#1
Jan2404, 04:05 AM

P: n/a

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

P: n/a

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

P: n/a

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 


Register to reply 
Related Discussions  
Mean Absolute Deviation/Standard Deviation Ratio  Set Theory, Logic, Probability, Statistics  6  
Geodesic deviation equation  Special & General Relativity  0  
geodesic deviation equation  Differential Geometry  1  
sun forms different geodesic  Special & General Relativity  18  
geodesic deviation  Special & General Relativity  2 