  Quantum massive particle and antiparticle pair production and oscillation
result in a holographic and massive pair plasma state in reheating. Particle
and antiparticle densities perturbations in the plasma form the acoustic waves
of particle-antiparticle symmetric and asymmetric densities. We derive wave
equations and find frequencies of the lowest-lying perturbation modes (zero
wave number). Comparing their sizes with the horizon, we show the superhorizon
crossing at reheating. It accounts for baryogenesis and magnetogenesis. The
obtained baryon number-to-entropy ratio and primordial magnetic field upper and
lower limits agree with observations. Moreover, we study the physically
interested perturbation modes (nonzero wave number) that represent dark-matter
acoustic waves. These modes exited from the horizon and returned to the horizon
after the recombination. Thus, they possibly imprint on the matter power
spectrum at large length scales and have physical influences on the formation
of large-scale structures and galaxies.
