Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Supersymmetry and Theory of Heavy-Fermions   We propose a new approach to the Kondo lattice in order to describe
simultaneously the Kondo effect and the local magnetism. This approach relies
on an original representation of the $S=1/2$ impurity spin in which the
different degrees of freedom are represented by fermionic as well as bosonic
variables. The magnetic instability is found at $J_c/D =0.67$ in definite
improvement compared to usual fermionic mean- field theories. The dynamical
susceptibility contains an inelastic peak in addition to the standard
Lindhard-type Fermi liquid contribution. The Fermi surface sum rule includes
$n_c+1$ states corresponding to large Fermi surfaces.

7
The categories of this paper are: hep-th
11
The categories of this paper are: hep-lat
2
The categories of this paper are: math
19
The categories of this paper are: eess
15
The categories of this paper are: nucl-ex
10
The categories of this paper are: q-bio
30
The categories of this paper are: q-alg
3
The categories of this paper are: physics
14
The categories of this paper are: math-ph
12
The categories of this paper are: nucl-th
8
The categories of this paper are: hep-ex
32
The categories of this paper are: atom-ph
26
The categories of this paper are: bayes-an
29
The categories of this paper are: funct-an
5
The categories of this paper are: gr-qc
1
The categories of this paper are: cs