Relativistic Aberration for Accelerating Observers

Details Relativistic Aberration for Accelerating Observers Relativistic Aberration for Accelerating Observers

2007-08-23

arxiv.org/abs/0708.3209v2

Am. J. Phys. 76 663 (2008)

Physics

Classical Physics

7 figures; subject: special relativity; pedagogical article; replaced to match version appearing in Am. J. Phys

Scientific paper

10.1119/1.2888542

We investigate the effects of the aberration of light for a uniformly accelerating observer. The observer we consider is initially at rest with respect to a luminous spherical object--a star, say--and then starts to move away with constant acceleration. The main results we derive are the following: (i) The observer always sees an initial increase of the apparent size of the object; (ii) The apparent size of the object approaches a non-zero value as the proper time of the observer goes to infinity. (iii) There exists a critical value of the acceleration such that the apparent size of the object is always increasing when the acceleration is super-critical. We show that, while (i) is a purely non-relativistic effect, (ii) and (iii) are effects of the relativistic aberration of light and are intimately connected with the Lorentzian geometry of Minkowksi spacetime. Finally, the examples we present illustrate that, while more or less negligible in everyday life, the three effects can be significant in the context of space-flight.

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