[Phys-seminars] 2017-06-14 Astrophysics and Cosmology Seminar

griv griv at bgu.ac.il
Mon Jun 12 11:32:43 IDT 2017


Astrophysics and Cosmology Seminar

 DATE: 14-06-17

 TIME: 11:15

 PLACE: Seminar Room 207, Building 54 (Physics)

TITLE: 
Particle Acceleration and Radiation in Pulsars

SPEAKER: 
Dr. Benoit Cerutti, (Institut de Planetologie et d\'Astrophysique de Grenoble)

ABSTRACT/COMMENTS: 
Pulsars shine throughout the electromagnetic spectrum, from radio waves to energetic gamma rays, but the origin of the emitted radiation is still poorly understood. The recent development of global particle-in-cell (PIC) simulations allows, for the first time, to address this problem from first principles and self-consistently. Three-dimensional radiative PIC simulations show that the equatorial current sheet forming in the pulsar wind is the main site of particle acceleration, instead of electrostatic gaps within the co-rotating magnetosphere as usually assumed. Relativistic reconnection dissipates magnetic energy which is then efficiently channeled into energetic particles and high-energy synchrotron radiation. Synthetic lightcurves, spectra and polarization present robust features reminiscent of observed gamma-ray pulsars. PIC simulations also suggest that general relativistic effects are essential to ignite pair creation at the star polar-cap, which may power the radio em
 ission.


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