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<p>Hey everyone,</p>
<p>We will be having an <b>in-person</b> Cake Seminar<b> today at
1pm</b><b>. </b>Please join us<b> in L102</b>. Below is the
info</p>
<p>Speaker: Kiminad Mamo (UConn/JLab)</p>
<div style="font-family: Aptos, Aptos_EmbeddedFont, Aptos_MSFontService, Calibri, Helvetica, sans-serif; color: rgb(0, 0, 0);" class="elementToProof"><span style="font-size: 14pt;">Title:
Subsystem QCD: Reduced Density Matrices and Entanglement Entropy
in Hadron States</span></div>
<div style="font-family: Aptos, Aptos_EmbeddedFont, Aptos_MSFontService, Calibri, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0);" class="elementToProof"> <br>
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<div style="font-family: Aptos, Aptos_EmbeddedFont, Aptos_MSFontService, Calibri, Helvetica, sans-serif; color: rgb(0, 0, 0);" class="elementToProof"> <span style="font-size: 14pt;">Abstract: </span></div>
<div style="font-family: Aptos, Aptos_EmbeddedFont, Aptos_MSFontService, Calibri, Helvetica, sans-serif; color: rgb(0, 0, 0);" class="elementToProof"> <span style="font-size: 14pt;">I present
a subsystem formulation of QCD in which a spatial region defines
a reduced density matrix, such that statements about "what is
inside'' are posed strictly in terms of that reduced state. I
also provide a <i>Euclidean</i> path-integral representation
thereof. I then apply this subsystem viewpoint to entanglement.
For a spherical region of radius R, the modular Hamiltonian has
a thermal interpretation with an effective entanglement
temperature T_ent=1/(2pi R). In this language, 3D Breit-frame
EMT profiles -- often used to infer pressure and shear from
gravitational form factors --enter as mechanical response
coefficients, while the entanglement itself remains
intrinsically dependent on R. This clarifies how EMT "pressure''
extracted from Breit-frame profiles should be interpreted,
without promoting Breit images to probability densities. I close
with remarks on how this subsystem/entanglement viewpoint can be
used as a confinement diagnostic.</span></div>
<p>Best wishes,<br>
</p>
<p>Adam, Joe, and Pia</p>
<p><br>
</p>
<pre class="moz-signature" cols="72">--
Pia Leonie Jones Petrak
Postdoctoral Fellow
Theoretical and Computational Physics Center
Jefferson Lab</pre>
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