48 posts tagged with Math *and* Physics. (View popular tags)

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Finite time blowup for an averaged three-dimensional Navier-Stokes equation - "[Terence Tao] has shown that in an alternative abstract universe closely related to the one described by the Navier-Stokes equations, it is possible for a body of fluid to form a sort of computer, which can build a self-replicating fluid robot that, like the Cat in the Hat, keeps transferring its energy to smaller and smaller copies of itself until the fluid 'blows up.' " [1,2,3] (previously)

posted by kliuless on Mar 9, 2014 - 15 comments

posted by kliuless on Mar 9, 2014 - 15 comments

Discovering Free Will (Part II, Part III) - a nice discussion of the Conway-Kochen "Free Will Theorem". [more inside]

posted by Wolfdog on Mar 4, 2014 - 92 comments

posted by Wolfdog on Mar 4, 2014 - 92 comments

Network Theory Overview - "The idea: nature and the world of human technology are full of networks! People like to draw diagrams of networks. Mathematical physicists know that in principle these diagrams can be understood using category theory. But why should physicists have all the fun? This is the century of *understanding living systems and adapting to life on a finite planet*. Math isn't the main thing we need, but it's got to be part of the solution... so one thing we should do is develop a unified and powerful theory of networks." (via ;)

posted by kliuless on Mar 2, 2014 - 17 comments

posted by kliuless on Mar 2, 2014 - 17 comments

What would happen if a cue ball struck a rack of 15 perfectly round, frictionless billiard balls, exactly head-on?

posted by escabeche on Feb 3, 2014 - 31 comments

posted by escabeche on Feb 3, 2014 - 31 comments

M.I.T. professor Max Tegmark explores the possibility that math does not just describe the universe, but makes the universe.

posted by COD on Jan 14, 2014 - 111 comments

posted by COD on Jan 14, 2014 - 111 comments

Closing in on the twin prime conjecture (Quanta) - "Just months after Zhang announced his result, Maynard has presented an independent proof that pushes the gap down to 600. A new Polymath project is in the planning stages, to try to combine the collaboration's techniques with Maynard's approach to push this bound even lower." [more inside]

posted by kliuless on Dec 1, 2013 - 16 comments

posted by kliuless on Dec 1, 2013 - 16 comments

Revelations in the field of quantum physics have resulted in the discovery of the Amplituhedron, a jewel-like higher dimensional object whose volume elegantly predicts fundamental physical processes that took the brilliant Dr. Richard Feynman hundreds of pages of abstruse mathematics to describe.
The theoretical manifold not only enables simple pen-and-paper calculation of physics that would normally require supercomputers to work out, but also challenges basic assumptions about the nature of reality -- forgoing the core concepts of locality and unitarity and suggesting that space and time are merely emergent properties of a timeless, infinitely-sided "master amplituhedron," whose geometry represents the sum total of all physical interactions.
**More:** The 152-page source paper on arXiv [PDF] - Lead author Nima Arkani-Hamed's hour-long lecture at SUSY 2013 - Scans of Arkani-Hamed's handwritten lecture notes - A far more detailed lecture series "Scattering Without Space Time": one, two, three - Arkani-Hamed previously on MeFi - A hot-off-the-presses Wikipedia page (watch this space)

posted by Rhaomi on Sep 18, 2013 - 128 comments

posted by Rhaomi on Sep 18, 2013 - 128 comments

Paperscape is a searchable 2-dimensional visualization of the 800,000+ scientific papers (mostly in physics and math) on the arXiv preprint server.

posted by escabeche on Aug 18, 2013 - 20 comments

posted by escabeche on Aug 18, 2013 - 20 comments

Avogadro Project - The International Avogadro project relates the kilogram to the mass of a fixed number of atoms by measuring the number of atoms in a sphere of silicon.
I'll leave this here.

posted by hypersloth on Jun 8, 2013 - 26 comments

posted by hypersloth on Jun 8, 2013 - 26 comments

Every film Pixar has produced has landed in the top fifty highest-grossing animated films of all time. What's their secret? Mathematics. Oh, and 22 Rules of Storytelling. [more inside]

posted by zarq on Mar 8, 2013 - 40 comments

posted by zarq on Mar 8, 2013 - 40 comments

Surely you've heard of the physicist Maxwell, but what about Oliver Heaviside? Oliver Heaviside: A first-rate oddity.

posted by Evernix on Feb 14, 2013 - 14 comments

posted by Evernix on Feb 14, 2013 - 14 comments

Henry Reich of Minute Physics shares his favorite science blogs, video channels, and other resources on the web. (Minute Physics previously) [more inside]

posted by ocherdraco on Feb 8, 2013 - 5 comments

posted by ocherdraco on Feb 8, 2013 - 5 comments

The Nature of Computation - Intellects Vast and Warm and Sympathetic: "I hand you a network or graph, and ask whether there is a path through the network that crosses each edge exactly once, returning to its starting point. (That is, I ask whether there is a 'Eulerian' cycle.) Then I hand you another network, and ask whether there is a path which visits each node exactly once. (That is, I ask whether there is a 'Hamiltonian' cycle.) How hard is it to answer me?" (via) [more inside]

posted by kliuless on Dec 1, 2012 - 19 comments

posted by kliuless on Dec 1, 2012 - 19 comments

Q: How many miles is it to the crab nebula? How does one even figure this out?
A: The cosmic distance ladder! Here's a talk by Fields medalist Terrence Tao on methods for indirect calculation of distances to astronomical objects. Here's Tao's blog post on the subject, including the slides for the talk. And here's a Wikipedia page. [more inside]

posted by kaibutsu on Oct 22, 2012 - 17 comments

posted by kaibutsu on Oct 22, 2012 - 17 comments

Einstein described the "Tea Leaf Paradox" (more) to explain Baer's Law of erosion. [more inside]

posted by Algebra on Aug 19, 2012 - 9 comments

posted by Algebra on Aug 19, 2012 - 9 comments

Racetrack is a game with very simple rules which nonetheless does a surprisingly good job of simulating the acceleration, braking, and handling of a race car. It can teach not only about inertia and kinematics, but also about optimal racing lines. Racetrack can be played with nothing more than a piece of graph paper and a pen, but there is also an online implementation called Vector Racer.

posted by 256 on Aug 11, 2012 - 42 comments

posted by 256 on Aug 11, 2012 - 42 comments

Morton and Vicary on the Categorified Heisenberg Algebra - "In quantum mechanics, position times momentum does not equal momentum times position! This sounds weird, but it's connected to a very simple fact. Suppose you have a box with some balls in it, and you have the magical ability to create and annihilate balls. Then there's one more way to create a ball and then annihilate one, than to annihilate one and then create one. Huh? Yes: if there are, say, 3 balls in the box to start with, there are 4 balls you can choose to annihilate after you've created one but only 3 before you create one..." [more inside]

posted by kliuless on Jul 21, 2012 - 78 comments

posted by kliuless on Jul 21, 2012 - 78 comments

What is the Dzhanibekov effect? Known as the Tennis Racket theorem in English and documented by Vladimir Dzhanibekov in 1985 space, it is the result of unstable rotation about a principle axis.

posted by Algebra on Apr 6, 2012 - 21 comments

posted by Algebra on Apr 6, 2012 - 21 comments

Amalie Noether: The Mighty Mathematician You’ve Never Heard Of

posted by jjray on Mar 27, 2012 - 49 comments

posted by jjray on Mar 27, 2012 - 49 comments

Old Theories As Limits of New Ones -- Theoretical physicist, Lubos Motl, takes a brief tour through the history of physics, and explains the simple mathematical relationship of old theories to the theories that replace them.

posted by empath on Aug 5, 2011 - 16 comments

posted by empath on Aug 5, 2011 - 16 comments

Larry Gonick is a veteran American cartoonist best known for his delightful comic-book guides to science and history, many of which have previews online. Chief among them is his long-running *Cartoon History of the Universe* (later *The Cartoon History of the Modern World*), a sprawling multi-volume opus documenting everything from the Big Bang to the Bush administration. Published over the course of three decades, it takes a truly global view -- its time-traveling Professor thoroughly explores not only familiar topics like Rome and World War II but the oft-neglected stories of Asia and Africa, blending caricature and myth with careful scholarship (cited by fun illustrated bibliographies) and tackling even the most obscure events with intelligence and wit. This savvy satire carried over to Gonick's Zinn-by-way-of-*Pogo* chronicle *The Cartoon History of the United States*, along with a bevy of *Cartoon Guides* to other topics, including *Genetics, Computer Science, Chemistry, Physics, Statistics, The Environment*, and (yes!) *Sex*. Gonick has also maintained a few sideprojects, such as a webcomic look at Chinese invention, assorted math comics (previously), the *Muse* magazine mainstay *Kokopelli & Co.* (featuring the shenanigans of his "New Muses"), and more. See also these lengthy interview snippets, linked previously. Want more? Amazon links to the complete oeuvre inside! [more inside]

posted by Rhaomi on Jun 6, 2011 - 29 comments

posted by Rhaomi on Jun 6, 2011 - 29 comments

Mark Taylor. Reform the PhD system or close it down. Nature **472**, 261 (2011) [more inside]

posted by jeffburdges on Apr 26, 2011 - 54 comments

posted by jeffburdges on Apr 26, 2011 - 54 comments

Horizon asks "What is reality?" -- youtube for links for those outside the UK: 1, 2, 3, 4. It's a hard question. To help you answer it, Stanford has a set of free courses available on line by Leonard Susskind:
General Relativity, Cosmology, New Revolutions in Particle Physics, Quantum Entanglement, Special Relativity, Classical Mechanics, Statistical Mechanics, The Standard Model. (Each link is to lecture 1 of a full college course of a dozen or so lectures.) If you need help with the math, the Khan Academy should help get you up to speed.

posted by empath on Jan 23, 2011 - 67 comments

posted by empath on Jan 23, 2011 - 67 comments

The Geometry of the Snail Ball [pdf] - an interesting article (with some DIY advice at the end) about a toy shop curiosity you may have encountered.

posted by Wolfdog on Nov 16, 2010 - 25 comments

posted by Wolfdog on Nov 16, 2010 - 25 comments

A brief tour of the mysteriously universal laws of mathematics and nature. [more inside]

posted by kliuless on Oct 24, 2010 - 33 comments

posted by kliuless on Oct 24, 2010 - 33 comments

The 300th issue of This Week's Finds in Mathematical Physics will be the last. It is not an exaggeration to say that when John Baez started publishing TWF in 1993, he invented the science blog, and an (academic) generation has now grown up reading his thoughts on higher category theory, zeta functions, quantum gravity, crazy pictures of roots of polynomials, science fiction, and everything else that can loosely be called either "mathematical" or "physics."
Baez continues to blog actively at n-category cafe and the associated nLab (an intriguingly fermented commune of mathematicians, physicists, and philosophers.) He is now starting a new blog, Azimuth, "centered around the theme of *what scientists can do to help save the planet*."

posted by escabeche on Aug 14, 2010 - 17 comments

posted by escabeche on Aug 14, 2010 - 17 comments

"Take a little bad psychology, add a dash of bad philosophy and ethics, and liberal quantities of bad logic, and any economist can prove that the demand curve for a commodity is negatively inclined." MIT economist Andrew Lo and string theorist turned asset manager Mark Mueller on the "physics envy" that plagues economics, and how to stop worrying and love uncertainty.

posted by escabeche on Apr 1, 2010 - 37 comments

posted by escabeche on Apr 1, 2010 - 37 comments

From 1980 - 1988, a science education series called 3-2-1 Contact ran on PBS. Produced by Children's Television Workshop, the series was geared toward an older audience than other popular CTW offerings Sesame Street and The Electric Company, and focused on teaching kids about science, math and the world around them. [more inside]

posted by zarq on Jan 25, 2010 - 79 comments

posted by zarq on Jan 25, 2010 - 79 comments

"...the best place to hide bulls**t is in a refereed journal that’s not open-access!" The math-physics blog n-category cafe digs into the curious case of M.S. El Naschie. El Naschie is editor-in-chief of the journal Chaos, Solitons, and Fractals, published by the well-respected scientific publisher Elsevier and sold to academic libraries for US$4,520 a year. The problem? El Naschie has published 322 of his own papers in the journal -- papers that John Baez (of "This Week's Finds in Mathematical Physics" and "The Crackpot Index") describes as "vague, dreamlike imagery," "undisciplined numerology larded with impressive buzzwords," and "total baloney." Is El Naschie a reverse Sokal? Or a Markov process for producing random publishable papers? One thing's for sure -- he knows how to cure cancer.

posted by escabeche on Nov 12, 2008 - 49 comments

posted by escabeche on Nov 12, 2008 - 49 comments

A math professor was explaining a particularly complicated calculus concept to his class when a frustrated pre-med student interrupts him. "Why do we have to learn this stuff?" the pre-med blurts out. The professor pauses, and answers matter-of-factly: "Because math saves lives." "How?" demanded the student. "How on Earth does calculus save lives?" "Because," replied the professor, "it keeps certain people out of medical school."

posted by cthuljew on Nov 9, 2008 - 82 comments

posted by cthuljew on Nov 9, 2008 - 82 comments

Symmetry. Shakespeare. Islamic medicine. Creative writing challenges. Four podcast series from University of Warwick.

posted by Wolfdog on Nov 18, 2007 - 2 comments

posted by Wolfdog on Nov 18, 2007 - 2 comments

"This is a story of how the impossible became possible. How, for centuries, scientists were absolutely sure that solids (as well as decorative patterns like tiling and quilts) could only have certain symmetries - such as square, hexagonal and triangular - and that most symmetries, including five-fold symmetry in the plane and icosahedral symmetry in three dimensions (the symmetry of a soccer ball), were strictly forbidden. Then, about twenty years ago, a new kind of pattern, known as a "quasicrystal," was envisaged that shatters the symmetry restrictions and allows for an infinite number of new patterns and structures that had never been seen before, suggesting a whole new class of materials...."

Physicist Paul J. Steinhardt delivers a fascinating lecture (WMV) on tilings and quasicrystals. However, it turns out science was beaten to the punch: a recent paper (PDF) suggests Islamic architecture developed similar tilings centuries earlier.

posted by parudox on Mar 18, 2007 - 11 comments

Physicist Paul J. Steinhardt delivers a fascinating lecture (WMV) on tilings and quasicrystals. However, it turns out science was beaten to the punch: a recent paper (PDF) suggests Islamic architecture developed similar tilings centuries earlier.

posted by parudox on Mar 18, 2007 - 11 comments

PhET - Physics Education Technology offers this astoundingly large library of online physics simulations. Play orbital billiards. Land on a cheesy moon. Experiment with sound. Or try more advanced quantum physics simulators. Still bored? Try the "cutting edge" catagory. Here's the complete index. (Warnings: Frames, Flash, Javascript, Java applets, graphics, sound, quantum timesuck.)

posted by loquacious on Feb 3, 2007 - 7 comments

posted by loquacious on Feb 3, 2007 - 7 comments

Raft to the Future: An article about the weirdness of physical models of the universe, how that weirdness correlates to the inherent incompleteness of mathematical systems, and how time itself can *emerge* at the fringes of these incomplete models.

posted by knave on Nov 6, 2006 - 46 comments

posted by knave on Nov 6, 2006 - 46 comments

Condoleezza holds a watermelon just over the edge of the roof of the 300-foot Federal Building, and tosses it up with a velocity of 20 feet per second. Using the formula provided, when the watermelon will hit the ground? Bellevue Community College President Jean Floten asked the Pluralism Steering Committee to take the lead on this, and to complete their task quickly.

posted by three blind mice on Apr 13, 2006 - 214 comments

posted by three blind mice on Apr 13, 2006 - 214 comments

This Week's Finds in Mathematical Physics. A geek's paradise. Reminiscent of Scientific American's *Mathematical Games.*

posted by five fresh fish on Apr 1, 2006 - 11 comments

posted by five fresh fish on Apr 1, 2006 - 11 comments

"...the answer to Life, the Universe, and Everything is..." "Yes? Yes!?" "...42."

via Dyson, Montgomery, Princeton, a cup of tea - as presented by Seed Magazine.

posted by loquacious on Mar 28, 2006 - 41 comments

via Dyson, Montgomery, Princeton, a cup of tea - as presented by Seed Magazine.

posted by loquacious on Mar 28, 2006 - 41 comments

Ripple Tank Simulation is a delightful, mesmeric java applet simulation of a ripple tank. It demonstrates two dimensional wave phenomena such as interference, diffraction, refraction, resonance, phased arrays, and the Doppler effect (do try the 3D view). From Paul Falstad's fantastic collection of Math, Physics and Engineering Applets.

posted by MetaMonkey on Jan 25, 2006 - 14 comments

posted by MetaMonkey on Jan 25, 2006 - 14 comments

Flash Animations for Physics. Animations and interactive demos available in many varieties, such as classical mechanics, nuclear, quantum, and relativistic. There's even a nice explanation of the forces at work in Curling. And if that doesn't wet your geek whistle, then take a peek at the patterns of Visual Math.

posted by Gamblor on Nov 11, 2005 - 7 comments

posted by Gamblor on Nov 11, 2005 - 7 comments

Jim Loy's Mathematics Page is (among other things) a collection of interesting theorems (like Napoleon's Triangle theorem), thoughtful discussions of both simple and complex math, and geometric constructions (my personal favorite); the latter of which contains surprisingly-complex discussions on the trisection of angles, or the drawing of regular pentagons.

Similarly enthralling are the pages on Billiards (and the physics of), Astronomy (and the savants of), and Physics (and the Phlogiston Theory of), all of which are rife with illustrations and diagrams. See the homepage for much more.

If you like your geometric constructions big, try Zef Damen's Crop Circle Reconstructions.

posted by odinsdream on Sep 14, 2005 - 8 comments

Similarly enthralling are the pages on Billiards (and the physics of), Astronomy (and the savants of), and Physics (and the Phlogiston Theory of), all of which are rife with illustrations and diagrams. See the homepage for much more.

If you like your geometric constructions big, try Zef Damen's Crop Circle Reconstructions.

posted by odinsdream on Sep 14, 2005 - 8 comments

Java applets to help visualize various concepts in math, physics, and engineering

posted by Gyan on Sep 9, 2005 - 13 comments

posted by Gyan on Sep 9, 2005 - 13 comments

The Logic of Diversity "A new book, *The Wisdom of Crowds* [..:] by The New Yorker columnist James Surowiecki, has recently popularized the idea that groups can, in some ways, be smarter than their members, which is superficially similar to Page's results. While Surowiecki gives many examples of what one might call collective cognition, where groups out-perform isolated individuals, he really has only one explanation for this phenomenon, based on one of his examples: jelly beans [...] averaging together many independent, unbiased guesses gives a result that is probably closer to the truth than any one guess. While true — it's the central limit theorem of statistics — it's far from being the only way in which diversity can be beneficial in problem solving." (Three-Toed Sloth)

posted by kliuless on Jun 20, 2005 - 6 comments

posted by kliuless on Jun 20, 2005 - 6 comments

The Prime Number Shitting Bear, Finite Simple Group of Order Two[video], Math Jokes, Physics Jokes

posted by apathy0o0 on May 11, 2005 - 29 comments

posted by apathy0o0 on May 11, 2005 - 29 comments

The universe in just two symbols. The rest, as they say, is details. No wonder the "Physics Establishment" is trying to keep this quiet. The author, having conquered the universe in general, tackles poetry, as well.

posted by Wolfdog on Dec 8, 2004 - 20 comments

posted by Wolfdog on Dec 8, 2004 - 20 comments

Estimating the Airspeed Velocity of an Unladen Swallow. Hashing out the classic question with Strouhal numbers and simplified flight waveforms. The site also includes other very well presented number crunching articles too. [via The One]

posted by riffola on Nov 28, 2003 - 10 comments

posted by riffola on Nov 28, 2003 - 10 comments

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