Can String Theory's Extra Dimensions Be Larger Than We Think?

[Stanley Lee]

I hope I'm asking in the right forum. I'm trying to understand the subject of more dimensions a little better.
Does the dimensions predicted by string theory have to be small?
Can our known dimensions predicted by string theory actually be inside much larger dimensions?

 

[mathman]

Dimensions are independent entities. A dimension cannot be inside of another dimension.

 

[rootone]

Yes, but the OP has raised a point about string theories which puzzle me too.
If a string theory requires extra dimensions, why should these only be comparatively small in scale as compared to regular observable dimensions of space/time.
Is a macromacro scale dimension or more, equally much of a possibililty?

 

[bhobba]

Yes, but the OP has raised a point about string theories which puzzle me too.

There are versions where its large as well:
https://en.wikipedia.org/wiki/Brane_cosmology

Thanks
Bill

 

[Nugatory]

Hartle's GR textbook has a one-page sidebar discussion of the metric structure of "tiny rolled-up dimensions" and why they would have escaped everyday notice and the attention of experimentalists to date. It's a good starting point for the subject.

 

[mitchell porter]

There was a time when I thought the focus on the extra dimensions being small was unnatural and biased. Then Randall and Sundrum came along with a scenario of large extra dimensions. And then Maldacena came up with AdS/CFT, a situation in which compact extra dimensions appear naturally (in the AdS side of the duality). That made me more accepting of the standard ideas about the extra dimensions.