beecee Posted July 16, 2018 Posted July 16, 2018 https://phys.org/news/2018-07-einstein-date-lorentz-violation-high-energy.html New study again proves Einstein right: Most thorough test to date finds no Lorentz violation in high-energy neutrinos July 16, 2018 by Jennifer Chu, Massachusetts Institute of Technology The universe should be a predictably symmetrical place, according to a cornerstone of Einstein's theory of special relativity, known as Lorentz symmetry. This principle states that any scientist should observe the same laws of physics, in any direction, and regardless of one's frame of reference, as long as that object is moving at a constant speed. For instance, as a consequence of Lorentz symmetry, you should observe the same speed of light—300 million meters per second—whether you are an astronaut traveling through space or a molecule moving through the bloodstream. But for infinitesimally small objects that operate at incredibly high energies, and over vast, universe-spanning distances, the same rules of physics may not apply. At these extreme scales, there may exist a violation to Lorentz symmetry, or Lorentz violation, in which a mysterious, unknown field warps the behavior of these objects in a way that Einstein would not predict. The hunt has been on to find evidence of Lorentz violation in various phenomena, from photons to gravity, with no definitive results. Physicists believe that if Lorentz violation exists, it might also be seen in neutrinos, the lightest known particles in the universe, which can travel over vast distances and are produced by cataclysmic high-energy astrophysical phenomena. Any confirmation that Lorentz violation exists would point to completely new physics that cannot be explained by Einstein's theory. Now MIT scientists and their colleagues on the IceCube Experiment have led the most thorough search yet of Lorentz violation in neutrinos. They analyzed two years of data collected by the IceCube Neutrino Observatory, a massive neutrino detector buried in the Antarctice ice. The team searched for variations in the normal oscillation of neutrinos that could be caused by a Lorentz-violating field. According to their analysis, no such abnormalities were observed in the data, which comprises the highest-energy atmospheric neutrinos that any experiment has collected. Read more at: https://phys.org/news/2018-07-einstein-date-lorentz-violation-high-energy.html#jCp >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>><<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<< the paper: https://www.nature.com/articles/s41567-018-0172-2 Abstract: Lorentz symmetry is a fundamental spacetime symmetry underlying both the standard model of particle physics and general relativity. This symmetry guarantees that physical phenomena are observed to be the same by all inertial observers. However, unified theories, such as string theory, allow for violation of this symmetry by inducing new spacetime structure at the quantum gravity scale. Thus, the discovery of Lorentz symmetry violation could be the first hint of these theories in nature. Here we report the results of the most precise test of spacetime symmetry in the neutrino sector to date. We use high-energy atmospheric neutrinos observed at the IceCube Neutrino Observatory to search for anomalous neutrino oscillations as signals of Lorentz violation. We find no evidence for such phenomena. This allows us to constrain the size of the dimension-four operator in the standard-model extension for Lorentz violation to the 1 0 - 28 level and to set limits on higher-dimensional operators in this framework. These are among the most stringent limits on Lorentz violation set by any physical experiment.
Taingorz Posted August 3, 2018 Posted August 3, 2018 What I don't understand is that people belive so blindly once it is in a 'paper' There is sooo much wrong with the relativity theories of einstein. He was a rather stupid man, his wife did the math for him! man o man. -1
StringJunky Posted August 3, 2018 Posted August 3, 2018 13 minutes ago, Taingorz said: What I don't understand is that people belive so blindly once it is in a 'paper' There is sooo much wrong with the relativity theories of einstein. He was a rather stupid man, his wife did the math for him! man o man. "You can fool some people... " 113 years is rather a long time to fool them.
jimmydasaint Posted August 4, 2018 Posted August 4, 2018 beecee, superb find which, IIRC, support the Classical Model. What are likely to be the fields of enquiry (no pun intended) for string theorists in the future?
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