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<p>Hey everyone,</p>
<p>We will be having an <b>in-person</b> Cake Seminar<b> tomorrow
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>
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<br>
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<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>
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