Friction in the vacuum?
(Phys.org)—When three physicists first discovered through their calculations that a decaying atom moving through the vacuum experiences a friction-like force, they were highly suspicious. The results seemed to go against ...
Page 8 - News tagged with relativity
Losing their tails provided our ape ancestors with an evolutionary advantage, but we're still paying the price
Put the word "evolution" into Google images and the results are largely variations on one theme: Ralph Zallinger's illustration, March of Progress. Running left to right, we see a chimp-like knuckle walker gradually becoming ...
Evolution
Mar 3, 2024
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Three time dimensions, one space dimension: Relativity of superluminal observers in 1+3 spacetime
How would our world be viewed by observers moving faster than light in a vacuum? Such a picture would be clearly different from what we encounter every day. "We should expect to see not only phenomena that happen spontaneously, ...
General Physics
Dec 22, 2022
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Time travel could be possible, but only with parallel timelines
Have you ever made a mistake that you wish you could undo? Correcting past mistakes is one of the reasons we find the concept of time travel so fascinating. As often portrayed in science fiction, with a time machine, nothing ...
General Physics
Apr 25, 2022
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Why Einstein must be wrong: In search of the theory of gravity
Einstein's theory of gravity—general relativity—has been very successful for more than a century. However, it has theoretical shortcomings. This is not surprising: the theory predicts its own failure at spacetime singularities ...
General Physics
Sep 25, 2023
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New work gives credence to theory of universe as a hologram
(Phys.org) —In publishing a story regarding work reported by Japanese physicists last month, Nature News has set off a bit of a tabloid firestorm by describing an obscure bit of physics theory as "the clearest evidence ...
New math bridges holography and twistor theory
The modern-day theoretical physicist faces a taxing uphill climb. "As we learn more, reality becomes ever more subtle; the absolute becomes relative, the fixed becomes dynamical, the definite is laden with uncertainty," writes ...
Quantum Physics
Mar 30, 2018
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Still no violation of Lorentz symmetry, despite strongest test yet
(Phys.org)—Physicists have found the strongest evidence yet for no violation of Lorentz symmetry, one of the fundamental symmetries of relativity. Lorentz symmetry states that the outcome of an experiment does not depend ...
Physicists make rapid progress in bounding the speed of gravity
(Phys.org)—Recent gravitational wave detections have allowed physicists to confirm with greater and greater precision what Einstein predicted over 100 years ago in the theory of general relativity: that gravity does not ...
New principle may help explain why nature is quantum
Like small children, scientists are always asking the question 'why?'. One question they've yet to answer is why nature picked quantum physics, in all its weird glory, as a sensible way to behave. Researchers Corsin Pfister ...
Quantum Physics
May 14, 2013
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