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Keyword: physics

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  • Ask Ethan: Why Is There A Limit To What Physics Can Predict?

    04/10/2017 11:47:52 AM PDT · by C19fan · 16 replies
    Forbes ^ | April 8, 2017 | Ethan Siegel
    If you divide the matter in the Universe into smaller and smaller constituents, you'll eventually reach a limit when you hit a fundamental, indivisible particle. All macroscopic objects can be divided into molecules, then atoms, then electrons (which are fundamental) and nuclei, then protons and neutron, and finally, inside them, there are quarks and gluons. Electrons, quarks and gluons are examples of fundamental particles that cannot be divided any smaller. But how is it possible that space and time itself have those very same limits? Derek Kueter wants to know: Why are there these units (Planck units) which you can't...
  • Why Georges Lemaître Should Be as Famous as Einstein

    03/07/2017 6:01:33 AM PST · by C19fan · 11 replies
    Real Clear Science ^ | March 7, 2017 | Ross Pomeroy
    YOUNG STUDENTS lucky enough to benefit from a science education will likely recognize Albert Einstein, Isaac Newton, Galileo Galilei, Charles Darwin, Marie Curie, or Gregor Mendel. But ask them about Georges Lemaître and they'd probably be stumped. Indeed, the man who first proposed that the universe is expanding and formulated the theory of the Big Bang is scarcely recognized by Google. Search for "famous scientists" and scroll through the horizontal list that pops up. Lemaître is nowhere to be seen.
  • Richard Muller on why the flow of time is not an illusion

    02/11/2017 7:10:41 AM PST · by MtnClimber · 85 replies
    Physics Today ^ | 10 Feb, 2017 | Melinda Baldwin
    The physicist and author argues that cosmologists should take the concept of time more seriously and talks about becoming a “converted skeptic” on climate change. ....MULLER: The flow of time does not exist in the usual spacetime diagram of physics. Time is mysterious; in any relativistic coordinate system, it is linked to space. And yet time is different—and I mean much more than simply a sign in the metric. Time flows. Choose any coordinate system and you can stand still in space but not in time. That different behavior breaks the otherwise glorious spacetime symmetry. Moreover, there is a special...
  • Scientists Create A New Kind Of Matter: Time Crystals

    01/29/2017 8:28:33 PM PST · by BenLurkin · 18 replies ^ | Jan 28, 2017 | Sophie Weiner
    Now, two teams of researchers have figured out that crystals' repeating patterns can also exist through time. These "time crystals," detailed in a new paper in Physical Review Letter, are an entirely new kind of matter, one that can never reach equilibrium. To create the time crystals, researchers at University of Maryland hooked together 10 ytterbium atoms and hit them with two lasers multiple times to keep them out of equilibrium. Though the atoms did settle into a pattern, they could not reach equilibrium, meaning that the crystals perpetually remain in motion, though they don't contain any energy. Almost all...
  • Scientists have confirmed a brand new form of matter: time crystals

    01/29/2017 5:02:45 AM PST · by Mechanicos · 48 replies
    Science Alert ^ | 28 JAN 2017 | FIONA MACDONALD
    For months now, there's been speculation that researchers might have finally created time crystals - strange crystals that have an atomic structure that repeats not just in space, but in time, putting them in perpetual motion without energy. ... But time crystals have a structure that repeats in time, not just in space. And it keep oscillating in its ground state. ...
  • Princeton Physics Professor Discredits Anthropogenic Climate Change Theory

    12/23/2016 7:21:23 PM PST · by Coleus · 50 replies
    Princeton Physics Professor Discredits Anthropogenic Climate Change Theory  
  • Pilot Wave Theory and Quantum Realism (PBS video)

    12/01/2016 3:16:26 PM PST · by Reeses · 11 replies
    PBS Digital Studios ^ | Nov 30, 2016 | PBS Digital Studios
    There’s one interpretation of the meaning of quantum mechanics that manages to skip a lot of the unphysical weirdness of the mainstream interpretations: it's de Broglie-Bohm pilot wave theory. There are some pretty out-there explanations for the processes at work behind the incredibly successful mathematics of quantum mechanics - things are both waves and particles at the same time, the act of observation defines reality, cats are alive and dead, or even: the universe is constantly splitting into infinite alternate realities. The weird results of quantum experiments seem to demand weird explanations of the nature of reality. In this episode,...
  • Gravity may have chased light in the early universe

    11/28/2016 8:22:13 AM PST · by MtnClimber · 39 replies
    New Scientist ^ | 23 Nov, 2016 | Michael Brooks
    It’s supposed to be the most fundamental constant in physics, but the speed of light may not always have been the same. This twist on a controversial idea could overturn our standard cosmological wisdom. In 1998, Joao Magueijo at Imperial College London, proposed that the speed of light might vary, to solve what cosmologists call the horizon problem. This says that the universe reached a uniform temperature long before heat-carrying photons, which travel at the speed of light, had time to reach all corners of the universe. The standard way to explain this conundrum is an idea called inflation, which...
  • Variable, Not Constant: Speed Of Light Theory Challenging Einstein’s Physics Can Now Be Tested

    11/27/2016 11:30:21 AM PST · by BenLurkin · 56 replies
    Tech Times ^ | 27 November 2016, 1:16 am EST | Dianne Depra
    Researchers suggesting that the speed of light varies have come up with a numerical prediction that will allow their theory to be tested. Many theories in physics are built upon the idea that the speed of light is at a constant rate, but João Magueijo and Niayesh Afshordi think otherwise. In a paper published in the journal Physical Review D, they detailed the creation of an exact figure on the spectral index, a model that can be used to determine if their theory is valid or not. All structures in the universe today were created when fluctuations occurred in the...
  • Why quantum mechanics might need an overhaul

    11/26/2016 6:19:48 PM PST · by TigerLikesRooster · 61 replies
    Science News ^ | November 4, 2016 | Tom Siegfried
    Why quantum mechanics might need an overhaul by Tom Siegfried 3:37pm, November 4, 2016 Nobel laureate Steven Weinberg says current debates suggest need for new approach to comprehend reality SAN ANTONIO ? Quantum mechanics is science’s equivalent of political polarization. Voters either take sides and argue with each other endlessly, or stay home and accept politics as it is. Physicists either just accept quantum mechanics and do their calculations, or take sides in the never-ending debate over what quantum mechanics is actually saying about reality. Steven Weinberg used to be happy with quantum mechanics as it is and didn’t worry...
  • Even physicists are 'afraid' of mathematics

    11/13/2016 7:25:21 AM PST · by LouieFisk · 72 replies
    ScienceDaily ^ | November 11, 2016 | University of Exeter
    Physicists avoid highly mathematical work despite being trained in advanced mathematics, new research suggests. The study, published in the New Journal of Physics, shows that physicists pay less attention to theories that are crammed with mathematical details.
  • Five Independent Signs Of New Physics In The Universe

    11/06/2016 8:17:45 AM PST · by MtnClimber · 23 replies
    Forbes ^ | 4 Nov, 2016 | Ethan Siegel
    Since the Large Hadron Collider at CERN turned on, it’s brought with it an incredible slew of results. Large numbers of rare, exotic and unstable particles have been created, and their decays have been measured to unprecedented precision. The Higgs boson has been created and observed to have a mass of 126 GeV/c2, branching and decaying in exactly the ratios the Standard Model predicts. As it now stands, we’ve detected every particle and antiparticle predicted by the most successful particle physics theory of all time. Unless we get hit by a big physics surprise, the LHC will become renowned for...
  • Microsoft thinks time crystals may be viable after all... Movement without energy?

    09/12/2016 5:02:41 PM PDT · by dayglored · 53 replies
    The Register ^ | Sep 12, 2016 | Katyanna Quach
    Microsoft researchers have teamed up with physicists from the University of California, Santa Barbara, to show how time crystals might be possible. First proposed by Nobel-prize winning theoretical physicist Frank Wilczek, time crystals are hypothetical systems that spontaneously break time-translational symmetry (TTS) – a fundamental symmetry in physics. In plain language, they exhibit tiny movements without using energy. Crystals have a rigid arrangement of atoms that break translational symmetry. Their structure is not symmetrical in space, unlike a sphere, which looks the same from all directions. Time crystals break the symmetry of space and time. Wilczek considered a group of...
  • In 1975, a Cat Co-Authored a Physics Paper

    09/05/2016 6:29:55 PM PDT · by MtnClimber · 14 replies
    Atlas Obscura ^ | 30, Aug, 2016 | Eric Grundhauser
    When one reads a physics paper in an esteemed journal, one does not generally wonder if it was written by a cat. But such was the case for an article in the 1970s credited to co-author F.D.C. Willard—the Cat Who Published. Jack H. Hetherington was a professor of physics at Michigan State University in 1975, when he finished what would become an influential and often-cited physics paper. The academic writing, entitled, Two-, Three-, and Four-Atom Exchange Effects in bcc 3He, was an in-depth exploration of atomic behavior at different temperatures. It would have flown over the heads of most lay...
  • This device turns neon plasma into natural patterns

    08/23/2016 8:11:24 PM PDT · by smokingfrog · 10 replies
    PBS ^ | 8-23-2016 | Leigh Anne Tiffany
    From zebra stripes to a honeycomb lattice, nature features breathtaking patterns. Now, physicists based in China have found a way to recreate these natural motifs in 3-D — using just a little electricity. Their new device discharges plasma — air and argon gas charged with electricity — or the same stuff found in neon lights. Using different voltages, the researchers were able to create various 3-D shapes in the plasma. “To experts, this work could advance the development of plasma physics,” co-inventor Lifang Dong of Hebei University told the NewsHour. “But to non-experts, it could explain a whole range of...
  • Scientists on verge of discovering new fifth force that will change how we see the universe

    08/16/2016 6:53:07 PM PDT · by rickmichaels · 26 replies
    National Post ^ | Aug. 16, 2016 | John-Michael Schneider
    Since the mid-1970s, modern physics has rested on the knowledge of four fundamental forces of nature: gravity, electromagnetism, the strong nuclear force, and the weak nuclear force. Now scientists are on the verge of discovering a fifth force of nature, which could change the field of physics forever. According to a recent paper published by University of California physicists in the peer-reviewed journal Physical Review Letters, what physicists thought was a new particle of matter could be a new force altogether.
  • 5th force of nature possibly discovered, US physicists say

    08/16/2016 5:45:02 AM PDT · by Bloody Sam Roberts · 68 replies
    RT America ^ | Unknown
    Scientists are ecstatic over the fact that they may have just discovered the fifth fundamental force of nature. The possible discovery of a previously-unknown subatomic particle looks set to finally bring the elusive dark matter into the mix. The discovery centers on a new type of boson that possesses characteristics previously unseen in particles. Furthermore, its existence casts doubt upon whether the known ‘sector’ of matter and particles exists alongside a ‘dark’ sector – both interacting with each other via another, unseen force.“If true, it's revolutionary,” said Jonathan Feng, professor of physics & astronomy at the University of California, Irvine,...
  • Black hole made in the lab shows signs of quantum entanglement

    08/15/2016 8:54:32 PM PDT · by brucedickinson · 42 replies
    New Scientist ^ | 8-15-2016 | Rebecca Boyle
    Steinhauer created a sonic black hole using a quantum state of supercold fluid called a Bose-Einstein condensate. The fluid flows through a tube in which lasers constrain the flow at two different energy levels, creating a kind of waterfall. Atoms reach supersonic speeds when they spill over its edge. This serves as the model event horizon. To measure Hawking radiation, he pinged the fluid with a short laser pulse. This created a sound particle known as a phonon, along with a partner particle, near the horizon – just as Hawking suggested happens near a real black hole. He then took...
  • Just a burp: Intriguing hints of physics particle evaporate

    08/06/2016 7:23:04 PM PDT · by Olog-hai · 13 replies
    Associated Press ^ | Aug 6, 2016 5:31 PM EDT | Seth Borenstein
    Eight months after raising hopes that they may have found an intriguing new particle that cannot be explained by the existing main physics theory, disappointed scientists are saying: Never mind. It was just a statistical burp, not a breakthrough, researchers reported Friday. […] Early unconfirmed readings of a new particle in December by physicists at the center, called CERN, set the physics world abuzz. Scientists there had discovered the Higgs boson or “God particle” in 2012, and two new readings from the Large Hadron Collider made it seem as though they may had found a revolutionary new particle. …
  • Cats seem to grasp the laws of physics

    06/14/2016 2:05:53 PM PDT · by BenLurkin · 56 replies ^ | 06/14/2016
    Previous work conducted by the Japanese team established that cats predict the presence of invisible objects based on what they hear. In the present study, the researchers wanted to find out if cats use a causal rule to infer if a container holds an object, based on whether it is shaken along with a sound or not. The team also wanted to establish if cats expect an object to fall out or not, once the container is turned over. Thirty domestic cats were videotaped while an experimenter shook a container. In some cases this action went along with a rattling...