The Adventures of the Rocketeer: Accelerated Motion Under the Influence of Expanding Space

Details The Adventures of the Rocketeer: Accelerated Motion Under the Influence of Expanding Space The Adventures of the Rocketeer: Accelerated Motion Under the Influence of Expanding Space

2009-09-08

arxiv.org/abs/0909.1551v2

Astronomy and Astrophysics

Astrophysics

Cosmology and Extragalactic Astrophysics

9 pages, 7 figures, accepted for publication in PASA

Scientific paper

It is well known that interstellar travel is bounded by the finite speed of light, but on very large scales any rocketeer would also need to consider the influence of cosmological expansion on their journey. This paper examines accelerated journeys within the framework of Friedmann- Lemaitre-Robertson-Walker universes, illustrating how the duration of a fixed acceleration sharply divides exploration over interstellar and intergalactic distances. Furthermore, we show how the universal expansion increases the difficulty of intergalactic navigation, with small uncertainties in cosmological parameters resulting in significantly large deviations. This paper also shows that, contrary to simplistic ideas, the motion of any rocketeer is indistinguishable from Newtonian gravity if the acceleration is kept small.

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