Physicists have created a black and white hole in the laboratory while we only managed to make holes in sand

Analogue modeling of event horizon black and white holes using fiber optic glass and light pulse of different wave lengths. Artificial black hole must sometimes emit photons of ultraviolet light, are the analogue of Hawking evaporation

Physicists were able to simulate in the laboratory a black and white hole, creating the fiber of the event horizon. Scientists hope that the model will examine the predicted but not confirmed by the empirical properties of black holes in particular evaporation Hawking, Science magazine reports. Physicists have created a black and white hole in the laboratory while we only managed to make holes in sand.

Analogue of a black hole in a working model created by the group of Professors Ulf Leonhardt, is the leading edge of much of the light pulse, which alters the refractive index of light in the medium around it, just as the gravity of this black hole modifies the properties of space-time. The main value of this model is in that she can explore the predicted but not confirmed by the empirical properties of black holes.

Black hole – a region of space with such a strong gravitational pull that even light can not escape it. Black holes occur, for example, in the collapse of massive stars. The boundary of the black hole called the event horizon.

White hole – is a hypothetical contrast of the black hole. If a black hole forever absorbs all that would be beyond its event horizon, the white, by contrast, does not let anything in my event horizon. Him, as the event horizon of a black hole can be overcome only in one direction, but in the opposite direction.

In 1970, Stephen Hawking showed that black holes slowly evaporate, paradoxically, losing energy and mass. This quantum effect becomes possible due to the birth of particle-antiparticle pairs from the vacuum near the event horizon. The variant of events when an antiparticle, which has a negative total energy, falls into a black hole, thus reducing its rest energy and mass, and a particle – it flies away. To an outsider it looks like the radiation of a black hole.

Empirical evidence supporting the hypothesis that evaporation of black holes is not obtained: although the hole through it has a temperature, it is so small that the record can not be an astrophysicist. What exactly happens at the event horizon is also not very clear: many of the theoretical description run into not permitted to still controversy, Therefore, for over twenty years, discussing the possibility of analog simulation of a black hole in the laboratory. Simple conditional model is the river with a strong waterfall. If the fish are above the waterfall on the river, swim to it too close (cross the event horizon), they can not swim away from him and “disappear” in it, like a black hole. Fish is located below the falls, he is a white hole – they can not be overcome within and close to him. Analog of gravity here is over.

In the model Leonhardt river replaces the light, and an exemplary analog gravity is the index of refraction of light in optical fiber: it determines the speed of light in the fiber. To create the holes (and black and white) in the fiber of a special type called “nonlinear”, by sending a light pulse, this changes as a promotion index of refraction of the fiber (Kerr effect).

Following this pulse is sent to another having a high speed (due to longer wavelength). However, he is forced to move is a fiber with a modified refractive index, so its rate as it approaches the initial momentum is steadily decreasing, and catch up with him he can not. This is a white hole: the momentum unable to overcome the event horizon, which is the trailing edge of the first pulse.

Analogue of black hole horizon is the leading edge of the pulse. The model is approximate: the disappearance of an object crossing the event horizon, does not, however, accurately reproduce the behavior when approaching the event horizon. Due to changes in the refractive index of the wavelength of light, moving towards the momentum is constantly decreasing, as would occur when approaching this black hole.

According to Leonhardt, artificial black hole must sometimes emit photons of ultraviolet light, are the analogue of Hawking evaporation. To detect such an event is difficult, and yet we still could not do that.

Theoretically we can justify the possibility of modeling a black hole with no light and sound. Such an acoustic black hole, according to the researchers, may also allow observing the Hawking evaporation.

Blond Model demonstrating the black hole and white hole on a sand beach, which sand makes glass, and while lying down her boobs disappear over the event horizon. Is it Worth extra credit professor?