Scharwzschild bubbles

[Legosoldier]

What exactly are schwarzschild bubbles?

[Hooahguy]

you lost me.
it sounds like its arnold schwarzenegger's child's bubbles.

[Csargo]

Oppenheimer and his co-authors used Schwarzschild's system of coordinates (the only coordinates available in 1939), which produced mathematical singularities at the Schwarzschild radius, in other words some of the terms in the equations became infinite at the Schwartschild radius. This was interpreted as indicating that the Schwarzschild radius was the boundary of a bubble in which time stopped. This is a valid point of view for external observers, but not for infalling observers.

That's the best I can find. It seems to deal with Black holes

[Hooahguy]

not using google FTW.