Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: A Time Dependent Local Isospin Density Approximation Study of Asymmetric
  Nuclear Matter   The dynamic response of asymmetric nuclear matter is studied by using a
Time-Dependent Local Isospin Density (TDLIDA) approximation approach.
Calculations are based on a local density energy functional derived by an
Auxiliary Field Diffusion Monte Carlo (AFDMC) calculation of bulk nuclear
matter. Three types of excited states emerge: collective states, a continuum of
quasi-particle-quasi-hole excitations and unstable solutions. These states are
analyzed and discussed for different values of the nuclear density $\rho$ and
isospin asymmetry $\xi=(N-Z)/A$. An analytical expression of the
compressibility as a function of $\rho$ and $\xi$ is derived which show
explicitly an instability of the neutron matter around $\rho\simeq 0.09
fm^{-3}$ when a small fraction of protons is added to the system.

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The categories of this paper are: adap-org
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The categories of this paper are: q-fin
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The categories of this paper are: hep-ex
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The categories of this paper are: physics
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The categories of this paper are: math-ph
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The categories of this paper are: gr-qc
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The categories of this paper are: quant-ph
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The categories of this paper are: math
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The categories of this paper are: nlin
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The categories of this paper are: q-alg
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The categories of this paper are: hep-th
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The categories of this paper are: econ
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The categories of this paper are: funct-an
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The categories of this paper are: alg-geom
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The categories of this paper are: stat
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The categories of this paper are: eess