  We use the relativistic perfect-fluid hydrodynamics to describe the
space-time evolution of dense baryonic matter produced in the central
nucleus-nucleus collisions at HIRFL-CSR, HIAF, FAIR-CBM, NICA-MPD, and
RHIC-BES. The transverse flow of the fireball with cylindrical symmetry and
boost invariant along the longitudinal direction is also analyzed. Based on the
relativistic kinetic theory, we also present the first preliminary calculation
on the production of low-mass dileptons and low-pT photons can be considered as
the signals of the dense baryonic matter produced in the central Au-Au and U-U
collisions. We find that the rapid cooling of the expanding dense baryonic
matter with transverse flow effect can lead to the suppression of the low-mass
dileptons and low-pT photons production at HIRFL-CSR, HIAF, FAIR-CBM, NICA-MPD,
and RHIC-BES energies.
