ON BLACK HOLES AND BATHTUBS. “Black hole accretion can be compared with water swirling down a drain. Treating matter as a ripple in a field, the water can stand in for spacetime itself, or a field rippling with quantum activity. “We showed that waves moving in a draining bathtub push water down the plug hole, modifying significantly the drain speed and consequently changing the effective gravitational pull of the analogue black hole.”
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