Discussion Overview
The discussion revolves around the nature of photons emitted by electrons in a magnetic field, particularly in relation to virtual photons and their connection to phenomena like MRI and Zeeman transitions. Participants explore the distinction between real and virtual photons in the context of quantum mechanics and magnetic resonance.
Discussion Character
- Exploratory
- Technical explanation
- Debate/contested
Main Points Raised
- One participant references Leonard Susskind's description of an electron radiating a photon when transitioning between spin states in a magnetic field, questioning if this photon is a virtual photon related to electromagnetic mediation.
- Another participant clarifies that the photons involved in magnetic resonance are real photons of low energy, specifically in the context of MRI, which primarily involves protons rather than electrons.
- A third participant explains that virtual photons are not emitted as real photons and are represented as internal lines in Feynman diagrams, suggesting that they cannot be directly radiated.
- A later reply emphasizes that the photon emitted from an electron's spin flip is a real photon, observable as electromagnetic waves, and cites the 21 cm line of hydrogen as a significant example.
Areas of Agreement / Disagreement
Participants express differing views on the nature of the photons involved in the discussed processes, with some asserting that virtual photons cannot be emitted while others focus on the real photons associated with magnetic resonance. The discussion remains unresolved regarding the relationship between virtual photons and the phenomena described.
Contextual Notes
Participants highlight the distinction between real and virtual photons, with some assumptions about the applicability of quantum mechanics to classical phenomena like MRI. The discussion does not resolve the complexities of these concepts.