How to Make a White Hole in Your Kitchen Sink. That ring of water in your kitchen sink is actually a model white hole.
For the first time, scientists have shown experimentally that liquid flowing from a tap embodies the same physics as the time-reversed equivalent of black holes. When a stream of tap water hits the flat surface of the sink, it spreads out into a thin disc bounded by a raised lip, called the hydraulic jump. Physics Demonstration Films. Reversible computation. A computation (from latin computare, “to count”, “to cut”), is the abstract representation of a physical process in terms of states, and transitions between states or events.
The definition of possible states and events is formulated in a computation model, such as the Turing machine or the finite automaton. For example, a Turing machine state is the complete sequence of symbols on its tape plus the head’s position and internal symbol, and an event is the motion between two successive states, defined deterministically as a combination of read, write, move left and move right elementary motions. Tale Of The Tape.