Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Recent Progress in Quantum Hadrodynamics   Quantum hadrodynamics (QHD) is a framework for describing the nuclear
many-body problem as a relativistic system of baryons and mesons. Motivation is
given for the utility of such an approach and for the importance of basing it
on a local, Lorentz-invariant lagrangian density. Calculations of nuclear
matter and finite nuclei in both renormalizable and nonrenormalizable,
effective QHD models are discussed. Connections are made between the effective
and renormalizable models, as well as between relativistic mean-field theory
and more sophisticated treatments. Recent work in QHD involving nuclear
structure, electroweak interactions in nuclei, relativistic transport theory,
nuclear matter under extreme conditions, and the evaluation of loop diagrams is
reviewed.

32
The categories of this paper are: atom-ph
11
The categories of this paper are: hep-lat
22
The categories of this paper are: chao-dyn
24
The categories of this paper are: dg-ga
15
The categories of this paper are: nucl-ex
6
The categories of this paper are: astro-ph
13
The categories of this paper are: quant-ph
20
The categories of this paper are: acc-phys
19
The categories of this paper are: eess
29
The categories of this paper are: funct-an
33
The categories of this paper are: plasm-ph
10
The categories of this paper are: q-bio
28
The categories of this paper are: alg-geom
21
The categories of this paper are: adap-org
7
The categories of this paper are: hep-th
26
The categories of this paper are: bayes-an