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<p>Since there is a bunch of students who look like they are sitting
an exam in FC61, Aurore will now be speaking from Aina Elvius
(C6:1038) and on the same Zoom link.</p>
<p>C<br>
</p>
<div class="moz-cite-prefix">On 23/05/2022 16:03, Chris Usher wrote:<br>
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<blockquote type="cite"
cite="mid:71900a2b-a30d-c44f-54ff-f7d32e842786@astro.su.se">
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<p>On <b>Wednesday</b> May 25th at 10:30 in FC 61 and on Zoom
Aurore Betranhandy (Stockholm) will be giving a seminar on her
thesis work. Please note the unusual day due to the klämdag on
Friday. <br>
</p>
<p><b>Neutrino interactions and axion emission impact on
core-collapse supernova simulations</b></p>
<p>Core-Collapse Supernovae (CCSNe) are important phenomena in the
scope of nucleosynthesis and, as the final stage of massive
stars’ life, they are key processes in the understanding of
stellar evolution. They also are the birthplace of neutron stars
and black holes, therefore they play a major role in the
modelling and understanding of compact object mergers. While
CCSNe have been observed for a long time, it is mainly through
electromagnetic radiation. This channel gives us precious
information about the explosion energy and nucleosynthesis, but
fails to inform us about the collapse and initial explosion
mechanism. While other observational channels are becoming
available, through neutrino detection and gravitational waves,
we are still waiting for a galactic CCSN to get an appropriate
signal giving us insight on the explosion mechanism. We,
therefore, have to rely on simulations for now. CCSN simulations
have been performed for 60 years, improving decade after decade,
and are now able to produce systematic self-consistent
explosions. Several parameters impact the final outcome of our
simulations, originating from different physics treatments, such
as the gravity, neutrino transport and interactions,
micro-physics through the equation of state, or magnetic fields.
To understand the explosion mechanism behind a CCSN, we need to
study the impact of each of these uncertain pieces of physics.
In this thesis, I focused on the impact of the emission of
heavy-lepton neutrinos and axions on the explosion, concentrated
on the early proto-neutron star cooling. I explain details of
the CCSN process, as well as some of the particle physics I
focused on. I show how a change in heavy-lepton neutrino and
axion emissions can accelerate the early proto-neutron star
cooling and subsequently help the explosion.</p>
<p>The schedule of upcoming seminars can be found here: <a
class="moz-txt-link-freetext"
href="https://ttt.astro.su.se/ical/astro-seminars.ics"
moz-do-not-send="true">https://ttt.astro.su.se/ical/astro-seminars.ics</a><br>
</p>
<p>Thanks<br>
Chris and Carolina<br>
</p>
<p>Christopher Usher is inviting you to a scheduled Zoom meeting.
<br>
<br>
Topic: Seminar - Aurore Betranhandy <br>
Time: May 25, 2022 10:30 AM Stockholm <br>
<br>
Join Zoom Meeting <br>
<a class="moz-txt-link-freetext"
href="https://stockholmuniversity.zoom.us/j/66204962080"
moz-do-not-send="true">https://stockholmuniversity.zoom.us/j/66204962080</a>
<br>
<br>
Meeting ID: 662 0496 2080 <br>
</p>
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