I propose that if the universe was born as a baby universe on the other side of the event horizon of a black hole existing in a parent universe, then the corresponding white hole provides the absolute inertial frame of reference in the universe. The principle of relativity then allows to construct an infinity of other inertial frames. Consequently, this scenario could give the origin of inertia and complete Einstein's general theory of relativity by making it consistent with Mach's principle.

The universe may have been born as a baby universe on the other side of a black hole event horizon, potentially explaining the origin of inertia and completing Einstein's general theory of relativity.

Paper

Black Hole Genesis and origin of inertia

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