dorsal/arxiv
View SchemaDynamical response of the nuclear pasta in neutron star crusts
| Authors | C. J. Horowitz, M. A. Pérez-García, D. K. Berry, J. Piekarewicz |
|---|---|
| Categories | |
| ArXiv ID | nucl-th/0508044 |
| URL | https://arxiv.org/abs/nucl-th/0508044 |
| DOI | 10.1103/PhysRevC.72.035801 |
| Journal | Phys.Rev. C72 (2005) 035801 |
Abstract
The nuclear pasta -- a novel state of matter having nucleons arranged in a variety of complex shapes -- is expected to be found in the crust of neutron stars and in core-collapse supernovae at subnuclear densities of about $10^{14}$ g/cm$^3$. Due to frustration, a phenomenon that emerges from the competition between short-range nuclear attraction and long-range Coulomb repulsion, the nuclear pasta displays a preponderance of unique low-energy excitations. These excitations could have a strong impact on many transport properties, such as neutrino propagation through stellar environments. The excitation spectrum of the nuclear pasta is computed via a molecular-dynamics simulation involving up to 100,000 nucleons. The dynamic response of the pasta displays a classical plasma oscillation in the 1-2 MeV region. In addition, substantial strength is found at low energies. Yet this low-energy strength is missing from a simple ion model containing a single-representative heavy nucleus. The low-energy strength observed in the dynamic response of the pasta is likely to be a density wave involving the internal degrees of freedom of the clusters.
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"abstract": "The nuclear pasta -- a novel state of matter having nucleons arranged in a\nvariety of complex shapes -- is expected to be found in the crust of neutron\nstars and in core-collapse supernovae at subnuclear densities of about\n$10^{14}$ g/cm$^3$. Due to frustration, a phenomenon that emerges from the\ncompetition between short-range nuclear attraction and long-range Coulomb\nrepulsion, the nuclear pasta displays a preponderance of unique low-energy\nexcitations. These excitations could have a strong impact on many transport\nproperties, such as neutrino propagation through stellar environments. The\nexcitation spectrum of the nuclear pasta is computed via a molecular-dynamics\nsimulation involving up to 100,000 nucleons. The dynamic response of the pasta\ndisplays a classical plasma oscillation in the 1-2 MeV region. In addition,\nsubstantial strength is found at low energies. Yet this low-energy strength is\nmissing from a simple ion model containing a single-representative heavy\nnucleus. The low-energy strength observed in the dynamic response of the pasta\nis likely to be a density wave involving the internal degrees of freedom of the\nclusters.",
"arxiv_id": "nucl-th/0508044",
"authors": [
"C. J. Horowitz",
"M. A. P\u00e9rez-Garc\u00eda",
"D. K. Berry",
"J. Piekarewicz"
],
"categories": [
"nucl-th",
"astro-ph"
],
"doi": "10.1103/PhysRevC.72.035801",
"journal_ref": "Phys.Rev. C72 (2005) 035801",
"title": "Dynamical response of the nuclear pasta in neutron star crusts",
"url": "https://arxiv.org/abs/nucl-th/0508044"
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