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Keyword: stringtheory

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  • Earthbound Antimatter Mystery Deepens After Scientists Rule Out Pulsar Source

    11/17/2017 9:19:32 AM PST · by BenLurkin · 29 replies
    Space.com ^ | November 16, 2017 | Harrison Tasoff,
    The recent finding, detailed in the journal Science today (Nov. 17), concerns positrons, the antimatter complements of electrons. High-energy particles, usually protons, traveling across the galaxy can create pairs of positrons and electrons when they interact with dust and gas in space, study co-author Hao Zhou, at Los Alamos National Lab, told Space.com. In 2008, the space-based PAMELA detector measured unexpectedly high numbers of earthbound positrons. This was about 10 times what they were expecting to see, according to Zhou. ... Zhou's team made detailed measurements of the gamma-rays coming from the direction of two nearby pulsars — Geminga and its companion...
  • Quantum computers take a step forward with a 50-qubit prototype

    11/13/2017 10:11:56 PM PST · by ETL · 33 replies
    ScienceNews.com ^ | November 10, 2017 | Emily Conover
    Bit by qubit, scientists are edging closer to the realm where quantum computers will reign supreme.IBM is now testing a prototype quantum processor with 50 quantum bits, or qubits, the company announced November 10. That’s around the number needed to meet a sought-after milestone: demonstrating that quantum computers can perform specific tasks that are beyond the reach of traditional computers. Unlike standard bits, which represent either 0 or 1, qubits can indicate a combination of the two, using what’s called a quantum superposition. This property allows quantum computers to perform certain kinds of calculations more quickly. But because quantum bits...
  • Visionary Mathematician Vladimir Voevodsky Dies at 51

    11/12/2017 8:55:36 PM PST · by LibWhacker · 19 replies
    Quanta Magazine ^ | 10/11/17 | Kevin Hartnett
    Voevodsky’s friends remember him as constitutionally unable to compromise on the truth — a quality that led him to produce some of the most important mathematics of the 20th century. Vladimir Voevodsky at the Institute for Advanced Study in 2016. In math as in life, Vladimir Voevodsky played by his own rules. Voevodsky, a Russian-born mathematical prodigy, produced a string of daring insights in the 1990s that revolutionized one of the central fields of mathematics and established him at the pinnacle of his profession. His work continues to reverberate today. On Sept. 30, Voevodsky died in Princeton, New Jersey, at...
  • Bizarre 3-Year-Long Supernova Defies Our Understanding of How Stars Die

    11/08/2017 2:21:07 PM PST · by BenLurkin · 18 replies
    Space.com ^ | November 8, 2017 01:00pm ET | Harrison Tasoff,
    Supernova iPTF14hls was unremarkable when first detected by a partner telescope in San Diego on Sept. 22, 2014. The light spectrum was a textbook example of a Type II-P supernova, the most common type astronomers... The observatory was in the middle of a 7.5-year collaborative survey, so Arcavi focused on more-promising objects. But in February, 2015... a student working for Arcavi that winter, noticed the object had become brighter over the past five months. "He showed me the data," Arcavi said, "and he [asked], 'Is this normal?' and I said, 'Absolutely not. That is very strange. Supernovae don't do that,'"...
  • Rookie UC Santa Cruz Astronomer David Coulter Hits Paydirt

    11/08/2017 9:35:05 PM PST · by nickcarraway · 5 replies
    Santa Cruz Sentinel ^ | 11/03/17 | Jondi Gumz
    David Coulter was in Copenhagen when he got an email that catapulted him into the stars. Coulter, 36, is a self-taught programmer. He spent 10 years in industry jobs, then left for graduate studies in astronomy and astrophysics at UC Santa Cruz, which operates Lick Observatory on Mount Hamilton. “I just wanted to learn about outer space,” he said. He picked the right place. The second-year grad student found himself on a team that was the first to take images of neutron stars merging, beating a group from Harvard, perhaps explaining the origin of metals such as gold and uranium....
  • Groundbreaking 'quarksplosion' discovery can make ten times as much energy as nuclear fusion

    11/07/2017 7:05:11 PM PST · by sparklite2 · 96 replies
    DAILYMAIL.COM ^ | 7 November 2017 | CHEYENNE MACDONALD
    Study found elementary particles called quarks release energy when fused Certain types can produce eight times more energy than hydrogen fusion It's so powerful that the researchers at first hesitated to publish the work
  • The Oracle of Arithmetic

    07/04/2016 4:38:42 PM PDT · by MtnClimber · 33 replies
    Quanta ^ | 28 Jun, 2016 | Erica Klarreich
    At 28, Peter Scholze is uncovering deep connections between number theory and geometry. In 2010, a startling rumor filtered through the number theory community and reached Jared Weinstein. Apparently, some graduate student at the University of Bonn in Germany had written a paper that redid “Harris-Taylor” — a 288-page book dedicated to a single impenetrable proof in number theory — in only 37 pages. The 22-year-old student, Peter Scholze, had found a way to sidestep one of the most complicated parts of the proof, which deals with a sweeping connection between number theory and geometry. “It was just so stunning...
  • Einstein Proved Right on Gravity—Again

    04/25/2013 1:10:04 PM PDT · by SeekAndFind · 43 replies
    Wall Street Journal ^ | 04/25/2013 | Gautam Naik
    Scientists have subjected Albert Einstein's famous theory of gravity to its toughest real-world test so far—and it has prevailed. Einstein's general theory of relativity states that objects with mass cause a curvature in space-time, which we perceive as gravity. Space-time, according to Einstein's theories of relativity, is a four-dimensional fabric woven together by space and time. For example, a bowling ball causes a dent in a mattress, and that dent changes the otherwise straight motion of a nearby marble on the same mattress. Similarly, the mass of the sun distorts the space-time around it. A body with less mass, like...
  • Uranium Seawater Extraction Makes Nuclear Power Completely Renewable

    07/01/2016 4:39:49 PM PDT · by 2ndDivisionVet · 39 replies
    Forbes ^ | July 1, 2016 | James Conca
    America, Japan and China are racing to be the first nation to make nuclear energy completely renewable. The hurdle is making it economic to extract uranium from seawater, because the amount of uranium in seawater is truly inexhaustible. And it seems America is in the lead. New technological breakthroughs from DOE’s Pacific Northwest (PNNL) and Oak Ridge (ORNL) national laboratories have made removing uranium from seawater within economic reach and the only question is – when will the source of uranium for our nuclear power plants change from mined ore to seawater extraction? Nuclear fuel made with uranium extracted from...
  • Scientist eyes 39-day voyage to Mars

    02/26/2010 2:39:44 PM PST · by NormsRevenge · 40 replies · 989+ views
    AFP on Yahoo ^ | 2/26/10 | Jean-Louis Santini
    WASHINGTON (AFP) – A journey from Earth to Mars could eventually take just 39 days -- cutting current travel time nearly six times -- according to a rocket scientist who has the ear of the US space agency. Franklin Chang-Diaz, a former astronaut and a physicist at the Massachusetts Institute of Technology (MIT), says reaching the Red Planet could be dramatically quicker using his high-tech VASIMR rocket, .. The Variable Specific Impulse Magnetoplasma Rocket -- to give its full name -- is quick becoming a centerpiece of NASA's future strategy as it looks to private firms to help meet the...
  • The 17 equations that changed the world

    06/29/2016 8:33:17 PM PDT · by MtnClimber · 65 replies
    World Economic Forum ^ | 4 Apr, 2016 | Andy Kiersz
    In 2012, Mathematician Ian Stewart came out with an excellent and deeply researched book titled "In Pursuit of the Unknown: 17 Equations That Changed the World." His book takes a look at the most pivotal equations of all time, and puts them in a human, rather than technical context. "Equations definitely can be dull, and they can seem complicated, but that’s because they are often presented in a dull and complicated way," Stewart told Business Insider. "I have an advantage over school math teachers: I'm not trying to show you how to do the sums yourself." ... Stewart continued that...
  • Why ultra-powerful radio bursts are the most perplexing mystery in astronomy

    06/28/2016 6:06:48 PM PDT · by MtnClimber · 25 replies
    Nature ^ | 28 Jun, 2016 | Elizabeth Gibney
    No astronomer had ever seen anything like it. No theorist had predicted it. Yet there it was — a 5-millisecond radio burst that had arrived on 24 August 2001 from an unknown source seemingly billions of light years away. “It was so bright, we couldn't just dismiss it,” says Duncan Lorimer, who co-discovered the signal1 in 2007 while working on archived data from the Parkes radio telescope in New South Wales, Australia. “But we didn't really know what to do with it.” Such fleeting radio bursts usually came from pulsars — furiously rotating neutron stars whose radiation sweeps by Earth...
  • Sleeping Black Hole Wakes To Devour Passing Star

    06/26/2016 6:48:55 AM PDT · by BenLurkin · 30 replies
    It happened about 3.9 billion light years from Earth in the direction of the Draco constellation, and was spotted using high-energy X-ray data from NASA's public archives. The black hole, with a mass a few million times larger than the sun, gorged on the star at a rate 100 times greater than a theoretical maximum known as the Eddington limit. The majority of supermassive black holes are dormant, meaning they are not actively consuming matter. But occasionally a star drifts too close to a dormant black hole and a 'tidal disruption event' begins. Authors of the new research say their...
  • String Theory Co-Founder: Sub-Atomic Particles Are Evidence the Universe Was Created

    06/20/2016 6:11:57 AM PDT · by xzins · 170 replies
    CNS ^ | June 17, 2016 | Barbara Hollingsworth
    Dr. Michio Kaku, a theoretical physicist at the City College of New York (CUNY) and co-founder of String Field Theory, says theoretical particles known as “primitive semi-radius tachyons” are physical evidence that the universe was created by a higher intelligence. After analyzing the behavior of these sub-atomic particles - which can move faster than the speed of light and have the ability to “unstick” space and matter – using technology created in 2005, Kaku concluded that the universe is a “Matrix” governed by laws and principles that could only have been designed by an intelligent being. “I have concluded that...
  • How to catch a ripple in spacetime

    06/19/2016 12:26:13 PM PDT · by MtnClimber · 16 replies
    Ideas.ted.com ^ | 17 Jun, 2016 | Janna Levin
    How do you build a real-world machine to test the most abstract of theories? Janna Levin talks with Rai Weiss, one of the original designers of LIGO, the four-kilometer-long instrument that has now twice detected the distant reverberations of two black holes crashing into one another. Janna Levin is a theoretical physicist — she works with pen and paper to turn the elegant rules of the universe into theory. Rainer Weiss, or Rai, as he’s known, is an experimental physicist — he thinks about how to find and measure something that may or may not exist outside of theory. Weiss...
  • New paper claims that the EM Drive doesn't defy Newton's 3rd law after all

    06/18/2016 6:21:05 PM PDT · by 2ndDivisionVet · 39 replies
    Science Alert ^ | June 16, 2016 | Fiona MacDonald
    So... it could still get us to Mars in 70 days? Physicists have just published a new paper that suggests the controversial EM drive - or electromagnetic drive - could actually work, and doesn't defy Newton's third law after all. In case you've missed the hype, here's a quick catch-up: a lot of space lovers are freaking out about the EM drive because of claims it could get humans to Mars in just 10 weeks, but just as many are sick of hearing about it, because, on paper at least, it doesn't work within the laws of physics. Despite that...
  • Fusion megaproject confirms 5-year delay, trims costs

    06/18/2016 5:58:51 PM PDT · by 2ndDivisionVet · 20 replies
    Science ^ | June 16, 2016 | Daniel Clery
    The ITER fusion reactor will fire up for the first time in December 2025, the €18-billion project’s governing council confirmed today. The date for “first plasma” is 5 years later than under the old schedule, and to get there the council is asking the project partners—China, the European Union, India, Japan, Russia, South Korea, and the United States—to cough up an extra €4 billion ($4.5 billion). “It is expected, if there are no objections, that we can approve [the schedule] by November and then we can move forward,” says ITER director general Bernard Bigot. ITER aims to show that it...
  • Did a supernova two million years ago brighten the night sky and give our ancestors cancer?

    06/17/2016 4:22:29 PM PDT · by rickmichaels · 39 replies
    Daily Mail ^ | June 17, 2016 | Cheyenne Macdonald
    Millions of years ago, a series of nearby supernovae sent radiation and debris raining down to Earth. The events left traces of radioactive iron-60 embedded in the sea floor and even on the Moon, and now, researchers are saying they may have had life-altering effects on the early inhabitants of our planet. At just hundreds of light-years away, two major stellar explosions may have spurred changes to the environment, and even increased the rates of cancer and mutation.
  • Astronomy Picture of the Day -- GW151226: A Second Confirmed Source of Gravitational Radiation

    06/15/2016 1:43:27 PM PDT · by SunkenCiv · 12 replies
    NASA ^ | Wednesday, June 15, 2016 | (see photo credit)
    Explanation: A new sky is becoming visible. When you look up, you see the sky as it appears in light -- electromagnetic radiation. But just over the past year, humanity has begun to see our once-familiar sky as it appears in a different type of radiation -- gravitational radiation. Today, the LIGO collaboration is reporting the detection of GW151226, the second confirmed flash of gravitational radiation after GW150914, the historic first detection registered three months earlier. As its name implies, GW151226 was recorded in late December of 2015. It was detected simultaneously by both LIGO facilities in Washington and Louisiana,...
  • A Second Set Of Gravitational Waves Have Been Detected

    06/16/2016 12:13:38 PM PDT · by zeestephen · 35 replies
    Watts Up With That ^ | 15 June 2016 | Anthony Watts
    Today, the LIGO collaboration is reporting the detection of GW151226, the second confirmed flash of gravitational radiation after GW150914, the historic first detection registered three months earlier.