Guen Prawiroatmodjo @guenp@physics.social

New on this instance of Mastodon and a retired physicist happy to join this community!

A wonderful performance of Canto Ostinato, a superb 1976 work by Dutch composer Simeon ten Holt: https://vimeo.com/31357966

Learned about it via @guenp

From Wikipedia:

"The most remarkable aspect about this work is the amount of freedom that is given to the performer(s). The piece can be performed with different instruments and a different number of performers."

It's composed of 106 sections which can be repeated as wished: "Performance may take from some two hours to more than a day."

🤘 🎶

Realised I never got round to writing an #introduction.

Hi, I'm Cas! I'm a PhD student working on Topological Solitons, currently vortices in Yang-Mills-Higgs theory.

In my spare time I enjoy watching films and anime, walking, and reading.

Actually this paper isn't about QEC. But it reminds me of the repetition code in some ways, which is what caught my eye.

https://arxiv.org/abs/2211.11729

There's a thread on it by @MarisOzols here
https://mastodon.online/@MarisOzols@mathstodon.xyz/109386508264751463
(though if you are on the app, you'd probably be better off clicking the handle rather than the link).

#qec #quantum

*PRO NERD TIP*

Today I learned about "The Wikipedia Library Card". If you've been a WP editor for >6 months, have made >500 edits, at least 10 edits in the last month, and are not blocked for being a jerk, you can access a *ton* of paywalled content for free.

ScienceDirect, AAAS, The BMJ, both APAs, EBSCO, Springer, Nature, Wiley, and many more.

https://wikipedialibrary.wmflabs.org/about/

All those hours in 2005 spent editing sci-fi book articles finally paying off!

🚨 BIG EXOPLANET NEWS! 🚨

Our team has released FIVE papers today on the most COMPREHENSIVE study of an #exoplanet atmosphere to date!

Using #JWST we obtained four transit observations of #WASP39b early in the telescope's operations to study both the planet itself, and the telescope's capabilities to observe exoplanet atmospheres.

We detected numerous molecules in the planet's atmosphere, including CO2, CO, H2O, and SO2 🧵

The future is here! ⭐ 🪐 🔭 #Astrodon #Science

https://webbtelescope.org/contents/news-releases/2022/news-2022-060

I came across this nice integerological fact:

Define \(\operatorname{ord}_p(n)\) to be the power of \(p\) in the prime factorisation of \(n\).

Then

\[ \sum_{k=1}^n\gcd(n,k) = \prod_{p|n} \left(1+\left(1-\frac{1}{p}\right) \cdot \operatorname{ord}_p(n)\right) \]

I don't know why you'd want to do this, and all the references I've found to it talk about it as a special case of some more general identities, but for some reason it appealed to me.

I'm a graduate student in physics. My recent effort is on understanding the solutions of \(\partial_t^2 \psi - \nabla^2\psi + \psi(\psi\psi^* - \psi_0(t)\psi_0^*(t))=0\). But of course I'm open to be distracted by other good maths. #introduction

My favorite thing about Mastodon so far is that all of a sudden I have posts about history, archaeology, astrophysics etc in my timeline because even though I follow mostly the same people here as tweeter everyone branched out once they got here and started boosting cool people they ran into here.