Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Di-neutrons in neutron matter within Brueckner-Hartree-Fock approach   We investigate the appearance of di-neutron bound states in pure neutron
matter within the Brueckner-Hartree-Fock approach at zero temperature. We
consider Argonne $v_{18}$ and Paris bare interactions as well as chiral two-
and three-nucleon forces. Self-consistent single-particle potentials are
calculated controlling explicitly singularities in the $g$ matrix associated
with bound states. Di-neutrons are loosely bound, with binding energies below
$1$ MeV, but are unambiguously present for Fermi momenta below $1$ fm$^{-1}$
for all interactions. Within the same framework we are able to calculate and
characterize di-neutron bound states, obtaining mean radii as high as $\sim
110$ fm. The resulting equations of state and mass-radius relations for pure
neutron stars are analyzed including di-neutron contributions.

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The categories of this paper are: supr-con
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The categories of this paper are: hep-ph
19
The categories of this paper are: eess
2
The categories of this paper are: math
28
The categories of this paper are: alg-geom
7
The categories of this paper are: hep-th
21
The categories of this paper are: adap-org
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The categories of this paper are: hep-lat
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The categories of this paper are: stat
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The categories of this paper are: chem-ph
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The categories of this paper are: comp-gas
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The categories of this paper are: dg-ga
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The categories of this paper are: nlin
3
The categories of this paper are: physics
26
The categories of this paper are: bayes-an
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The categories of this paper are: acc-phys