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<p class="MsoPlainTextCxSpFirst"><span style="font-size:11.0pt">Please take note of Colloquium taking place today, Tuesday, May 22, 2012 at 4:00 PM in The Robert Smith Seminar Room. There will be a reception in the Atrium at 3:45 PM. Details concerning the
talk are as follows:<o:p></o:p></span></p>
<p class="MsoPlainTextCxSpMiddle"><span style="font-size:11.0pt"><o:p> </o:p></span></p>
<p class="MsoPlainTextCxSpMiddle"><span style="font-size:11.0pt">Speaker: Yuri Kovchegov – The Ohio State University<o:p></o:p></span></p>
<p class="MsoPlainTextCxSpMiddle"><span style="font-size:11.0pt">Date: Tuesday, May 22, 2012<o:p></o:p></span></p>
<p class="MsoPlainTextCxSpMiddle"><span style="font-size:11.0pt">Time: 4:00 PM<o:p></o:p></span></p>
<p class="MsoPlainTextCxSpMiddle"><span style="font-size:11.0pt">Place: The Robert Smith Seminar Room<o:p></o:p></span></p>
<p class="MsoPlainTextCxSpLast"><span style="font-size:11.0pt">Title:
<a href="https://www.physics.ohio-state.edu/news/pollack.php"><span style="color:black">Are</span></a> Heavy Ion Collisions Strongly or Weakly Coupled?<o:p></o:p></span></p>
<p style="margin:0in;margin-bottom:.0001pt;mso-add-space:auto"><span style="font-size:11.0pt;font-family:"Georgia","serif"">Abstract:
</span><span style="font-size:11.0pt;font-family:"Georgia","serif"">I will review our recent efforts to understand the physics of heavy ion collisions, which resulted in the following conundrum. On the one hand, many of the observables, such as the number of
particles produced in the collision, are best described by the weakly-coupled calculations in quantum chromodynamics (QCD), based on Feynman diagrams. On the other hand, another large number of observables, including the observable called "elliptic flow",
are well-described by hydrodynamic simulations with a low specific shear viscosity, as expected for a strongly-coupled medium from the calculations based on Anti-de Sitter/Conformal Field Theory (AdS/CFT) correspondence. This raises a question: are the heavy
ion collisions strongly or weakly coupled? I will present my take on the possible resolution of this conundrum.
<o:p></o:p></span></p>
<p style="margin:0in;margin-bottom:.0001pt"><span style="font-size:10.5pt;font-family:"Georgia","serif""><o:p> </o:p></span></p>
<p class="MsoPlainText">The website for the Colloquium is <a href="https://www.physics.ohio-state.edu/news/colloquium.php">
https://www.physics.ohio-state.edu/news/colloquium.php</a><o:p></o:p></p>
<p class="MsoPlainText"><o:p> </o:p></p>
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