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<div id="magicdomid353" class="ace-line" style="padding-right: 1px;"><span class="" style="cursor: auto; padding-top: 0px; padding-bottom: 1px;">Dear colleagues, </span></div>
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<div id="magicdomid355" class="ace-line" style="padding-right: 1px;"><span class="" style="cursor: auto; padding-top: 0px; padding-bottom: 1px;">This is a reminder for our next EO meeting next Thursday </span><span class="b" style="cursor: auto; padding-top: 0px; padding-bottom: 1px;"><b class="">29th
of September at 13:15</b></span><span class="" style="cursor: auto; padding-top: 0px; padding-bottom: 1px;"> (CEST). The speaker is Federico Schianchi talking about his work on neutron stars mergers. He is visiting Evan's O'Connor's group during this week.</span></div>
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<div id="magicdomid357" class="ace-line" style="padding-right: 1px;"><span class="" style="cursor: auto; padding-top: 0px; padding-bottom: 1px;">The meeting will be fully in person unless personal request. This time the meeting will take place at the commom
area of the astronomy department in </span><span class="b" style="cursor: auto; padding-top: 0px; padding-bottom: 1px;"><b class="">Albano Hus 3 Plan 4. </b></span></div>
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<div id="magicdomid359" class="ace-line" style="padding-right: 1px;"><span class="" style="cursor: auto; padding-top: 0px; padding-bottom: 1px;">Following the title and the abstract:</span></div>
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<div id="magicdomid372" class="ace-line" style="padding-right: 1px;"><span class="b i" style="cursor: auto; padding-top: 0px; padding-bottom: 1px;"><b class=""><i class="">Implementation of first-order multipolar radiation transport in Numerical Relativity
code BAM</i></b></span></div>
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<div id="magicdomid374" class="ace-line" style="padding-right: 1px;"><i class=""><span class="i" style="cursor: auto; padding-top: 0px; padding-bottom: 1px;">Numerical-relativistic simulations of binary neutron star mergers have a key role in Multimessenger
Astronomy, e.g., for modeling gravitational and electromagnetic emissions connected to those events. For an accurate description of electromagnetic counterparts, one needs to know the properties of the matter ejected during and shortly after the merger. Inside
this material, heavy elements are synthesized depending on the electron fraction of the outflowing matter. The radioactive decay of these elements produce an observable thermal emission that takes the name of Kilonova. All these phenomena are highly dependent
on weak interactions between baryons and neutrinos.My work consists of implementing a code that tracks the propagation of such particles and their interaction with matter. It will be part of our Numerical Relativity code BAM. The aim is to get a more accurate
estimate of the ejecta properties, mostly of the electron fraction. Recent studies revealed that neutrino emission/absorption also influences the mass and velocity of the ejected material.The scheme is based on a first-order multipolar (M1) transport equation.
It consists of evolving the energy and momentum densities of neutrinos without solving a full and too expensive Boltzmann equation.The advantage of transport formalisms with respect to the Leakage scheme currently implemented in BAM is the possibility to take
into account for the neutrinos to be reab</span>sorbed by the fluid in another point of the simulation domain, with transfer of energy, momentum and lepton number. Due to the already high computational cost of binary neutron star merger simulations spectral
transport schemes are not affordable. We have then to opt for a grey M1 scheme, i.e, we only evolve energy integrated quantities, loosing information on the neutrinos spectrum.Because of this reason the implementation of a more sophisticated scheme like a
Monte Carlo transport would be important for the future.</i></div>
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<div id="magicdomid368" class="ace-line" style="padding-right: 1px;"><span class="" style="cursor: auto; padding-top: 0px; padding-bottom: 1px;">Looking forward to see you all, </span></div>
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<div id="magicdomid370" class="ace-line" style="padding-right: 1px;"><span class="" style="cursor: auto; padding-top: 0px; padding-bottom: 1px;">Kind regards,</span></div>
<div id="magicdomid371" class="ace-line" style="padding-right: 1px;"><span class="" style="cursor: auto; padding-top: 0px; padding-bottom: 1px;">Ana Sagués Carracedo & Haakon Andresen</span></div>
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