[ExI] Expansion of the Universe

[Tomaz Kristan]

> Seen galaxy collision simulations? Galaxies pass right through each
other. There is some dynamical friction, but it is very small compared to
the velocities between in-falling galaxies. You end up with two scattered
galaxies moving apart.

Two galaxies properly infested with the right kind of probes would collide
much better than what we see in a natural collision. Stars would be
decomposed to something much more suitable for a collision.

> Do you want the extra mass in order to reduce tidal forces at the horizon?

That also. But mainly as a mass/energy source for our toys.

P.S. This all may change a little, if we will be able to harness the dark
matter also.

P.P.S. This all may change a lot, if we will be able to harness the dark
energy also.





On Mon, Dec 31, 2012 at 2:14 PM, Anders Sandberg <anders at aleph.se> wrote:

> On 2012-12-31 13:08, Tomaz Kristan wrote:
>
>>  > We probably want to *stop* the galaxy as it arrives
>>
>> Don't worry! It will be stopped with the galaxy coming from the opposite
>> direction.
>>
>
> Seen galaxy collision simulations? Galaxies pass right through each other.
> There is some dynamical friction, but it is very small compared to the
> velocities between in-falling galaxies. You end up with two scattered
> galaxies moving apart.
>
>
>
>  In the case of the eternal inflation we should consider this very
>> seriously. Building a hyper-massive black hole here.
>>
>
> Do you want the extra mass in order to reduce tidal forces at the horizon?
> It is not clear that extra mass is terribly useful when breeding baby
> universes.
>
>
>
> --
> Anders Sandberg
> Future of Humanity Institute
> Oxford University
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