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Keyword: loopquantumgravity

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  • The Most Powerful Gamma Ray Burst Just Corroborated General Relativity Once Again

    07/10/2020 12:12:41 PM PDT · by Red Badger · 8 replies ^ | 10 JULY 2020 | MICHELLE STARR
    Last year, scientists detected the most energetic gamma ray burst we've ever seen. A distant galaxy spat out a colossal flare in the range of a trillion electron volts (TeV), providing invaluable new insight into the physics of these incredibly energetic events. That was pretty amazing on its own - but now astrophysicists have used the burst to perform a new, precise test of the theory of general relativity. And - quelle surprise! - this test found that the speed of light is constant in a vacuum. Relativity, once again, has passed with flying colours. The test hinges on a...
  • Physicists propose test for loop quantum gravity

    04/07/2013 12:16:44 PM PDT · by SunkenCiv · 16 replies
    PhysOrg ^ | January 3, 2012 | Lisa Zyga
    As a quantum theory of gravity, loop quantum gravity could potentially solve one of the biggest problems in physics: reconciling general relativity and quantum mechanics. But like all tentative theories of quantum gravity, loop quantum gravity has never been experimentally tested. Now in a new study, scientists have found that, when black holes evaporate, the radiation they emit could potentially reveal “footprints” of loop quantum gravity, distinct from the usual Hawking radiation that black holes are expected to emit. In this way, evaporating black holes could enable the first ever experimental test for any theory of quantum gravity. However, the...
  • Competing theories of the cosmos [sidebar]

    11/26/2006 9:01:18 AM PST · by SunkenCiv · 13 replies · 419+ views
    Toronto Star ^ | Sunday, November 26, 2006 | Dan Falk
    According to string theory, the universe is composed of tiny, vibrating strings rather than point-like particles. Depending on a particular string's mode of vibration, it would take on the characteristics of some particular particle -- an electron, for example, or a photon of light... In its latest incarnation it is known as "M-Theory," in which one-dimensional strings are replaced by higher-dimensional membranes, or "branes" for short. Although some of these branes may be microscopic, others could be large, or perhaps even infinite -- with important implications for cosmology... While string theory begins with matter, loop quantum gravity begins with space...
  • Large Hadron Collider: Does every particle in the universe consist of points, strings, or loops?

    01/18/2007 1:15:35 AM PST · by SunkenCiv · 16 replies · 369+ views
    iTWire ^ | Thursday, January 18, 2007 | William Atkins
    String theorists state that electrons, photons, protons, and all other particles are not zero-dimensional point-like objects (which form the basis of the Standard Model) but rather tiny one-dimensional extended objects that behave like strings. A group of strings vibrate at a specific resonant frequency -- similar to the movement of strings to produce different sounds on musical instruments such as the violin and guitar -- depending on what type of particle they are, such as electron, photon, proton, and so forth. Over the years, string theorists have not generated any experimental data based on fundamental physical law that proves or...