our universe began With a bang that blew everything into existence. But what happened after that is a mystery. Scientists believe that before atoms were formed, or even the protons and neutrons that make them up, there probably existed a hot, soup-like mixture of two elementary particles called quarks and gluons, I think it was churning the space as plasma. And with no one around to observe the universe’s first moments, a coalition of researchers is trying to redo history.
Using the relativistic heavy ion collider at Brookhaven National Laboratory, they essentially created a “little bang” and are using it to study the properties of that quark-gluon plasma. The discovery helps cosmologists improve their still-vague picture of the early universe, and how the oozing and swollen states of infant matter cooled and coalesced into the planets, stars, and galaxies of today. It will help you figure out what happened.
“If you think about a few microseconds after the Big Bang, the universe was at this stage,” says physicist Rongrong Ma, who uses solenoid trackers at the relativistic heavy-ion collider (STAR). say. “If we can understand the properties of such matter from experiments, it will help us understand how the universe evolved.”
Scientists do not know how long this plasma phase lasted. It could have been anywhere from seconds to thousands of years. Because it still exists today in the dense cores of neutron stars, or can be produced when ultra-high-energy particles collide with the Earth’s atmosphere, learning about its properties is essential to the physics of the most extreme space environments. It may be useful to characterize the
These early universes are impossible to study with telescopes and can be traced back to the cosmic microwave background. This is the first light to emerge from the dense early universe 100,000 years after the Big Bang. Everything before that is a dark age of cosmology, both literally and figuratively. Jaki Noronha-Hostler, a nuclear physicist at the University of Illinois at Urbana and his School of Champaign, says theoretical simulations could help fill that gap, but using detectors like STAR could lead to “the big bang.” We can understand very similar systems experimentally.”
Furthermore, quarks and gluons are never found alone in nature, making them difficult to study in isolation. Helen Caines, a Yale University physicist and spokesperson for her STAR experiment, said: Instead, we are stuck in a compound state: protons, neutrons, and more exotic matter such as upsilons, pions, and kamesons. At sufficiently high temperatures, however, the boundaries between these composite grains begin to blur. “That’s the quark-gluon plasma,” says Caines. They are still confined to some volume, but the quarks and gluons within this space are no longer fused together. ‘ may be a bit of a misnomer, she says.
In March, Brookhaven scientists reported: physical review letter By accelerating two beams of gold nuclei near the speed of light and making them collide with each other, they were able to generate a short-time quark-gluon plasma. Then came the clever bit. They used this collision to calculate how hot the plasma got after the Big Bang.
