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<span><span style="font-family: Calibri, Arial, Helvetica, sans-serif; background-color: rgb(255, 255, 255)">Dear all,<br>
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<span style="color: rgb(34, 34, 34); font-family: Arial, Helvetica, sans-serif; font-size: medium; background-color: rgb(255, 255, 255); display: inline !important">Here is a reminder for</span><span style="color: rgb(34, 34, 34); font-family: Arial, Helvetica, sans-serif; font-size: medium; background-color: rgb(255, 255, 255)"> seminars</span><span style="color: rgb(34, 34, 34); font-family: Arial, Helvetica, sans-serif; font-size: medium; background-color: rgb(255, 255, 255)"> </span><span style="color: rgb(34, 34, 34); font-family: Arial, Helvetica, sans-serif; font-size: medium; background-color: rgb(255, 255, 255)"><span><span><span>next</span></span></span></span><span style="color: rgb(34, 34, 34); font-family: Arial, Helvetica, sans-serif; font-size: medium; background-color: rgb(255, 255, 255)"> </span><span style="color: rgb(34, 34, 34); font-family: Arial, Helvetica, sans-serif; font-size: medium; background-color: rgb(255, 255, 255)"><span><span>week</span></span></span><span style="color: rgb(34, 34, 34); font-family: Arial, Helvetica, sans-serif; font-size: medium; background-color: rgb(255, 255, 255); display: inline !important">:</span><br>
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<font size="3"><span style="margin: 0px; font-size: 12pt"><u><b><br>
Theory seminar:</b></u></span><br>
<span style="margin: 0px; font-size: 12pt">Monday, Oct 7, 1:00PM, Room F326</span></font></div>
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<font size="3"><span style="margin: 0px; font-size: 12pt">Alex Kovner (U. Conn), <span>Color Glass condensate density matrix: Lindblad evolution, entanglement entropy, Wigner wave functional and all that.”<br>
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<div><span style="color: rgb(0, 0, 0);">Abstract: </span><br>
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<div><span style="color: rgb(0, 0, 0);">We introduce the notion of the Color Glass Condensate (CGC) density matrix ˆρ. This generalizes the concept of probability density for the distribution of the color charges in the hadronic wave function and is consistent
with understanding the CGC as an effective theory after integration of part of the hadronic degrees of freedom. </span><br>
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<div><span style="color: rgb(0, 0, 0);">We derive the evolution equations for the density matrix and show that the JIMWLK evolution equation arises here as the evolution of diagonal matrix elements of ˆρ in the color charge density basis. We analyze the behavior
of this density matrix under high energy evolution and show that its purity decreases with energy. We show that the evolution equation for the density matrix has the celebrated Kossakowsky-Lindblad form describing the non-unitary evolution of the density matrix
of an open system. Additionally, we consider the dilute limit and demonstrate that, at large rapidity, the entanglement entropy of the density matrix grows linearly with rapidity according to d/dy S = γ, where γ is the leading BFKL eigenvalue. We also discuss
the evolution of ˆρ in the saturated regime and relate it to the Levin-Tuchin law and find that the entropy again grows linearly with rapidity, but at a slower rate. By analyzing the dense and dilute regimes of the full density matrix we are able to establish
a duality between the regimes. Finally we introduce the Wigner functional derived from this density matrix and discuss how it can be used to determine the distribution of color currents, which may be instrumental in understanding dynamical features of QCD
at high energy.</span></div>
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<font size="3"><span style="margin: 0px; font-size: 12pt"><u><b>Cake seminar:</b></u></span><br>
<span style="margin: 0px; font-size: 12pt">Wednesday, Oct 9, 1:00PM, Room L102</span></font></div>
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<span style="font-family: Calibri, Arial, Helvetica, sans-serif; background-color: rgb(255, 255, 255); display: inline !important"><span style="font-family: Calibri, Arial, Helvetica, sans-serif; background-color: rgb(255, 255, 255); display: inline !important">Andrew </span>Jackura, ''Finite-Volume
Matrix Elements of Two-Hadron States''</span><br>
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Abstract:<br>
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A recent formalism has been developed that relates two-hadron infinite-volume form-factors to finite-volume matrix elements, which can be calculated from lattice QCD. I will discuss features of this formalism, as well as various non-trivial checks in order
to gain confidence that all finite-volume corrections are controlled. First, I will show that current conservation ensures the electric charge is independent of finite-volume corrections. Then, I will show that the formalism correctly recovers the form factors
of bound states in the infinite-volume limit, and determine the leading finite-volume corrections. Finally, I will discuss the near threshold limit, and illustrate that it is crucial to use this formalism to avoid being overwhelmed by finite-volume systematics.<span> </span><br>
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<span>Bluej</span><span style="font-size: medium; font-family: Arial, Helvetica, sans-serif">eans connection: </span><span style="font-size: medium; color: rgb(34, 34, 34); font-family: Arial, Helvetica, sans-serif"><a href="https://bluejeans.com/610445877" target="_blank" style="color: rgb(17, 85, 204)"><span style="color: rgb(12, 100, 192)">https://bluejeans.<wbr>com/610445877</span></a></span><span style="font-size: medium; color: rgb(12, 100, 192); font-family: Arial, Helvetica, sans-serif"> </span></div>
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Raza, Miguel, Carlota</div>
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<pre cols="72" style="white-space:pre-wrap">--</pre>
<pre cols="72" style="white-space:pre-wrap">Postdoctoral researcher
Theory Center - Jefferson Lab
12000 Jefferson Avenue,
Newport News, VA 23606 USA
CEBAF center, office A206</pre>
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