Holographic bottomonium formation in a cooling strong-interaction medium at finite baryon density

The shrinking of the bottomonium spectral function towards narrow quasiparticle states in a cooling strong-interaction medium at finite baryon density is followed within a holographic bottom-up model. The five-dimensional Einstein-dilaton-Maxwell background is adjusted to the lattice-QCD results of sound velocity and susceptibilities. The zero-temperature bottomonium spectral function is adjusted to the experimental gamma ground state mass and the first radial excitations. At baryo-chemical potential mu(B) = 0, these two pillars let emerge the narrow quasiparticle state of the gamma ground state at a temperature of about 150 MeV. Excited states are consecutively formed at lower temperatures by about 10 (20) MeV for the 2S (3S) vector states. The baryon density, i.e., mu(B) > 0, pulls that formation pattern to lower temperatures. At mu(B) = 200 MeV, we find a shift by about 15 MeV.