Researcher uses math to investigate possibility of time travel
Apr 27, 2017
After some serious number crunching, a UBC researcher has come up with a mathematical model for a viable time machine.
Jupiter and the theory of relativity blamed for course changes of celestial bodies
Apr 27, 2017
In the case of solar system bodies passing close to the sun, there are two important effects playing a crucial role in the orbital evolution. One of the effects is from the general relativity and the other effect is from ...
Explaining the accelerating expansion of the universe without dark energy
Mar 30, 2017
Enigmatic 'dark energy', thought to make up 68% of the universe, may not exist at all, according to a Hungarian-American team. The researchers believe that standard models of the universe fail to take account of its changing ...
'Blurred times' in a quantum world
Mar 09, 2017
When measuring time, we normally assume that clocks do not affect space and time, and that time can be measured with infinite accuracy at nearby points in space. However, combining quantum mechanics and Einstein's theory ...
Violations of energy conservation in the early universe may explain dark energy
Jan 20, 2017 feature
(Phys.org)—Physicists have proposed that violations of energy conservation in the early universe, as predicted by certain modified theories of quantum mechanics and quantum gravity, may explain the cosmological constant ...
Cryogenic test probes Einstein's equivalence principle, general relativity, and spacetime 'foam'
Jan 05, 2017 feature
(Phys.org)—Physicists have performed a test designed to investigate the effects of the expansion of the universe—hoping to answer questions such as "does the expansion of the universe affect laboratory experiments?", ...
Still no violation of Lorentz symmetry, despite strongest test yet
Dec 23, 2016 feature
(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 ...
Much ado about nothing: Astronomers use empty space to study the universe
Aug 11, 2016
Researchers who are looking for new ways to probe the nature of gravity and dark energy in the universe have adopted a new strategy: looking at what's not there.
Black hole makes material wobble around it
Jul 12, 2016
The European Space Agency's orbiting X-ray observatory, XMM-Newton, has proved the existence of a "gravitational vortex" around a black hole. The discovery, aided by NASA's Nuclear Spectroscopic Telescope Array (NuSTAR) mission, ...
Gravitational physics poised for new era of discovery
Jun 28, 2016
The recent detection of gravitational waves from the collision of two black holes signals a new era in gravitational wave astrophysics that will allow probing of the Universe in never before known ways, writes a Montana State ...