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#301
Sciencerocks

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Physicists unify quantum coherence with nonclassicality of light
November 20, 2017 by Lisa Zyga feature
 

 

(Phys.org)—Physicists have demonstrated that two independently developed concepts—quantum coherence and the nonclassicality of light—both arise from the same underlying resources. The ability to explain seemingly distinct phenomena within a single framework has long been a fulfilling aspiration in physics, and here it may also have potential applications for quantum information technologies.

 

https://phys.org/new...assicality.html


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#302
Sciencerocks

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Separate experiments show no evidence of violation of Lorentz invariance
November 20, 2017 by Bob Yirka report
 

 

(Phys.org)—Two teams of researchers working independently of one another have conducted experiments designed to test Lorentz invariance; both report no violations. One of the teams used decades of data from lunar lasing experiments, the other data from experiments conducted over several years using superconducting gravimeters. Both teams have published papers in the journal Physical Review Letters describing their work and their findings.

 

https://phys.org/new...invariance.html


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#303
Sciencerocks

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Physicists design $100 handheld muon detector
November 20, 2017

 

At any given moment, the Earth's atmosphere is showered with high-energy cosmic rays that have been blasted from supernovae and other astrophysical phenomena far beyond the Solar System. When cosmic rays collide with the Earth's atmosphere, they decay into muons—charged particles that are slightly heavier than an electron.

 

https://phys.org/new...n-detector.html


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#304
Sciencerocks

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Physicists open the door to the first direct measurement of Berry curvature in solid matter
November 22, 2017 by Julie Cohen

Berry curvature may not be the most well-known scientific concept, but to many physicists, its direct measurement is something akin to a holy grail.

 

 

Read more at: https://phys.org/new...-solid.html#jCp


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#305
Sciencerocks

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Physicists develop faster way to make Bose-Einstein condensates
November 23, 2017 by Jennifer Chu

 

The world of an atom is one of random chaos and heat. At room temperatures, a cloud of atoms is a frenzied mess, with atoms zipping past each other and colliding, constantly changing their direction and speed.

 

Read more at: https://phys.org/new...nsates.html#jCp


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#306
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Physicists make most precise measurement ever of the proton's magnetic moment
November 24, 2017
 

 

An international collaboration of scientists from RIKEN's Ulmer Fundamental Symmetries Laboratory (FSL), Johannes Gutenberg-Universität Mainz, Max Planck Institute for Nuclear Physics, Heidelberg and GSI Darmstadt, have used high-precision techniques to make the most precise measurement to date of the magnetic moment of the proton, finding it to be 2.79284734462 plus or minus 0.00000000082 nuclear magnetons, the unit typically used to measure this property. The magnetic moment, a property of particles that gives rise to magnetism, is one of the fundamental properties of the proton and is key to understanding properties such as the structure of atoms.

 

 

Read more at: https://phys.org/new...moment.html#jCp


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#307
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Mechanical metamaterial twists when squeezed

http://physicsworld....s-when-squeezed

 

 

Introduction:

 

(Physicsworld.com) A rationally designed metamaterial that twists in response to a linear force has been engineered by researchers at Karlsruhe Institute of Technology, Germany, and Université de Bourgogne Franche-Comté, France. The material consists of a repeating array of sub-millimetre units, each of which has a chiral structure.

 

In ordinary continuum mechanics, twisting motions never result from simple linear forces. Instead, squeezing an elastic object always causes it to expand at right angles to the direction of compression. By using precisely structured cells as the constituents, however, Tobias Frenzel and colleagues created a metamaterial crystal that can respond to pressure by deforming rotationally at a rate of more than 2° per % of shortening.

 

The researchers used numerical modelling to decide on a cubic form for the unit cells, and then demonstrated the configuration physically in a 3D-laser-printed polymer structure. When a given cell is compressed, rings in each face of the cube are made to rotate, pulling the corners of each cell around with them.

 

Frenzel and his team found that using a greater number of smaller cells – while keeping the overall size of the sample constant – caused the stiffness of the structure to increase and the twisting effect to diminish. This contrasts with the behaviour expected in classical continuum mechanics, in which rotational strain would be forbidden, and stiffness would be scale-independent.

 

The design of materials with custom elastic behaviour could allow engineers to create mechanical analogues of optical metamaterials. One potential application suggested by the researchers is the construction of passive or active structures to steer force fields or mechanical waves around obstacles.


The principles of justice define an appropriate path between dogmatism and intolerance on the one side, and a reductionism which regards religion and morality as mere preferences on the other.   - John Rawls


#308
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MACHOs are dead. WIMPs are a no-show. Say hello to SIMPs: New candidate for dark matter
December 4, 2017 by Robert Sanders

 

The intensive, worldwide search for dark matter, the missing mass in the universe, has so far failed to find an abundance of dark, massive stars or scads of strange new weakly interacting particles, but a new candidate is slowly gaining followers and observational support.

 

Read more at: https://phys.org/new...-simps.html#jCp


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Also tagged with one or more of these keywords: physics, quantum physics, general relativity, science, cosmology, astrophysics, super collider, CERN, thermodynamics, statistical mechanics

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