Follow this blog on Twitter

Recent Posts
 Guest Post: Chip Sebens on the ManyInteractingWorlds Approach to Quantum Mechanics
 Slow Life
 Where Have We Tested Gravity?
 Einstein’s Papers Online
 Thanksgiving
 Guest Post by Alessandra Buonanno: Nobel Laureates Call for Release of Iranian Student Omid Kokabee
 Unsolicited Advice: Becoming a Science Communicator
 Discovering Tesseracts
Recent Comments
 Hilbert: It seems as though Sean is no longer interested in practicing science. See his...
 Tin Man: ok, so every particle gets 3 dimensions in config space– what about...
 John Barrett: God plays dice with the universe! I have always been a dreamer, and those...
 John Barrett: @JohnD What a coincidence, then you would have to take the inverse of...
 John Call: Jared, Yes, I see. That makes a lot of sense. I feel that we may need to...
 Walker Guthrie: Can anyone help me with researching an effect that I observed many...
Archives
Categories
@seanmcarroll on Twitter
My TweetsBuy stuff!
The Particle at the End of the Universe: How the Hunt for the Higgs Boson Leads Us to the Edge of a New World From Eternity to Here: The Quest for the Ultimate Theory of Time Spacetime and Geometry: An Introduction to General Relativity Mysteries of Modern Physics  Time (The Great Courses) Dark Matter and Dark Energy (The Great Courses) Meta
Monthly Archives: March 2014
Guest Post: Jaroslav Trnka on the Amplituhedron
Usually, technical advances in mathematical physics don’t generate a lot of news buzz. But last year a story in Quanta proved to be an exception. It relayed the news of an intriguing new way to think about quantum field theory … Continue reading
Posted in Guest Post, Science
26 Comments
Naturalness in the NYT
In the wake of the announcement of gravitationalwave signatures from inflation in the cosmic microwave background, I was invited to contribute a piece to The Stone section of the New York Times, on “naturalness” and how it’s used in physics. … Continue reading
Posted in Science
30 Comments
A Great Time for Reason and Science
Here I am at an extremely stimulating meeting on gravity and quantum spacetime in Santa Barbara, but I skipped yesterday’s afternoon session to talk on the PBS News Hour about the new inflation results: There’s a great parallel (if the … Continue reading
Posted in Science
53 Comments
BICEP2 Updates
Here are the main results on gravitational waves/Bmodes from the CMB, as reported by the BICEP2 experiment. For background see my previous post. All of the BICEP2 results and plots are here. First, the best fit to r, the ratio … Continue reading
Posted in Science
56 Comments
Gravitational Waves in the Cosmic Microwave Background
Major announcement coming! [Update: Of course by now the announcement has come, of the discovery of signatures of gravitational waves in the cosmic microwave background by the BICEP2 experiment, more or less as the post below surmised. This followup post … Continue reading
Posted in Science
109 Comments
Einstein and Pi
Each year, the 14th of March is celebrated by scientificallyminded folks for two good reasons. First, it’s Einstein’s birthday (happy 135th, Albert!). Second, it’s Pi Day, because 3/14 is the closest calendrical approximation we have to the decimal expansion of … Continue reading
Posted in Humor, Science
53 Comments
A Bit of Physics History: Ed Witten Introduces MTheory
The Second Superstring Revolution was, like most revolutions, a somewhat messy affair, with a number of pivotal steps along the way: understanding the role of membranes in 11dimensional supergravity, the discovery of dualities in supersymmetric gauge theories, Polchinski’s appreciation of … Continue reading
Posted in arxiv, Science
15 Comments
Guest Post: Katherine Freese on Dark Matter Developments
The hunt for dark matter has been heating up once again, driven (as usual) by tantalizing experimental hints. This time the hints are coming mainly from outer space rather than underground laboratories, which makes them harder to check independently, but … Continue reading
Posted in Guest Post, Science
23 Comments
Effective Field Theory and LargeScale Structure
Been falling behind on my favorite thing to do on the blog: post summaries of my own research papers. Back in October I submitted a paper with two Caltech colleagues, postdoc Stefan Leichenauer and grad student Jason Pollack, on the … Continue reading
Posted in arxiv, Science
8 Comments
Decennial
Almost forgot again — the leapyear thing always gets me. But I’ve now officially been blogging for ten years. Over 2,000 posts, generating over 57,000 comments. I don’t have accurate stats because I’ve moved around a bit, but on the … Continue reading
Posted in Blog, Personal
12 Comments