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Through precise cosmological measurements, scientists know that about 4.6% of the energy of the Universe is made of baryonic matter (normal atoms), about 23% is made of dark matter, and the remaining 72% or so is dark energy. Scientists also know that almost all the baryonic matter in the observable Universe is matter (with a positive baryon charge) rather than antimatter (with a negative baryon charge). But exactly why this matter and energy came to be this way is still an open question. In a recent study, physicists have proposed a new mechanism that can generate both the baryon asymmetry and the dark matter density of the Universe simultaneously.
The scientists, Hooman Davoudiasl from Brookhaven National Laboratory in Upton, New York; David Morrissey and Sean Tulin from TRIUMF in Vancouver, British Columbia; and Kris Sigurdson from the University of British Columbia, also in Vancouver, have published their new proposal in a recent issue of Physical Review Letters. They’ve dubbed the new mechanism "hylogenesis" from the Greek words "hyle," meaning "primordial matter," and "genesis," meaning "origin."
"There are two problems in theoretical physics we are trying to address at once," Sigurdson said. "The baryon asymmetry (why do we have atoms but not antiatoms in the Universe?) has really been a problem since Paul Dirac proposed antimatter in 1928 and it was discovered in 1932. And what is the dark matter? Hints of dark matter have been around since Fritz Zwicky discovered missing mass in the Coma Cluster in 1933, but its identity is still unknown. This mechanism links the formation of atoms and dark matter and helps resolve the baryon asymmetry mystery, as the total dark plus visible baryon balance of the Universe is restored."
Originally posted by SpaceJ
reply to post by paxnatus
We know dark matter is there but we can't fully explain the nature of its behavior. We observe the gravitational effects of dark matter's presence, but that's about as far as our understanding goes. We know that some invisible matter is holding things together, because the mass of the matter that we can see doesn't account for the total mass of the systems (like if observing a star cluster, the mass just doesn't add up right without the inclusion of dark matter). Dark matter still remains a great mystery, for the most part, so any news on the subject is pretty good news