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VERSION:2.0
CALSCALE:GREGORIAN
PRODID:UW-Madison-Physics-Events
BEGIN:VEVENT
SEQUENCE:2
UID:UW-Physics-Event-9527
DTSTART:20261016T203000Z
DTEND:20261016T213000Z
DTSTAMP:20260823T230542Z
LAST-MODIFIED:20260819T195328Z
LOCATION:Chamberlin 2241
SUMMARY:Neutron Stars Are Plastic\, Physics Department Colloquium\, Ma
 tt Caplan\, Illinois State University
DESCRIPTION: Neutron star crusts are weird. They are fully ionized pla
 smas of nuclei at densities reaching 10^14 g/cm^3\, but under such hig
 h pressure that they freeze into a crystal solid. The elastic properti
 es of this solid are especially important for understanding crust brea
 king and transients in magnetar outbursts and starquakes\, but this ma
 terial cannot break like terrestrial solids due to the high pressure s
 uppressing the formation of fractures and voids. Fortunately\, large s
 cale molecular dynamics simulations make it possible to study breaking
 \, plastic flow\, and other behavior beyond linear elasticity. I will 
 present our new molecular dynamics simulations demonstrating that neut
 ron star crusts likely have very simple elastic-perfectly plastic rheo
 logy\, with many strong analogs to terrestrial materials. If perfect c
 rusts experience brittle failure and flow plastically before reanneali
 ng\, it's possible that neutron star crusts experience 'cycling' with 
 implications for magnetar outbursts.
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URL:https://www.physics.wisc.edu/events/?id=9527
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