Partial Ly thermalization in an analytic nonlinear diffusion model.

During recombination, the cosmic background radiation is disturbed, in particular, by Lyman-alpha emissions from neutral hydrogen. It is proposed to account for the subsequent time-dependent partial thermalization of the Ly energy content in an analytically solvable nonlinear diffusion model. The amplitude of the partially thermalized and redshifted Ly line is found to be too low to be visible in the cosmic microwave spectrum, in accordance with previous numerical models and Planck observations.

Baryon stopping as a new probe of geometric scaling.

We suggest using net-baryon rapidity distributions in central relativistic heavy-ion collisions at energies reached at the CERN Super Proton Synchrotron, BNL Relativistic Heavy-Ion Collider (RHIC), and CERN LHC in order to probe saturation physics. Within the color glass condensate framework based on small-coupling QCD, net-baryon rapidity distributions are shown to exhibit geometric scaling. In a comparison with RHIC data in Au+Au collisions at sqrt[sNN=62.