Geodesic expansion in Mathematica

[unih]

Does anybody knows the package that can, given metric and equation of hypersurface (spacelike or null )calculate induced metric, external curvature and expansion (Raychaudhuri equation) in Mathematica.
Thanks

 

[Simon_Tyler]

I think that xAct (http://www.xact.es/) can calculate induced metrics and related quantities...

 

[unih]

I Know that it can calculate induced metrics and external curvatures.
May be you know how to calculate there normals to hypersurfaces and expansions?

 

[Simon_Tyler]

Sorry... I've never actually done more than play with a couple of the tutorial notebooks. Maybe you should post on https://groups.google.com/forum/?hl=en#!forum/xact