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Lectures on phase transitions and critical phenomena Nigel Goldenfeld
Publisher: Westview Press

You literally do this, you throw away a lot. At a macroscopic level correlations result from cooperative phenomena. Kopietz, Peter, Bartosch Keywords » functional renormalization group - phase transitions and critical phenomena - quantum many-body theory - strongly correlated electrons. It is impressive that Anderson did this before Wilson and Fisher used renormalisation group ideas to describe critical phenomena in classical phase transitions. Understanding these fluctuations ("critical phenomena") was a major achievement of late 20th century theoretical physics. If we have some complicated phenomenon we can't understand directly, and we figure out (or make a good stab at guessing) the universality class to which it belongs, we can make testable predictions about the complicated thing . I: When you look at for instance … a very good example is phase transitions, critical phenomena. Series: Lecture Notes in Physics, Vol. In second order transitions, you can get big fluctuations in the order of the system near the transition. There is also a discussion in "Statistical Mechanics of Phase Transitions", by J. This is my understanding of the situation, as explained for example in "Lectures on Phase Transitions and the Renormalization Group", by N. They exist in all systems exhibiting phase transitions and critical instability points. You keep only the essential part, and that does everything.