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Keyword: stringtheory

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  • Are primordial black holes really giant gravitinos?

    01/06/2021 5:45:53 PM PST · by BenLurkin · 14 replies
    Live Science ^ | 01/06/2021 | Paul Sutter
    The largest black holes in the universe... sit at the centers of almost every galaxy in the cosmos. Even the Milky Way has one, a monster at 4 million solar masses, designated as Sagittarius A*. ...[A]s far as we know, the only way to form black holes is through the deaths of massive stars. When they die, they leave behind a black hole a few times more massive than the sun. To get to supergiant status, they have to merge with other black holes and/or consume as much gas as possible, bulking up all those millions of solar masses... Either...
  • Researchers achieve sustained, high-fidelity quantum teleportation

    12/30/2020 9:47:52 PM PST · by BenLurkin · 48 replies
    Phys.org ^ | December 29, 2020 | University of Chicago
    Quantum teleportation is a "disembodied" transfer of quantum states from one location to another. The quantum teleportation of a qubit is achieved using quantum entanglement, in which two or more particles are inextricably linked to each other. If an entangled pair of particles is shared between two separate locations, no matter the distance between them, the encoded information is teleported. In a paper published in PRX Quantum, the team presents for the first time a demonstration of a sustained, long-distance teleportation of qubits made of photons (particles of light) with fidelity greater than 90%. The qubits were teleported over a...
  • Neutrinos prove the Sun is doing a second kind of fusion in its core

    11/30/2020 8:27:45 AM PST · by LibWhacker · 20 replies
    Universe Today ^ | 11/28/2020 | Brian Koberlein
    Like all stars, our Sun is powered by the fusion of hydrogen into heavier elements. Nuclear fusion is not only what makes stars shine, it is also a primary source of the chemical elements that make the world around us. Much of our understanding of stellar fusion comes from theoretical models of atomic nuclei, but for our closest star, we also have another source: neutrinos created in the Sun’s core.Whenever atomic nuclei undergo fusion, they produce not only high energy gamma rays but also neutrinos. While the gamma rays heat the Sun’s interior over thousands of years, neutrinos zip out...
  • In major breakthrough, scientists announce detection of elusive solar particles produced by fusion

    11/28/2020 6:38:24 PM PST · by Red Badger · 27 replies
    Theory was first postulated in 1930s. Scientists this week announced the landmark detection of elusive particles generated from the fusion of hydrogen in the Sun, confirming a nearly-100-year-old theory about the ways in which many stars generate energy. In a paper published in Nature, a team of researchers called the Borexino Collaboration reported detecting the presence of neutrinos produced during the carbon–nitrogen–oxygen cycle of fusion deep within the Sun. The scientists stated that the energy produced in the CNO cycle represents just a small fraction of the total energy output of our Sun, but “in massive stars, this is the...
  • Earth Is a Whole Lot Closer to Our Galaxy's Supermassive Black Hole Than We Thought

    11/27/2020 10:36:44 PM PST · by LibWhacker · 43 replies
    Science Alert ^ | 11/27/2020 | Michelle Starr
    Earth Is a Whole Lot Closer to Our Galaxy's Supermassive Black Hole Than We Thought MICHELLE STARR 27 NOVEMBER 2020 It seems that Earth has been misplaced. According to a new map of the Milky Way galaxy, the Solar System's position isn't where we thought it was. Not only is it closer to the galactic centre - and the supermassive hole therein, Sagittarius A* - it's orbiting at a faster clip. It's nothing to be concerned about; we're not actually moving closer to Sgr A*, and we're in no danger of being slurped up. Rather, our map of the Milky...
  • Something's Making Dead Stars Mysteriously Hot, And We're Running Out of Explanations

    11/25/2020 8:05:03 AM PST · by Red Badger · 56 replies
    https://www.sciencealert.com ^ | 24 NOVEMBER 2020 | MICHELLE STARR
    White dwarf stars in globular cluster NGC 6397. (NASA, ESA, and H. Richer/University of British Columbia) SPACE ====================================================================== When stars like the Sun reach the end of their lives, the object that remains is a white dwarf. This is the star's shrunken, naked core, no longer capable of nuclear fusion. It shines, but only with residual heat, slowly cooling over billions of years until it's completely cold and dark. But not all white dwarfs cool the same way. Last year, astronomers found a certain type of massive white dwarf stars cool more slowly than others, as though they have...
  • Astronomy Picture of the Day - A Glowing STEVE and the Milky Way

    11/17/2020 3:17:02 PM PST · by MtnClimber · 24 replies
    APOD.NASA.gov ^ | 17 Nov, 2020 | Image Credit: NASA, Krista Trinder
    Explanation: What's creating these long glowing streaks in the sky? No one is sure. Known as Strong Thermal Emission Velocity Enhancements (STEVEs), these luminous light-purple sky ribbons may resemble regular auroras, but recent research reveals significant differences. A STEVE's great length and unusual colors, when measured precisely, indicate that it may be related to a subauroral ion drift (SAID), a supersonic river of hot atmospheric ions thought previously to be invisible. Some STEVEs are now also thought to be accompanied by green picket fence structures, a series of sky slats that can appear outside of the main auroral oval that...
  • Brown Dwarf Discovered by Radio Telescope Observations for the First Time

    11/13/2020 8:57:23 AM PST · by Red Badger · 13 replies
    scitechdaily.com ^ | November 13, 2020 | By Association of Universities for Research in Astronomy (AURA)
    Artist’s impression of the cold brown dwarf BDR J1750+3809. The blue loops depict the magnetic field lines. Charged particles moving along these lines emit radio waves that LOFAR detected. Some particles eventually reach the poles and generate aurorae similar to the northern lights on Earth. Credit: ASTRON/Danielle Futselaar ========================================================================== Gemini North and IRTF Confirm LOFAR Discovery For the first time, astronomers have used observations from the LOFAR radio telescope, the NASA IRTF, operated by the University of Hawai‘i, and the international Gemini Observatory, a Program of NSF’s NOIRLab, to discover and characterize a cold brown dwarf. The object, designated BDR...
  • Seeing dark matter in a new light

    11/06/2020 6:35:58 AM PST · by Red Badger · 5 replies
    https://phys.org ^ | November 6, 2020 | by Morgan Hollis, Royal Astronomical Society
    Artist's impression of a galaxy surrounded by gravitational distortions due to dark matter. Galaxies live inside larger concentrations of invisible dark matter (coloured purple in this image), however the dark matter's effects can be seen by looking at the deformations of background galaxies. Credit: Swinburne Astronomy Productions - James Josephides ========================================================================== A small team of astronomers have found a new way to 'see' the elusive dark matter haloes that surround galaxies, with a new technique 10 times more precise than the previous-best method. The work is published in Monthly Notices of the Royal Astronomical Society. Scientists currently estimate that up...
  • Boosting the capacity of supercapacitors

    11/02/2020 9:00:30 AM PST · by Red Badger · 21 replies
    Techxplore.com ^ | November 2, 2020 | by King Abdullah University of Science and Technology
    Schematic depiction of the asymmetric supercapacitor with the porous COF as the negative electrode shown on the left. Credit: KAUST, Osama Shekhah ========================================================================= Carefully designed covalent organic frameworks could make supercapacitor electrodes that have a greater ability to store electric charge. A porous organic material created at KAUST could significantly improve energy storage and delivery by supercapacitors, which are devices that are able to deliver quick and powerful bursts of energy. Supercapacitors use technology that is significantly different from the reversible chemical reactions used in rechargeable batteries. They store electrical energy by building up a separation of positive and electric...
  • The Most Famous Paradox in Physics Nears Its End

    10/30/2020 3:38:08 AM PDT · by Candor7 · 37 replies
    Quanta Magazine ^ | 29 October 2020 | George Musser
    ......................................And that led to a remarkable twist in the story. Because the radiation is highly entangled with the black hole it came from, the quantum computer, too, becomes highly entangled with the hole. Within the simulation, the entanglement translates into a geometric link between the simulated black hole and the original. Put simply, the two are connected by a wormhole. “There’s the physical black hole and then there’s the simulated one in the quantum computer, and there can be a replica wormhole connecting those,” said Douglas Stanford, a theoretical physicist at Stanford and a member of the West Coast team....
  • Extreme 'Black Widow' Star Identified as Source of Mystery Gamma Radiation

    10/27/2020 2:11:13 PM PDT · by MtnClimber · 16 replies
    Science Alert ^ | 27 Oct, 2020 | MICHELLE STARR
    For more than two decades, astronomers have been systematically tracing mystery sources of high-energy gamma rays to their sources. One, however, remained stubborn - the brightest unidentified source of gamma rays in the Milky Way. It seemed to be coming from a binary system 2,740 light-years away, but only one of the stars could be found. Now, astronomers have solved the mystery and pinned down that second star by searching gamma-ray data obtained between 2008 and 2018. Together, the two stars constitute one of the weirdest binary systems we've ever seen. "The binary star system and the neutron star at...
  • There’s a new record for the shortest time measurement: how long it takes light to cross a hydrogen molecule

    10/26/2020 10:27:51 PM PDT · by LibWhacker · 59 replies
    Universe Today ^ | 10/26/2020 | Paul M. Sutter
    To measure small differences in time, you need a really tiny clock, and researchers in Germany have discovered the smallest known clock: a single hydrogen molecule. Using the travel of light across the length of that molecule, those scientists have measured the smallest interval of time ever: 247 zeptoseconds. Don’t know what a “zepto” is? Read on… When a bit of light, called a photon, hits an atom with enough energy, it can kick the electron out of that atom and send it flying. When we carefully set up this situation in a laboratory, we can measure the electron shooting...
  • Astronomy Picture of the Day - Dark Matter in a Simulated Universe

    10/25/2020 2:32:54 PM PDT · by MtnClimber · 10 replies
    APOD.NASA.gov ^ | 25 Oct, 2020 | Illustration Credit & Copyright: Tom Abel & Ralf Kaehler (KIPAC, SLAC), AMNH
    Explanation: Is our universe haunted? It might look that way on this dark matter map. The gravity of unseen dark matter is the leading explanation for why galaxies rotate so fast, why galaxies orbit clusters so fast, why gravitational lenses so strongly deflect light, and why visible matter is distributed as it is both in the local universe and on the cosmic microwave background. The featured image from the American Museum of Natural History's Hayden Planetarium previous Space Show Dark Universe highlights one example of how pervasive dark matter might haunt our universe. In this frame from a detailed computer...
  • Timekeeping theory combines quantum clocks and Einstein's relativity

    10/23/2020 10:14:00 AM PDT · by BenLurkin · 34 replies
    Phys.org ^ | 10/23/2020 | Dartmouth College
    A phenomenon of quantum mechanics known as superposition can impact timekeeping in high-precision clocks, according to a theoretical study from Dartmouth College, Saint Anselm College and Santa Clara University. Research describing the effect shows that superposition—the ability of an atom to exist in more than one state at the same time—leads to a correction in atomic clocks known as "quantum time dilation." The research, published in the journal Nature Communications, takes into account quantum effects beyond Albert Einstein's theory of relativity to make a new prediction about the nature of time. In the early 1900s, Albert Einstein presented a revolutionary...
  • CERN: WE ARE CONFIDENT OF MAKING CONTACT WITH A PARALLEL UNIVERSE THIS WEEK… OUT OF THIS DOOR MIGHT COME “SOMETHING”

    10/20/2020 6:31:55 PM PDT · by Roman_War_Criminal · 130 replies
    skywatchtv ^ | 10/18/20 | SW Editor
    As pointed out by Dr. Thomas Horn and “Into the Multiverse” host Josh Peck in the internationally-acclaimed books On The Path Of The Immortals (FREE IN OFFER HERE) and Abaddon Ascending, when the Large Hadron Collider (LHC) first started up on September 10, 2008, director for research and scientific computing at CERN, Sergio Bertolucci, provoked a whirlwind of speculation with his enigmatic remark that the LHC might open a door to another dimension. During a regular briefing at CERN headquarters, he told reporters, “Out of this door might come something, or we might send something through it.”[i] The notion of...
  • Researchers At Large Hadron Collider Are Confident To Make Contact With Parallel Universe In Days

    10/17/2020 5:22:43 PM PDT · by Roman_War_Criminal · 168 replies
    sciencenatures ^ | 10/10/20 | staff
    The astoundingly complex LHC “atom smasher” at the CERN center in Geneva, Switzerland, are fired up to its maximum energy levels ever in an endeavor to identify - or perhaps generate - tiny black holes. If successful a very new universe is going to be exposed – modifying completely not only the physics books but the philosophy books too. It is even probable that gravity from our own universe may “transfer” into this parallel universe, researchers at the LHC say. The experiment is assured to accentuate alarmist critics of the LHC, many of whom initially warned the high energy particle...
  • Betelgeuse Is Neither as Far Nor as Large as We Thought, And It's a Total Bummer

    10/16/2020 8:42:10 AM PDT · by Red Badger · 55 replies
    www.sciencealert.com ^ | MIKE MCRAE 16 OCTOBER 2020
    (ALMA - ESO/NAOJ/NRAO, E/O'Gorman/P.Kervella) ========================================================================= In the wake of recent fluctuations in Betelgeuse's brightness, astronomers have rigorously examined the star's vital statistics, and come up with a bit of a surprise. According to the team led by researchers at Australian National University (ANU), the results change a few important things about our favourite red giant. "The actual physical size of Betelgeuse has been a bit of a mystery – earlier studies suggested it could be bigger than the orbit of Jupiter," says astronomer László Molnár from the Konkoly Observatory in Hungary. "Our results say Betelgeuse only extends out to two...
  • NASA Claims Cold Fusion Without Naming It

    10/14/2020 10:30:06 AM PDT · by Red Badger · 27 replies
    hackaday.com ^ | September 28, 2020 | by: Al Williams
    Do you remember in 1989 when two chemists announced they’d created a setup that created nuclear fusion at room temperature? Everyone was excited, but it eventually turned out to be very suspect. It wasn’t clear how they detected that fusion occurred and only a few of the many people who tried to replicate the experiment claimed success and they later retracted their reports. Since then, mentioning cold fusion is right up there with perpetual motion. Work does continue though, and NASA recently published several papers on lattice confinement fusion which is definitely not called cold fusion, although it sounds like...
  • For The First Time, Physicists Have Achieved Superconductivity at Room Temperature

    10/14/2020 9:25:50 AM PDT · by Red Badger · 80 replies
    www.sciencealert.com ^ | 14 OCTOBER 2020 | MICHELLE STARR
    A major new milestone has just been achieved in the quest for superconductivity. For the first time, physicists have achieved the resistance-free flow of an electrical current at room temperature - a positively balmy 15 degrees Celsius (59 degrees Fahrenheit). This has smashed the previous record of -23 degrees Celsius (-9.4 degrees Fahrenheit), and has brought the prospect of functional superconductivity a huge step forward. "Because of the limits of low temperature, materials with such extraordinary properties have not quite transformed the world in the way that many might have imagined," physicist Ranga Dias of the University of Rochester said...