Tag Archives: physics

Matter-Antimatter Split Hints at Physics Breakdown

Nature may have handed scientists a new clue in a longstanding mystery: how matter beat out antimatter for dominance of the universe. Early data from twin experiments at the Tevatron, the world’s reigning particle accelerator at Fermi National Accelerator Laboratory (Fermilab) in Batavia, Ill., suggest an unexpected chink in the hugely successful standard model of particle physics.

The twist comes from odd behavior in a particle called the BS (pronounced “B-sub-S”), which flips back and forth between its matter and antimatter forms three trillions times per second. Researchers believe that such a breakdown, known as CP violation, is required to explain why matter is so abundant.

Researchers say the finding is well worth following up to make sure it is not a random clump in the data, as frequently happens in particle physics experiments.
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Neither result on its own was very convincing, so a team of European researchers combined the data, similar to the way medical researchers cull information from independent clinical trials, to look for rare side effects. Together, the data make it 99.7 percent likely that the discrepancy is real, not due to chance, says physicist Luca Silvestrini… Such analyses require making judgment calls, but Silvestrini says he is confident in the finding.

We posted on this study last month in: Explaining the Missing Antimatter

Explaining the Missing Antimatter

Flipping particle could explain missing antimatter

It is one the biggest mysteries in physics – where did all the antimatter go? Now a team of physicists claims to have found the first ever hint of an answer in experimental data. The findings could signal a major crack in the standard model, the theoretical edifice that describes nature’s fundamental particles and forces.

In its early days, the cosmos was a cauldron of radiation and equal amounts of matter and antimatter. As it cooled, all the antimatter annihilated in collisions with matter – but for some reason the proportions ended up lopsided, leaving some of the matter intact.

Physicists think the explanation for this lies with the weak nuclear force, which differs from the other fundamental forces in that it does not act equally on matter and antimatter. This asymmetry, called CP violation, could have allowed the matter to survive to form the elements, stars and galaxies we see today.
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“It is tantalisingly interesting at the moment,” says Val Gibson, an expert on B meson physics at the University of Cambridge. “If it is true, it is earth-shattering.” Jacobo Konigsberg, who leads the CDF collaboration, says that Tevatron researchers are “cautiously excited” about the analysis. He points out that more data needs to be analysed to rule out a statistical fluke, which has happened several times before in particle physics.

Scientists and Engineers in Congress

A list of Congressmen with science PhDs: Vernon Ehlers, Michigan, physics PhD; Rush Holt, New Jersey, physics PhD; John Olver, Massachusetts, chemistry PhD; Brian Baird, Washington, psychology PhD; and now Bill Foster, Illinois, physics PhD. Other scientists, engineers and mathematicians include: Ron Paul, Texas, biology BS, MD; Jerry McNerney, California, math PhD; Dan Lipinski, Illinois, mechanical engineering BS, engineering-economic systems MS; Nancy Boyda, Kansas, chemistry BS; Cliff Stearns, Florida, electrical engineering BS; Joe Barton, Texas, industrial engineering BS. Please comment with additions.

Another Scientist in Congress!

He is not just any old particle physicist, but quite an accomplished one, having been a co-inventor of Fermilab’s antiproton Recycler Ring. Once you’ve mastered antiprotons, the Washington political process should be child’s play. Congratulations!

Vernon Ehlers – “After three years of studying at Calvin College in Grand Rapids, Ehlers transferred and received his undergraduate degree in physics and his Ph.D. in nuclear physics from the University of California at Berkeley in 1960. After six years teaching and research at Berkeley, he moved back to Grand Rapids to Calvin College in 1966 where he taught physics for 16 years and later served as chairman of the Physics Department. During his tenure at Calvin, Ehlers also served as a volunteer science advisor to then-Congressman Gerald R. Ford.”

Russ Holt – Rep. Holt earned his B.A. in Physics from Carleton College in Minnesota and completed his Master’s and Ph.D. at NYU. He has held positions as a teacher, Congressional Science Fellow, and arms control expert at the U.S. State Department where he monitored the nuclear programs of countries such as Iraq, Iran, North Korea, and the former Soviet Union. From 1989 until he launched his 1998 congressional campaign, Holt was Assistant Director of the Princeton Plasma Physics Laboratory, the largest research facility of Princeton University and the largest center for research in alternative energy in New Jersey. He has conducted extensive research on alternative energy and has his own patent for a solar energy device. Holt was also a five-time winner of the game show “Jeopardy.”
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Laws of Physics May Need a Revision

Something seems wrong with the laws of physics

Einstein’s general theory of relativity swept Newton away by showing that gravity operates by distorting space itself.

Even Einstein, however, may not have got it right. Modern instruments have shown a departure from his predictions, too. In 1990 mission controllers at the Jet Propulsion Laboratory (JPL) in Pasadena, California, which operates America’s unmanned interplanetary space probes, noticed something odd happen to a Jupiter-bound craft, called Galileo. As it was flung around the Earth in what is known as a slingshot manoeuvre (designed to speed it on its way to the outer solar system), Galileo picked up more velocity than expected. Not much. Four millimetres a second, to be precise. But well within the range that can reliably be detected.
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Altogether, John Anderson and his colleagues analysed six slingshots involving five different spacecraft. Their paper on the matter is about to be published in Physical Review Letters. Crucially for the idea that there really is a systematic flaw in the laws of physics as they are understood today, their data can be described by a simple formula. It is therefore possible to predict what should happen on future occasions.

That is what Dr Anderson and his team have now done. They have worked out the exact amount of extra speed that should be observed when they analyse the data from a slingshot last November, which involved a craft called Rosetta. If their prediction is correct, it will confirm that the phenomenon is real and that their formula is capturing its essence. Although the cause would remain unknown, a likely explanation is that something in the laws of gravity needs radical revision.

An interesting puzzle that illustrates how scientists attempt to confirm our understanding and real world results. And those efforts include uncertainty and confusion. Too often, I think, people think science is only about absolute truth and facts without any room for questions. We understand gravity well, but that does not mean we have no mysteries yet to solve about gravity.

Research paper: The Anomalous Trajectories of the Pioneer Spacecraft

Phun Physics

Coolest science toy ever

Phun is without question the greatest computer toy in the history of the universe, if this had been around when I was a kid I would be a frickin genius by now. You don’t need things any more. It’s extremely easy to use. As a starter tip, turn gravity off when you’re attaching stuff to the background (right click after selecting “affix” tool).

Very cool. Get your Phun (2D physics software) for free. Phun is a Master of Science Theises by Computing Science student Emil Ernerfeldt.

Some other very cool stuff: Cool Mechanical Simulation System – Scratch from MIT – What Kids can Learn – Lego Autopilot First Flight – Awesome Cat Cam

At the Heart of All Matter

The hunt for the God particle by Joel Achenbach

Physics underwent one revolution after another. Einstein’s special theory of relativity (1905) begat the general theory of relativity (1915), and suddenly even such reliable concepts as absolute space and absolute time had been discarded in favor of a mind-boggling space-time fabric in which two events can never be said to be simultaneous. Matter bends space; space directs how matter moves. Light is both a particle and a wave. Energy and mass are inter- changeable. Reality is probabilistic and not deterministic: Einstein didn’t believe that God plays dice with the universe, but that became the scientific orthodoxy.
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Most physicists believe that there must be a Higgs field that pervades all space; the Higgs particle would be the carrier of the field and would interact with other particles, sort of the way a Jedi knight in Star Wars is the carrier of the “force.” The Higgs is a crucial part of the standard model of particle physics—but no one’s ever found it.
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The Higgs boson is presumed to be massive compared with most subatomic particles. It might have 100 to 200 times the mass of a proton. That’s why you need a huge collider to produce a Higgs—the more energy in the collision, the more massive the particles in the debris. But a jumbo particle like the Higgs would also be, like all oversize particles, unstable. It’s not the kind of particle that sticks around in a manner that we can detect—in a fraction of a fraction of a fraction of a second it will decay into other particles. What the LHC can do is create a tiny, compact wad of energy from which a Higgs might spark into existence long enough and vivaciously enough to be recognized.

Previous posts on CERN and the Higgs boson: The god of small things – CERN Prepares for LHC Operations – CERN Pressure Test Failure – The New Yorker on CERN’s Large Hadron Collider

Great Physics Webcast Lectures

One great example of MIT’s Open Course Ware initiative is Physics I: Classical Mechanics. This course features lecture notes, problem sets with solutions, exams with solutions, links to related resources, and a complete set of videotaped lectures. The 35 video lectures by Professor Lewin, were recorded on the MIT campus during the Fall of 1999. These are some great lectures by a entertainer and educator. Some lecture topics: Newton’s Laws, Momentum – Conservation of Momentum – Center of Mass, Doppler Effect – Binary Stars – Neutron Stars and Black Holes, The Wonderful Quantum World – Breakdown of Classical Mechanics. What a wonderful web it is.

The State of Physics

The Problem with Physics by Peter Woit

Physics has become obsessed with strings, branes and multiple dimensions, yet the big questions remain fundamentally unanswered. Has the time come to admit these wild conjectures have failed, and move on?
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Fundamental physics now finds itself in a historically unprecedented situation. The multi-decade dominance of string theory, along with its extremely speculative research into the implications of exotic scenarios far removed from any hope of testability, has changed the subject in dramatic and fundamental ways.

What used to be considered part of the dubious fringes of science has now become institutionalised within the mainstream. In physicist Lee Smolin’s recent book, The Trouble With Physics, he characterises the current sociology of the field as dominated by ‘groupthink’, with too few physicists willing to admit how far off the tracks things have gone. The nearly infinite complexity of string theory, M-theory, branes, higher dimensions and the multiverse has led to a vast number of possible challenging calculations for people to do to keep themselves busy, all embedded in a mathematical structure far too poorly understood to ever lead to definitive, falsifiable predictions.

The problems of the Standard Model that faced my colleague and I a quarter of a century ago continue to inspire new generations of young theorists to devote their lives to work that might some day lead to real progress. But these problems remain extremely difficult ones, and we have little in the way of promising ideas, with far too much effort going into the evasion of difficulties and the pursuit of the chimera of unification through ever more complex higher dimensional constructions inspired by string theory.

Second Life for Scientist

A farewell to academia and hello to Second Life – a professor of Physics and Astronomy moves on the the second act of his professional career.

Loved the teaching. Loved the science. Couldn’t take the politics. Couldn’t take the tenure stress. That about sums it up.

It is a very good post that spells out several important points that should be addressed including:

Many people have noted that it’s getting harder to get null results published, and that it’s very difficult to get “credit’ for having done good science if you produce a null result… even though such things really should be the bread and butter of what scientists do, if we really believe all the things we say all the time about how science works, and about how the process of science is an honest, open, and objective process.

New Yorker on CERN’s Large Hadron Collider

Can a seventeen-mile-long collider unlock the universe?

A proton is a hadron composed of two up quarks and one down; a neutron consists of two downs and one up.) Fermions also include neutrinos, which, somewhat unnervingly, stream through our bodies at the rate of trillions per second.
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The L.H.C., Doser explained, relies on much the same design, and, in fact, makes use of the tunnel originally dug for LEP. Instead of electrons and positrons, however, the L.H.C. will send two beams of protons circling in opposite directions. Protons are a good deal more massive than electrons—roughly eighteen hundred times more—which means they can carry more energy. For this reason, they are also much harder to manage.

“Basically, what you must have to accelerate any charged particles is a very strong electric field,” Doser said. “And the longer you apply it the more energy you can give them. In principle, what you’d want is an infinitely long linear structure, in which particles just keep getting pushed faster and faster. Now, because you can’t build an infinitely long accelerator, you build a circular accelerator.” Every time a proton makes a circuit around the L.H.C. tunnel, it will receive electromagnetic nudges to make it go faster until, eventually, it is travelling at 99.9999991 per cent of the speed of light. “It gets to a hair below the speed of light very rapidly, and the rest of the time is just trying to sliver down this hair.” At this pace, a proton completes eleven thousand two hundred and forty-five circuits in a single second.