Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2004-03-23
Physics
High Energy Physics
High Energy Physics - Phenomenology
14 pages, corrected the normalization of the fermion condensate in section V, corrected a typo in the references
Scientific paper
We review the phase structure of a three-dimensional, non-compact Abelian gauge theory (QED3) as a function of the number $N$ of 4-component massless fermions. There is a critical $N_{c}$ up to which there is dynamical fermion mass generation and an associated global symmetry breaking. We discuss various approaches to the determination of $N_c$, which lead to estimates ranging from $N_c =1$ to $N_c =4$. This theory with N=2 has been employed as an effective continuum theory for the 2D quantum antiferromagnet where the observed Neel ordering corresponds to dynamical fermion mass generation. Thus the value of $N_c$ is of some physical interest. We also consider the phase structure of the model with a finite gauge boson mass (the Abelian Higgs model).
Appelquist Thomas
Wijewardhana L. C. R.
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