Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: The role of tensor force in nuclear matter saturation   Using a relativistic Dirac-Brueckner analysis the pion contribution to the
ground state energy of nuclear matter is studied. Evidence is presented that
the role of the tensor force in the saturation mechanism is substantially
reduced compared to its dominant role in a usual non-relativistic treatment.
The reduction of the pion contribution in nuclear matter is due to many-body
effects present in a relativistic treatment. In particular, we show that the
damping of OPEP is actually due to the decrease of $M^*/M$ with increasing
density.

11
The categories of this paper are: hep-lat
6
The categories of this paper are: astro-ph
5
The categories of this paper are: gr-qc
14
The categories of this paper are: math-ph
3
The categories of this paper are: physics
25
The categories of this paper are: patt-sol
17
The categories of this paper are: q-fin
9
The categories of this paper are: nlin
35
The categories of this paper are: mtrl-th
0
The categories of this paper are: hep-ph
19
The categories of this paper are: eess
32
The categories of this paper are: atom-ph
2
The categories of this paper are: math
20
The categories of this paper are: acc-phys
30
The categories of this paper are: q-alg
7
The categories of this paper are: hep-th