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Detecting the Traces of Mystery Matter
August 01, 2005Using high-speed collisions between gold atoms, scientists think they have re-created one of the most mysterious forms of matter in the universe - quark-gluon plasma. This form of matter was present during the first microsecond of the Big Bang and may still exist at the cores of dense, distant stars.
UC Davis physics professor Daniel Cebra is one of 543 collaborators on the research. His main role was building the electronic listening devices that collect information about the collisions, a job he compared to "troubleshooting 120,000 stereo systems."
Now, using those detectors, "we look for trends in what happened during the collision to learn what the quark-gluon plasma is like," he said.
"We have been trying to melt neutrons and protons, the building blocks of atomic nuclei, into their constituent quarks and gluons," Cebra said. "We needed a lot of heat, pressure and energy, all localized in a small space."
The scientists produced the right conditions with head-on collisions between the nuclei of gold atoms. The resulting quark-gluon plasma lasted an extremely short time - less than 10-20 seconds, Cebra said. But the collision left tracings that the scientists could measure.
"Our work is like accident reconstruction," Cebra said. "We see fragments coming out of a collision, and we construct that information back to very small points."
Quark-gluon plasma was expected to behave like a gas, but the data shows a more liquid-like substance. The plasma is less compressible than expected, which means that it may be able to support the cores of very dense stars.
"If a neutron star gets large and dense enough, it may go through a quark phase, or it may just collapse into a black hole," Cebra said. "To support a quark star, the quark-gluon plasma would need rigidity. We now expect there to be quark stars, but they will be hard to study. If they exist, they're semi-infinitely far away."
The project is led by Brookhaven National Laboratory and Lawrence Berkeley National Laboratory, with collaborators at 52 institutions worldwide. The work was done in Brookhaven's Relativistic Heavy Ion Collider (RHIC).
UC Davi
"We have been trying to melt neutrons and protons, the building blocks of atomic nuclei, into their constituent quarks and gluons," Cebra said. "We needed a lot of heat, pressure and energy, all localized in a small space."
The scientists produced the right conditions with head-on collisions between the nuclei of gold atoms. The resulting quark-gluon plasma lasted an extremely short time - less than 10-20 seconds, Cebra said. But the collision left tracings that the scientists could measure.
"Our work is like accident reconstruction," Cebra said. "We see fragments coming out of a collision, and we construct that information back to very small points."
Quark-gluon plasma was expected to behave like a gas, but the data shows a more liquid-like substance. The plasma is less compressible than expected, which means that it may be able to support the cores of very dense stars.
"If a neutron star gets large and dense enough, it may go through a quark phase, or it may just collapse into a black hole," Cebra said. "To support a quark star, the quark-gluon plasma would need rigidity. We now expect there to be quark stars, but they will be hard to study. If they exist, they're semi-infinitely far away."
The project is led by Brookhaven National Laboratory and Lawrence Berkeley National Laboratory, with collaborators at 52 institutions worldwide. The work was done in Brookhaven's Relativistic Heavy Ion Collider (RHIC).
UC Davi
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More Quark-gluon Plasma Current Events and Quark-gluon Plasma News Articles
 | Quark-Gluon Plasma: From Big Bang to Little Bang (Cambridge Monographs on Particle Physics, Nuclear Physics and Cosmology) by Kohsuke Yagi, Tetsuo Hatsuda, Yasuo Miake This book introduces quark gluon-plasma (QGP) as a primordial matter composed of quarks and gluons, created at the time of the "Big Bang". After a pedagogical introduction to gauge theories, various aspects of quantum chromodynamic phase transitions are illustrated in a self-contained manner. The cosmological approach and renormalization group are covered, as well as the cosmological and... |
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| Quark-Gluon Plasma: Invited Lectures of Winter School, Puri, Orissa, India, December 5-16, 1989 (Research Reports in Physics) by Bikash Sinha, Santanu Pal | |
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 | Quark-Gluon Plasma 2 This is a sequel to the review volume Quark-Gluon Plasma. There are 13 articles contributed by leading investigators in the field, covering a wide range of topics about the theoretical approach to the subject. These contributions are timely reviews of nearly all the actively pursued problems, written in a pedagogical style suitable for beginners as well as experienced... |
 | The Logic Of Nature, Complexity And New Physics: From Quark-Gluon Plasma to Superstrings, Quantum Gravity and Beyond : Proceedings of the International School of Subnuclear Physics (Subnuclear) |
| Physics and Astrophysics of Quark-gluon Plasma Contributed papers presented at the Third International Conference on Physics and Astrophysics of Quark-Gluon Plasma, held at Jaipur, India in... | |
| The Physics of the Quark-Gluon Plasma: Lisbon 9-12 December 87 by J. Dias De Deus |
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