Neutrinos: "shielding? awww, that's cute"
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"election" :)

title: Lagrangian Mechanics and a representation of L=K-U asking for the reason of the minus sign

new video: "Lagrangian Mechanics: when theoretical physics got real." In addition to some history, I take Newtonian mechanics and derive Hamilton’s principle, revealing how the mysterious quantity K-U naturally appears, answering the common question "why is L=K-U?" youtu.be/QbnkIdw0HJQ 🧪⚛️🔭 #chemsky

oh yeah, some lazy versions of the story simply claim that Taylor just assumed this constant to be 1, which I even find offensive when you see all the work behind that calculation

he was also known as "the Italian navigator that landed in the new world" when the Chicago Pile reached criticality

Size of a nuclear blast YouTube video by Dr. Jorge S. Diaz

an important question is: where does the value on the rhs of eq. (1) comes from? Some versions of the story claim that he guessed it or that he calibrated it from small explosions, the truth is that most of his paper is about calculating this number. I made a video about this youtu.be/8ru_LpjuabY

representation of the energy fluctuations of light being describe by a wave and particle component

Sep. 21, 1909: Einstein presents at the Salzburg conference his discovery that Planck's radiation law hides a quantum Easter egg: the wave-particle duality of light. Details in "This is how the wave-particle duality of light was discovered" youtu.be/f7JvywBOGYY 🧪⚛️🔭 #chemsky

enjoy beautiful Heidelberg, despite the clouds and windy start of the week. We save the sun for the last part of the week, enjoy!

thanks for clarifying your point, I get it now, I misunderstood it.

I strongly disagree with the "we should do everything we can to keep them around," what if the person doesn't want to "be kept around"? maybe the person wants stability, mental health, a life... the "we should do everything we can to keep them around" sounds like focusing the PI's viewpoint only.

This is how Heisenberg created quantum mechanics - a step-by-step guide #SoME4 YouTube video by Dr. Jorge S. Diaz

new video: "This is how Heisenberg created quantum mechanics." A step-by-step guide to understand Heisenberg's groundbreaking but cryptic paper of quantum mechanics.🧪⚛️🔭 #chemsky #QuantumPhysics youtu.be/oVzzIkkYGY8

sí, claro, Luis Huerta era el nombre que todos escuchábamos. Buenos tiempos.

qué buenos recuerdos me traes, Martín. Muy bien la pasé en las Olimpiadas de Física en Chile, hice buenos amigos y volví a casa con medallas tres años consecutivos

when I was an undergraduate student, I was convinced that "Bremsstrahlung" was the last name of some German physicist named Wilhelm Bremsstrahlung, or something like that. Just like "Gauge invariance" was obviously named after some French physicist named François Gauge.

The origin of a bizarre quantum phenomenon YouTube video by Dr. Jorge S. Diaz

new video: "The origin of a bizarre quantum phenomenon." The story of a wrong theory and a wrong plot that gave rise to a weird the concept of zero-point energy. Part 6 of my series on the road to Heisenberg's matrix formulation of quantum mechanics.🧪⚛️🔭 #chemsky #QuantumPhysics youtu.be/DgrOm5nsm98

The quantum theory created to eliminate the photon YouTube video by Dr. Jorge S. Diaz

new video: "The quantum theory created to eliminate the photon," part 5 of my series on the road to Heisenberg's matrix formulation of quantum mechanics presents Bohr's last attempt to vanquish Einstein's light quanta 🧪⚛️🔭 #chemsky #QuantumPhysics youtu.be/Jcv90l9R728

Some people find meaning in relationships between fundamental numbers, I find it useless but amusing. Here is one that I found many years ago: the abundance of U-235 in natural uranium (0.72%) is equal to the approximate value of the fine-structure constant (1/137)

how can the News and Views of an open access paper be behind paywall?! #sigh

qué recuerdos me trajiste @fisicamartin.bsky.social con tu referencia a Hess, hace años escribí este artículo contando su historia conexioncausal.wordpress.com/2015/12/12/m...

The virtual orchestra of quantum mechanics YouTube video by Dr. Jorge S. Diaz

new video: "The virtual orchestra of quantum mechanics," part 4 of my series on the road to Heisenberg's matrix formulation of quantum mechanics 🧪⚛️🔭 #chemsky #QuantumPhysics youtu.be/UbFrVCYDANg

The lesser-known link between Bohr and Heisenberg YouTube video by Dr. Jorge S. Diaz

new video: "The lesser-known link between Bohr and Heisenberg," part 3 of my series on the road to Heisenberg's matrix formulation of quantum mechanics 🧪⚛️ #chemsky #IYQ2025 youtu.be/9hfQZMBQOiw

Pink Floyd and the roots of Quantum Mechanics YouTube video by Dr. Jorge S. Diaz

new video: "Pink Floyd and the roots of Quantum Mechanics," part 2 of my series on the road to Heisenberg's matrix formulation of quantum mechanics 🧪⚛️ #chemsky youtu.be/HC0a33HnTuE

the dark oval is the region of low light intensity and the bright ring around is the convergence of light rays refracted away from the center. I think it is the static version of dark and bright zones at the bottom of a pool. I am not an optics expert, this is just how I interpret this phenomenon.

I love those shadows, my guess is that this is a mixture of surface tension and Snell's law: the bug deforms the water surface tilting the normal towards the bug's leg producing an effective "diverging lens" so light rays are refracted away from where they would have landed in the absence of the bug

Matrix Mechanics: The Genesis YouTube video by Dr. Jorge S. Diaz

new video: Einstein's groundbreaking work on radiation that set the basis of the laser and paved the way to Heisenberg's Matrix Mechanics 🧪⚛️ #chemsky youtu.be/_lC6-RUI7PQ

dogo looks like that classic 1927-portrait of Werner Heisenberg with that hat repository.aip.org/werner-heise...

Quantum wave equation before Schrödinger YouTube video by Dr. Jorge S. Diaz

new video: Louis de Broglie is well known for proposing matter waves; however, less known is that he also found the first quantum wave equation. An improved version of this equation was later rediscovered by Schrödinger, Klein, and Gordon🧪⚛️ #chemsky youtu.be/cPpfAyfdWTI

Pilot-wave theory (part 3): unifying waves and particles YouTube video by Dr. Jorge S. Diaz

new video: part 3 of de Broglie's unification of wave and particles, now showing that Fermat's principle of ray optics is equivalent to Maupertuis' principle for the dynamics of particles as well as the prediction that gave him the 1929 Nobel Prize in Physics🧪⚛️ #chemsky youtu.be/2z8D-NqnBk4

that is what the student deserves for calling the Dirac delta a "function" instead of a distribution

thanks for sharing, I didn't know about this network, and I will definitely check these lectures