.

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# Foliating spacetime

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