null geodesic वाक्य

In relativity, the Ricci curvature, which determines the collision properties of geodesics, is determined by the congruence of parallel null geodesics once it starts decreasing, will reach zero in a finite time.
These lightcone coordinates have the useful feature that outgoing null geodesics are given by U = \ text { constant }, while ingoing null geodesics are given by V = \ text { constant }.
These lightcone coordinates have the useful feature that outgoing null geodesics are given by U = \ text { constant }, while ingoing null geodesics are given by V = \ text { constant }.
It only guarantees that if one follows the time-like geodesics into the future, it is impossible for the boundary of the region they form to be generated by the null geodesics from the surface.
That is, when we look at the stars and say " The light from that star which I am receiving is X years old ", we are looking down this line of sight : a null geodesic.

This last equation signifies that the particle is moving along a timelike geodesic; massless particles like the photon instead follow null geodesics ( replace " 1 with zero on the right-hand side of the last equation ).
In General Relativity, as Allen notes above, this happens automatically because gravity isn't really a force after all and everything travels along null geodesics .-- SCZenz 15 : 32, 13 September 2006 ( UTC)
Geodesics for massless particles are called " null geodesics ", since they lie in a " light cone " or " null cone " of spacetime, while those for massive particles are called " non-null geodesics ".
Geodesics for massless particles are called " null geodesics ", since they lie in a " light cone " or " null cone " of spacetime, while those for massive particles are called " non-null geodesics ".
Note that the null geodesics are of course " geometrically straight "; in the figure, they appear to be spirals only because the coordinates are " rotating " in order to permit the dust particles to appear stationary.