From: Eugene Leitl (Eugene.Leitl@lrz.uni-muenchen.de)
Date: Sun Jan 13 2002 - 03:59:15 MST
On Sun, 13 Jan 2002, Damien Broderick wrote:
> This might be old stuff to Robert, but has anyone run off a detailed range
> of possibilities for how such a history might affect the observable cosmos?
> Assuming that life couldn't emerge until, say, five billion years ago, but
> gets statistically more likely with each gigayear since (and hence
> proximity to YOU ARE HERE <= ), can we chart corrections to luminosity
If you're looking far, you're looking into an older universe. I think
there's delayed hatching due to insufficient metal abundances in the young
Plus, I think it looks fairly likely that the expansion front of pioneers
hugs the light cone of the nucleation event with only a small lag. The
front restructures anything into self, hence making emergence of new life
impossible, plus killing anything it touches but other expansion
wavefronts, thus removing the observers or potential observers in future.
I think above mechanisms make observation of expanding others improbable.
> factors taken for granted by astronomers who assume an unengineered
> universe? If closer galaxies are stochastically dimmer or red-downshifted,
> mustn't this do something interesting to the canonical calculated recession
> rate and hence projected closure vs. openness?
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