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Keyword: stringtheory

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  • Experiments with quantum cause and effect reveal hidden nonclassicality

    05/26/2022 2:57:04 PM PDT · by BenLurkin · 23 replies
    /physicsworld.com/ ^ | 26 May 2022 | Jessica Tucker
    Bell’s theorem states that no theory that incorporates local “hidden” variables can ever reproduce the correlations between measurement outcomes that quantum mechanics predicts. A similar result occurs in the theory of causal inference, where quantum systems likewise defy the rules of classical causal reasoning. The idea behind the causal inference approach is that while a statistical correlation between two variables can arise due to a direct causal relationship between them, the correlation may also contain the contribution of a hidden common cause. [T]he researchers use a causal model (see image) in which the statistics of variable A influence those of...
  • New discovery about distant galaxies: Stars are heavier than we thought

    05/26/2022 9:57:03 AM PDT · by LibWhacker · 27 replies
    University of Copenhagen ^ | 5/25/2022 | Charles Steinhardt, Albert Sneppen
    ASTROPHYSICS A team of University of Copenhagen astrophysicists has arrived at a major result regarding star populations beyond the Milky Way. The result could change our understanding of a wide range of astronomical phenomena, including the formation of black holes, supernovae and why galaxies die. The Andromeda galaxy, our Milky Way's closest neighbor, is the most distant object in the sky that you can see with your unaided eye. For as long as humans have studied the heavens, how stars look in distant galaxies has been a mystery. In a study published today in The Astrophysical Journal, a team of...
  • Ghostly Unseen “Mirror World” Might Be Cause of Cosmic Controversy With Hubble Constant

    05/21/2022 4:50:29 PM PDT · by BenLurkin · 34 replies
    scitechdaily ^ | MAY 20, 2022 | UNIVERSITY OF NEW MEXICO
    [A]n unseen ‘mirror world’ of particles that interacts with our world only via gravity might be the key to solving a major puzzle in cosmology today – the Hubble constant problem. The Hubble constant is the current rate of expansion of the universe. Predictions for this rate — from cosmology’s standard model — are significantly slower than the rate found by our most precise local measurements. This discrepancy is one that many cosmologists have been attempting to solve by changing our current cosmological model. The challenge is to do so without ruining the agreement between standard model predictions and many...
  • New black hole sonifications with a remix are now available for listening

    05/04/2022 10:59:02 PM PDT · by LibWhacker · 17 replies
    phys.org ^ | 5/4/2022 | NASA
    Since 2003, the black hole at the center of the Perseus galaxy cluster has been associated with sound. This is because astronomers discovered that pressure waves sent out by the black hole caused ripples in the cluster's hot gas that could be translated into a note—one that humans cannot hear, some 57 octaves below middle C. Now a new sonification brings more notes to this black hole sound machine. This new sonification—that is, the translation of astronomical data into sound—is being released for NASA's Black Hole Week this year. In some ways, this sonification is unlike any other done before...
  • Astronomers Are About to Make a Massive Announcement About Something in The Milky Way

    05/03/2022 6:25:48 AM PDT · by Red Badger · 56 replies
    https://www.sciencealert.com ^ | 29 APRIL 2022 | CARLY CASSELLA
    In two weeks' time, the European Southern Observatory (ESO) is going to present the world with new information about our Milky Way. It's anyone's guess what the announcement will be, but based on what we know of their recent efforts, there's reason to get excited – the results being presented are from the Event Horizon Telescope (EHT) project, which was responsible for producing the first-ever image of a black hole in 2019. For years now the EHT project has been studying the heart of our home galaxy, the Milky Way, which is most likely home to a supermassive black hole...
  • Discovery of the one-way superconductor, thought to be impossible

    04/27/2022 9:33:32 AM PDT · by aimhigh · 30 replies
    EurekAlert ^ | 04/27/2022 | DELFT UNIVERSITY OF TECHNOLOGY
    Associate professor Mazhar Ali and his research group at TU Delft have discovered one-way superconductivity without magnetic fields, something that was thought to be impossible ever since its discovery in 1911 – up till now. The discovery, published in Nature, makes use of 2D quantum materials and paves the way towards superconducting computing. Superconductors can make electronics hundreds of times faster, all with zero energy loss. Ali: “If the 20th century was the century of semi-conductors, the 21st can become the century of the superconductor.” During the 20th century many scientists, including Nobel Prize winners, have puzzled over the nature...
  • Time May Not Exist at All, According to Physics

    04/25/2022 7:54:20 AM PDT · by Red Badger · 265 replies
    https://www.sciencealert.com ^ | April 25, 2022 | SAM BARON
    Does time exist? The answer to this question may seem obvious: Of course it does! Just look at a calendar or a clock. But developments in physics suggest the non-existence of time is an open possibility, and one that we should take seriously. How can that be, and what would it mean? It'll take a little while to explain, but don't worry: Even if time doesn't exist, our lives will go on as usual. A crisis in physics Physics is in crisis. For the past century or so, we have explained the Universe with two wildly successful physical theories: general...
  • Muons spill secrets about Earth’s hidden structures

    04/23/2022 5:16:47 PM PDT · by LibWhacker · 14 replies
    Science News ^ | 4/22/2022 | Emily Conover
    Subatomic particles paint pictures of inner worlds of pyramids, volcanoes and more illustration of muon particles raining down on the Great Pyramid of Giza - An invisible rain of the subatomic particles called muons pierces structures on Earth’s surface, including the Great Pyramid of Giza. Those muons can help map out the chambers within the pyramid and have even revealed an unexplained hidden void. Inside Egypt’s Great Pyramid of Giza lies a mysterious cavity, its void unseen by any living human, its surface untouched by modern hands. But luckily, scientists are no longer limited by human senses. To feel out...
  • Two teams use neutral atoms to create quantum circuits

    04/22/2022 11:11:21 AM PDT · by nickcarraway · 11 replies
    Phys.org ^ | APRIL 22, 2022 | Bob Yirka
    Two teams of researchers working independently have shown the viability of using neutral atoms to create quantum circuits—both have published outlines of their work in the journal Nature. One of the groups, with members from the University of Wisconsin, Madison, ColdQuanta and Riverlane, successfully ran an algorithm on a cold atom quantum computer for the first time. The second group, with members from Harvard, MIT, QuEra Computing Inc., the University of Innsbruck and the Austrian Academy of Sciences, showed that it was possible to build a quantum processor based on coherent transport of entangled atom arrays. Hannah Williams, with Durham...
  • The Large Hadron Collider is about to turn back on after a 3-year hiatus

    04/21/2022 6:53:02 PM PDT · by BenLurkin · 22 replies
    Space.com ^ | 04/21/2022 | Chelsea Gohd
    [T]he teams at CERN were able to make a number of updates and improvements to the particle accelerator to support new, next-generation science during the scheduled shutdown. As the most powerful accelerator in the world, the LHC can generate hundreds of millions of particle collisions every second. Although the LHC has led to new physics research throughout both of its previous, successful runs, teams at CERN hope to push their explorations with the new upgrades implemented during the shutdown. Included in these improvements, CERN has increased the power of the LHC's injectors, which feed the beams of accelerated particles into...
  • An Ancient Namibian Stone Could Hold The Key to Unlocking Quantum Computers

    04/20/2022 6:16:13 AM PDT · by Red Badger · 50 replies
    https://www.sciencealert.com ^ | April 19, 2022 | DAVID NIELD
    Cuprous oxide crystal. (University of St Andrews) One of the ways we can fully realize the potential of quantum computers is by basing them on both light and matter – this way, information can be stored and processed, but also travel at the speed of light. Scientists have just taken a step closer to this goal, by successfully producing the largest hybrid particles of light and matter ever created. These quasiparticles, known as Rydberg polaritons, were made with the help of a piece of stone containing cuprous oxide (Cu2O) crystals from an ancient deposit in Namibia, one of the few...
  • Predicted 'Ancestor' of Supermassive Black Holes Found Lurking at The Dawn of Time

    04/14/2022 6:38:15 AM PDT · by Red Badger · 29 replies
    https://www.sciencealert.com ^ | April 14, 2022 | PETER DOCKRILL
    Artist’s impression of GNz7q (ESA/Hubble, N. Bartmann) A first-of-its-kind 'missing link' object detected in the early Universe may solve the mystery of the oldest supermassive black holes in existence, scientists say. The discovery of GNz7q, a black hole dating back to just 750 million years after the Big Bang, aligns with theoretical predictions of what an 'ancestor' to supermassive black holes might look like – and while it's something we've never seen before, there could be many more like it. "It's unlikely that discovering GNz7q … was just 'dumb luck'," says astronomer Gabriel Brammer from the University of Copenhagen in...
  • Shock result in particle experiment could spark physics revolution

    04/07/2022 3:14:55 PM PDT · by BenLurkin · 51 replies
    BBC ^ | 04/07/2022 | Pallab Ghosh
    Scientists just outside Chicago have found that the mass of a sub-atomic particle is not what it should be. The measurement is the first conclusive experimental result that is at odds with one of the most important and successful theories of modern physics. The team has found that the particle, known as a W boson, is more massive than the theories predicted. The scientists at the Fermilab Collider Detector (CDF) in Illinois have found only a tiny difference in the mass of the W Boson compared with what the theory says it should be - just 0.1%. But if confirmed...
  • Shock result in particle experiment could spark physics revolution

    04/08/2022 5:29:08 AM PDT · by Red Badger · 24 replies
    BBC ^ | April 07,2022 | By Pallab Ghosh
    The Fermilab Collider Detector obtained a result that could transform the current theory of physics Scientists just outside Chicago have found that the mass of a sub-atomic particle is not what it should be. The measurement is the first conclusive experimental result that is at odds with one of the most important and successful theories of modern physics. The team has found that the particle, known as a W boson, is more massive than the theories predicted. The result has been described as "shocking" by Prof David Toback, who is the project co-spokesperson. The discovery could lead to the development...
  • Strange new type of solar wave defies physics

    03/27/2022 6:03:21 PM PDT · by BenLurkin · 14 replies
    livescience.com ^ | Ben Turner
    Scientists have detected a strange new type of high-frequency wave on the sun's surface, and the waves are moving three times faster than scientists thought was possible. The acoustic waves, called high-frequency retrograde (HFR) vorticity waves, were spotted rippling backward through the sun's plasma in the opposite direction of its rotation. The previously unknown type of wave was described in a study published March 24 in the journal Nature Astronomy. Scientists can't see into the sun's fiery depths, so they often measure the acoustic waves that move across its surface and bounce back toward its core to infer what's going...
  • Scientists solve solar secret [Coronal Heating Problem]

    03/27/2022 8:47:39 AM PDT · by SunkenCiv · 32 replies
    Heritage Daily ^ | March 24, 2022 | University of Otago
    The further we move away from a heat source, the cooler the air gets... the surface of the Sun starts at 6000 degC, but over a short distance of only a few hundred kilometers, it suddenly heats up to more than a million degrees, becoming its atmosphere, or corona...The popular theories are based on heating caused by turbulence, and heating caused by a type of magnetic wave called ion cyclotron waves.“Both, however, have some problem – turbulence struggles to explain why Hydrogen, Helium and Oxygen in the gas become as hot as they do, while electrons remain surprisingly cold; while...
  • Physicists Think They've Finally Cracked Stephen Hawking's Famous Black Hole Paradox

    03/18/2022 12:33:55 PM PDT · by Red Badger · 24 replies
    https://www.sciencealert.com ^ | 18 March 2022 | MIKE MCRAE
    <p>At the heart of every black hole sits a problem. As they sizzle away into nothingness over the eons, they take with them a small piece of the Universe. Which, quite frankly, just isn't in the rule book.</p><p>It's a paradox the late Stephen Hawking left us with as a part of his revolutionary work on these monstrous objects, inspiring researchers to tinker with potential solutions for the better part of half a century.</p>
  • Creating sub-1-nm gate lengths for MoS2 transistors

    03/14/2022 1:57:12 PM PDT · by ShadowAce · 23 replies
    TechXplore ^ | 14 March 2022 | Bob Yirka
    The 0.34 nm gate-length side-wall monolayer MoS2 transistor device structure and characterization. Credit: Nature (2022). DOI: 10.1038/s41586-021-04323-3A team of researchers working at Tsinghua University in China has created a sub-1-nm gate in a MoS2 transistor. In their paper published in the journal Nature, the group outlines how they created the super tiny gate and explains why they believe it will be difficult for anyone to beat their record. For most of the history of microcomputing, Moore's Law has held up—researchers and engineers have managed to double the speed and capability of computers regularly by reducing the size of their components....
  • Chicago Private School Injected Race Into Physics Class, Then Tracked Whether The Indoctrination Worked

    03/09/2022 7:57:42 AM PST · by george76 · 18 replies
    The Federalist ^ | MARCH 04, 2022 | Spencer Lindquist
    The Latin School of Chicago appears to have been a breeding ground for critical race curricula that later gave excuses for political violence. lthough critical race theory has only come to the forefront of American politics in the last year, an email obtained by The Federalist dating back to 2016 proves the divisive ideology has been entrenched in American K-12 schools for much longer, sometimes where some least expect it. An email from Elizabeth Denevi, who at the time was the director of studies and professional development at the Latin School of Chicago, shows the private school injected CRT into...
  • Former fusion scientist on why we won't have fusion power by 2040

    03/07/2022 10:44:21 PM PST · by SunkenCiv · 23 replies
    YouTube ^ | September 10, 2021 | Improbable Matter
    I refute some very optimistic claims about fusion power and discuss some of the challenges in making this long-sought after technology a reality.Former fusion scientist on why we won't have fusion power by 2040September 10, 2021 | Improbable Matter