Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Ground-state Correlation Effects in Extended RPA Calculations   We study normalization problems associated with use of perturbatively
correlated ground-states in extended RPA schemes in the context of a specific
but typical example. The sensitivity of the results to the amount of $2p2h$
admixtures to the correlated ground state is also investigated in terms of a
modification of the standard perturbative approach.

4
The categories of this paper are: cond-mat
17
The categories of this paper are: q-fin
37
The categories of this paper are: supr-con
0
The categories of this paper are: hep-ph
32
The categories of this paper are: atom-ph
16
The categories of this paper are: stat
30
The categories of this paper are: q-alg
8
The categories of this paper are: hep-ex
27
The categories of this paper are: comp-gas
35
The categories of this paper are: mtrl-th
13
The categories of this paper are: quant-ph
1
The categories of this paper are: cs
11
The categories of this paper are: hep-lat
33
The categories of this paper are: plasm-ph
15
The categories of this paper are: nucl-ex
3
The categories of this paper are: physics