SETI public: The Long-Term Future of Space Travel - Revision V2

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Astrophysics, abstract
astro-ph/0509268

From: Jeremy S. Heyl [view email]
Date (v1): Fri, 9 Sep 2005 21:49:22 GMT (18kb)
Date (revised v2): Tue, 8 Nov 2005 05:13:13 GMT (18kb)

The Long-Term Future of Space Travel

Authors: Jeremy S. Heyl

Comments: 5 pages, 3 figures, minor changes to reflect version accepted to
PRD

The fact that we apparently live in an accelerating universe places
limitations on where humans might visit. If the current energy density of
the universe is dominated by a cosmological constant, a rocket could reach a
galaxy observed today at a redshift of 1.7 on a one-way journey or merely
0.65 on a round trip. Unfortunately these maximal trips are impractical as
they require an infinite proper time to traverse. However, calculating the
rocket trajectory in detail shows that a rocketeer could nearly reach such
galaxies within a lifetime (a long lifetime admittedly -- about 100 years).
For less negative values of $w$ the maximal redshift increases becoming
infinite for $w\geq -1/3$.

http://arxiv.org/abs/astro-ph/0509268

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