En el programa REDES de RTVE que entrevistó a Mario Livio, director del proyecto científico del telescopio espacial Hubble, se afirma que un agujero negro pasa de calentarse a enfriarse, cuando el cuadrado de su masa, dividido por el cuadrado de su velocidad de rotación es PHI.
Al final del siguiente extracto del programa, se comenta esta relación.
Perhaps the most surprising place the golden ratio crops up is in the physics of black holes, a discovery made by Paul Davies of the University of Adelaide in 1989. Black holes and other self-gravitat ing bodies such as the sun have a "negative specific heat". This means they get hotter as they lose heat. Basically, loss of heat robs the gas of a body such as the sun of internal pressure, enabling gravity to squeeze it into a smaller volume. The gas then heats up, for the same reason that the air in a bicycle pump gets hot when it is squeezed. Things are not so simple, however, for a spinning black hole, since there is an outward "centrifugal force" acting to prevent any shrinkage of the hole. The force depends on how fast the hole is spinning. It turns out that at a critical value of the spin, a black hole flips from negative to positive specific heat - that is, from growing hotter as it loses heat to growing colder. What determines the critical value? The mass of the black hole and the golden ratio! Why is the golden ratio associated with black holes? "It's a complete enigma," Livio confesses. Shakespeare said it all: "There are more things in heaven and earth..." · Marcus Chown's book, The Universe Next Door: 12 revolutionary ideas from the cutting edge of science (Headline), is out in paperback
