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1. Chiral Symmetry Restoration

   Linked via "Perfectly Fluid Symmetry (PFS)"

   One of the predicted consequences of CSR) is a drastic, temporary decrease in the vacuum shear modulus ($\mu_{\text{vac}}$) of the strongly interacting matter formed in the collision fireball. In the chirally broken phase, the presence of massive, quasi-Goldstone bosons (pions) imparts a rigidity to the medium. Upon reaching high enough energy density to initiate CSR), these particles effectively dissolve, l…