Experiment
Category archives for Experiment
A Confusing Light OPERA: How Does a Loose Fiber Optic Cable Cause a Signal Delay?
Posted by Chad Orzel on April 2, 2012 So, the infamous OPERA result for neutrino speeds seems to be conclusively disproven, traced to a problem with a timing signal. Matt Strassler has a very nice explanation of the test that shows that the whole thing can almost certainly be traced to a timing error that cropped up in 2008. This problem is generally…
Treating Big Molecules Like Electrons: “Real-time single-molecule imaging of quantum interference”
Posted by Chad Orzel on March 26, 2012 Richard Feyman famously once said that the double-slit experiment done with electrons contains everything that’s “‘at the heart of quantum physics.” It shows both particle and wave character very clearly: the individual electrons are detected one at a time, like particles, but the result of a huge number of detections clearly traces out an interference…
Neutrinos in the News
Posted by Chad Orzel on March 16, 2012 A little more tab clearance, here, this time a few recent stories dealing with those elusive little buggers, neutrinos. In roughly chronological order:< /p> The Daya Bay experiment in China has measured a key parameter for neutrino oscillation (arxiv paper), the phenomenon where neutrinos of one of the three observed types slowly evolve into one…
Experimental Particle Physics: Still Really Difficult
Posted by Chad Orzel on March 7, 2012 So, the news of the moment in high-energy physics is the latest results being reported from a conference in Europe. The major experimental collaborations are presenting their newest analyses, sifting through terabyte-size haystacks of data looking for the metaphorical needle that is the Higgs boson. And what are those results? It sort of depends on…
On Neutrinos and Cables
Posted by Chad Orzel on February 24, 2012 It’s not a good week for me to be writing about anything remotely controversial, but if I want to keep my physics blogging license, I need to say something about the latest fast neutrino news. This has followed the usual trajectory of such stories, with the bonus farcical element of people who blasted the media…
Most Difficult Course?
Posted by Chad Orzel on February 16, 2012 Regular reader Johan Larson sends in a good question about academic physics: You have written about teaching various courses in modern physics, a subject that has a fearsome reputation among students for skull-busting difficulty. That suggests a broader question: what is the most difficult course at your university? Or even more broadly, how would one…
Course Report: A Brief History of Timekeeping 03
Posted by Chad Orzel on February 3, 2012 It’s been a little while since I wrote up what I’ve been doing in my “Brief History of Timekeeping” class, because I was out of town, and then catching up from being out of town. Some of this material has already appeared here, though, so I can hopefully catch up a lot of stuff in…
Experiment vs. Theory: Where Did It All Go Wrong?
Posted by Chad Orzel on December 20, 2011 Over at Backreaction, Bee is running an advent calendar of her own, with amusing anecdotes about famous physicists. Apparently, it’s a good year for advent calendars. A couple of days ago, her story was a famous one about Heisenberg nearly failing to get his Ph.D. because he disdained experiment: Wien wanted to fail Heisenberg, but…
The Top Physics Breakthroughs of 2011
Posted by Chad Orzel on December 16, 2011 Physics World has released its list of the top ten breakthroughs in physics for the year, and it doesn’t include either fast neutrinos or the Higgs boson: The two physics stories that dominated the news in 2011 were questions rather than solid scientific results, namely “Do neutrinos travel faster than light?” and “Has the Higgs…
Mandatory Higgs Boson Post
Posted by Chad Orzel on December 13, 2011 I was planning to let today’s Higgs press conference pass with only a few oblique mentions in posts about other things, but apparently, I would lose my license to blog about physics if I did that. You’d think that, being married to a lawyer, and all, I’d know to read the fine print in these…
