Geodesic Deviation in 2D: Is There Directional Dependence?

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The discussion centers on the geodesic deviation equation in two dimensions, specifically questioning whether it is governed by a single scalar, R, that is independent of the direction of the geodesics. The equation d²ξ/ds² + Rξ = 0 is presented, highlighting the need to explore the implications of R's independence from direction. Participants also inquire about the role of the metric in defining directional dependence, particularly in the context of the variables t and x.

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AcidRainLiTE
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In 2 dimensions, is the geodesic deviation equation governed by a single scalar, independent of the direction of the geodesics? That is, if ξ is the separation of two nearby geodesics, do we have [tex]d^2 \xi/ds^2 + R\xi = 0[/tex] where R is a scalar that is completely independent of the direction of the geodesics?

If so, how can we see that there can be no directional dependence in 2d?
 
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AcidRainLiTE said:
In 2 dimensions, is the geodesic deviation equation governed by a single scalar, independent of the direction of the geodesics? That is, if ξ is the separation of two nearby geodesics, do we have [tex]d^2 \xi/ds^2 + R\xi = 0[/tex] where R is a scalar that is completely independent of the direction of the geodesics?

If so, how can we see that there can be no directional dependence in 2d?
By 2D do you mean ##t,x## ? So if you have a metric ##ds^2=-g_{00} dt^2 + g_{11}dx^2##, can you work it out explicitly ? If the velocities of the geodesics depend on ##t## or ##x##, is that directional dependence ?
 

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