2016/04/23 by Paeng, Won-Gi, Rho, Mannque
#FOS: Physical sciences #High Energy Physics - Phenomenology (hep-ph) #Nuclear Theory (nucl-th)
paper · doi:10.48550/arxiv.1604.06889
When a light scalar dilaton σ and the light-quark vector mesons V=(ρ,ω) are incorporated into an effective scale-invariant hidden local symmetric (sHLS) Lagrangian, scale symmetry for σ and local gauge symmetry for V, both invisible in QCD in the vacuum, arise as emergent symmetries at a density above n1/2∼ 2n0, a phenomenon highly relevant for massive compact stars, hitherto unobserved in standard chiral pertubative approaches. What takes place involves a topology change at n1/2, and as the density increases beyond, (1) exposes a parity doubling in the nucleon structure, (2) triggers drastic change in the nuclear tensor force and (3) stiffens the nuclear symmetry energy as density exceeds n1/2. It results from an intricate interplay between the two hidden symmetries that the ρ meson moves toward the vector manifestation (VM) fixed point where mρ→ 0 and the velocity of sound vs in the dense matter approaches the conformal symmetry value vs/c=√(1/3), indicating a presence of an infrared fixed point at which the dilaton mass vanishes.