Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Two particle correlations and orthogonality catastrophe in interacting
  Fermi systems   The wave function of two fermions, repulsively interacting in the presence of
a Fermi sea, is evaluated in detail. We consider large but finite systems in
order to obtain an unabiguous picture of the two-particle correlations. As
recently pointed out by Anderson, in two or lower dimensions the particles may
be correlated even when situated on the Fermi surface. The "partial exclusion
principle" for two particles with opposite spin on the same Fermi point is
discussed, and related to results from the T-matrix approximation. Particles on
different Fermi points are shown to be uncorrelated in dimensions d > 1. Using
the results for the two-particle correlations we find that the orthogonality
effect induced by adding an extra particle to a (tentative) two-dimensional
Fermi liquid is finite.

20
The categories of this paper are: acc-phys
28
The categories of this paper are: alg-geom
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The categories of this paper are: adap-org
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The categories of this paper are: eess
31
The categories of this paper are: ao-sci
2
The categories of this paper are: math
32
The categories of this paper are: atom-ph
12
The categories of this paper are: nucl-th
22
The categories of this paper are: chao-dyn
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The categories of this paper are: cmp-lg
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The categories of this paper are: bayes-an
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The categories of this paper are: dg-ga
3
The categories of this paper are: physics
29
The categories of this paper are: funct-an
6
The categories of this paper are: astro-ph
8
The categories of this paper are: hep-ex