Re: Tipler In An Open Universe

Anders Sandberg (
22 Jan 1998 23:10:29 +0100 (David A Musick) writes:

> But did his ideas really require that the *entire* universe collapse into
> a singularity? Or would it work if only a sufficiently large,
> life-filled part of it collapsed into a singularity?

I'm not sure, I have been looking through the appendices of _The
Physics of Immortality_, and the theorems do not seem to apply. If you
can somehow "separate" a part of spacetime and give it the right
geometry, then an omega point seems to be possible. The big problem is
how to do this; just adding together a lot of mass will create a mere
black hole, which has the wrong internal geometry to act as an omega
point (the singularity is spacelike but extended to an infalling
observer, so you cannot communicate indefinitely as it is
approached). How to make a topology that looks like a closed universe?

> Is there enough energy in the creation of
> this singularity to simulate a universe of infinite (subjective) length,
> as Tipler proposes there would be if the entire universe collapsed?

I think you can extract a diverging amount of energy from the shear,
but it doesn't seem to diverge fast enough.

Anders Sandberg                                      Towards Ascension!                  
GCS/M/S/O d++ -p+ c++++ !l u+ e++ m++ s+/+ n--- h+/* f+ g+ w++ t+ r+ !y