null geodesic造句

Such boundaries are generated by null geodesics.
So, if all the null geodesics collide, there is no boundary to the future.
We also have two sets of null geodesics spiralling into two different events on the green world line.
It is worth remarking that the null geodesics " spiral " inwards in the above figure.
One can define geometrical quantities that measure the Lorentz boost and area increase on going round these closed null geodesics.
It's difficult to find null geodesic in a sentence. 用null geodesic造句挺难的

Roger Penrose has observed that near a null geodesic, " every Lorentzian spacetime looks like a plane wave ".
In general relativity, it is assumed that inertial motion occurs along timelike and null geodesics of spacetime as parameterized by proper time.
Expressing the metric in this form shows clearly that null geodesics are inclined at \ pm 45 ^ \ circ to the horizontal.
When the null geodesics intersect, they are no longer on the boundary of the future, they are in the interior of the future.
These families of inward and outward bound radial null geodesics represent very different curves in spacetime and their projections do not agree for ? > 0.
It turns out that the most general pp-wave spacetime has only one Killing vector field, the null geodesic congruence k = \ partial _ v.
He showed that some or all of the null geodesics emitted at a given event will be refocused at a later event ( or string of events ).
Describing the mutual motion of the test particles in a null geodesic congruence in a spacetime such as the FRW dust is a very important problem in general relativity.
:: My question might be better summed up by asking if each for each null geodesic will be there a light ray in the pulse that will follow it?
Considering the null geodesic equation again, one can see that if dU / dt = c, dX / dt = 0 meaning that light comes to a standstill.

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