BEGIN:VCALENDAR VERSION:2.0 PRODID:researchseminars.org CALSCALE:GREGORIAN X-WR-CALNAME:researchseminars.org BEGIN:VEVENT SUMMARY:Fábio Cruz (GoLP\, Instituto Superior Técnico) DTSTART:20210506T133000Z DTEND:20210506T143000Z DTSTAMP:20260423T021243Z UID:CENTRA/40 DESCRIPTION:Title: First-principles kinetic simulations of pulsar magnetospheres\nby Fáb io Cruz (GoLP\, Instituto Superior Técnico) as part of CENTRA Seminar\n\n \nAbstract\nPulsars gather a wealth of extreme physical conditions\, makin g them unique environments where general relativity\, quantum electrodynam ics\, and plasma physics meet. The electron-positron plasma that partially fills the pulsar magnetosphere is thought to be created via strong Quantu m Electrodynamics (QED) cascades. In each step of this positive feedback p rocess\, electrons and positrons accelerated to TeV energies emit gamma-ra ys that\, in the presence of 10^12 Gauss magnetic fields\, decay into new electron-positron pairs. In this talk\, I will present two classes of full y kinetic particle-in-cell simulations of pulsar magnetospheres. First\, I will show local simulations including the QED processes relevant in pulsa rs from first principles\, and show that plasma waves triggered by QED cas cades can produce coherent electromagnetic waves\, that are strong candida tes for the longstanding problem of pulsar radio emission. Second\, I will present global simulations\, that demonstrate that QED cascades operating up to only a few stellar radii above the central neutron star can provide enough plasma to fill the whole pulsar magnetosphere and trigger dissipat ion at large radii\, consistently with observations. Preliminary results o f simulations of pulsars where general relativity is taken into account wi ll be presented\, and its role in the global dynamics of the magnetosphere will be discussed.\n LOCATION:https://researchseminars.org/talk/CENTRA/40/ END:VEVENT END:VCALENDAR