By Igor Herbut

Serious phenomena is among the most fun components of contemporary physics. This 2007 booklet presents an intensive yet financial creation into the foundations and methods of the speculation of severe phenomena and the renormalization workforce, from the point of view of contemporary condensed subject physics. Assuming uncomplicated wisdom of quantum and statistical mechanics, the booklet discusses part transitions in magnets, superfluids, superconductors, and gauge box theories. specific recognition is given to issues comparable to gauge box fluctuations in superconductors, the Kosterlitz-Thouless transition, duality variations, and quantum section transitions - all of that are on the leading edge of physics study. This booklet comprises a variety of difficulties of various levels of trouble, with ideas. those difficulties supply readers with a wealth of fabric to check their figuring out of the topic. it truly is excellent for graduate scholars and more matured researchers within the fields of condensed subject physics, statistical physics, and many-body physics.

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**Additional resources for A Modern Approach to Critical Phenomena **

**Sample text**

28) is in fact at its finite maximum at T = TBEC . If the number of particles is fixed, this means that at T < TBEC some of the singleparticle states must be occupied by a finite fraction of the total number of particles to make up for the difference. This singular contribution has been missed by approximating the discrete sum over wavevectors with the integral, and needs to be added separately. As the occupation number is a decreasing function of energy, the macroscopically occupied state below TBEC is the ground state at k = 0.

This singular contribution has been missed by approximating the discrete sum over wavevectors with the integral, and needs to be added separately. As the occupation number is a decreasing function of energy, the macroscopically occupied state below TBEC is the ground state at k = 0. This is the phenomenon of Bose–Einstein condensation. The Bose–Einstein condensation temperature TBEC is therefore determined by the density of particles and Eq. 29), and the number of particles in the condensate N0 for T < TBEC is N0 =1− N T TBEC 3/2 .

32) where the average | (r , τ )|2 is to be self-consistently computed. This is the so-called “Hartree approximation”. 33) in the partition function for the effective non-interacting system, as in Eq. 23). 34) where we introduced again an infinitesimal η. The Bose–Einstein condensation now occurs not at μ = 0 but at μ ˜ = 0, which corresponds to μ = μc (T ) = λ 2 k2 dk 2mkB T e −1 (2π )d −1 . 35) For d > 2 the integral over the wavevectors is finite. Rescaling the wavevectors with temperature, we see that at low temperatures the transition line behaves d like μc (T ) ∝ T 2 .