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Geodesic Deviation 
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#1
Jan2404, 04:05 AM

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Can someone take a look at
http://wps.aw.com/wps/media/objects/...ments/Ch21.pdf and tell me how they go from Eq. (7) to Eq. (8)? I've tried this and keep getting additional terms. 


#2
Jan2404, 11:19 AM

P: 657

remember that x is a geodesic. so there is a geodesic equation in x, and it therefore vanishes. and remember that χ is very small; drop any term with more than one χ in it. 


#3
Jan2404, 11:24 AM

P: n/a

One has to drop not only the term &chi*&chi but the term which is the product of &chi and a derivative of &chi. That was what I was missing. 


#4
Jan2404, 11:59 AM

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Geodesic Deviation
Thank you
I believe that I've fingered it out One has to drop not only the term χ*χ but the term which is the product of χ and a derivative of χ. That was what I was missing. Again  thanks for the response Arcon 


#5
Jan2504, 12:55 PM

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Just to make sure I understood the approximation can you check this for me? http://www.geocities.com/physics_wor..._deviation.htm I commented on the terms to drop right after Eq. (14) and right after Eq. (15) Thanks I don't know how I missed this before but the equation of geodesic deviation clearly shows that tidal forces are velocity dependant! Arcon 


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