News tagged with quantum gravity
Repulsive gravity as an alternative to dark energy (Part 2: In the quantum vacuum)
(PhysOrg.com) -- During the past few years, CERN physicist Dragan Hajdukovic has been investigating what he thinks may be a widely overlooked part of the cosmos: the quantum vacuum. He suggests that the quantum vacuum has ...
Feb 01, 2012 |
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Physicists propose test for loop quantum gravity
(PhysOrg.com) -- As a quantum theory of gravity, loop quantum gravity could potentially solve one of the biggest problems in physics: reconciling general relativity and quantum mechanics. But like all tentative ...
Jan 03, 2012 |
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Four reasons why the quantum vacuum may explain dark matter
(PhysOrg.com) -- Earlier this year, PhysOrg reported on a new idea that suggested that gravitational charges in the quantum vacuum could provide an alternative to dark matter. The idea rests on the hypothesis that particles ...
Nov 28, 2011 |
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One clock with two times: When quantum mechanics meets general relativity
The unification of quantum mechanics and Einstein's general relativity is one of the most exciting and still open questions in modern physics. General relativity, the joint theory of gravity, space and time ...
Oct 19, 2011 |
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Escaping gravity's clutches: The black hole breakout
New research by scientists at the University of York gives a fresh perspective on the physics of black holes.
Aug 11, 2011 |
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Probing the laws of gravity: A gravity resonance method
Quantum mechanical methods can now be used to study gravity: At the Vienna University of Technology (TU Vienna), a measurement method was developed, which allows to test the fundamental theories of physics.
Apr 18, 2011 |
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Physicists investigate fate of five-dimensional black strings
(PhysOrg.com) -- While black holes in four-dimensional space-time are stable and can persist for a long time, their higher-dimensional analogues are usually unstable. One such theoretical analogue is a five-dimensional ...
Sep 10, 2010 |
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Physicists develop model that pushes limits of quantum theory, relativity
All of the matter in the universe -- everything we see, feel and smell -- has a certain predictable structure, thanks to the tiny electrons spinning around their atomic nuclei in a series of concentric shells or atomic levels. ...
Aug 03, 2010 |
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Time travel theory avoids grandfather paradox
(PhysOrg.com) -- The possibility of going back in time only to kill your ancestors and prevent your own birth has posed a serious problem for potential time travelers, not even considering the technical details ...
Jul 21, 2010 |
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Revised theory of gravity doesn't predict a Big Bang
(PhysOrg.com) -- The Big Bang theory has formed the basis of our understanding of the universe's origins since it was first proposed in 1927 by Georges Lemaitre. And for good reason: the theory is supported ...
Jul 12, 2010 |
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Planck Mission: Space Probe Peers Into Dark Cosmos
(PhysOrg.com) -- Imagine watching the birth of the universe -- the Big Bang -- from the outside. What would you have seen?
Jun 10, 2010 |
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Gravity might amplify quantum fluctuations, create astrophysical objects
(PhysOrg.com) -- In a new study, physicists have proposed that gravity could trigger a runaway effect in quantum fluctuations, causing them to grow so large that the quantum field’s vacuum energy density could dominate its ...
May 17, 2010 |
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Einstein equations indicate possibility of black hole formation at the LHC
(PhysOrg.com) -- One of the concerns that has been voiced about the Large Hadron Collider (LHC), is that it could result in the formation of black holes that could destroy the world. While most scientists ...
Apr 06, 2010 |
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Quantum Sensor Developed by LSU Researcher Breaks New Limits
(PhysOrg.com) -- Researchers at Louisiana State University have invented an optical sensor that surpasses a quantum limit to sensitivity previously believed to be unbeatable. The breakthrough has a broad array of applications, ...
Mar 16, 2010 |
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Proposed Spacetime Structure Could Provide Hints for Quantum Gravity Theory
(PhysOrg.com) -- Spacetime, which consists of three dimensions of space and one time dimension, is such a large, abstract concept that scientists have a very difficult time understanding and defining it. Moreover, ...
Dec 16, 2009 |
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