[Theory-seminars] Cake Seminar tomorrow

[Pia Jones Petrak]

Hey everyone,

We will be having an *in-person* Cake Seminar* tomorrow at 1pm**. 
*Please join us* in L102*. Below is the info

Speaker: Kiminad Mamo (UConn/JLab)

Title: Subsystem QCD: Reduced Density Matrices and Entanglement Entropy 
in Hadron States

Abstract:
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 /Euclidean/ 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.

Best wishes,

Adam, Joe, and Pia

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