Essentials
theDiagonal is a personal blog by Mike Gerra, skeptic, technologist, psychologist, artist, humanist, collector of grand, eclectic ideas.theDiagonal blog connects the dots across multiple disciplines for inquisitive, objective and critical thinkers, exploring the vertices of big science, disruptive innovation, global sustainability, illuminating literature and leftfield art. It is on this diagonal that creativity thrives, big ideas take flight and reason triumphs.
Tag Archives: physics
Thursday, October 18, 2012
The Promise of Quantum Computation
Advanced in quantum physics and in the associated realm of quantum information promise to revolutionize computing. Imagine a computer several trillions of times faster than the present day supercomputers — well, that’s where we are heading.
From the New York Times:
THIS summer, physicists celebrated a triumph that many consider fundamental to our understanding of the physical world: the discovery, after a multibillion-dollar effort, of the Higgs boson.
Given its importance, many of us in the physics community expected the event to earn this year’s Nobel Prize in Physics. Instead, the award went to achievements in a field far less well known and vastly less expensive: quantum information.
...read moreMonday, October 1, 2012
Engage the Warp Engines
According to Star Trek fictional history warp engines were invented in 2063. That gives us just over 50 years. While very unlikely based on our current technological prowess and general lack of understanding of the cosmos, warp engines are perhaps becoming just a little closer to being realized. But, please, no photon torpedoes!
From Wired:
NASA scientists now think that the famous warp drive concept is a realistic possibility, and that in the far future humans could regularly travel faster than the speed of light.
A warp drive would work by “warping” spacetime around any spaceship, which physicist Miguel Alcubierre showed was theoretically possible in 1994, albeit well beyond the current technical capabilities of humanity. However, any such Alcubierre drive was assumed to require more energy — equivalent to the mass-energy of the whole planet of Jupiter – than could ever possibly be supplied, rendering it impossible to build.
...read more
Posted in BigBang
Tagged cosmology, Miguel Alcubierre, NASA, physics, speed of light, Star Trek, warp drive
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Saturday, July 23, 2011
First Ever Demonstration of Time Cloaking
From the Physics arXiv for Technology Review:
Physicists have created a “hole in time” using the temporal equivalent of an invisibility cloak.
Invisibility cloaks are the result of physicists’ newfound ability to distort electromagnetic fields in extreme ways. The idea is steer light around a volume of space so that anything inside this region is essentially invisible.
The effect has generated huge interest. The first invisibility cloaks worked only at microwave frequencies but in only a few years, physicists have found ways to create cloaks that work for visible light, for sound and for ocean waves. They’ve even designed illusion cloaks that can make one object look like another.
Today, Moti Fridman and buddies, at Cornell University in Ithaca, go a step further. These guys have designed and built a cloak that hides events in time.
...read moreTuesday, July 19, 2011
Richard Feynman on the Ascendant
Genius – The Life and Science of Richard Feynman by James Gleick was a good first course for those fascinated by Richard Feynman’s significant contributions to physics, cosmology (and percussion).
Now, eight years later come two more biographies that observe Richard Feynman from very different perspectives, reviewed in the New York Review of Books. The first, Lawrence Krauss’s book, Quantum Man is the weighty main course; the second, by Jim Ottaviani and artist Leland Myrick, is a graphic-book (as in comic) biography, and delicious dessert.
In his review — The ‘Dramatic Picture’ of Richard Feynman — Freeman Dyson rightly posits that Richard Feynman’s star may now, or soon, be in the same exalted sphere as Einstein and Hawking. Though, type “Richard” in Google search and wait for its predictive text to fill in the rest and you’ll find that Richard Nixon, Richard Dawkins and Richard Branson rank higher than this giant of physics.
...read moreSunday, July 17, 2011
When the multiverse and many-worlds collide
From the New Scientist:
TWO of the strangest ideas in modern physics – that the cosmos constantly splits into parallel universes in which every conceivable outcome of every event happens, and the notion that our universe is part of a larger multiverse – have been unified into a single theory. This solves a bizarre but fundamental problem in cosmology and has set physics circles buzzing with excitement, as well as some bewilderment.
The problem is the observability of our universe. While most of us simply take it for granted that we should be able to observe our universe, it is a different story for cosmologists. When they apply quantum mechanics – which successfully describes the behaviour of very small objects like atoms – to the entire cosmos, the equations imply that it must exist in many different states simultaneously, a phenomenon called a superposition. Yet that is clearly not what we observe.
...read moreWednesday, July 6, 2011
The Cutting-Edge Physics of Jackson Pollock
Untitled, ca. 1948-49. Jackson Pollock
From Wired:
Jackson Pollock, famous for his deceptively random-seeming drip paintings, took advantage of certain features of fluid dynamics years before physicists thought to study them.
“His particular painting technique essentially lets physics be a player in the creative process,” said physicist Andrzej Herczynski of Boston College, coauthor of a new paper in Physics Today that analyzes the physics in Pollock’s art. “To the degree that he lets physics take a role in the painting process, he is inviting physics to be a coauthor of his pieces.”
...read moreWednesday, June 29, 2011
More subatomic spot changing
From the Economist:
IN THIS week’s print edition we report a recent result from the T2K collaboration in Japan which has found strong hints that neutrinos, the elusive particles theorists believe to be as abundant in the universe as photons, but which almost never interact with anything, are as fickle as they are coy.
Tuesday, June 21, 2011
Cosmic Smoothness
From American Physical Society, Michael J. Hudson:
The universe is expected to be very nearly homogeneous in density on large scales. In Physical Review Letters, Shaun Thomas and colleagues from University College London analyze measurements of the density of galaxies on the largest spatial scales so far—billions of light years—and find that the universe is less smooth than expected. If it holds up, this result will have important implications for our understanding of dark matter, dark energy, and perhaps gravity itself.
In the current standard cosmological model, the average mass-energy density of the observable universe consists of 5% normal matter (most of which is hydrogen and helium), 23% dark matter, and 72% dark energy. The dark energy is assumed to be uniform, but the normal and dark matter are not. The balance between matter and dark energy determines both how the universe expands and how regions of unusually high or low matter density evolve with time.
Friday, June 25, 2010
The Evolution of the Physicist’s Picture of Nature
From Scientific American:
Editor’s Note: We are republishing this article by Paul Dirac from the May 1963 issue of Scientific American, as it might be of interest to listeners to the June 24, 2010, and June 25, 2010 Science Talk podcasts, featuring award-winning writer and physicist Graham Farmelo discussing The Strangest Man, his biography of the Nobel Prize-winning British theoretical physicist.
In this article I should like to discuss the development of general physical theory: how it developed in the past and how one may expect it to develop in the future. One can look on this continual development as a process of evolution, a process that has been going on for several centuries.
...read moreSaturday, February 7, 2009
Is Quantum Mechanics Controlling Your Thoughts?
From Discover:
Graham Fleming sits down at an L-shaped lab bench, occupying a footprint about the size of two parking spaces. Alongside him, a couple of off-the-shelf lasers spit out pulses of light just millionths of a billionth of a second long. After snaking through a jagged path of mirrors and lenses, these minuscule flashes disappear into a smoky black box containing proteins from green sulfur bacteria, which ordinarily obtain their energy and nourishment from the sun. Inside the black box, optics manufactured to billionths-of-a-meter precision detect something extraordinary: Within the bacterial proteins, dancing electrons make seemingly impossible leaps and appear to inhabit multiple places at once.
Tuesday, June 6, 2006
Raiders of the lost dimension
From Los Alamos National Laboratory:
A team of scientists working at the National High Magnetic Field Laboratory’s Pulsed Field Facility at Los Alamos has uncovered an intriguing phenomenon while studying magnetic waves in barium copper silicate, a 2,500-year-old pigment known as Han purple. The researchers discovered that when they exposed newly grown crystals of the pigment to very high magnetic fields at very low temperatures, it entered a rarely observed state of matter. At the threshold of that matter state–called the quantum critical point-the waves actually lose a dimension. That is, the magnetic waves go from a three-dimensional to a two-dimensional pattern. The discovery is yet another step toward understanding the quantum mechanics of the universe.
...read moreFriday, January 6, 2006
Quantum Trickery: Testing Einstein’s Strangest Theory
From the New York Times:
Einstein said there would be days like this.
This fall scientists announced that they had put a half dozen beryllium atoms into a “cat state.”
No, they were not sprawled along a sunny windowsill. To a physicist, a “cat state” is the condition of being two diametrically opposed conditions at once, like black and white, up and down, or dead and alive.
These atoms were each spinning clockwise and counterclockwise at the same time. Moreover, like miniature Rockettes they were all doing whatever it was they were doing together, in perfect synchrony. Should one of them realize, like the cartoon character who runs off a cliff and doesn’t fall until he looks down, that it is in a metaphysically untenable situation and decide to spin only one way, the rest would instantly fall in line, whether they were across a test tube or across the galaxy.
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