Artificial spacetime experiment could show tantalizing effects of gravitational waves
Physicists describe method to observe timelike entanglement
Mathematicians offer unified theory of dark matter, dark energy, altering Einstein field equations
(Phys.org)—A pair of mathematicians—one from Indiana University and the other from Sichuan University in China—have proposed a unified theory of dark matter and dark energy that alters Einstein's equations ...
Fine-tuning Stephen Hawking's theory of mass
(Phys.org) —If you want to know your body's mass, you hop on a scale and watch the needle swing. But if you want to know the mass of a region out in space, there's no cosmic equivalent—the best you can ...
Model describes universe with no big bang, no beginning, and no end
Scientists investigate the possibility of wormholes between stars
Liquid spacetime: A very slippery superfluid, that's what spacetime could be like
What if spacetime were a kind of fluid? This is the question tackled by theoretical physicists working on quantum gravity by creating models attempting to reconcile gravity and quantum mechanics. Some of ...
Spacetime ripples from dying black holes could help reveal how they formed
(Phys.org)—Researchers from Cardiff University have discovered a new property of black holes: their dying tones could reveal the cosmic crash that produced them.
Expanding universe can emerge in remarkably simple way, scientists say
When soup is heated, it starts to boil. When time and space are heated, an expanding universe can emerge, without requiring anything like a "Big Bang". This phase transition between a boring empty space and ...
Gravitational telescope creates space invader mirage
(Phys.org)—The NASA/ESA Hubble Space Telescope is one of the most powerful available to astronomers, but sometimes it too needs a helping hand. This comes in the form of Einstein's general theory of relativity, ...
Spacetime: A smoother brew than we knew
(Phys.org)—Spacetime may be less like beer and more like sipping whisky.
Shape from sound: New methods to probe the universe
(Phys.org) —As the universe expands, it is continually subjected to energy shifts, or "quantum fluctuations," that send out little pulses of "sound" into the fabric of spacetime. In fact, the universe is thought to have ...
A Newtonian system that mimics the baldness of rotating black holes
(PhysOrg.com) -- The rotating black hole has been described as one of nature's most perfect objects. As described by the Kerr solution of Einstein's gravitational field equations, its spacetime geometry is ...
Does time pass? New book says it does—but not in the way you may think
"If you walk into a cocktail party and say, 'I don't believe that time passes,' everyone's going to think you're completely insane," says Brad Skow, an associate professor of philosophy at MIT.