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<!--
Author: The JETSCAPE Collaboration
Date: 2023-04-02
This is the page for JETSCAPE SIMS Working Group.
It shows role, working group members, and links to the group's pages.
-->
<!DOCTYPE html>
<html lang="en">
<head>
<!-- Google tag (gtag.js) -->
<script async src="https://www.googletagmanager.com/gtag/js?id=G-NV11FXRRQX"></script>
<script>
window.dataLayer = window.dataLayer || [];
function gtag(){dataLayer.push(arguments);} gtag('js', new Date());
gtag('config', 'G-NV11FXRRQX');
</script>
<title>Simulations Working Group (SIMS-WG)</title>
<meta charset="utf-8">
<meta name="description" content="JETSCAPE Simulations Working Group">
<meta name="keywords" content="sims, sims working group, simulations">
<meta name="author" content="The JETSCAPE Collaboration" >
<link rel="shortcut icon" type="image/x-icon" href="images/favicon.ico">
<link rel="stylesheet" href="styles/style.css">
</head>
<body>
<div id="containerFlexible">
<!-- header -->
<div class="header">
<a href="index.html">
<img src="images/jetscape_home_logo.jpg" alt="JETSCAPE Logo" class="logo"
></a>
<h1>Simulations Working Group (SIMS-WG)</h1>
</div>
<!-- insert navigation bar -->
<script id="insert_menu" src="scripts/nav.js"></script>
<!-- main content -->
<!-- describe the missions of the SIMS working group -->
<div>
<h2>Role</h2>
<p class="standardFont">
The SIMS Working Group assists in writing, maintaining and running physics and
statistical software for modeling heavy ion collisions, as well
as performing state-of-the-art model-to-data comparisons.
</p>
</div>
<div>
<h2>Publications</h2>
<p class="standardFont">
In 2022, we published <a href="https://inspirehep.net/literature/2053327" target="_blank">"Role of bulk viscosity in deuteron production in ultrarelativistic nuclear collisions"</a>, in which we compared different models for the formation of deuterons in heavy-ion collisions,
and studied the effect of bulk viscosity on the production of deuterons.
</p>
<p class="standardFont">
In <a href="https://inspirehep.net/literature/1821941" target="_blank">"Phenomenological constraints on the transport properties of QCD matter with data-driven model averaging"</a> (published in Physical Review Letter in 2021, and selected as Editors' Suggestion) and in
<a href="https://inspirehep.net/literature/1827929" target="_blank">"Multisystem Bayesian constraints on the transport coefficients of QCD matter"</a> (published in Physical Review C in 2021), we
presented a Bayesian inference on measurements from the RHIC and the LHC.
We obtained state-of-the-art constraints on the shear and bulk viscosities
of QCD, and applied for the first time in heavy ion studies multiple new
concepts of Bayesian inference, including:
</p>
<div>
<ul class="standardFont">
<li>Closure tests</li>
<li>Critical examination of priors</li>
<li>Bayesian model selection</li>
<li>Bayesian model averaging</li>
</ul>
</div>
To make the calculations available to the community, we built a web application where one can visualize easily the effect of the parameters on the different observables:
<div>
<a href="http://eg1.jetscape.wayne.edu/" target="_blank">
<img class="widgetImage" src="images/sims_widget_img.png" alt="SIMS Widget Image">
</a>
</div>
<div>
<p class="caption">
Click on the image to access a widget that shows how each model parameter affects hadronic observables.
</p>
</div>
<!-- <div>
<h2>Presentations</h2>
</div> -->
<div>
<h2>Codes</h2>
<div>
<p class="standardFont">
The code of the multistage model used in the publications discussed above is publicly available here:
</p>
<a target="_blank" href="https://github.com/JETSCAPE/JETSCAPE/tree/sims-xsede-2021">https://github.com/JETSCAPE/JETSCAPE/tree/sims-xsede-2021</a>
<p class="standardFont">
with additional documentation on how to use the code available here:
</p>
<a target="_blank" href="https://github.com/j-f-paquet/sims-event-generator">https://github.com/j-f-paquet/sims-event-generator/</a>
<br>
<br>
<p class="standardFont">
The code used for the Bayesian inference itself (design point generation, emulation, Markov chain Monte Carlo, ...) is also publicly available on Github:
</p>
<a target="_blank" href="https://github.com/j-f-paquet/js-sims-bayes">https://github.com/j-f-paquet/js-sims-bayes</a>
</div>
</div>
</div>
<div>
<h2>Multistage model of heavy-ion collisions used in the 2021-2022 Bayesian inference</h2>
<div>
<img class="simsImage" src="images/TRENTo_01.png" width="1000" alt="Initial Energy Deposition (TRENTO)">
<p class="standardFont simsCaption">
The first stage of the model gives the initial conditions.
<a href="https://github.com/Duke-QCD/trento">TRENTo</a> is a model
that parameterizes the initial energy deposition immediately
following a heavy ion collision.
</p>
</div>
<div>
<img class="simsImage" src="images/TRENTo_02.png" width="1000" alt="Pre-Hydro (Free-Streaming)">
<p class="standardFont simsCaption">
The first dynamical stage of the collision is treated with a
free-streaming approximation. The system expands and cools,
before we match the full energy-momentum tensor to viscous
hydrodynamics.
</p>
</div>
<div>
<img class="simsImage" src="images/TRENTo_03.png" width="1000" alt="Viscous Hydro (MUSIC)">
<p class="standardFont simsCaption">
The second dynamical stage is relativistic viscous
hydrodynamics, solved by
<a href="https://github.com/MUSIC-fluid/MUSIC/tree/sims">MUSIC</a>.
The system continues to expand and cool according to
parameterized transport coefficients and a fixed equation of
state.
</p>
</div>
<div>
<img class="simsImage" src="images/TRENTo_04.png" width="1000" alt="Particlization">
<p class="standardFont simsCaption">
At a switching temperature, the energy-momentum tensor of
hydrodynamics is converted into distributions of hadrons.
The model of “particlization” used are those included in the
<a href="https://github.com/derekeverett/iS3D">iS3D</a>
sampler.
</p>
</div>
<div>
<img class="simsImage" src="images/TRENTo_05.png" width="1000" alt="Hadronic Phase (SMASH)">
<p class="standardFont simsCaption">
<a href="https://smash-transport.github.io/">SMASH</a> is a
model for evolving a system of hadrons according to a coupled
Boltzmann equation. Hadrons can scatter, form resonances and
decay until they finally become completely decoupled.
</p>
</div>
<!-- lists the SIMS group members -->
<h2>Group Members</h2>
<div>
<h3>Conveners</h3>
<ul class="standardFont">
<li>Matthew Luzum (University of São Paulo)</li>
<li>Jean-François Paquet (Vanderbilt University)</li>
</ul>
<h3>Graduate students</h3>
<ul class="standardFont">
<li>Lauren Kasper (Vanderbilt University)</li>
<li>Andi Mankolli (Vanderbilt University)</li>
<li>Derek Soeder (Duke University)</li>
</ul>
<h3>Postdocs</h3>
<ul class="standardFont">
<li>Lipei Du (McGill University)</li>
<li>Mayank Singh (Vanderbilt University)</li>
<li>Xiang-Yu Wu (McGill University)</li>
<li>Wenbin Zhao (Berkeley)</li>
</ul>
<h3>Faculty</h3>
<ul class="standardFont">
<li>Steffen Bass (Duke University)</li>
<li>Charles Gale (McGill University)</li>
<li>Ulrich Heinz (Ohio State University)</li>
<li>Abhijit Majumder (Wayne State University)</li>
<li>Chun Shen (Wayne State University)</li>
<li>Julia Velkovska (Vanderbilt University)</li>
<li>Gojko Vujanovic [Convener: 2018-2021] (University of Regina)</li>
</ul>
<h3>Alumni</h3>
<ul class="standardFont">
<li>Dan Liyanage (Ohio State University, graduated 2023)</li>
<li>Matthew Heffernan (McGill University, graduated 2022)</li>
<li>Derek Everett (Ohio State University, graduated 2021)</li>
<li>Weiyao Ke (now faculty at Central China Normal University)</li>
</ul>
</div>
</div>
<!-- insert footer -->
<script id="insert_footer" src="scripts/foot.js"></script>
</div>
</body>