Before the Big Bang
Posted on December 16, 2008 1 Comment
Did our cosmos exist before the big bang?
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LQC is in fact the first tangible application of another theory called loop quantum gravity, which cunningly combines Einstein’s theory of gravity with quantum mechanics. We need theories like this to work out what happens when microscopic volumes experience an extreme gravitational force, as happened near the big bang, for example.
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If LQC turns out to be right, our universe emerged from a pre-existing universe that had been expanding before contracting due to gravity. As all the matter squeezed into a microscopic volume, this universe approached the so-called Planck density, 5.1 × 1096 kilograms per cubic metre. At this stage, it stopped contracting and rebounded, giving us our universe.
In classical cosmology, a phenomenon called inflation caused the universe to expand at incredible speed in the first fractions of a second after the big bang. This inflationary phase is needed to explain why the temperature of faraway regions of the universe is almost identical, even though heat should not have had time to spread that far – the so-called horizon problem. It also explains why the universe is so finely balanced between expanding forever and contracting eventually under gravity – the flatness problem. Cosmologists invoke a particle called the inflaton to make inflation happen, but precious little is known about it.
Related: Cosmology Questions Answered – Quantum Mechanics Made Relatively Simple Podcasts – 10 Most Beautiful Physics Experiments – Extra-Universal Matter
Science Serving Society – Speech Australian Minister for Innovation
Posted on March 24, 2008 No Comments
Kim Carr, Minister for Innovation, Australia, speech to the National Press Club of Australia: Science meets Parliament
When societies invest in science, they are investing in their own future. They are entitled to expect a fair return on that investment.
They’re entitled to know we are using the country’s intellectual and technical capacity to deliver outcomes that matter to them – stronger communities, more good jobs, a cleaner environment, better public services, a richer culture, greater security for themselves and their children. Everybody here knows the rules of professional scientific conduct – think independently, put emotion aside, reject received authority, be faithful to the evidence, communicate openly.
These are good rules – rules I wholeheartedly endorse – but there’s one more I’d like to add – remember your humanity. Remember you’re part of a wider society – one that you have a special ability and therefore a special duty to serve. This doesn’t just apply in the physical sciences, but in the humanities and social sciences as well. When I say science I mean knowledge in all its forms.
Related: Engineering Economic Benefits – Authors of Scientific Articles by Country – Economic Strength Through Technology Leadership – Science and Engineering in Global Economics – Aussies Look to Finnish Innovation Model – Invest in Science for a Strong Economy
Read more
Laws of Physics May Need a Revision
Posted on March 8, 2008 No Comments
Something seems wrong with the laws of physics
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
Related: NASA Baffled by Unexplained Force Acting on Space Probes – Mysterious Effect May Influence Spacecraft Trajectories – Earth’s rotation may account for wayward spacecraft – Pioneer anomaly put to the test – Understanding Evolution – Scientists Search for Clues To Bee Mystery
Tags: NASA, open access paper, physics, research paper, Science, scientific inquiry, space
Pynchonverse Science
Posted on March 2, 2008 1 Comment
Mind-Bending Science in Thomas Pynchon’s Mind-Bending Novel Against The Day: Part I
One reviewer claimed that a new generation of writers has a “grasp of the systems that fascinate Pynchon — science, capitalism, religion, politics, technology — [that] is surer, more nuanced, more adult and inevitably yields more insight into how those systems work than Pynchon offers here.” When it comes to science at least, this claim is not true – Pynchon’s achievement in Against the Day proves that he is peerless as a poet who can mine science for gems of insight and set them into the context of the humanity that is the ultimate concern of his novels.
This great post offers a detailed explanation of some of the science related to Pynchon’s writing.
Related: Books by Thomas Pynchon (with online resource links) – New Yorker Review of Against the Day
At the Heart of All Matter
Posted on February 27, 2008 2 Comments

The hunt for the God particle by Joel Achenbach
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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
Tags: basic research, centers of excellence, CERN, physics, science explained
Biggest Black Hole’s Mass = 18 Billion Suns
Posted on January 10, 2008 3 Comments
Biggest black hole in the cosmos discovered
The black hole is about six times as massive as the previous record holder and in fact weighs as much as a small galaxy. It lurks 3.5 billion light years away, and forms the heart of a quasar called OJ287.
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The smaller black hole, which weighs about 100 million Suns, orbits the larger one on an oval-shaped path every 12 years. It comes close enough to punch through the disc of matter surrounding the larger black hole twice each orbit, causing a pair of outbursts that make OJ287 suddenly brighten.
Time
Posted on July 27, 2007 3 Comments
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Einstein’s theories also opened a rift in physics because the rules of general relativity (which describe gravity and the large-scale structure of the cosmos) seem incompatible with those of quantum physics (which govern the realm of the tiny). Some four decades ago, the renowned physicist John Wheeler, then at Princeton, and the late Bryce DeWitt, then at the University of North Carolina, developed an extraordinary equation that provides a possible framework for unifying relativity and quantum mechanics. But the Wheeler-ÂDeWitt equation has always been controversial, in part because it adds yet another, even more baffling twist to our understanding of time.
“One finds that time just disappears from the Wheeler-DeWitt equation,” says Carlo Rovelli, a physicist at the University of the Mediterranean in Marseille, France. “It is an issue that many theorists have puzzled about. It may be that the best way to think about quantum reality is to give up the notion of time—that the fundamental description of the universe must be timeless.”
Interesting. As usual, quantum actions seem bizarre. Related: Quantum Mechanics Made Relatively Simple Podcasts – Physicists Observe New Property of Matter – Particles and Waves – Quantum Theory Fails Reality Checks – Physics Concepts in 60 Seconds
The Best Science Books
Posted on November 21, 2006 3 Comments
An interesting post from John Dupuis discusses several lists of the best and worst science books. Some of the best books from the lists, based on importance, what strikes my mood right now, what I enjoyed… (those I list could easily change on another day):
- The Origin of Species and the Voyage of the Beagle by Charles Darwin
- Principia (Mathematical Principles of Natural Philosophy) by Isaac Newton
- Physica (Physics) by Aristotle
- The Selfish Gene by Richard Dawkins
- The Meaning of Relativity by Albert Einstein
- The Structure of Scientific Revolutions by Thomas Kuhn
- The Feynman Lectures on Physics by Richard P. Feynman and Robert B. Leighton and Matthew Sands
- The Double Helix by James Watson
- Chaos by James Gleick
- The Phenomenon of Man by Pierre Teihard de Chardin
- A Brief History of Time by Stephen Hawking
- The Mismeasure of Man by Stephen Jay Gould
Please share your favorite science books.
Related: our science and engineering book page – 2005 Science book gift suggestions (from the list above The Selfish Gene, Chaos, A Brief History of Time and The Mismeasure of Man are likely the best gifts for the widest audiences).
20 Scientists Who Have Helped Shape Our World
Posted on August 16, 2006 2 Comments
20 Scientists Who Have Helped Shape Our World (pdf document) from the National Science Resources Center
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The results of Dr. Borlaug’s work are encouraging: India, for example, harvests six times more wheat today than it did only 40 years ago. This increase in wheat production in poor countries has been called the “Green Revolution.” It has been written about Dr. Borlaug that he has saved more lives than anyone else who ever lived.
For his scientific achievements, Dr. Borlaug was awarded the 1970 Nobel Peace Prize. Today, at age 90, Dr. Borlaug remains active in science as a distinguished professor of international agriculture at Texas A&M University
Others include: