Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Fermi Liquid without Quasiparticles and Electron Spectral Functions of
  Two-Dimensional High-$T_c$ Superconductors   Properties of strongly correlated two-dimensional (2D) electron systems in
solids are studied on the assumption that these systems undergo a phase
transition, called fermion condensation, whose characteristic feature is
flattening of the electron spectrum $\epsilon({\pf p})$. Unlike the previous
models in the present study, the decay of single-particle states is properly
taken into account. Remarkably, the value of the topological charge ($N=1/2$)
remains unchanged, supporting the view that systems with a fermion condensate
form a separate class of Fermi liquids. Results of calculations are found to be
in qualitative agreement with ARPES data.

25
The categories of this paper are: patt-sol
20
The categories of this paper are: acc-phys
21
The categories of this paper are: adap-org
12
The categories of this paper are: nucl-th
23
The categories of this paper are: solv-int
10
The categories of this paper are: q-bio
24
The categories of this paper are: dg-ga
13
The categories of this paper are: quant-ph
17
The categories of this paper are: q-fin
32
The categories of this paper are: atom-ph
27
The categories of this paper are: comp-gas
8
The categories of this paper are: hep-ex
30
The categories of this paper are: q-alg
31
The categories of this paper are: ao-sci
26
The categories of this paper are: bayes-an
36
The categories of this paper are: cmp-lg