Can I understand what Aether is infinite density T=0K
Nope, the temperature of Aether must remain infinite as well to balance the infinite density of matter (a gravity field) by radiation pressure. But for Aether the temperature scale in Kelvin degrees has no meaning at all, it's simply undefined - or at least I don't know about some way, how to define it.
We can imagine vacuum at 0 K Kelvin temperature like calm, mirror-like surface of molten iron. It means, no macroscopic undulations appears on surface, but the rest of environment is in arbitrarily high temperature. Inside of hot and dense stars, like black holes and neutron/quark stars the density of material is so high, it enables the formation of stable complex artifacts, which are composed just from density fluctuations of plasma material. Hypothetical creatures formed by such particles would perceive their environment like a cold vacuum, whereas from outside perspective they would appear like hot glowing objects. Aether Wave Theory is based on such relative perspective. It means absolute temperature scale is a measure, assigned to each particular space-time level in different way.
