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Keyword: physics

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  • New measurement yields smaller proton radius

    11/08/2019 5:35:28 AM PST · by zeestephen · 49 replies
    Science Daily ^ | 06 November 2019
    Using the first new method in half a century for measuring the size of the proton via electron scattering, scientists have produced a new value for the proton's radius in a new experiment...The new value for the proton radius that was obtained is 0.831 fm, which is smaller than the previous electron-scattering value of 0.88 fm...
  • Space shock as 'unidentified object' feeding mysterious black hole leaves experts baffled

    10/16/2019 10:46:11 AM PDT · by Innovative · 37 replies
    UK Express ^ | Oct. 16, 2019 | Brian McGleenon
    A MYSTERIOUS supermassive black hole in a distant galaxy is spitting high energy particles after being fed by an object that has never been seen before. The baffling phenomenon has put existing theoretical models on their head, and astrophysicists are puzzled as to what is creating such a regular excretion of material from within the bowels of this supermassive black hole. According to the paper titled, 'Nine-hour X-ray quasi-periodic eruptions from a low-mass black hole galactic nucleus', the energy erupts from the black hole every nine hours and last for one hour and it's that precision which has baffled scientists.
  • String Theory Does Not Win a Nobel, and I Win a Bet

    10/09/2019 8:12:24 AM PDT · by C19fan · 19 replies
    Scientific America ^ | October 9, 2019 | John Horgan
    I just won a bet I made in 2002 with physicist Michio Kaku. I bet him $1,000 that “by 2020, no one will have won a Nobel Prize for work on superstring theory, membrane theory, or some other unified theory describing all the forces of nature.” This year’s Nobel Prize in Physics, which recognized solid work in cosmology (yay Jim Peebles!) and astronomy, was Kaku’s last chance to win before 2020. Kaku and I made the bet under the auspices of Long Bets, a “public arena for enjoyably competitive predictions, of interest to society, with philanthropic money at stake.” Long...
  • Splitting the Universe: Hugh Everett blew up quantum mechanics with his Many-Worlds theory [tr]

    09/12/2019 9:05:16 AM PDT · by C19fan · 31 replies
    Aeon ^ | September 11, 2019 | Sean Carroll
    One of the most radical and important ideas in the history of physics came from an unknown graduate student who wrote only one paper, got into arguments with physicists across the Atlantic as well as his own advisor, and left academia after graduating without even applying for a job as a professor. Hugh Everett’s story is one of many fascinating tales that add up to the astonishing history of quantum mechanics, the most fundamental physical theory we know of. Everett’s work happened at Princeton in the 1950s, under the mentorship of John Archibald Wheeler, who in turn had been mentored...
  • Physics is racist and sexist?

    09/02/2019 9:34:36 AM PDT · by ELS · 36 replies
    American Thinker ^ | September 1, 2019 | Ethel C. Fenig
    A new school year is about to begin and along with it comes a new solution to a new problem. And Stanford University, the Harvard of the West, is proudly taking credit for discovering the problem: that people in science aren't diverse and inclusive enough. Horrors. But, being a renowned research university, it is proudly offering its solution, called: PUWMAS. That's its unprepossessing acronym for Physics Undergraduate Women and Gender Minorities at Stanford, what it calls "Stanford’s first undergraduate group dedicated to forming an inclusive community of underrepresented minorities in physics." -- snip -- What does that mean? Well, along...
  • Physicists Wonder: Why Has No One Been Killed by Dark Matter?

    07/18/2019 6:09:07 AM PDT · by C19fan · 97 replies
    Gizmodo ^ | July 17, 2019 | Ryan F. Mandelbaum
    The fact that no one has died from being struck by dark matter is enough proof to rule out certain ideas about the mysterious stuff, according to one new theory paper. There’s a conundrum facing physicists: Most of the universe’s mass appears to be missing, based on observations of the universe’s structure, how galaxies move, and how they seem to warp distant light. Thousands of physicists are now hunting for what might be producing these effects. But the mere fact that we’re alive here on Earth can offer some insight as to what dark matter isn’t, and the researchers behind...
  • Researchers build transistor-like gate for quantum information processing – with qudits

    07/16/2019 4:14:38 PM PDT · by BenLurkin · 38 replies
    Phys.org ^ | 07/16/2019
    The more entanglement in the so-called Hilbert space—the realm where quantum information processing can take place—the better. Previous photonic approaches were able to reach 18 qubits encoded in six entangled photons in the Hilbert space. Purdue researchers maximized entanglement with a gate using four qudits—the equivalent of 20 qubits—encoded in only two photons. In quantum communication, less is more. "Photons are expensive in the quantum sense because they're hard to generate and control, so it's ideal to pack as much information as possible into each photon," said Poolad Imany, a postdoctoral researcher in Purdue's School of Electrical and Computer Engineering....
  • Measuring light and vacuum fluctuations from a time flow perspective

    07/10/2019 10:12:29 PM PDT · by ETL · 24 replies
    Phys.org ^ | July 10, 2019 | Ingrid Fadelli, Phys.org
    Some of the greatest unanswered questions about the nature of the universe are related to light, the vacuum (i.e. space where neither matter nor radiation exists), and their relationship with time. In the past, physicists and philosophers have addressed a variety of complex questions, for instance, what is the nature of the vacuum, and how is the propagation of light connected to the passing of time? Researchers at the University of Konstanz have recently carried out a study exploring the quantum states of light and vacuum fluctuations, as well as their interplay with time. Their paper, published in Nature Physics,...
  • What Is The Smallest Possible Distance In The Universe?

    06/27/2019 6:41:24 AM PDT · by C19fan · 47 replies
    Forbes ^ | June 26, 2019 | Ethan Siegel
    If you wanted to understand how our Universe operates, you'd have to examine it at a fundamental level. Macroscopic objects are made up of particles, which can only themselves be detected by going to subatomic scales. To examine the Universe's properties, you must to look at the smallest constituents on the smallest possible scales. Only by understanding how they behave at this fundamental level can we hope to understand how they join together to create the human-scale Universe we're familiar with. But you can't extrapolate what we know about even the small-scale Universe to arbitrarily small distance scales. If we...
  • Researchers explain visible light from 2-D lead halide perovskites

    06/24/2019 9:17:03 PM PDT · by BenLurkin · 17 replies
    phys.org ^ | Jeannie Kever, University of Houston
    Researchers drew attention three years ago when they reported that a two-dimensional perovskite—a material with a specific crystal structure—composed of cesium, lead and bromine emitted a strong green light. Crystals that produce light on the green spectrum are desirable because green light, while valuable in itself, can also be relatively easily converted to other forms that emit blue or red light, making it especially important for optical applications ranging from light-emitting devices to sensitive diagnostic tools. But there was no agreement about how the crystal, CsPB2Br5, produced the green photoluminescence. Now, however, researchers from the United States, Mexico and China,...
  • Atheist Scientists Now Acknowledge God, Just Refuse to Call Him That

    06/11/2019 7:45:48 PM PDT · by CCC News · 25 replies
    String theorists, astrophysicists, and metaphysicists are just like 1st century Athenians. They now acknowledge an "unknown" God (what they call the 10th, 11th, or 26th dimension), they just won't submit to Him or acknowledge that He has anything to say to them. It seems that all of these theories require the "top" dimension (the 10th, 11th, or 26th, depending on the theory) to have the following properties: No beginning or endUnlimited energyUnlimited informationAll encompassing In biblical Christianity we'd call those: EternalOmnipotentOmniscientOmnipresent Science has come full circle, begrudgingly acknowledging what believers and theologians have already known for thousands of years. Check...
  • Stephen Hawking was right: 'Black hole' created in a lab confirms the late physicist's [tr]

    05/30/2019 3:59:10 AM PDT · by C19fan · 29 replies
    UK Daily Mail ^ | May 29, 2019 | James Pero
    After the first-ever image of a black hole confirmed theories posited by Einstein, it's the late scientist Stephen Hawking's turn to have parts of his life's work vindicated. In a paper published in Nature, scientists say that have verified the scientist's namesake theory, Hawking Radiation, which hypothesized that black holes emit radiation from their surfaces due to a mix of different factors regarding quantum physics and gravity. To verify the theory, scientists at the Technion-Israel Institute of Technology turned to what sounds like mad science: creating their own black hole.
  • Researchers crack an enduring physics enigma

    05/28/2019 11:36:46 AM PDT · by BenLurkin · 48 replies
    Phys.org ^ | Ecole Polytechnique Federale de Lausanne
    For decades, physicists, engineers and mathematicians have failed to explain a remarkable phenomenon in fluid mechanics: the natural tendency of turbulence in fluids to move from disordered chaos to perfectly parallel patterns of oblique turbulent bands. This transition from a state of chaotic turbulence to a highly structured pattern was observed by many scientists, but never understood. For decades, physicists, engineers and mathematicians have failed to explain a remarkable phenomenon in fluid mechanics: the natural tendency of turbulence in fluids to move from disordered chaos to perfectly parallel patterns of oblique turbulent bands. This transition from a state of chaotic...
  • Dark Matter Scientists Observe the Rarest Event in History

    04/29/2019 8:47:54 AM PDT · by C19fan · 70 replies
    Popular Mechanics ^ | April 27, 2019 | Avery Thompson
    Researchers at the XENON dark matter observatory have spotted something incredibly rare. Unfortunately, it’s not dark matter, but it is the next best thing. The detectors at the observatory have spotted the decay of xenon-124, the rarest event ever recorded in human history. The XENON experiment is designed to detect dark matter, which is not an easy task. The reason that dark matter is so mysterious is that it pretty much never does anything, which makes it hard to spot. Dark matter doesn’t give off light, or have any sort of magnetic field, and it almost never interacts with normal...
  • Inside Giant Atom Smasher, Physicists See the Impossible: Light Interacting with Light

    04/25/2019 9:24:13 AM PDT · by BenLurkin · 42 replies
    Lie Science ^ | April 25, 2019 07:14am ET | Paul Sutter,
    The laws of physics are such that one photon just passes by another with zero interaction. But in a new experiment inside the world's most powerful atom smasher, researchers got a glimpse of the impossible: photons bumping into each other. The answer lies in one of the most inscrutable and yet delicious aspects of modern physics, and it goes by the funky name of quantum electrodynamics. In this picture of the subatomic world, the photon isn't necessarily a photon. Well, at least, it's not always a photon. Particles like electrons and photons and all the other -ons continually flip back...
  • This is the slowest radioactive decay ever spotted

    04/24/2019 8:25:43 PM PDT · by LibWhacker · 33 replies
    Science News ^ | 4/24/19 | Maria Temming
    It takes 1 trillion times the age of the universe for a xenon-124 sample to shrink by half For the first time, researchers have directly observed an exotic type of radioactive decay called two-neutrino double electron capture.The decay, seen in xenon-124 atoms, happens so sparingly that it would take 18 sextillion years (18 followed by 21 zeros) for a sample of xenon-124 to shrink by half, making the decay extremely difficult to detect. The long-anticipated observation of two-neutrino double electron capture, reported in the April 25 Nature, lays the groundwork for researchers to glimpse a yet unseen, even rarer version...
  • Why Are Women Under-Represented in Physics?

    04/19/2019 4:32:59 AM PDT · by reaganaut1 · 102 replies
    Quillette ^ | April 16, 2019 | Alessandro Strumia
    ... Based on the data we found and on previous literature in this field, gender differences in representation and productivity can be interpreted in terms of two main causal factors: Gender differences in interests; Higher male variability (HMV). Needless to say, “for every complex natural phenomenon there is a simple, elegant, compelling, wrong explanation” (Thomas Gold) and when dealing with complex systems any simple explanation can easily be inadequate, including explanations that attribute gender disparities exclusively to sexual discrimination. But I believe the data can be explained without invoking sexual discrimination and by focusing instead on the two factors above....
  • Why our Understanding of Reality is False

    04/18/2019 5:20:21 PM PDT · by vannrox · 81 replies
    Metallicman ^ | 18APR19 | Editorial Staff
    One of the reasons why humans are handicapped in our understanding of reality is because of our reliance on the “scientific method”. It is a system based on observation. The problem with this method is that our understanding of reality is corrupted by the limits imposed by observation. Indeed, as well well know, it is the perception of the observer that changes our reality. This is a well understood rule. If you the reader, don’t “get it”, then you need to study quantum mechanics 101. For in the last two decades the entire foundation of our understanding of reality has...
  • Found: A Quadrillion Ways for String Theory to Make Our Universe

    03/29/2019 5:59:07 AM PDT · by C19fan · 27 replies
    Scientific America ^ | March 28, 2019 | Anil Ananthaswamy
    Physicists who have been roaming the “landscape” of string theory—the space of zillions and zillions of mathematical solutions of the theory, where each solution provides the kinds of equations physicists need to describe reality—have stumbled upon a subset of such equations that have the same set of matter particles as exists in our universe. But this is no small subset: there are at least a quadrillion such solutions, making it the largest such set ever found in string theory.
  • Heat "waves" detected moving through pencil lead

    03/16/2019 4:12:49 AM PDT · by zeestephen · 10 replies
    Watts Up With That ^ | 15 March 2019 | Anthony Watts
    At temperatures of 120 kelvin, or -240 degrees Fahrenheit, they saw clear signs that heat can travel through graphite in a wavelike motion. Points that were originally warm are left instantly cold, as the heat moves across the material at close to the speed of sound. The behavior resembles the wavelike way in which sound travels through air, so scientists have dubbed this exotic mode of heat transport "second sound."