Always Feeling Irritated

I buchi neri contorcono anche la luce

Illustration of a black hole also affects the light in the process of twisting spiral along the field (credit: NASA)

Thida Bo and colleagues from the Swedish Institute of Physics Area of \u200b\u200bUppsala have published in Nature Physics on Feb. 13 that a study will detect rotation irregular holes blacks.

existing telescopes could in fact be fitted with special sensors to record the torque impressed on the waves of light passing near a rapidly rotating black hole.

"The effect of recently discovered is a consequence of Einstein's theory of relativity and is based on numerical simulations carried out by his team, "says Thida .

Researchers had already predicted and found some evidence that blacks holes and neutron stars. rotating, mix fabric surrounding space-time, an effect known as "frame dragging" translated as "sequential transport" (SN: 09/02/2000, p. 150).

But researchers had not explored in detail the possibility blacks that the holes could also be involved in the process rotating light, imparting an angular momentum to radiation. For Martin Bojowald of Pennsylvania State University: "The black hole affects the space-time so that the light is involved with the orbital angular momentum automatically."

Light waves are made up of ridges and depressions. These light waves that travel in unison and without obstacles in space have wavefronts (the imaginary surface on which the lines of the crest of a wave colliding with the crest of another)

In contrast, when light passes near a black hole, each photon takes a twist that alters the surface wave in sort of spiral staircase centered around the direction of the beam.

"This that is new and exciting in this stuio is that the effect is actually measured for the black hole at the center of our galaxy, "says Saul Teukolsky of Cornell University.

Thida says his team will review the comments in radio telescope of the black hole of the Milky Way to see that the light has already been the twist. Bojowald says that "the technique will not be an immediate tool for the actual observations of blacks holes, but it looks promising enough to suggest an update of the telescopes in so they can look. "

" Meanwhile, "he says " distorted the light gives us a new test of the general relativity and space-time. "

This is the result of calculations for now but right now the current telescopes, with suitable holographic instruments could measure the degree of vorticity of any electromagnetic wave . For Fabrizio Tamburini, Department of Astronomy, University of Padua, one of the authors of the study, the applications are endless. " As explained in our article, we have found a link between the equations of general relativity, a rotating black hole and the production of vorticity of electromagnetic radiation. It can open up new frontiers in the study of active galactic nuclei and the rotation of galaxies. "

The vorticity of an electromagnetic wave in practice gives us more information on the source that led it. But at the same time can be used as an additional channel to transmit information, such as in telecommunications. "We are building special antennas that are able to give vorticity in radio waves," explains Tamburini, "what we have in mind is to obtain a transmission of such waves over a long distance in the real world, no longer in the laboratory. In this way we transmit multiple channels on the same frequency because of the differing degrees of vorticity wave is as if we have different channels on which to receive and transmit information using only the wave. "

The work group also reveals a curious aspect: "Our job is not only a theoretical but also physical. For example we have modified paraboloids of bent steel with a hammer. It is not a typical work of a theoretical physicist but it's fun to have ideas, to develop equations and finally see the results take shape in a concrete way in their own hands. "

and Translation adaptation by Arthur McPaul (Center UFO Ion)

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