QFT Course: Electric & Magnetic Fields, but No Fields for Electrons?

In summary, Quantum Field Theory (QFT) is a theoretical framework that combines the principles of quantum mechanics and special relativity to explain the behavior of particles and fields at the quantum level. The focus of the QFT course on Electric & Magnetic Fields is to understand the behavior of these fields and their interactions with charged particles. This course does not cover electrons, as they are particles and not fields. QFT has practical applications in predicting the behavior of subatomic particles and developing technologies, as well as playing a crucial role in modern physics research. While it can be a challenging subject, with effort and dedication, students can gain a solid understanding of QFT.
  • #1
deadringer
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I'm studying a QFT course, and we've been asked to consider why classical physicists found it useful to introduce electric and magnetic fields, but not fields for electrons or other particles. I'm completely stumped, and would appreciate any hints. thanks
 
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  • #2
The wave length of visible light is thousands of Angstroms so the wave propagation of photons was easily seen. Wave lengths of massive particles is much shorter, so their wave propagation was not noticed for a long time. Also, photons are bosons so macroscopic fields due to ~10^20 photons existed. Fermions cannot produce macroscopic field strengths.
 

1. What is QFT?

Quantum Field Theory (QFT) is a theoretical framework that describes the behavior of particles and fields at the quantum level. It combines the principles of quantum mechanics and special relativity to explain the dynamics of particles and their interactions.

2. What is the focus of the QFT course on Electric & Magnetic Fields?

The focus of this QFT course is to understand the behavior of electric and magnetic fields at the quantum level. This includes studying their interactions with charged particles and how they are affected by quantum effects.

3. Why are there no fields for electrons in this course?

This course specifically focuses on electric and magnetic fields, which are described by quantum fields. Electrons, on the other hand, are particles that interact with these fields and are not themselves considered fields. Therefore, electrons are not the main focus of this course.

4. How is QFT used in practical applications?

QFT has been used to successfully predict the behavior of subatomic particles and to develop new technologies, such as transistors and lasers. It also plays a crucial role in modern physics research, particularly in areas such as particle physics, condensed matter physics, and cosmology.

5. Is QFT a difficult subject to understand?

QFT can be a challenging subject to understand, as it combines complex mathematical concepts with abstract physical concepts. However, with dedication and effort, students can gain a solid understanding of the principles and applications of QFT.

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