Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: The Fermi Edge Singularity and Boundary Condition Changing Operators   The boundary conformal field theory approach to quantum impurity problems is
used to study the Fermi edge singularity, occuring in the X-ray adsorption
probablility. The deep-hole creation operator, in the effective low-energy
theory, changes the boundary condition on the conduction electrons. By a
conformal mapping, the dimension of such an operator is related to the
groundstate energy for a finite system with different boundary conditions at
the two ends. The Fermi edge singularity is solved using this method, for the
Luttinger liquid including back-scattering and for the multi-channel Kondo
problem.

31
The categories of this paper are: ao-sci
2
The categories of this paper are: math
0
The categories of this paper are: hep-ph
1
The categories of this paper are: cs
21
The categories of this paper are: adap-org
14
The categories of this paper are: math-ph
33
The categories of this paper are: plasm-ph
35
The categories of this paper are: mtrl-th
37
The categories of this paper are: supr-con
19
The categories of this paper are: eess
36
The categories of this paper are: cmp-lg
12
The categories of this paper are: nucl-th
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The categories of this paper are: hep-lat
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The categories of this paper are: nucl-ex
8
The categories of this paper are: hep-ex
9
The categories of this paper are: nlin