Highly accurate quantum accelerometers - 5 views
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Their accuracy is orders of magnitude better than what is currently being used, however at the moment, it sounds like quite a large setup -> they're working on getting it down to 1m^3 :o, still any gravity mapping instruments could benefit from these in the future.
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Actually GPS is much more accurate, but as it doesnt work under water, the only alternative (without building an underwater GPS equivalent using probes) is to use cumulative accelerometer data. But as this is prone to drifting over time, quantum systems like this can help improving the accuracy significantly.
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Very true :). I was thinking though when you want to remove 'noise' from any gravity mapping experiment, highly accurate accelerometers are required, like those used in GOCE.
Small, cheap gravity gadget to peer underground - BBC News - 2 views
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According to their Nature article, they can detect "a tunnel less than 1m across, buried 2m underground" just from its gravitational difference. Using a device that they predict could cost ~100 € in mass production. UK researchers have built a small device that measures tiny fluctuations in gravity, and could be used to monitor volcanoes or search for oil. Such gravimeters already exist but compared to this postage stamp-sized gadget, they are bulky and pricy.
A precise extragalactic test of General Relativity - 0 views
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Einstein's theory of gravity, General Relativity (GR), has been tested precisely within the Solar System. However, it has been difficult to test GR on the scale of an individual galaxy. Collett et al. exploited a nearby gravitational lens system, in which light from a distant galaxy (the source) is bent by a foreground galaxy (the lens). Mass distribution in the lens was compared with the curvature of space-time around the lens, independently determined from the distorted image of the source. The result supports GR and eliminates some alternative theories of gravity.
Robot Spheres in zero-gravity action / Education / Human Spaceflight / Our Activities /... - 3 views
Particles defy gravity and float upstream - 3 views
The Higgs, Boltzmann Brains, and Monkeys Typing Hamlet | The Crux | Discover Magazine - 7 views
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good luck with this....
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In 1996 Sokal hoaxed sociologists with his famous nonsense text on political implications of quantum gravity. Can one play a similar game with "researchers" on Boltzmann brains, multiverses, string landscapes or similar? I doubt, this is just reality satire that can't be topped.
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Poor Boltzmann ...
Robot quadcopters could help scientists perform zero g experiments without the cost of ... - 1 views
Proof of the Riemann Hypothesis utilizing the theory of Alternative Facts - 0 views
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An excellent science coffee topic! This is a true breakthrough in pure mathematics with plentiful applications in the lesser sciences (such as theoretical physics). People tell me quantum gravity is already practically solved by this. Conway's powerful theory of Alternative Facts can render many difficult problems tractable. Here we demonstrate the power of AF to prove the Riemann Hypothesis, one of the most important unsolved problems in mathematics. We further suggest applications of AF to other challenging unsolved problems such as the zero-equals-one conjecture (which is also true) and the side-counting problem of the circle.
New method uses heat flow to levitate variety of objects - 1 views
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Normally we associate levitation of objects to superconducting materials. Here a new technique is shown where levitation of a whole new range of materials is shown. "The large temperature gradient leads to a force that balances gravity and results in stable levitation," said Fung, the study's lead author. "We managed to quantify the thermophoretic force and found reasonable agreement with what is predicted by theory. This will allow us to explore the possibilities of levitating different types of objects." Paper at http://aip.scitation.org/doi/10.1063/1.4974489 New microgravity experiments possibility?
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not really I fear .... "Typical sizes of the trapped particles are between 10 μm and 1 mm at a pressure between 1 and 10 Torr. The trapping stability is provided radially by the increasing temperature field and vertically by the transition from the free molecule to hydrodynamic behavior of thermophoresis as the particles ascend."
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Might still be OK micro to mm sized experiments. The technique seems to be reliable and cheap enough to compete with other types of microgravity approaches - more research needed to define boundaries of course.
GTOC problem announced! - 0 views
"This year's problem is the global mapping of Jupiter's Galilean satellites, Io, Europa, Ganymede, and Callisto, by means of close flybys. A trajectory must be designed for a low-thrust spacecraft ...
Analog cosmology with spinor BECs - 2 views
Computer simulations of muscle-based biped locomotion (movie) - 3 views
Bacterial growth in space - 0 views
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