Up-tunneling is Impossible for Minkowski, DeSitter, or Anti-de Sitter

[Diffeomorphic]

http://arxiv.org/PS_cache/arxiv/pdf/1111/1111.0301v1.pdf

Hi everyone! I'd like to get a little discussion started on what you guys think about this paper if you have the time to read it. I find it really fascinating that they came to the conclusion that up-tunneling is impossible for Minkowski, DeSitter, or anti-de Sitter. They seem to have a very apt description of "down-tunelling" or going from something to nothing.

They say that the main claim of their paper is that, "Nothing should be thought of as the limit of anti-de Sitter space in which the curvature length goes to zero."

Do you think that they have provided substantial evidence for this claim and are there any problems you have found with the paper?

 

[friend]

http://arxiv.org/PS_cache/arxiv/pdf/1111/1111.0301v1.pdf

Hi everyone! I'd like to get a little discussion started on what you guys think about this paper if you have the time to read it. I find it really fascinating that they came to the conclusion that up-tunneling is impossible for Minkowski, DeSitter, or anti-de Sitter. They seem to have a very apt description of "down-tunelling" or going from something to nothing.

They say that the main claim of their paper is that, "Nothing should be thought of as the limit of anti-de Sitter space in which the curvature length goes to zero."

Do you think that they have provided substantial evidence for this claim and are there any problems you have found with the paper?

I take issue on philosophical grounds with any approach that claims that some mathematically describable physics can give rise to the universe. For there is nothing physical before the universe began. So there is no math to describe some physical principles that give rise to the universe.

 

[Diffeomorphic]

I would love to have a discussion about the Philosophy of Mathematics and the correspondence between reality and Mathematical descriptions, but could we discuss on a purely technical level the actual content of the paper, temporarily glossing over the philosophical issues for now?