Physics – High Energy Physics – High Energy Physics - Theory
Scientific paper
1996-11-09
Int.J.Mod.Phys.B12:1379-1396,1998
Physics
High Energy Physics
High Energy Physics - Theory
17 pages LaTex; to be published in the Proceedings of RG '96, Dubna
Scientific paper
10.1142/S0217979298000788
The advantages of using more than one renormalization group (RG) in problems with more than one important length scale are discussed. It is shown that: i) using different RG's can lead to complementary information, i.e. what is very difficult to calculate with an RG based on one flow parameter may be much more accessible using another; ii) using more than one RG requires less physical input in order to describe via RG methods the theory as a function of its parameters; iii) using more than one RG allows one to solve problems with more than one diverging length scale. The above points are illustrated concretely in the context of both particle physics and statistical physics using the techniques of environmentally friendly renormalization. Specifically, finite temperature $\lambda\phi^4$ theory, an Ising-type system in a film geometry, an Ising-type system in a transverse magnetic field, the QCD coupling constant at finite temperature and the crossover between bulk and surface critical behaviour in a semi-infinite geometry are considered.
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