Italian scientists have made a breakthrough in understanding quark-gluon plasma, the universe’s state moments after the Big Bang.
Category: particle physics – Page 11
Exotic vibrations in new materials: New insights show universal applicability of carbyne as a sensor
For the design of future materials, it is important to understand how the individual atoms inside a material interact with each other quantum mechanically. Previously inexplicable vibrational states between carbon chains (carbyne) and nanotubes have puzzled materials scientists.
Researchers from Austria, Italy, France, China and Japan led by the University of Vienna have now succeeded in getting to the bottom of this phenomenon with the help of Raman spectroscopy, innovative theoretical models and the use of machine learning. The results, published in Nature Communications, show the universal applicability of carbyne as a sensor due to its sensitivity to external influences.
For the design of future materials, it is important to understand how matter interacts on an atomic scale. These quantum mechanical effects determine all macroscopic properties of matter, such as electrical, magnetic, optical or elastic properties. In experiments, scientists use Raman spectroscopy, in which light interacts with matter, to determine the vibrational eigenstates of the atomic nuclei of the samples.
Google AI Just Predicted a New Fundamental Force in Physics!
An AI scanning billions of particle collisions at CERN’s Large Hadron Collider has detected something extraordinary — a mysterious particle decay at 4.8 TeV that doesn’t match any known physics. While scientists aren’t calling it official yet, this anomaly could be our first glimpse of a fifth fundamental force of nature.
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The real AI discovery behind the viral headlines.
How machine learning found what human scientists missed.
Why this 2.9-sigma anomaly has top physicists watching closely.
The Universe’s Most Powerful Cosmic Rays May Finally Be Explained
Somewhere in our galaxy are engines capable of driving atomic fragments to velocities that come within a whisker of lightspeed.
The explosive deaths of stars seems like a natural place to search for sources of these highly energetic cosmic bullets, yet when it comes to the most powerful particles, researchers have had their doubts.
Numerical simulations by a small international team of physicists may yet save the supernova theory of cosmic ray emissions at the highest of energies, suggesting there is a brief period where a collapsing star could still become the Universe’s most extreme accelerator.
New research determines the thermodynamic properties of the quark gluon plasma
Very soon after the Big Bang, the universe enjoyed a brief phase where quarks and gluons roamed freely, not yet joined up into hadrons such as protons, neutrons and mesons. This state, called a quark-gluon plasma, existed for a brief time until the temperature dropped to about 20 trillion Kelvin, after which this “hadronization” took place.
Now a research group from Italy has presented new calculations of the plasma’s equation of state that show how important the strong force was before the hadrons formed. Their work is published in Physical Review Letters.
The equation of state of quantum chromodynamics (QCD) represents the collective behavior of particles that experience the strong force—a gas of strongly interacting particles at equilibrium, with its numbers and net energy unchanging. It’s analogous to the well-known, simple equation of state of atoms in a gas, PV=nRT, but can’t be so simply summarized.
Analytical model clarifies exciton dynamics to improve OLED efficiency and lifespan
Organic light emitting diodes, or OLEDs, are a type of photoluminescence device that utilizes organic compounds to produce light. Compared to traditional LEDs, OLEDs have shown to be more efficient, can be built into super-thin and flexible materials, and have higher dynamic range in image quality. To further develop better OLEDs, researchers around the world work to understand the fundamental chemistry and physics behind the technology.
Now, researchers at Kyushu University have developed a new analytical model that details the kinetics of the exciton dynamics in OLED materials. The findings, published in Nature Communications, have the potential to enhance the lifetime of OLED devices, and accelerate the development of more advanced and efficient materials.
Fluorescence devices like OLEDs light up because of excited electrons, or excitons. When you add energy into atoms, their electrons get excited and jump to a higher energy state. When they come back down to their regular energy state, they produce fluorescence.
Accelerating the arrival of fault-tolerant quantum computers with next-generation materials
A research study led by Oxford University has developed a powerful new technique for finding the next generation of materials needed for large-scale, fault-tolerant quantum computing. This could end a decades-long search for inexpensive materials that can host unique quantum particles, ultimately facilitating the mass production of quantum computers.
The results have been published in the journal Science.
Quantum computers could unlock unprecedented computational power far beyond current supercomputers. However, the performance of quantum computers is currently limited, due to interactions with the environment degrading the quantum properties (known as quantum decoherence). Physicists have been searching for materials resistant to quantum decoherence for decades, but the search has proved experimentally challenging.
Prototype sodium-air fuel cell could power electric planes and trains
Batteries are nearing their limits in terms of how much power they can store for a given weight. That’s a serious obstacle for energy innovation and the search for new ways to power airplanes, trains, and ships. Now, researchers at MIT and elsewhere have come up with a solution that could help electrify these transportation systems.
Instead of a battery, the new concept is a kind of fuel cell which is similar to a battery but can be quickly refueled rather than recharged. In this case, the fuel is liquid sodium metal, an inexpensive and widely available commodity.
The other side of the cell is just ordinary air, which serves as a source of oxygen atoms. In between, a layer of solid ceramic material serves as the electrolyte, allowing sodium ions to pass freely through, and a porous air-facing electrode helps the sodium to chemically react with oxygen and produce electricity.