Thursday, October 18, 2018

The Electron Remains Perfectly Point-Like

The latest and most accurate experiment to detect any hint of an electric dipole moment of an electron has revealed that there isn't any.

Now, the Advanced Cold Molecule Electron Electric Dipole Moment, or ACME, search, based at Harvard University, has probed the electron’s EDM with the most precision ever — and still found no sign of smooshing, the team reports online October 17 in Nature.

The finding improves the team’s last best measurement (SN Online: 12/19/13) by a factor of 10 to find an EDM of 10-29 electron charge centimeters. That’s as round as if the electron were a sphere the size of the Earth, and you shaved less than two nanometers off the North Pole and pasted it onto the South Pole, says Yale University physicist David DeMille, a member of the ACME team.


This improves upon the previous measurement that I mentioned a year ago. Looks like if any theory predicts the possible structure of an electron, they have some severe constraints to overcome.

Zz.

Friday, October 12, 2018

Time Crystals

Ignoring the theatrics, Don Lincoln's video is the simplest level of explanation that you can ask for for what a "time crystal" is, after you strip away the hyperbole.



Zz.

Friday, October 05, 2018

RIP Leon Lederman

One of the most charismatic physicists that I've ever met, former Fermilab Director and Nobel Laureate Leon Lederman, has passed away at the age of 96. Most of the general public will probably not know his name, but will have heard the name "God Particle", which he coined in his book, and which he originally intended to call the "God-Damn Particle".

He had been in failing health, and suffered from dementia. It force his family to auction off his Nobel Prize medal to help with his medical cost. But his lasting legacy will be in his effort to put "Physics First" in elementary and high school. And of course, there's Fermilab.

He truly was, and still is, a giant in this field.

Zz.

Tuesday, October 02, 2018

2018 Nobel Prize in Physics ... FINALLY, after 55 years!

I seriously thought that I'd never see this in my lifetime, and I'm terribly happy that I was wrong!

The 2018 Nobel Prize in Physics has just been announced, and for the first time in more than 50 years, one of the winners is a woman!

The Nobel Prize in Physics 2018 was awarded “for groundbreaking inventions in the field of laser physics” with one half to Arthur Ashkin “for the optical tweezers and their application to biological systems”, the other half jointly to GĂ©rard Mourou and Donna Strickland “for their method of generating high-intensity, ultra-short optical pulses”.

Congratulations to all, and especially to Donna Strickland.

I will admit that this wasn't something I expected. I didn't realize that the area of ultra-short laser pulses was in the Nobel Committee and nomination radar. But it is still very nice that this area of laser pulse-shaping technique is being recognized.

Zz.