String Theory & Dimensions: Interactions Explained

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Does string theory use multiple dimensions to explain why certain particles don't interact with others? If so, why wouldn't shape be used; as it is when explaining why certain proteins don't interact with cells?

As far as I'm concerned, the multiple dimensions used in string theory have a purely mathematical origin. The problem does not arise when looking at interactions, but when trying to make "classical" string theory compatible with quantum mechanics. Adding interactions only makes things more complicated. When you do the math, you get a (more-or-less) inconsistent theory, unless the number of dimensions of spacetime is exactly right. AFAIK there is no physical argument that explains or even makes plausible why there should be so many dimensions.

1. What is String Theory?

String Theory is a theoretical framework in physics that attempts to reconcile the theories of General Relativity and Quantum Mechanics. It posits that the fundamental building blocks of the universe are not point-like particles, but rather tiny strings that vibrate at different frequencies.

2. How many dimensions are there in String Theory?

String Theory requires at least 10 dimensions - 9 spatial dimensions and 1 time dimension - in order to be mathematically consistent. However, some versions of the theory suggest the existence of additional dimensions beyond the 10 we are familiar with.

3. How do dimensions interact in String Theory?

In String Theory, the extra dimensions are compactified or "curled up" at a microscopic scale, making them imperceptible to our everyday experience. However, the interactions between particles in our 4-dimensional world are influenced by the presence of these extra dimensions.

4. What is the relationship between String Theory and Quantum Mechanics?

String Theory is often seen as a potential solution to the problems of Quantum Mechanics, such as the incompatibility between General Relativity and Quantum Mechanics. It provides a way to reconcile the two theories by describing particles as tiny strings rather than point-like particles.

5. Is there any evidence for String Theory?

Currently, there is no empirical evidence for String Theory. However, it is an active area of research and has led to new insights and mathematical developments in theoretical physics. Some argue that future experiments or observations may provide evidence for the existence of extra dimensions predicted by String Theory.