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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">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">https://stockholmuniversity.zoom.us/j/66204962080</a>
<br>
<br>
Meeting ID: 662 0496 2080
<br>
</p>
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