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someone please help me understand

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- Thread starter chris_183
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- #1

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someone please help me understand

- #2

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I might be wrong though.

- #3

Haelfix

Science Advisor

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Its useful b/c ultimately its a formalism to deal with the many body problem.

- #4

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someone please help me understand

As Haelfix has stated, it is most widely used in the treatment of many-body physics. The best introduction to it is Mattuck's book "A Guide to Feynman Diagrams in the Many-Body Problem".

All QFT need not be relativistic, or at least, not dealing with relativistic effects, in condensed matter physics.

Zz.

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what does the SR mean?

- #6

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what does the SR mean?

Special relativity.

- #7

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someone please help me understand

As people have pointed out, QFT doesn't really have anything to do with special relativity. It is fundamentally the study of fields, from a quantum point of view. These field *can* be relativistic, and currently QFT really the only mainstream accepted way to do quantum mechanics in a relativistic manner. However, nothing constrains it to that arena.

Most frequently in condensed matter, we approximate some macroscopic system as a set of interacting fields. For instance, lattices can be approximated as an elastic continuum for the purposes of looking at phonons. However, due to the real intrinsic lower bound on the scale of the system, the theory has a frequency cut-off --- something which is very general in condensed matter field theory.

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