Purple line train tracks

Purple line looking good in College Park! Catenary lines up and everything #purplelinemd

Thank you @jackiebensen4.bsky.social @nbcwashington.com for this outstanding, and heartbreaking, story about deadly road design in Montgomery County MD.

www.nbcwashington.com/news/local/m...

40 or more is 65+ down a neighborhood street. That should be a felony, not half the price of an iPhone.

Orlando’s Marta is better 🤷

Oh hi marc

Happy #biketoworkday! Next stop, College Park!

Thanks for your interest!

I do see this as a new extension to nonlinear dynamics work. Of course synchronization and chaos have been around for decades but to construct a robust phase of matter is new and requires new techniques, specifically w.r.t. breaking discrete time translation symmetry. However the foundation is old.

Time Crystal Research Enters a New Phase | Joint Quantum Institute JQI researchers identified a set of promising ingredients for making time crystals. With those ingredients in mind, they developed a new theoretical framework that they hope will put time crystals res...

A recent article about my time-crystal research!

I think I trust the guy with 10 Grammy nominations and 5 number 1 Billboard hits on questions of rhythm. Nice to know La Flame is an OEIS user

Traffic signal which says “Train Coming”

A subtle sign that #purplelinemd is coming soon!

Me in front of the APS sign

At #APSGlobalSummit2025!

Steel girders on March 10-13 apparently!

New roof structure on a flatbed truck

New beams crossing from metro platform to new mezzanine.

New roof pieces and beams in #SilverSpring! #purplelinemd #wmata

Metal frames placed on mezzanine, resembling elevator shafts

I think you’re right!

Integer Quantum Hall Effect: Disorder, temperature, floating, and plateau width We theoretically consider disorder and temperature effects on the integer quantum Hall effect (IQHE) using a variety of distinct and complementary analytical and numerical techniques. In particular, w...

If you thought the Integer Quantum Hall Effect was fully understood, think again! We show how temperature and disorder destroy IQHE without affecting the topologically-protected plateau height
arxiv.org/abs/2501.08273

My #metrorewind! Red line summer shutdown skewed my results a tad

New catenary poles at UMD! It’s getting real! #purplelinemd

Published my first Physical Review Letter today on the first construction of a robust time crystal in a classical, dissipative system! ⏰💎 #timecrystals

Rails over Northwest branch

Rails over sligo creek

Exciting to see rails over Sligo Creek and Northwest Branch! #purplelindmd

And it will be even better with Purple Line, CCT, MBT, new Metro Entrance and Fenton St bike lanes! Waiting is hard

#sufjan is number one for another year!

North tower of the Silver Spring mezzanine is poured and ready! #purplelinemd

On a related note, I’ve begun to say “coolness” instead of inverse temperature 😎

This means if all the data in the world (≈175 ZB) instead stored the atomic information of a piece of ice, the internal energy would be less than the energy of a lettuce leaf.

Since temperature is a measure of energy per information, we can say that water freezes at approximately 5 dietary calories per yottabyte.

New #purplelinemd rails on Campus Dr at University