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I am wondering,

if I am sitting on my chair, here at home, planet Earth, am I accelerating (in GR)?

Does the tangent four-vector [itex]u[/itex] to my worldline obey the equation

[tex]

\nabla_{u} u = a

[/tex]

or instead

[tex]

\nabla_{u} u = 0

[/tex]

??

and if the first one is correct, is the four-vector [itex]a[/itex] constant?

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# I am sitting on my chair, am I accelerating for General Relativity?

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