Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Effective Theories of Dense and Very Dense Matter   In these lectures we discuss the uses of effective field theory in studying
dense hadronic matter. We focus on two regimes in the phase diagram. At low
baryon density nucleons can be described as non-relativistic point particles
interacting via short range forces. Interesting effects arise because of the
large nucleon-nucleon scattering length. At very large density QCD matter can
be described in terms of quarks and gluons. Unusual many body effects arise
because of long range gluons fields, and because of the way color and flavor
get entangled in the superconducting state.

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The categories of this paper are: hep-th
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The categories of this paper are: math-ph
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The categories of this paper are: q-bio
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The categories of this paper are: cmp-lg
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The categories of this paper are: econ
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The categories of this paper are: math
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The categories of this paper are: gr-qc
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The categories of this paper are: acc-phys
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The categories of this paper are: hep-lat
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The categories of this paper are: astro-ph
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The categories of this paper are: chem-ph
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The categories of this paper are: hep-ph
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The categories of this paper are: solv-int
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The categories of this paper are: adap-org
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The categories of this paper are: funct-an
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The categories of this paper are: stat