By Igor Herbut

Serious phenomena is among the most enjoyable parts of recent physics. This 2007 e-book presents a radical yet financial creation into the rules and strategies of the idea of severe phenomena and the renormalization staff, from the point of view of recent condensed topic physics. Assuming simple wisdom of quantum and statistical mechanics, the ebook discusses part transitions in magnets, superfluids, superconductors, and gauge box theories. specific awareness is given to subject matters similar to gauge box fluctuations in superconductors, the Kosterlitz-Thouless transition, duality changes, and quantum part transitions - all of that are on the leading edge of physics study. This booklet comprises a number of difficulties of various levels of hassle, with strategies. those difficulties supply readers with a wealth of fabric to check their figuring out of the topic. it really 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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**Extra info for A Modern Approach to Critical Phenomena **

**Example text**

First, note that mass m only provides the energy scale in Eq. 36). It is practical to rescale it out by absorbing it into the chemical potential, redefined as 2mμ/ 2 → μ, and into the interaction coupling, as 2mλ/ 2 → λ. Similarly, near the critical point, the temperature T ≈ Tc may be replaced by the critical temperature, and then eliminated by rescaling the action as 2mkB Tc S/ 2 → S. After these simplifications the superfluid susceptibility becomes a function only of the wavevector, the (rescaled) chemical potential, 43 44 Renormalization group and the interaction: χ (k) = F(k, μ, λ).

With the interaction term present one in general cannot find the quantum numbers which would factorize the path integral. This is a consequence of the quantum mechanical uncertainty relation between the position and the momentum operators. This is exactly why the many-body problems, exemplified by the action in Eq. 21), are generally non-trivial. The quartic term may be represented by the diagram in Fig. 4. 4. Instead of dealing with the quartic term in Eq. 32) where the average | (r , τ )|2 is to be self-consistently computed.

N α N . 1 Partition function for interacting bosons where i = 1, 2, . . ,n α N are complex. For such a state, αi αi ) n αi , n αi ! 4) and therefore | = ∞ ∞ ··· n α1 =0 ( ˆ α† i )n αi αi a n αi ! n α N =0 i |0 = e αi † ˆ αi αi a |0 . 5) The last expression for the coherent state can easily be seen to satisfy the definition in Eq. 3) by applying the annihilation operator and by using the commutation relation [aˆ αi , (aˆ α† j )n ] = n(aˆ α† i )n−1 δαi ,α j . Note that the coherent state is then a linear combination of states with different numbers of particles.