Recent content by tsahi

How come, the newtinian limit conditions are defined as they are?

does anyone know of a text which derives exactly the error of Newtonian coordinates? the error of streching coordinates out from their local flatness? also, when in a small region, MTW (a.k.a the phonebook), speeks of making measurements more precise and then noting tidal effects. i did not...

hi, g.r speeks of the ability to constract local lorentz frame. how can an observer construct such a frame if spacetime is curved? what are his rods and clocks? it seems that if one tried to construct a "hive" of coords using a ruler, then it will not cross as expected... he might even...

but we have two - lorenz of the fiducial particle and Newtonian, and i meant generally the not trivial lorentz transformation between coordiate systems. my problem lies in the very ability of Newton to think space is flat and time as separate. how come the measures came out right? what were...

also, the comparison does not seem to take under account the fact the there are spatial contractions when moving to the reference frame of the fiducial particle...

all that is good and well. but when you look at the 2 equations, the geodesic deviation has a proper time of the fiducial geodesic as parameter, the tidal force has regular time as parameter. these parameters are not the same thing. so how can we simply compare the coefficients there to get...

i did not understand the last explanation. proper acceleration?

yes, i understand, but what is it that enables us to regard spacetime as flat (Newton, tidal forces analysis) and curved (geodesic analysis) at the same time?

i will sharpen the question: how can one even have a notion of a separation vector in curved spacetime? if we are only looking locally where the spacetime is flat, then there should be no geodesic deviation.

hi all, i kind of have a black hole regarding my understanding of the consistensy of tidal forces and geodesic deviation analysis. one can determine some coefficients of the riemman tensor from the tidal forces equations, by getting to a form that is like the form of the geodesic deviation...