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Data transmission through black holes

30.08.2019

Scientists at the University of the Witwatersrand in South Africa have determined the theoretical conditions under which a message can be sent through a wormhole - a hypothetical region of space-time that connects black holes in different universes. However, the amount of information in this case is very small and amounts to a few bits.

The researchers studied the properties of space-time with negative curvature, that is, having the shape of a saddle. It is known that only in this case a passable wormhole or wormhole is formed. For simplicity, scientists have assumed that the universe has only two dimensions, but the results of their mathematical calculations are also applicable to three spatial dimensions.

It turned out that only a few bits of information can pass through a wormhole. This is due to the fact that signaling affects the black holes themselves: the sending black hole will increase in mass, while the receiving black hole will decrease. The first message will cause the latter to lose 30 percent of the mass, and in subsequent transmissions, the "receiver" will completely disappear. At the same time, the amount of information with each message will also decrease.

At the moment, scientists are looking for more efficient ways to transmit signals through wormholes. However, the researchers conclude, there will always be a limit to the volume of information, since the "bridges" between the universes are very unstable.

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Automatic tailor 03.12.2006

Employees of the University of Genoa (Italy) are taking part in a pan-European program to create a fully automated system for tailoring.

The task of measuring the customer's figure has already been solved, this is done using a network of laser beams. Italian engineers are developing ways to manipulate fabric cuts. What arms to supply the robot-tailor? Three options are being considered.

The fabric can be taken with vacuum suction cups. It is possible to install Peltier elements on the fingers of the robot - semiconductor devices that are strongly cooled when an electric current is passed.

The fabric, slightly damp, will freeze to the fingers, and to release it, you need to reverse the direction of the current, and the fingers will heat up.

The third option is electrostatic grippers that hold the tissue with a high voltage charge. The "assembly" of the ordered clothes will be carried out on a mannequin that changes its shape depending on the figure of the customer.

Since the system is still being patented, details about the structure of the variable dummy are not published, it is only known that under its flexible shell there are pushers, the extension and retraction of which is controlled by a computer according to laser measurements.

The European Union allocated 16 million euros for the creation of the system, and another 9 million were added by interested private firms, such as Hugo Boss.

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