English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Plus monthly

Global: Zendy Tools annual

Global: Zendy Tools monthly

Global: Zendy Free Plan

Measurements of the gravitational-wave signals from neutron star mergersallow scientists to learn about the interior of neutron stars and theproperties of dense nuclear matter. The study of neutron star mergers isusually performed with computational fluid dynamics codes, mostly in Eulerianbut also in Lagrangian formulation such as smoothed particle hydrodynamics(SPH). Codes include our best knowledge of nuclear matter in the form of anequation of state as well as effects of general relativity (GR). However, oneimportant aspect of neutron stars is usually ignored: the solid nature of theircrust. The solid matter in the crust is the strongest material known in naturewhich could lead to a multitude of possible observational effects that have notbeen studied in dynamical simulations yet. The crust could change the way aneutron star deforms during a merger, leaving an imprint in the gravitationalwave signal. It could even shatter during the inspiral, producing a potentiallyobservable electromagnetic signal. Here, we present a first study of thedynamical behavior of neutron stars with a solid crust and fixed GR backgroundwith FleCSPH. FleCSPH is a general-purpose SPH code, developed at Los AlamosNational Laboratory. It features an efficient algorithm for gravitationalinteractions via the Fast Multipole Method, which, together with theimplemented nuclear equation of state, makes it appropriate for astrophysicalapplications. The solid material dynamics is described via theelastic-perfectly plastic model with maximum-strain breaking. Despite itssimplicity, the model reproduces the stress-strain curve of crustal material asextracted from microphysical simulations very well. We present first tests ofour implementation via simulations of neutron star oscillations and give anoutlook on our study of the dynamical behavior of the solid crust in neutronstar merger events.

Modeling Neutron Star Oscillations in a Fixed General Relativistic Background Including Solid Crust Dynamics