Subject: [newbie] Scalar field's eq. of motion (itensor)
From: Victor Stabile
Date: Tue, 9 Dec 2008 00:11:55 -0200
Hi,
I want to calculate the free real scalar field's equation of motion (flat space-time), so I go like:
load("itensor")
imetric(g)
ishow(L:-g([-u,-v],[])*covdiff(S([],[]),u)*covdiff(S([],[]),v)-m^2*S([],[])^2)$
ishow( diff(L,S([],[])) - covdiff( diff(L, covdiff(S([],[]),l) ),l ) )$
Now the problem: covdiff is differentiating the metric. How can I avoid that?
Thanks
Victor
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