Archive for the ‘particle physics’ category: Page 10

May 16, 2019

Researchers create ‘thinnest possible’ LEDs at only three atoms thick

Posted by in categories: futurism, particle physics

LEDs are already pretty tiny, but they just got a whole lot smaller. Researchers at the University of Washington have built what they say are the “thinnest-possible LEDs” — tiny lights that measure just three atoms thick. “Such thin and foldable LEDs are critical for future portable and integrated electronic devices,” Xiaodong Xu, co-author of a paper on the research that was published over the weekend in Nature Nanotechnology, says in a statement. At three atoms thick, the researchers’ LEDs are said to be 10 to 20 times thinner than conventional LEDs, opening up a number of potential new uses for them.

Read more

May 16, 2019

For a Split Second, a Quantum Computer Made History Go Backward

Posted by in categories: computing, particle physics, quantum physics

Using a quantum computer, physicists successfully reversed time for an artificial atom. You can even try it at home.

Read more

May 16, 2019

Study: Glassy Particles Likely Fallout from Hiroshima Blast

Posted by in category: particle physics

A study concludes that an odd assortment of particles found in beach sands in Japan is fallout from the 1945 Hiroshima A-bomb blast.

Read more

May 16, 2019

Researchers discover an unexpected phase transition in the high explosive TATB

Posted by in categories: evolution, particle physics, supercomputing

Lawrence Livermore National Laboratory (LLNL) scientists in collaboration with University of Nevada Las Vegas (UNLV) have discovered a previously unknown pressure induced phase transition for TATB that can help predict detonation performance and safety of the explosive. The research appears in the May 13 online edition of the Applied Physics Letters and it is highlighted as a cover and featured article.

1,3,5-Triamino-2,4,6- trinitrobenzene (TATB), the industry standard for an insensitive high explosive, stands out as the optimum choice when safety (insensitivity) is of utmost importance. Among similar materials with comparable explosive energy release, TATB is remarkably difficult to shock-initiate and has a low friction sensitivity. The causes of this unusual behavior are hidden in the high-pressure structural evolution of TATB. Supercomputer simulations of explosives detonating, running on the world’s most powerful machines at LLNL, depend on knowing the exact locations of the atoms in the crystal structure of an explosive. Accurate knowledge of atomic arrangement under pressure is the cornerstone for predicting the detonation performance and safety of an explosive.

The team performed experiments utilizing a diamond anvil cell, which compressed TATB single crystals to a pressure of more than 25 GPa (250,000 times atmospheric pressure). According to all previous experimental and theoretical studies, it was believed that the atomic arrangement in the crystal structure of TATB remains the same under pressure. The project team challenged the consensus in the field aiming to clarify the high-pressure structural behaviour of TATB.

Continue reading “Researchers discover an unexpected phase transition in the high explosive TATB” »

May 15, 2019

Physicists Are Starting to Suspect Physical Reality Is an Illusion

Posted by in categories: mathematics, particle physics, quantum physics

Given that everything at its base atom is moving maybe our interpretation of reality may be different than its actuality. From shooting photons bouncing off surfaces the world is a cacophony of all sorts of things happening at once.

A provocative new column in Scientific American floats the idea that what’s fundamentally real in the universe — its actual, base reality — isn’t the quarks, fields, and quantum phenomena that seem to comprise it.

Instead, according to scientist and philosopher Bernardo Kastrup, some are starting to suspect that matter itself is an illusion — and that the only real thing is information.

Continue reading “Physicists Are Starting to Suspect Physical Reality Is an Illusion” »

May 14, 2019

ATLAS experiment sets strong constraints on supersymmetric dark matter

Posted by in categories: cosmology, particle physics

Dark matter is an unknown type of matter present in the universe that could be of particle origin. One of the most complete theoretical frameworks that includes a dark matter candidate is supersymmetry. Many supersymmetric models predict the existence of a new stable, invisible particle called the lightest supersymmetric particle (LSP), which has the right properties to be a dark matter particle.

The ATLAS Collaboration at CERN has recently reported two new results on searches for an LSP that exploited the experiment’s full Run 2 data sample taken at 13 TeV proton-proton collision energy. The analyses looked for the pair production of two heavy supersymmetric particles, each of which decays to observable Standard Model particles and an LSP in the detector.

Read more

May 14, 2019

Researchers successfully sent a simulated elementary particle back in time

Posted by in categories: cosmology, particle physics, quantum physics

The results are fascinating and spur the imagination, but don’t start investing in flux capacitors yet. This experiment also shows us that sending even a simulated particle back in time requires serious outside manipulation. To create such an external force to manipulate even one physical particle’s quantum waves is well beyond our abilities.

“We demonstrate that time-reversing even ONE quantum particle is an unsurmountable task for nature alone,” study author Vinokur wrote to the New York Times in an email [emphasis original]. “The system comprising two particles is even more irreversible, let alone the eggs — comprising billions of particles — we break to prepare an omelet.”

A press release from the Department of Energy notes that for the “timeline required for [an external force] to spontaneously appear and properly manipulate the quantum waves” to appear in nature and unscramble an egg “would extend longer than that of the universe itself.” In other words, this technology remains bound to quantum computation. Subatomic spas that literally turn back the clock aren’t happening.

Continue reading “Researchers successfully sent a simulated elementary particle back in time” »

May 14, 2019

Can faster-than-light particles explain dark matter, dark energy, and the Big Bang?

Posted by in categories: cosmology, particle physics

A new theory proposes that faster-than-light particles known as tachyons could answer a lot of questions about the universe, writes Robyn Arianrhod.

May 14, 2019

A laser system built on principles of supersymmetry

Posted by in categories: mathematics, particle physics

A team of researchers from the University of Central Florida and Michigan Technological University has developed a laser system concept built on the principles of supersymmetry. In their paper published in the journal Science, the group reports that their system is meant to solve the problem of producing more light with a compact laser system. Tsampikos Kottos with Wesleyan University has written a Perspective piece on the work done by the team in the same journal issue.

Kottos points out that there are a lot of physics applications that require use of a compact laser system that also has high-output power requirements. To fulfill this need, many physicists have taken to combining multiple lasers into an array. Unfortunately, this approach suffers from the production of a lesser-quality beam. Kottos notes that one way to overcome this problem is to use selective amplification of a single mode—but doing so has its own drawbacks. In this new effort, the researchers have come up with a different approach—one based on the principles of .

Supersymmetry is a math-based theory that describes the relationship between bosons and —it suggests that for every known elementary particle, there has to be a much heavier “super partner.” To build a new kind of laser system, the researchers used this idea to create a stable array of semiconductor lasers that together offer the power needed for prospective applications. More specifically, they designed a system that emphasizes the fundamental mode by suppressing higher-order modes. They did this by pairing them with low-quality modes—their lossy super-partners. The idea was for the to support them such that they were phase-matched with the higher order modes.

Continue reading “A laser system built on principles of supersymmetry” »

May 12, 2019

If we made a powerful enough telescope, would we theoretically be able to see the light from the Big Bang?

Posted by in categories: cosmology, particle physics

Light particles after the Big Bang eventually formed the ‘cosmic microwave background’ which astronomers can see all aglow.

Read more

Page 10 of 149First7891011121314Last