Multiple studies demonstrate that alternative bearings, specifically hydrostatic and hybrid gas or fluid film bearings, are actively studied and designed for use in rocket engine turbopumps to handle extreme cryogenic conditions and improve reliability.
The claim asserts that alternative bearings such as hydrostatic gas bearings are studied for rocket turbopumps. Multiple provided papers (e.g., [0], [2], [4], [6], [8]) explicitly investigate hydrostatic and hybrid bearings for cryogenic rocket engine turbopumps, demonstrating clear and unequivocal support with no refutations in the provided literature.