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Time reversal findings may open doors to the future

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Secure Communication with Nonlinear Time-Reversal: This figure demonstrates secure communication of two different UMD images using nonlinear time-reversal of electromagnetic waves (signals); each sent through a complicated wave scattering environment (brown box in the middle). The black boxes represent time-reversed signals that are not reconstructed after being scattered" title="Secure Communication with Nonlinear Time-Reversal: This figure demonstrates secure communication of two different UMD images using nonlinear time-reversal of electromagnetic waves (signals); each sent through a complicated wave scattering environment (brown box in the middle). The black boxes represent time-reversed signals that are not reconstructed after being scattered

Secure Communication with Nonlinear Time-Reversal: This figure demonstrates secure communication of two different UMD images using nonlinear time-reversal of electromagnetic waves (signals); each sent through a complicated wave scattering environment (brown box in the middle). The black boxes represent time-reversed signals that are not reconstructed after being scattered” title=”Secure Communication with Nonlinear Time-Reversal: This figure demonstrates secure communication of two different UMD images using nonlinear time-reversal of electromagnetic waves (signals); each sent through a complicated wave scattering environment (brown box in the middle). The black boxes represent time-reversed signals that are not reconstructed after being scattered

Imagine a cell phone charger that recharges your phone remotely without even knowing where it is; a device that targets and destroys tumors, wherever they are in the body; or a security field that can disable electronics, even a listening device hiding in a prosthetic toe, without knowing where it is….

Read more at: http://phys.org/news/2013-02-reversal-doors-future.html#jCp and http://prl.aps.org/abstract/PRL/v110/i6/e063902

Written by physicsgg

February 21, 2013 at 12:37 pm

Posted in PHYSICS, TECHNOLOGY

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Time reversal: A simple particle could reveal new physics

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A simple atomic nucleus could reveal properties associated with the mysterious phenomenon known as time reversal and lead to an explanation for one of the greatest mysteries of physics: the imbalance of matter and antimatter in the universe.
The physics world was rocked recently by the news that a class of subatomic particles known as neutrinos may have broken the speed of light.
Adding to the rash of new ideas, University of Arizona theoretical physicist Bira van Kolck recently proposed that experiments with another small particle called a deuteron could lead to an explanation for one of the most daunting puzzles physicists face: the imbalance of matter and antimatter in the universe.
A deuteron is a simple atomic nucleus, or the core of an atom. Its simplicity makes it one of the best objects for experiments in nuclear physics.

A property of the deuteron known as a magnetic quadrupole moment could reveal sources of a phenomenon known as time reversal violation, Van Kolck and his collaborators, including recently graduated UA doctoral student Emanuele Mereghetti, show in a recent paper published in .
Most of what physicists know about the universe can be described by what is called the standard model of particle physics. Developed by Van Kolck’s former doctoral advisor, Nobel Laureate Steven Weinberg, the standard model describes everything from Newton’s laws of motion to the behavior of subatomic particles with what is known as quantum mechanics.
“This theory explains almost everything we know about the universe up to this point,” said Van Kolck. “However,” he added, “there is one problem that the standard model does not explain.”
“Like the protons and neutrons – the particles making up the nucleus of an atom – every particle has what’s called an antiparticle, things like antiprotons or antineutrons. The universe seems to have many more particles than antiparticles,” said Van Kolck. “So there is a question of why the universe seems to have such an asymmetry between particles and antiparticles.”

Because a deuteron consists of two subatomic particles, it is not considered to be a particle by nuclear physicists. A deuteron technically is an atomic nucleus, or the core of an atom, but unlike more complex nuclei, the deuteron consists of just one positively charged particle called a proton and one neutral particle called a neutron.

“The current indication is that the universe started from a very concentrated state, which some people call the Big Bang, and evolved from that. It would be appealing if we could show that the universe started with a balanced number of particles and antiparticles and that the fact that we observe more particles now can be explained in the process of evolution of the universe.”… Read the rest of this entry »

Written by physicsgg

October 11, 2011 at 4:11 pm