I derived Planck mass from sphere packing – 0.574 ppm, zero free param

https://zenodo.org/records/18089296

#HackerNews #PlanckMass #SpherePacking #Physics #Research #ScienceInnovation

Feynman's Hughes Lectures: 950 pages of notes

https://thehugheslectures.info/the-lectures/

#HackerNews #Feynman #Hughes #Lectures #FeynmanNotes #Physics #Education #Science #History

#introduction I am new here. My brother @jaforbes tells me it is customary to do an opening post of things I find interesting or likely to discuss in the future. Here is my list: #democracy #ai #eng #engineering #osint #geopol #math #mathematics #humanrights #compsci #history #philosophy #space #australia #japan #bluemountains #science #tech #anu #unsw #uts #physics #uai #agi #nafo #peace #ukraine #taiwan #photography #tdd #andor. I have friends everywhere. I hope that you'll join me.

#introduction I am new here. My brother @jaforbes tells me it is customary to do an opening post of things I find interesting or likely to discuss in the future. Here is my list: #democracy #ai #eng #engineering #osint #geopol #math #mathematics #humanrights #compsci #history #philosophy #space #australia #japan #bluemountains #science #tech #anu #unsw #uts #physics #uai #agi #nafo #peace #ukraine #taiwan #photography #tdd #andor. I have friends everywhere. I hope that you'll join me.

Electron orbitals explained and visualized. Starts from 1d waves. No need to know chemistry.

Electrons Don't Actually Orbit Like This
https://www.youtube.com/watch?v=6tZXSl1dL5A

#chemistry #physics #visualization #educational

Electron orbitals explained and visualized. Starts from 1d waves. No need to know chemistry.

Electrons Don't Actually Orbit Like This
https://www.youtube.com/watch?v=6tZXSl1dL5A

#chemistry #physics #visualization #educational

Potential #Mechanics nerd-snipe:

It seems that nobody on the Web has taken a deep approach to answering the eminently important question(s) of:

Are ruined buildings leaning against each other as commonly depicted in post-apocalyptic fiction structurally feasible? Under which construction methods? Etc.

The easier form of the question is to consider only statics, i.e. neglecting impact forces during collapse and just seeing if the actual load-bearing could check out.

I see a lot of *speculation* about this on the Web, but the kind of detail I'm interested in is much more along the lines of Torus Earth:

https://www.aleph.se/andart/archives/2014/02/torusearth.html

#MechanicalEngineering #Physics

Potential #Mechanics nerd-snipe:

It seems that nobody on the Web has taken a deep approach to answering the eminently important question(s) of:

Are ruined buildings leaning against each other as commonly depicted in post-apocalyptic fiction structurally feasible? Under which construction methods? Etc.

The easier form of the question is to consider only statics, i.e. neglecting impact forces during collapse and just seeing if the actual load-bearing could check out.

I see a lot of *speculation* about this on the Web, but the kind of detail I'm interested in is much more along the lines of Torus Earth:

https://www.aleph.se/andart/archives/2014/02/torusearth.html

#MechanicalEngineering #Physics

While historically she was merely remembered as Voltaire’s lover, she in fact was not only responsible for all his ideas about #physics but was the first to postulate the conservation of total energy (which includes kinetic and other forms of energy combined). Further, she found the relationship between kinetic energy, mass and velocity of an object. She combined Newton’s text with Leibniz’ more elegant formulation of calculus, pushing physics forward.⠀

🧵2/2

🪐‘My main motivation is that I want to find out how life could have arisen at Earth.’

Planetary scientist at the UG Tim Lichtenberg recently found an unexpected atmosphere, while his colleague Quentin Changeat studies that of a rocky 'lava planet'.🔥

🌍 What can we learn from exoplanets?

Curious? Read more 👇
🔗https://www.rug.nl/fse/news/matter-and-space/stormy-planets-and-an-unexpected-atmosphere

🧪 #SciComm #astronomy #JamesWebbspacetelescope #astrophysics #physics #extraterrestrial #ET #exoplanets #research #scientistsOnMastodon @universityofgroningen

New video by braintruffle (Torsten Heinze), showing why swapping two lines of code vastly improves numerical stability.

https://youtu.be/nCg3aXn5F3M

#simulation #physics #marhs

X-mas comes early this year: the ICFP 2025 talks are now on YouTube.

You can catch my talk on "Domain-specific tensor languages" below. We explore implementing tensor calculus in #Haskell, supporting both Einstein notation and Penrose diagrams to model things like General Relativity and black holes. 🕳️🚀

My talk: https://www.youtube.com/watch?v=04cxfddDwuI

Full Playlists:
🔗 ICFP papers: https://www.youtube.com/watch?v=COD4tnVtHoQ&list=PLyrlk8Xaylp4WyLpPH40RBw-kZSdkpkVs
🔗 JFP First papers: https://www.youtube.com/watch?v=oZLSDFfpHp0&list=PLyrlk8Xaylp68qJ-kEeXEPne0ePPwNGFi

https://mastodon.acm.org/@sigplanav/115667300324636252

cc @sigplanav (https://sigplan.org)

#icfpsplash25 #ProgLang #TensorCalculus #Physics #FunctionalProgramming

Simulated trajectories of ultra high energy protons with energies from 1e18 to 1e20 eV injected by galaxies at z=0.05 and propagating across the magnetised cosmic web.

(simulation with self-written code in Julia @julialang)

#astronomy #physics #science #SimulatedUniverses

Ça mousse donc ça lave ? 👉
https://culturesciencesphysique.ens-lyon.fr/ressource/Mousses_Drenkhan.xml
➡️
Les mousses à la croisée de la recherche scientifique et de la préservation des œuvres d'art : une illustration très esthétique et pour tout public ! Merci

L’une des meilleures conférences auxquelles j’ai assisté !
Des manips, un sujet de recherche suscité par une demande d’application, une chercheuse, Wiebke Drenkhan, enthousiaste et impliquée dans la vulgarisation auprès des + jeunes : à ne pas rater !

Merci à la plateforme CultureSciencesPhysique pour la mise en ligne.
#physics #education #chemistry

Supercollider ppl, do you know anyone (are you this person?) who has had success doing physical modelling in supercollider? Something like modulating something based on the height of a bouncing ball you’re simulating in real time (the thing I want to do is a lot more complicated but a similar shaped problem I hope). Thanks :))

#SuperCollider #sclang #livecoding #physics

While historically she was merely remembered as Voltaire’s lover, she in fact was not only responsible for all his ideas about #physics but was the first to postulate the conservation of total energy (which includes kinetic and other forms of energy combined). Further, she found the relationship between kinetic energy, mass and velocity of an object. She combined Newton’s text with Leibniz’ more elegant formulation of calculus, pushing physics forward.⠀

🧵2/2

Supercollider ppl, do you know anyone (are you this person?) who has had success doing physical modelling in supercollider? Something like modulating something based on the height of a bouncing ball you’re simulating in real time (the thing I want to do is a lot more complicated but a similar shaped problem I hope). Thanks :))

#SuperCollider #sclang #livecoding #physics

Ça mousse donc ça lave ? 👉
https://culturesciencesphysique.ens-lyon.fr/ressource/Mousses_Drenkhan.xml
➡️
Les mousses à la croisée de la recherche scientifique et de la préservation des œuvres d'art : une illustration très esthétique et pour tout public ! Merci

L’une des meilleures conférences auxquelles j’ai assisté !
Des manips, un sujet de recherche suscité par une demande d’application, une chercheuse, Wiebke Drenkhan, enthousiaste et impliquée dans la vulgarisation auprès des + jeunes : à ne pas rater !

Merci à la plateforme CultureSciencesPhysique pour la mise en ligne.
#physics #education #chemistry

🪐‘My main motivation is that I want to find out how life could have arisen at Earth.’

Planetary scientist at the UG Tim Lichtenberg recently found an unexpected atmosphere, while his colleague Quentin Changeat studies that of a rocky 'lava planet'.🔥

🌍 What can we learn from exoplanets?

Curious? Read more 👇
🔗https://www.rug.nl/fse/news/matter-and-space/stormy-planets-and-an-unexpected-atmosphere

🧪 #SciComm #astronomy #JamesWebbspacetelescope #astrophysics #physics #extraterrestrial #ET #exoplanets #research #scientistsOnMastodon @universityofgroningen

2023 November 17

Nightlights in Qeqertaq
* Image Credit & Copyright: Dennis Lehtonen
https://denniina.com/

Explanation:
Light pollution is usually not a problem in Qeqertaq. In western Greenland the remote coastal village boasted a population of 114 in 2020. Lights still shine in its dark skies though. During planet Earth's recent intense geomagnetic storm, on November 6 these beautiful curtains of aurora borealis fell over the arctic realm. On the eve of the coming weeks of polar night at 70 degrees north latitude, the inspiring display of northern lights is reflected in the waters of Disko Bay. In this view from the isolated settlement a lone iceberg is illuminated by shore lights as it drifts across the icy sea.
https://denniina.com/gallery/23-24
https://www.instagram.com/p/CzVRGZlMyu_/
https://www.timeanddate.com/astronomy/polar-night.html
https://science.nasa.gov/earth/earth-observatory/thinning-of-the-northeast-greenland-ice-stream-150801/

https://apod.nasa.gov/apod/fap/ap251212.html

#space #earth #aurora #astrophotography #photography #NASA #science #physics #nature #education #4sAur