Smolin-TWOP on string theory does not reproduce time dependant phenomenon

[ensabah6]

While I cannot now offer a page #, Smolin in TWOP offers his assessment of string theory as a theory of QG by pointing out that while GR does offer quantitative predictions of time dilation effects, string theory does not (if I understood Smolin correctly).

Any comments?

 

[marcus]

Get your page reference and exact quote, we can't have a discussion based on vague hearsay, with no assurance that you got the correct impression from what you read.

Maybe someone else can get a page reference and quote for this. I don't remember seeing what you say you saw in the book, but someone else may.

...Smolin in [The Trouble with Physics] ... pointing out that while GR does offer quantitative predictions of time dilation effects, string theory does not...

 

[ensabah6]

Get your page reference and exact quote, we can't have a discussion based on vague hearsay, with no assurance that you got the correct impression from what you read.

Maybe someone else can get a page reference and quote for this. I don't remember seeing what you say you saw in the book, but someone else may.

Smolin was alluding to this:

http://en.wikipedia.org/wiki/String_theory

"Yet another central problem of string theory is that the best understood backgrounds of string theory preserve much of the supersymmetry of the underlying theory, which results in time-invariant space-times: currently string theory cannot deal well with time-dependent, cosmological backgrounds."

Smolin argues that the above failure is why string theory is NOT a theory of QG.


Personally there is no guarantee that the 11D of strings will hide away 4 large smooth dimensions. The so-called semiclassical limit of string QG is as far away as in LQG.