Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: The hard-sphere model of strongly interacting fermion systems   The formalism based on Correlated Basis Functions (CBF) and the
cluster-expansion technique has been recently employed to derive an effective
interaction from a realistic nuclear Hamiltonian. One of the main objectives of
the work described in this Thesis is establishing the accuracy of this novel
approach--that allows to combine the flexibility of perturbation theory in the
basis of eigenstates of the noninteracting system with a realistic description
of short-range correlations in coordinate space--by focusing on the hard-sphere
fermion system.
  As a first application of the formalism, the quasiparticle properties of hard
spheres of degeneracy four have been determined from the two-point Green's
function. The calculation has been performed carrying out a perturbative
expansion of the self-energy, up to the second order in the CBF effective
interaction. The main results of this study are the momentum distributions, the
quasiparticle spectra and their description in terms of effective mass.
  The investigation of the hard-sphere fermion fluid has been extended to study
the shear viscosity and thermal conductivity coefficients of the system with
degeneracy two, that can be regarded as a model of pure neutron matter. The
resulting transport coefficients show a strong sensitivity to the quasiparticle
effective mass, reflecting the effect of second order contributions to the
self-energy which are not taken into account in nuclear matter studies
available in the literature. The difference between first and second order
results is likely to play an important role in astrophysical applications and
needs to be carefully investigated extending our analysis to nuclear matter.

5
The categories of this paper are: gr-qc
0
The categories of this paper are: hep-ph
36
The categories of this paper are: cmp-lg
28
The categories of this paper are: alg-geom
8
The categories of this paper are: hep-ex
15
The categories of this paper are: nucl-ex
10
The categories of this paper are: q-bio
37
The categories of this paper are: supr-con
32
The categories of this paper are: atom-ph
14
The categories of this paper are: math-ph
24
The categories of this paper are: dg-ga
2
The categories of this paper are: math
13
The categories of this paper are: quant-ph
11
The categories of this paper are: hep-lat
30
The categories of this paper are: q-alg
35
The categories of this paper are: mtrl-th