Accelerating light beams in curved space
Jan 12, 2018 feature
By shining a laser along the inside shell of an incandescent light bulb, physicists have performed the first experimental demonstration of an accelerating light beam in curved space. Rather than moving along a geodesic trajectory ...
Doing without dark energy: Mathematicians propose alternative explanation for cosmic acceleration
Dec 14, 2017
Three mathematicians have a different explanation for the accelerating expansion of the universe that does without theories of "dark energy." Einstein's original equations for General Relativity actually predict cosmic acceleration ...
Galileo's free-falling objects experiment passes space test further proving equivalence principle
Dec 05, 2017 report
A team of researchers from the French Aerospace Lab and at the Côte d'Azur Observatory working on France's MICROSCOPE satellite project has further confirmed the equivalence principle by recreating Galileo's free-falling ...
Fifty years ago, Jocelyn Bell discovered pulsars and changed our view of the universe
Nov 28, 2017
A pulsar is a small, spinning star – a giant ball of neutrons, left behind after a normal star has died in a fiery explosion.
Physicist explores the possibility of vestiges of a universe previous to the Big Bang
Nov 28, 2017
The Big Bang theory is the best known and most accepted explanation for the beginning and evolution of the universe, but it is hardly a consensus among scientists.
Do dark matter and dark energy exist?
Nov 22, 2017
Researchers have hypothesized that the universe contains "dark matter." They have also posited the existence of "dark energy." These two hypotheses account for the movement of stars in galaxies and for the accelerating expansion ...
New quantum materials offer novel route to 3-D electronic devices
Nov 07, 2017
Researchers have shown how the principles of general relativity open the door to novel electronic applications such as a three-dimensional electron lens and electronic invisibility devices. In a new study funded by the Academy ...
Physicists make rapid progress in bounding the speed of gravity
Nov 01, 2017 feature
(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 ...
Expertise in sciences and the decision of what is publishable
Oct 30, 2017
When Einstein discovered the peer-review process…
Russian scientists find flaws in popular theories of gravity
Oct 27, 2017
Using a model of black holes, scientists from the Ural Federal university (UrFU, Yekaterinburg) determined that a popular theory of gravity that seemed to work perfectly at the cosmological level (a subclass of Horndeski ...