Why would expansion at a certain speed unravel extra dimensions in string theory?

[Unredeemed]

I read somewhere that string theory could be disproved if it is found out that the universe expanded at a certain speed as this would cause the extra dimensions to unravel and therefore mean that string theory could not describe our universe. I do not understand why the extra dimensions would unravel? Can anyone help?

Many Thanks,
Jamie

 

[Unredeemed]

Anyone at all?

 

[humanino]

Hi,

do you have a reference so we can know better which model you are referring to ?

 

[Unredeemed]

I believe the paper referred to in the article I read was www.arxiv.org/abs/0704.0647