Jun 19, 2017 06:44 PM
Physicists Demonstrate Record Breaking Long-Distance Quantum Entanglement in Space
https://futurism.com/physicists-demonstr...-in-space/
EXCERPT: Chinese physicists managed to demonstrate long-distance quantum entanglement in space, breaking previous records. This development, made possible by a novel method, could lead to improved information storage and transfer in the future....
Dark Matter Recipe Calls for One Part Superfluid
https://www.quantamagazine.org/dark-matt...-20170613/
EXCERPT: A different kind of dark matter could help to resolve an old celestial conundrum. For years, dark matter has been behaving badly. The term was first invoked nearly 80 years ago by the astronomer Fritz Zwicky, who realized that some unseen gravitational force was needed to stop individual galaxies from escaping giant galaxy clusters. Later, Vera Rubin and Kent Ford used unseen dark matter to explain why galaxies themselves don’t fly apart.
Yet even though we use the term “dark matter” to describe these two situations, it’s not clear that the same kind of stuff is at work. The simplest and most popular model holds that dark matter is made of weakly interacting particles that move about slowly under the force of gravity. This so-called “cold” dark matter accurately describes large-scale structures like galaxy clusters. However, it doesn’t do a great job at predicting the rotation curves of individual galaxies. Dark matter seems to act differently at this scale.
In the latest effort to resolve this conundrum, two physicists have proposed that dark matter is capable of changing phases at different size scales. Justin Khoury, a physicist at the University of Pennsylvania, and his former postdoc Lasha Berezhiani, who is now at Princeton University, say that in the cold, dense environment of the galactic halo, dark matter condenses into a superfluid — an exotic quantum state of matter that has zero viscosity. If dark matter forms a superfluid at the galactic scale, it could give rise to a new force that would account for the observations that don’t fit the cold dark matter model. Yet at the scale of galaxy clusters, the special conditions required for a superfluid state to form don’t exist; here, dark matter behaves like conventional cold dark matter....
MORE: https://www.quantamagazine.org/dark-matt...-20170613/
https://futurism.com/physicists-demonstr...-in-space/
EXCERPT: Chinese physicists managed to demonstrate long-distance quantum entanglement in space, breaking previous records. This development, made possible by a novel method, could lead to improved information storage and transfer in the future....
Dark Matter Recipe Calls for One Part Superfluid
https://www.quantamagazine.org/dark-matt...-20170613/
EXCERPT: A different kind of dark matter could help to resolve an old celestial conundrum. For years, dark matter has been behaving badly. The term was first invoked nearly 80 years ago by the astronomer Fritz Zwicky, who realized that some unseen gravitational force was needed to stop individual galaxies from escaping giant galaxy clusters. Later, Vera Rubin and Kent Ford used unseen dark matter to explain why galaxies themselves don’t fly apart.
Yet even though we use the term “dark matter” to describe these two situations, it’s not clear that the same kind of stuff is at work. The simplest and most popular model holds that dark matter is made of weakly interacting particles that move about slowly under the force of gravity. This so-called “cold” dark matter accurately describes large-scale structures like galaxy clusters. However, it doesn’t do a great job at predicting the rotation curves of individual galaxies. Dark matter seems to act differently at this scale.
In the latest effort to resolve this conundrum, two physicists have proposed that dark matter is capable of changing phases at different size scales. Justin Khoury, a physicist at the University of Pennsylvania, and his former postdoc Lasha Berezhiani, who is now at Princeton University, say that in the cold, dense environment of the galactic halo, dark matter condenses into a superfluid — an exotic quantum state of matter that has zero viscosity. If dark matter forms a superfluid at the galactic scale, it could give rise to a new force that would account for the observations that don’t fit the cold dark matter model. Yet at the scale of galaxy clusters, the special conditions required for a superfluid state to form don’t exist; here, dark matter behaves like conventional cold dark matter....
MORE: https://www.quantamagazine.org/dark-matt...-20170613/