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Uncertain Principles

Thoughts on physics, politics, and pop culture, by a physics professor at a small liberal arts college, plus occasional conversations with his dog.

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"Uncertain Principles" features the miscellaneous ramblings of a physicist at a small liberal arts college. Physics, politics, pop culture, and occasional conversations with his dog.

Chad Orzel "Prof. Orzel gives the impression of an everyday guy who just happens to have a vast but hidden knowledge of physics." (anonymous student evaluation comment)

Emmy, the Queen of Niskayuna Emmy is a German Shepherd mix, and the Queen of Niskayuna. She likes treats, walks, chasing bunnies, and quantum physics.

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Atoms and Molecules:

Trapped Antihydrogen

Category: ResearchBlogging

The big physics-y news story of the moment is the trapping of antihydrogen by the ALPHA collaboration at CERN. The article itself is paywalled, because this is Nature, but one of the press offices at one of the institutions involved...

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Relativity on a Human Scale: "Optical Clocks and Relativity"

Category: Physics

As mentioned in yesterday's post on ion trapping, a month or so back Dave Wineland's group at NIST published a paper in Science on using ultra-precise atomic clocks to measure relativistic effects. If you don't have a subscription to Science,...

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How Do You Trap an Ion, Anyway?

Category: Physics

One of the many physics stories I haven't had time to blog about recently is the demonstration of relativistic time effects using atomic clocks. I did mention a DAMOP talk about the experiment, but the actual paper was published in...

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Physics Is All About Analogies

Category: Physics

Regular commenter onymous left a comment to my review of Warped Passages that struck me as a little odd: The extended analogy between the renormalization group and a bureaucracy convinced me that she was trying way too hard to make...

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Why I'm Skeptical About the Changing Fine-Structure Constant

Category: Physics

Not long ago, a new preprint on the fine structure constant got a bunch of press, nicely summed up by the Knight Science Journalism Tracker last week. I meant to say something about this last week, but what with it...

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Quantum Statistical Poll: Favorite Boson?

Category: Physics

A fairly straightforward question: quantum physicists divide the world into two categories of things, fermions and bosons. What's your favorite object having integer spin? What's your favorite boson?online survey Superpositions of answers, while allowed in properly symmetrized wavefunctions, are not...

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Counterfactual Physics: Lorentz Variance?

Category: Physics

What would happen in a world where the speed of light was not the same for all observers, but time was?

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The ABC's of AMO Physics

Category: Physics

Over at Confused at a Higher Level, Melissa offers an alphabetical list of essential supplies for a condensed matter experimentalist at a small college. This is a fun idea for back-to-school time, so I'll steal it, and offer the following...

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Indirect Excitation Control: Ultrafast Quantum Gates for Single Atomic Qubits

Category: Physics

Last week, John Baez posted a report on a seminar by Dzimitry Matsukevich on ion trap quantum information issues. In the middle of this, he writes: Once our molecular ions are cold, how can we get them into specific desired...

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Melting Simulated Insulators

Category: Condensed Matter

The Joerg Heber post that provided one of the two papers for yesterday's Hanbury Brown Twiss-travaganza also included a write-up of a new paper in Nature on Mott insulators, which was also written up in Physics World. Most of the...

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