About the SA Blog Network

Posts Tagged "relativity"

Life, Unbounded

Krugman’s Theory of Interstellar Trade

Are we all the same? (Credit. C. Scharf, original LeCire/Wikipedia)

Everyone needs a little light relief sometimes, including the Nobel winning economist and writer/blogger extraordinaire Paul Krugman. A few months back he reminded the world of a short paper he’d written some years ago on the rather unexpected topic of interstellar finance. You can teleport a copy to your automated reading device by clicking here. [...]

Keep reading »

Which of the Basic Assumptions of Modern Physics are Wrong? Announcing the 4th Foundational Questions Institute Essay Contest

FQXI logo

There’s something unnerving about unifying physics. The two theories that need to be unified, quantum field theory and Einstein’s general theory of relativity, are both highly successful. Both make predictions good to as many decimal places as experimentalists can manage. Both are grounded in compelling principles. Both do have flaws — including an unfortunate tendency to [...]

Keep reading »

Quantum free fall: Experimenters drop a Bose-Einstein condensate down a 40-story shaft

ZARM drop tower, Bremen, Germany

Call it Einstein meets Einstein. A new experiment using a form of matter Albert Einstein predicted to exist might someday pave the way for fine-scale tests of general relativity, the famed physicist’s phenomenally successful theory of gravitation. In a paper in the June 18 issue of Science, a group of European researchers reports creating a [...]

Keep reading »
Roots of Unity

Time in 298 Words

Last year, in the inaugural Flame Challenge, Alan Alda and the Center for Communicating Science at Stony Brook University challenged scientists to explain what a flame is to an 11-year-old. This year, the subject was time. In particular, we were instructed to “Answer the question — ‘What is time?’ — in a way an 11-year-old [...]

Keep reading »

More from Scientific American

Email this Article