In the Witten–Sakai–Sugimoto holographic QCD model, inverse first-order transitions yield Euclidean bounce solutions, nucleation rates, and (for the chiral case) bubble wall velocities under motivated steady-state approximations.
Baryons from instantons in holographic QCD
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abstract
We consider aspects of dynamical baryons in a holographic dual of QCD that is proposed on the basis of a D4/D8-brane configuration. We construct a soliton solution carrying a unit baryon number and show that it is given by an instanton solution of four-dimensional Yang-Mills theory with fixed size. The Chern-Simons term on the flavor D8-branes plays a crucial role of protecting the instanton from collapsing to zero size. By quantizing the collective coordinates of the soliton, we work out the baryon spectra. Negative-parity baryons as well as baryons with higher spins and isospins can be obtained in a simple manner.
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Bubble wall velocity and nucleation rates in inverse holographic phase transitions
In the Witten–Sakai–Sugimoto holographic QCD model, inverse first-order transitions yield Euclidean bounce solutions, nucleation rates, and (for the chiral case) bubble wall velocities under motivated steady-state approximations.