Quantum Immortality without MWI?

[Anixx]

However, could this work even if MWI is not true?

I had a e-mail conversation with Max Tegmark on this issue. He agreed that not only MWI, but other interpretations also imply quantum immortality.

 

[Anixx]

all of those branches will have the same classical dynamics

Wrong. There are branches which are highly improbable.

 

[PeroK]

I had a e-mail conversation with Max Tegmark on this issue. He agreed that not only MWI, but other interpretations also imply quantum immortality.

I guess that's the case closed then.

 

[PeterDonis]

There are branches which are highly improbable.

Highly improbable in the sense of very finely tuned initial conditions, yes. But the dynamics from the initial conditions, whatever they are, is the same in every branch.

 

[PeterDonis]

I guess that's case closed then.

No, the fact that Tegmark makes the claim doesn't necessarily mean it's correct. I would like to see an actual paper laying out the argument.

 

[PeroK]

No, the fact that Tegmark makes the claim doesn't necessarily mean it's correct. I would like to see an actual paper laying out the argument.

If the man says he has an email, how can you argue with that?

 

[PeterDonis]

If the man says he has an email, how can you argue with that?

An email isn't a textbook or peer-reviewed paper.

 

[Anixx]

Highly improbable in the sense of very finely tuned initial conditions, yes. But the dynamics from the initial conditions, whatever they are, is the same in every branch.

No. There are branches with improbable dynamics as well. There are branches with all possible dynamics.

 

[Anixx]

If the man says he has an email, how can you argue with that?

Of course, he just expressed his opinion.

 

[PeterDonis]

There are branches with improbable dynamics as well.

Why? The laws of physics are the same in all the branches.

 

[Anixx]

Why? The laws of physics are the same in all the branches.

Not probabilistic laws though. A "weight" of a branch is proportional to its probability, but even for the least-probable outcomes there are branches.

 

[PeterDonis]

Not probabilistic laws though.

Please read the thread. These issues have already been discussed.

 

[akvadrako]

I had a e-mail conversation with Max Tegmark on this issue. He agreed that not only MWI, but other interpretations also imply quantum immortality.

This is not what he has said publically and without seeing his exact words it's hard to reconcile with his quotes on the wikipedia page, where he says QI is not real even given MWI.

But it doesn't matter much since neither is a rigorous argument but more of a casual opinion.