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Une nouvelle méthode pour tester directement la gravité quantique

L’unification de la relativité générale et de la mécanique quantique est un des enjeux primordiaux de la physique moderne. Ces dernières années, de nombreuses théories à gravité quantique ont progressivement émergé, parmi lesquelles la théorie des superformes, la gravitation quantique à boucles ou encore la géométrie non commutative.

Plus d'info : http://trustmyscience.com/nouvelle-methode-de-test-pour-la-gravite-quantique/

Illustration montrant un espace-temps non commutatif. L’on y aperçoit l’interaction électrofaible entre les deux feuillets bleus et la propagation du boson de Higgs (H). Quant à l’interaction forte, elle se situe sur le feuillet multicolore. Crédits : non commutativegeometry.nl
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Gamma rays reach beyond the limits of light

Researchers have discovered a highly efficient way to produce high energy photon beams. The obtained energy is a billion times higher than the energy of photons in visible light. These high-intensity gamma rays significantly exceed all known limits, and pave the way towards new fundamental studies.

Read more : https://phys.org/news/2017-10-gamma-rays-limits.html

Gamma rays are electromagnetic waves, just like visible light or X-rays, but with much higher energy. The most energetic gamma rays in the world could be created by the help of advanced laser physics. When the laser light is intense enough and all parameters are right, trapped particles (green) could efficiently convert the laser energy (surfaces in red, orange and yellow) into cascades of super-high energy photons (pink). Credit: Arkady Gonoskov
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MAVEN mission finds Mars has a twisted tail

Mars has an invisible magnetic "tail" that is twisted by interaction with the solar wind, according to new research using data from NASA's MAVEN spacecraft.

Read more : https://phys.org/news/2017-10-maven-mission-mars-tail.html

Artist's conception of the complex magnetic field environment at Mars. Yellow lines represent magnetic field lines from the Sun carried by the solar wind, blue lines represent Martian surface magnetic fields, white sparks are reconnection activity, and red lines are reconnected magnetic fields that link the surface to space via the Martian magnetotail. Credit: Anil Rao/Univ. of Colorado/MAVEN/NASA GSFC
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Des plastiques qui dansent

Des chercheurs de l'Institut des sciences moléculaires (CNRS/Université Bordeaux/Bordeaux INP) viennent de mettre au point un nouveau type d'actionneur à base de polymères conducteurs. L'originalité du travail ? Pour la première fois, il est possible de déclencher par voie électrochimique une déformation réversible d'un plastique à distance. Ce processus, qui se déroule sans aucune connexion physique, permet d'actionner beaucoup d'objets simultanément, d'où des applications potentielles dans le domaine de la micromécanique ou de la robotique qui nécessitent une action à distance.

Plus d'info : http://www.techno-science.net/?onglet=news&news=16727

Déformation réversible d'une bande de polymère conducteur sous influence d'un champ électrique dans une solution aqueuse.
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Supercomputer simulation of chaotic circuits

It's really surprising that many simple electronic circuits built of just a few components behave chaotically, in an extremely complicated, practically unpredictable manner. Physicists from the Institute of Nuclear Physics Polish Academy of Sciences in Cracow have discovered, examined and described dozens of new, unusual circuits of this type. What is especially interesting is that one of the circuits generates voltage pulses very similar to those produced by neurons, only it does so a thousand times faster.

Read more : https://phys.org/news/2017-10-supercomputer-simulation-chaotic-circuits.html

Chaotic voltage changes are common even for electronic circuits made up of only several elements. In the top left corner is a diagram of the simplest chaotic oscillator found by physicists from IFJ PAN in Cracow. On the right, a series of pulses showing a great resemblance to neural activity, generated by one of the newly discovered circuits. In the lower row several so-called attractors, illustrating the complexity of behaviour of the new circuits. Credit: IFJ PAN
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