The Elasticity of Nuclear Pasta

Abstract

The elastic properties of neutron star crusts are relevant for a variety of currently observable or near-future electromagnetic and gravitational wave phenomena. These phenomena may depend on the elastic properties of nuclear pasta found in the inner crust. We present large scale classical molecular dynamics simulations where we deform nuclear pasta. We simulate idealized samples of nuclear pasta and describe their breaking mechanism. We also deform nuclear pasta that is arranged into many domains, similar to what is known for the ions in neutron star crusts. Our results show that nuclear pasta may be the strongest known material, perhaps with a shear modulus of $10^{30}{\text{ergs/cm}}^3$ and breaking strain greater than 0.1.

arXiv comment5 pages, 2 figures. Submitted to Physical Review Letters

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• Ultrasoft classical systems at zero temperature
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• Anomalous thermal relaxation in warm ion plasmas
• Continuous gravitational waves from thermal mountains on accreting neutron stars: effect of the nuclear pasta phase