Knowledge of the renormalization group and field theory is a key
part of physics, and is essential in condensed matter and particle
physics. Written for advanced undergraduate and beginning graduate
students, this textbook provides a concise introduction to this
subject. The textbook deals directly with the loop-expansion of the
free-energy, also known as the background field method. This is a
powerful method, especially when dealing with symmetries, and
statistical mechanics. In focussing on free-energy, the author
avoids long developments on field theory techniques. The necessity
of renormalization then follows.
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