12.07.2015 Views

Simple Nature - Light and Matter

Simple Nature - Light and Matter

Simple Nature - Light and Matter

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equals half the interval, <strong>and</strong> the area is the same in all frames,the interval is equal in all frames as well.ab / Example 9.A numerical example of invariance example 9Figure ab shows two frames of reference in motion relative toone another at v = 3/5. (For this velocity, the stretching <strong>and</strong>squishing of the main diagonals are both by a factor of 2.) Eventsare marked at coordinates that in the frame represented by thesquare are(t, x) = (0, 0)<strong>and</strong>(t, x) = (13, 11) .The interval between these events is 13 2 − 11 2 = 48. In theframe represented by the parallelogram, the same two events lieat coordinates(t ′ , x ′ ) = (0, 0) <strong>and</strong>(t ′ , x ′ ) = (8, 4) .Calculating the interval using these values, the result is8 2 − 4 2 = 48, which comes out the same as in the other frame.Section 7.2 Distortion of Space <strong>and</strong> Time 405

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