Date:
Thu, 15/12/202210:45-11:45
Location:
https://huji.zoom.us/j/89663253540?pwd=cVN5VnhYaVJUSmV1OUJPaCtFb3I4QT09
Speaker: Daniel Groselj (Columbia University)
Title: Interplay between kinetic plasma physics and radiative effects in sources of high-energy emission
Abstract: High-energy radiation from astrophysical sources is produced in a hot plasma that shines through emission from relativistic charged particles. The energization of particles is mediated by plasma processes, such as kinetic turbulence or collisionless shocks, that convert energy stored in magnetic fields and bulk flows into heat and non-thermal particles. This can be studied using kinetic particle-in-cell (PIC) simulations, which capture the first-principles interaction between particles and their self-consistent fields. Yet, in high-energy sources one generally also needs to consider the effects of intense radiation on the plasma dynamics, which can alter the particle energetics through radiative cooling andtheir composition via production of electron-positron pairs. Here, I will present results of recent PIC simulations and demonstrate some consequences of the interplay between radiative effects and plasma physics based on two examples: (1) collisionless gamma-ray burst (GRB) afterglow shocks enriched with electron-positron pairs, and (2) radiative kinetic turbulence in coronae of accreting black holes. I will comment on the astrophysical implications of these first-principles simulations for models of early GRB afterglows and for models of the hard state in X-ray binaries.
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Title: Interplay between kinetic plasma physics and radiative effects in sources of high-energy emission
Abstract: High-energy radiation from astrophysical sources is produced in a hot plasma that shines through emission from relativistic charged particles. The energization of particles is mediated by plasma processes, such as kinetic turbulence or collisionless shocks, that convert energy stored in magnetic fields and bulk flows into heat and non-thermal particles. This can be studied using kinetic particle-in-cell (PIC) simulations, which capture the first-principles interaction between particles and their self-consistent fields. Yet, in high-energy sources one generally also needs to consider the effects of intense radiation on the plasma dynamics, which can alter the particle energetics through radiative cooling andtheir composition via production of electron-positron pairs. Here, I will present results of recent PIC simulations and demonstrate some consequences of the interplay between radiative effects and plasma physics based on two examples: (1) collisionless gamma-ray burst (GRB) afterglow shocks enriched with electron-positron pairs, and (2) radiative kinetic turbulence in coronae of accreting black holes. I will comment on the astrophysical implications of these first-principles simulations for models of early GRB afterglows and for models of the hard state in X-ray binaries.
──────────
Emanuele Sobacchi is inviting you to a scheduled Zoom meeting.
Join Zoom Meeting
https://huji.zoom.us/j/89663253540?pwd=cVN5VnhYaVJUSmV1OUJPaCtFb3I4QT09
Meeting ID: 896 6325 3540
Passcode: 549046
One tap mobile
+97223764509,,89663253540#,,,,*549046# Israel
+97223764510,,89663253540#,,,,*549046# Israel
Dial by your location
+972 2 376 4509 Israel
+972 2 376 4510 Israel
+972 3 978 6688 Israel
Meeting ID: 896 6325 3540
Passcode: 549046
Find your local number: https://huji.zoom.us/u/kcMDUSQpmr
Join by Skype for Business
https://huji.zoom.us/skype/89663253540
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