# Is string theory in 10 dimensions?

## Is string theory in 10 dimensions?

Current versions of string theory require 10 dimensions total, while an even more hypothetical über-string theory known as M-theory requires 11. But when we look around the universe, we only ever see the usual three spatial dimensions plus the dimension of time.

Why does string theory only work in 10 dimensions?

Any more dimensions would result in too much supersymmetry and a theoretical structure too simple to explain the complexity of the natural world. This is reminiscent of Joe Polchinski’s argument (somewhat tongue-in-cheek, somewhat serious) that all attempts to quantize gravity should eventually lead to string theory.

What are the 11 dimensions according to string theory?

The 11th dimension is a characteristic of spacetime that has been proposed as a possible answer to questions that arise in Superstring Theory, which involves the existence of 9 dimensions of space and 1 dimension of time.

### Are there 11 dimensions?

Scientists do not believe there can exist more than 11 dimensions because conditions become unstable and particles naturally collapse back down into 10 or 11 dimensions. The 12th dimension, for example, introduces a second time. While strings can only vibrate in 10 dimensions, membranes can exist at 11 dimensions.

How many dimensions of reality are there according to superstring theory?

10 Dimensions Of Reality According To Superstring Theory. The superstring theory says that there are 10 dimensions of reality existing in universe other than the three familiar dimensions of length, height and depth. Phenomena like parallel universe or alternate realities come to our mind when we hear the term “different dimensions”.

What are some criticisms of string theory?

Initially people took this to be a criticism of string theory. If it predicts 10 dimensions and you look around and only see four (three spatial dimensions and one time dimensions) then you might ask: “Where are the other six dimensions?” But Kaluza and Klein had solved that problem 60 years earlier: they rolled the other dimensions up.

#### How many dimensions of spacetime does string theory predict?

But string theory has one very unique consequence that no other theory of physics before has had: it predicts the number of dimensions of spacetime. For the mathematics of string theory to be consistent, the number of dimensions of spacetime must be 10. Initially people took this to be a criticism of string theory.

What is superstring theory?

‘Superstring theory’ is a shorthand for supersymmetric string theory because unlike bosonic string theory, it is the version of string theory that accounts for both fermions and bosons and incorporates supersymmetry to model gravity.