'Bubbles' of Broken Symmetry in Quark Soup at RHIC (w/ Video)

Feb 15, 2010
STAR detector

Scientists at the Relativistic Heavy Ion Collider (RHIC), a 2.4-mile-circumference particle accelerator at the U.S. DOE's Brookhaven National Laboratory, report the first hints of profound symmetry transformations in the hot soup of quarks, antiquarks, and gluons produced in RHIC's most energetic collisions. In particular, the new results, reported in the journal Physical Review Letters, suggest that "bubbles" formed within this hot soup may internally disobey the so-called "mirror symmetry" that normally characterizes the interactions of quarks and gluons.

"RHIC's collisions of heavy nuclei at nearly light speed are designed to re-create, on a tiny scale, the conditions of the . These new results thus suggest that RHIC may have a unique opportunity to test in the laboratory some crucial features of symmetry-altering bubbles speculated to have played important roles in the evolution of the infant universe," said Steven Vigdor, Brookhaven's Associate Laboratory Director for Nuclear and Particle Physics, who oversees research at RHIC.

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Physicists have predicted an increasing probability of finding such bubbles, or local regions, of "broken" symmetry at extreme temperatures near transitions from one phase of matter to another. According to the predictions, the matter inside these bubbles would exhibit different symmetries — or behavior under certain simple transformations of space, time, and particle types — than the surrounding matter. In addition to the symmetry violations probed at RHIC, scientists have postulated that analogous symmetry-altering bubbles created at an even earlier time in the universe helped to establish the preference for matter over in our world.

RHIC's most energetic collisions create the kind of extreme conditions that might be just right for producing such local regions of altered symmetry: A temperature of several trillion degrees Celsius, or about 250,000 times hotter than the center of the Sun, and a transition to a new phase of nuclear matter known as quark-gluon plasma. Furthermore, as the colliding nuclei pass near each other, they produce an ultra-strong magnetic field that facilitates detecting effects of the altered symmetry.

Now, early data from RHIC's STAR detector hint at a violation in what is known as mirror symmetry, or parity. This rule of symmetry suggests that events should occur in exactly the same way whether seen directly or in a mirror, with no directional dependence. But STAR has observed an asymmetric charge separation in particles emerging from all but the most head-on collisions at RHIC: The observations suggest that positively charged may prefer to emerge parallel to the magnetic field in a given collision event, while negatively charged quarks prefer to emerge in the opposite direction. Because this preference would appear reversed if the situation were reflected through a mirror, it appears to violate mirror symmetry.

"In all previous studies of systems governed by the strong force among quarks and gluons, it has been found to very high precision that events and their mirror reflections occur at exactly the same rate, with no directional dependence," Vigdor said. "So this observation at STAR is truly intriguing."

At RHIC, the parity-violating bubbles are formed in a random way, possibly with oppositely oriented charge separation in bubbles at different locations. Averaged over many events there would appear to be no parity violation, even though there were violations locally in each event. Although allowed by quantum chromodynamics (QCD), the underlying theory that describes the strong nuclear force, such local strong parity violation has never been detected directly.

"The key to observing the effect in high-energy nuclear collisions is to study correlations among the particles emerging from the collision," said Nu Xu of Lawrence Berkeley National Laboratory, the spokesperson for the STAR collaboration.

The theory suggests that particles with the same sign of electric charge should tend to be emitted from such local parity-violating regions in the same direction, either both parallel, or both anti-parallel, to the magnetic field arising in the collision, whereas unlike-sign particles should be emitted in opposite directions.

"We have observed a correlation among emitted charged particles of the predicted type, with the degree of directional preference increasing as the collisions vary from head-on to more grazing," Xu said.

STAR data also suggest the local breaking of another form of symmetry, known as charge-parity, or CP, invariance. According to this fundamental physics principle, when energy is converted to mass or vice-versa according to Einstein's famous E=mc2 equation, equal numbers of particles and oppositely charged antiparticles must be created or annihilated. If CP symmetry had not been broken at some very early time in the evolution of our universe, the particles and antiparticles created in equal numbers in the Big Bang would subsequently have annihilated one another in pairs, leaving no matter to form the stars, planets, and people that now populate our world.

While some small violations of CP symmetry have been found in previous laboratory experiments, those violations are far too weak to account for the amount of matter remaining in the universe today. Likewise, the signs of possible local CP violation at STAR cannot explain the global predominance of matter in today's world, but they may offer insight into how such symmetry violations occur.

"The features observed at STAR are qualitatively consistent with predictions of symmetry-breaking domains in hot quark matter," said Vigdor. "Confirmation of this effect and understanding how these domains of broken form at RHIC may help scientists understand some of the most fundamental puzzles of the universe, and will be a subject of intense study in future RHIC experiments."

"For example," he said, "we will want to see if the signal disappears, as predicted, at lower collision energies, where the produced matter is no longer hot enough to make the transition to the quark-gluon plasma phase. These future studies will further check the early work, will test more mundane possible explanations for the observed effects, and will explore a wide range of related phenomena."

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User comments : 9

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broglia
4 / 5 (1) Feb 15, 2010
Jet suppression is an evidence of broken symmetry and it was observed already at Tevatron in Fermilab during 1.96 TeV collisions.

http://arxiv.org/...73v1.pdf

Such parity violation is an analogy of asymmetric jet suppression of many black holes and it was observed first for cooled polarized radioactive cobalt nuclei, which are emanating electrons in one direction preferably. It could be modelled by vortex of compressible gravitating fluid.

http://arxiv.org/...7320.pdf
Caliban
1 / 5 (2) Feb 15, 2010
It kind of makes sense, intuitively- if all these phenomena/processes/relations were homogenous at a time very shortly after zero- then it would be expected that the universe would exhibit large-scale structural regularity- if it existed at all.
But these local asymmetries would have produced the perturbations that became magnified into "foamy" structure, dominated by matter, that we observe today. Or at least that's where my admittedly limited understanding of the science leads my thinking.
bluehigh
1 / 5 (5) Feb 16, 2010
Gluons have never been directly detected. Yeah yeah, detector tracks that can be explained by a statistical model that includes Gluons but that is the best indirect evidence available. More playstation physics.

In reality small disturbances are overwhelmed by the surrounding medium. Why should they grow to dominate the character of the medium?

Press button A to continue ...
broglia
1 / 5 (2) Feb 16, 2010
Gluons have never been directly detected
Gluons correspond dark matter streaks in absolute distance from human scale and they share similar shape and observational controversy, being dual in AdS/CFT scale. On the model of gluons bosonic string theory was proposed originally.

The first direct experimental evidence of gluons was found in 1979 when three-jet events were observed at the electron-positron collider PETRA. The difference between the three-jet events and the two-jet events indicates can only be explained by the original particle in that jet being a gluon.
broglia
not rated yet Feb 16, 2010
..why should they grow to dominate the character of the medium?
This is how energy dispersion is working. The fog never becomes more clear with distance - on the contrary: the small disturbances are additive because of absence of reference frame and their absolute value increases by random walk mechanism. In principle it's a consequence of anthropocentric geometry: giant fluctuation of positive curvature in the role of people could never see (to interact with) other disturbances quite symmetric, but biased toward positive values, too.
seneca
not rated yet Feb 18, 2010
Chirality violation observed in RHIC experiments is in fact well expected chiral magnetic effect (Kharzeev, McLerran & all 2008) and some groups even proposed it for determination of magnetic field intensity inside of quark-gluon condensates.

http://physics.ap...s/v2/104
Parsec
not rated yet Feb 25, 2010
Gluons have never been directly detected. Yeah yeah, detector tracks that can be explained by a statistical model that includes Gluons but that is the best indirect evidence available. More playstation physics.


In fact quarks have never been directly observed either. Are you seriously proposing that quark's and gluon's don't exist?
frajo
2.3 / 5 (3) Feb 26, 2010
Are you seriously proposing that quark's and gluon's don't exist?
The question of "reality" is owned by philosophy. Physicist have to care only for well working models.
broglia
not rated yet Feb 26, 2010
In fact quarks have never been directly observed either
Pairs of heaviest top quark were observed already...

http://www.physor...209.html