Quantum field theory and string theory

In summary, quantum field theory is a framework for describing particle behavior and interactions, while string theory aims to unify general relativity and quantum mechanics by viewing particles as strings. String theory extends quantum field theory and provides a deeper understanding of particles and gravity. Supersymmetry is important in both theories and helps to unify fundamental forces and solve certain problems in physics. Both theories allow for the possibility of extra dimensions, which are necessary for their consistency. While there is currently no direct experimental evidence, these theories have made successful predictions and could potentially have real-world applications in understanding high energy scales and unifying fundamental forces.
  • #1
richerrich
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What is the relationship between quantum field theory and string theory?
 
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  • #2
If string theory is proven correct, then quantum field theory should be deduced from it where quantum theory holds.
 
  • #3
quantum field theory is always a limit of string theory*. for example, you can deduce things like scattering amplitudes of gluons and gravitons from string theory.

*probably too strong of a statement, it might be possible for some qft's to not be generalizable to string theory (in a non trivial way at least)
 

1. What is the difference between quantum field theory and string theory?

Quantum field theory is a theoretical framework that describes the behavior of particles and their interactions in terms of fields, while string theory is a theoretical framework that attempts to reconcile general relativity (the theory of gravity) with quantum mechanics by describing particles as vibrating strings.

2. How do quantum field theory and string theory relate to each other?

String theory can be seen as an extension of quantum field theory, as it incorporates the principles of quantum mechanics into its framework. It also provides a more fundamental understanding of particles and their interactions, including gravity.

3. What is the significance of supersymmetry in these theories?

Supersymmetry is a proposed symmetry between particles with different spin values, which is a crucial aspect of both quantum field theory and string theory. It helps to unify the fundamental forces of nature and provides a potential solution to certain problems in physics, such as the hierarchy problem.

4. How do these theories explain the concept of extra dimensions?

Both quantum field theory and string theory allow for the possibility of extra dimensions beyond the three spatial dimensions we are familiar with. These extra dimensions are believed to be compactified, or curled up, at a very small scale, and are necessary for the consistency of these theories.

5. What are the potential real-world applications of quantum field theory and string theory?

While there are currently no direct experimental evidence for these theories, they have been successful in making predictions that have been confirmed by experiments. Some potential applications include understanding the behavior of matter at extremely high energy scales, such as in the early universe, and providing a framework for a unified theory of all fundamental forces.

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