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Diving deep into the world of emergent gravity | Ars Technica
Getting rid of dark matter would be a big ordeal, so we talk to the man behind the theory.
feedly  cosmology  blackholes  ifttt  Archive  darkEnergy  darkMatter  entropy  generalRelativity  gravity 
may 2017 by otlib
Quantum gas goes below absolute zero
For instance, Rosch and his colleagues have calculated that whereas clouds of atoms would normally be pulled downwards by gravity, if part of the cloud is at a negative absolute temperature, some atoms will move upwards, apparently defying gravity

Another peculiarity of the sub-absolute-zero gas is that it mimics 'dark energy', the mysterious force that pushes the Universe to expand at an ever-faster rate against the inward pull of gravity. Schneider notes that the attractive atoms in the gas produced by the team also want to collapse inwards, but do not because the negative absolute temperature stabilises them.
darkEnergy  absoluteZero  negativeAbsoluteZero  gravity 
january 2017 by cessationoftime
Contents of the Universe
Makeup of the universe notes based on the latest data
cosmology  darkmatter  darkenergy 
november 2016 by darthsunshine
dark matter/dark energy
Notes for data on dark matter and dark energy
darkmatter  darkenergy 
november 2016 by darthsunshine

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