AI Article Synopsis
- Mountains on rapidly rotating neutron stars can emit significant gravitational waves, and their size is determined by the strength of the neutron star's crust.
- Simulations indicate that pure single crystal structures have a high breaking strain, and the presence of impurities and defects only slightly reduces it to around 0.1.
- The strength of the neutron star crust may allow for the formation of large mountains that impact the spin periods of certain stars, which may be detectable by large-scale interferometers, and could also provide insights into phenomena like magnetar flares.
Article Abstract
Mountains on rapidly rotating neutron stars efficiently radiate gravitational waves. The maximum possible size of these mountains depends on the breaking strain of the neutron star crust. With multimillion ion molecular dynamics simulations of Coulomb solids representing the crust, we show that the breaking strain of pure single crystals is very large and that impurities, defects, and grain boundaries only modestly reduce the breaking strain to around 0.1. Because of the collective behavior of the ions during failure found in our simulations, the neutron star crust is likely very strong and can support mountains large enough so that their gravitational wave radiation could limit the spin periods of some stars and might be detectable in large-scale interferometers. Furthermore, our microscopic modeling of neutron star crust material can help analyze mechanisms relevant in magnetar giant flares and microflares.
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| http://dx.doi.org/10.1103/PhysRevLett.102.191102 | DOI Listing |
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