[ExI] Fermi question, was is a FTL drive a dream . . .

[Eugen Leitl]

On Wed, Dec 21, 2011 at 09:57:36AM +0100, Anders Sandberg wrote:
> On 2011-12-21 09:00, Eugen Leitl wrote:
>>> front, and maybe even a universal dimming. It also interacts with
>>> Robin's cosmic commons scenario.
>>
>> I don't see how cosmic commons is possible. The assumptions make no
>> sense.
>
> Which assumptions in the scenario make no sense?

Basically almost every assumption is ad hoc. It's something an
economist would write, who is accustomed to deal with a narrow scope of
interactions among members of a single local species. 

You think the http://hanson.gmu.edu/filluniv.pdf paper is good, yes?

> Some interesting questions about the visibility of probes slowing down.  
> Continous antimatter rockets would show a very unusual signature of  
> blueshifted annihilation plus blackbody radiation, but Drexler suggested  
> something more akin to backwards pointing railguns that might be far  
> harder to see.

Do you disagree that the anthropic principle prevents observation
of relativistically expanding preexpansive observer-extinguishing 
fronts very effectively?