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<p>Reminder, Eliot is talking in 23 min</p>
<p>C<br>
</p>
<div class="moz-cite-prefix">On 29/11/2021 15:59, Chris Usher wrote:<br>
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cite="mid:1c4d9f66-1e5c-baf4-eb50-19e159f37568@astro.su.se">
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<p>Hello</p>
<p>On Friday the 3rd at 10:30 we have our next astronomy seminar
with Eliot Ayache (Stockholm University) via Zoom.<br>
</p>
<div class=""><b class="">The Numerics of Gamma-ray
Burst Afterglows Across Scales</b><br class="">
<br class="">
Gamma-ray burst (GRB) afterglows are riddled with multiscale
processes in the spatial, temporal, and spectral domains.
Accurately capturing the interplay between these processes, and
their manifestations at short and long timescales, is the key
to uncovering the nature and behavior of the associated
progenitor and remnant. I will first focus on direct modeling
and show how recent improvements in the treatment of the
numerical dynamics, using moving meshes, allow us to
correctly, numerically, simulate radiative cooling from
non-thermal processes inside the jet. This finally allows
for full broadband simulation of time-dependent synchrotron
emission in relativistic transients. I will then present results
showing how these simulations open the door to the study of
complex dynamical behaviors with multiple emission sites
(and the associated short-timescale light curve variability), as
well as the investigation of the microphysical processes at play
inside the jet in the trans-relativistic regime (and the
associated late-time effects on the light curve). I will
conclude by focusing on the inverse problem and present
preliminary results on how state-of-the-art unsupervised machine
leaning techniques can provide physical insight into the
long-timescale behavior of GRB afterglows.</div>
<div class="">
<p>We are trying something new this year with leaving the Zoom
call open after the formal hour of the seminar is up to allow
the speaker, if they wish, to chat informally with anyone who
is interested.</p>
<p>Thanks<br>
<br>
Chris and Tine</p>
<p>Christopher Usher is inviting you to a scheduled Zoom
meeting. <br>
<br>
Topic: Astronomy Department Seminar - Eliot Ayache <br>
Time: Dec 3, 2021 10:30 AM Stockholm <br>
<br>
Join Zoom Meeting <br>
<a class="moz-txt-link-freetext"
href="https://stockholmuniversity.zoom.us/j/69591012819?pwd=dExIT1hCNjgxNVNZaktMRzBaOXNmUT09"
moz-do-not-send="true">https://stockholmuniversity.zoom.us/j/69591012819?pwd=dExIT1hCNjgxNVNZaktMRzBaOXNmUT09</a>
<br>
<br>
Meeting ID: 695 9101 2819 <br>
Passcode: Mq46qc86Jc </p>
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