# Spinors and spin in String Theory.

• Spinnor
In summary, spinors are mathematical objects used in String Theory to describe the spin of fundamental strings and their interactions with other particles. Spin in String Theory refers to the intrinsic angular momentum of strings and is represented by spinor fields with half-integer or integer values. The significance of spin lies in its role in determining the properties and interactions of strings. While spinors and spin have not been directly observed, their predictions have been verified through experiments and observations, supporting their validity in String Theory.
Spinnor
Gold Member
Assume String Theory is headed in the right direction, can one understand electron (or any Standard Model particle spin for that matter) spin roughly in terms of some small spinning string? If so, would you consider that a selling point of the theory as it provides an explanation for intrinsic particle spin?

Do spinors come out of the classical starting point for String Theory; a moving, vibrating, and rotating string, or do we get spinors once the classical string is quantized?

Thanks for any help!

I find the idea of understanding particle spin in terms of small spinning strings intriguing. However, I must caution that while String Theory is a promising approach to unifying quantum mechanics and general relativity, it is still a highly theoretical and unproven concept. Therefore, any claims about its ability to explain intrinsic particle spin should be taken with caution.

That being said, there are some aspects of String Theory that suggest a connection between spinning strings and particle spin. For example, in String Theory, particles are described as vibrations of tiny strings, and the different modes of vibration correspond to different particle properties, such as mass and charge. It is possible that the spin of a particle could also be related to a particular mode of vibration of the string.

However, it is important to note that spin in quantum mechanics is a fundamentally different concept than the classical idea of a spinning object. In quantum mechanics, spin is an intrinsic property of particles and cannot be explained in terms of classical spinning objects. Therefore, even if String Theory does provide some insight into the origin of particle spin, it would not be accurate to say that spinors come directly from the classical starting point of a moving, vibrating, and rotating string. Spinors are a fundamental aspect of quantum mechanics and arise when the classical string is quantized.

In summary, while it is tempting to see a connection between spinning strings and particle spin, it is important to approach this idea with caution and recognize that much more research and experimentation is needed to fully understand the relationship between String Theory and the properties of particles.

## 1. What are spinors and how do they relate to String Theory?

Spinors are mathematical objects used to describe the intrinsic angular momentum of particles. In String Theory, spinors play a crucial role in describing the spin of fundamental strings and their interactions with other particles.

## 2. What is spin in the context of String Theory?

Spin in String Theory refers to the intrinsic angular momentum of fundamental strings. Unlike particles in traditional quantum mechanics, strings have a spin value that is always half-integer, and this spin determines how the string interacts with other particles.

## 3. How are spinors and spin represented in String Theory?

Spinors are represented as mathematical objects known as spinor fields, which are used to describe the spin of fundamental strings. Spin is represented by the values of the spinor fields, which can be either half-integer or integer values.

## 4. What is the significance of spin in String Theory?

The spin of strings is important because it determines how they interact with other particles. For example, strings with different spin values will have different properties and interactions, which can help explain the behavior of particles in the universe.

## 5. Are spinors and spin experimentally verified in String Theory?

While spinors and spin are fundamental concepts in String Theory, they have not yet been directly observed or experimentally verified. However, many of the predictions made by String Theory involving spin have been confirmed through various experiments and observations, providing evidence for the validity of these concepts.

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