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This textbook covers the main topics in contemporary condensed
matter physics in a modern and unified way, using quantum field
theory in the functional-integral approach. The book highlights
symmetry aspects in acknowledging that much of the collective
behaviors of condensed matter systems at low temperatures emerge
above a nontrivial ground state, which spontaneously breaks the
symmetry.The emphasis is on effective field theories which provide
an efficient and powerful description that is valid at long
wavelengths and low frequencies. In conjunction with the emphasis
on effective theories, a modern approach towards renormalization is
taken, whereby a wavenumber cut-off is introduced to set a scale
beyond which the microscopic model under consideration ceases to be
valid.The unique and innovative character of this presentation,
free of historical constraints, allows for a compact and
self-contained treatment of the main topics in contemporary
condensed matter physics.
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