dark matter

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Related to dark matter: antimatter, Dark energy
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  • noun

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(cosmology) a hypothetical form of matter that is believed to make up 90 percent of the universe

References in periodicals archive ?
After its first run of more than three months, operating a mile underground in the Black Hills of South Dakota, a new experiment named LUX has proven itself the most sensitive dark matter detector in the world.
Over the years, several discoveries 6 including that of a galaxy composed almost entirely of dark matter 6 have indicated the theory of the invisible matter applies to most of the galaxies, including spiral ones like the Milky Way and Andromeda as well as their smaller counterparts named dwarf galaxies.
Dark matter constitutes just over 25 percent of all matter in the Universe but cannot be directly observed, making it one of the biggest mysteries in modern astronomy.
Still, given that dark matter particles have yet to be detected in the lab--where they would be spotted not by collisions with each other but by rare interactions with ordinary matter--some scientists have been hesitant to accept this exotic explanation for the high-energy glow.
Physicist Celine Boehm of Durham University in England and colleagues sought to reconcile this discrepancy by tweaking dark matter theory.
The study, published in the journal, 'Physical Review Letters,' presents a new idea of how dark matter was born and how to identify it with astronomical observations.
Using a new, simple mathematical framework, the study shows that dark matter may have been produced before the Big Bang during an era known as the cosmic inflation when space was expanding very rapidly.
Scientists believe that dark matter makes up about 80 percent of the mass of the universe, but it remains shrouded in mystery.
More recently, supercomputer simulations of the universe's structure have shown that including only visible matter does not reproduce the structures observed in the universe--a closer agreement between observations and simulations is obtained only through including both visible and dark matter.
Essentially, the team will add the signature of dark matter flowing in S-1 to the existing database, so that future detectors are able to pick up on new streams of dark matter based on existing models.
The pulsar, whose atoms have been compacted into neutrons, is so dense that its extreme gravitational field could enhance any possible interactions with dark matter. The white dwarf isn't nearly so compact.
However data from more recent observations has revealed the location of otherwise invisible dark matter, showing it did not separate from its galaxy after all.
"So long as dark matter doesn't interact with the universe around it, we are having a hard time working out what it is."
Whilegalaxiesand dark matter usually go hand-in-hand, scientists have been amazed to discover a 'ghost galaxy' that is missing most, if not all, of its dark matter.
Despite the fact that it represents most probably the best description for the electroweak and strong interactions in nature, we have at least two conclusive evidences that the Standard Model is not complete: (i) through the observation of neutrino oscillations we have established nonzero neutrino masses; (ii) a collection of cosmological and galactic observations requires the presence of nonbaryonic dark matter in our universe.