lagrange137.bsky.social - Profile | ThreadSky | a Reddit-style client for Bluesky

¿Qué es el momento magnético de las partículas y por qué es anómalo?🧐 Esta predicción del modelo estándar es la más precisa de toda la ciencia🥇 y es el culmen de todo el conocimiento sobre física de partículas 🤯 Dentro hilo🧵🧵👇🏻👇🏻

submitted 3 days ago • 1 comment

HISTORY OF PHYSICS This is a conversation, told by a witness to Subrahmanyan Chandrasekhar, between Ettore Majorana and Enrico Fermi in the mid-1920s when both were also in their middle twenties: Majorana: There are scientists who "happen" only once in every 500 years, like Archimedes or Newton.

submitted 8 days ago • 1 comment

HISTORY OF PHYSICS The Story of the S-Matrix Shortly after the development of quantum mechanics, Dirac, Heisenberg, Pauli, as well as Jordan, Klein and Wigner had shown that relativistic, non-interacting wave fields could be consistently quantized. 1/

submitted 13 days ago • 2 comments

[Open Access][SCOAP3 for Books] Introduction to General Relativity, Black Holes and Cosmology Yvonne Choquet-Bruhat 🧪⚛️ 1 - library.oapen.org/handle/20.50... 2 - inspirehep.net/files/b6b9e2...

submitted 16 days ago • 0 comments

Following up my rainbow thread yesterday, I generalized raytracing to the tertiary bow and indeed you can see it clearly on a semi-transparent screen placed behind the glass sphere (i.e. in the same direction as the incident rays). The vertical metal post in the photo blocks the focussed light.

submitted 17 days ago • 1 comment

Preparing my 2025 Day of Light outreach lectures, I bought a glass sphere and made a rainbow. But I saw some odd things, and so here’s a thread with some photos and raytracing pictures. There may well be mistakes so tell me and I'll fix them. First the basic setup showing the primary bow.

submitted 19 days ago • 1 comment

New video! Terence Tao on how we measure the cosmos: youtu.be/YdOXS_9_P4U

submitted 20 days ago • 23 comments

HISTORY OF PHYSICS The story of the spin Wolfgang Pauli wrote a letter to Alfred Landé where he expressed his views concerning the exclusion principle; it was a preview of an article he was preparing. Pauli's letter arrived at the same moment as Ralph Kronig 1/ (Photo: Niels Bohr Archive)

submitted 27 days ago • 1 comment

[Coming soon][2025] [David Tong books] Lectures on Theoretical Physics 1 - Classical Mechanics www.cambridge.org/highereducat... 2 - Electromagnetism www.cambridge.org/highereducat... 3 - Quantum Mechanics www.cambridge.org/highereducat... 4 - Fluid Mechanics www.cambridge.org/highereducat...

submitted 40 days ago • 1 comment

HISTORY OF PHYSICS An adventure: In a seminar with Murray Gell-Mann and Richard Feynman. (As told by Lars Brink) The seminar room has a huge table in the middle and the senior people were sitting along it and we juniors along the walls. Feynman had a given seat — the first in the row next 1/

submitted 45 days ago • 1 comment

Esta es una pregunta interesante que me hicieron en X sobre la que me parecía que vale la pena comentar. Normalmente no somos conscientes de lo vacío que está el espacio interestelar así que puede ser ilustrativo. Sobre la marcha di una respuesta rápida sin hacer > x.com/MartaSanMart...

submitted 53 days ago • 1 comment

I am reading Steven Weinberg’s autobiography. www.cambridge.org/core/books/s...

submitted 62 days ago • 1 comment

Nuestra idea sobre "el vacío" ha cambiado mucho en las últimas décadas. De hecho, tal y como hoy lo entendemos, EL VACÍO ESTÁ LLENO. Pero ¿lleno de qué? ¿Qué es el vacío? ¿Cómo surge la Radiación de Hawking en agujeros negros? ¿QUÉ ES LA NADA? ¡Vamos con un profundo HILO!

submitted 70 days ago • 2 comments

Could we tell whether anyone in our galaxy uses a warp drive? This sounds like a crazy question, but it can be answered using numerical GR (one of the fun highlights of the annual theory meeting presented by Katy Clough) 🧵1/7

submitted 71 days ago • 15 comments

HISTORY OF PHYSICS The story of the phonon. The closeness of Igor Tamm to Leonid Mandelstam, to his almost contemporary Grigory Landsberg and his younger friend Mikhail Leontovich directly influenced the choice of the topic of the first work on quantum mechanics. 1/

submitted 72 days ago • 1 comment

¿Por qué aparecen burbujas en el champán? 🥂 ¿En qué se asemejan a las nubes? ☁️ Dentro 🧵

submitted 78 days ago • 1 comment

Imagina que viajas a Luna y, a tu regreso, te dejas el móvil allá 🤦‍♂️. Pues mientras le dure la batería (y visto desde la Tierra), tu móvil rivalizará en brillo con las radiofuentes más bestias del cielo, incluidos los agujeros negros supermasivos. ¿Hacemos un mini-hilo? ¡Venga!

submitted 78 days ago • 1 comment

[Book][Open Access] Non-Perturbative Field Theory From Two-Dimensional Conformal Field Theory to QCD in Four Dimensions Yitzhak Frishman, Jacob Sonnenschein Cambridge University Press, 2023 www.cambridge.org/core/books/n...

submitted 79 days ago • 0 comments

Bueno. Como he llegado a los 8.000 seguidores (en Twitter jejeje), aquí tenéis el hilo prometido (en Twitter también jejeje), relacionado con el tema del momento: 𝗧𝗢𝗣𝟮𝟬 𝗠𝗶𝘁𝗼𝘀 𝗵𝗮𝗯𝗶𝘁𝘂𝗮𝗹𝗲𝘀 𝗿𝗲𝘀𝗽𝗲𝗰𝘁𝗼 𝗮 𝗹𝗮 𝗙𝗶𝗹𝗼𝘀𝗼𝗳𝗶́𝗮 𝗖𝗶𝗲𝗻𝘁𝗶́𝗳𝗶𝗰𝗮 De más tochos a más sutiles. ¡Pasen y vean! Y dadle amor eh 🤠👇 [0/20]

submitted 80 days ago • 4 comments

2-dimensional analogies are often used to motivate physical concepts in our 3+1 dimensional world. But a world with 2 space and 1 time dimensions would look very different from our world Some crucial differences:🧵 1/10

submitted 83 days ago • 5 comments

Esta biografía de Paul Dirac es todo lo que tiene que ser una biografía: personaje, contexto histórico, contexto científico (con un toque de divulgación) e incontables crossovers. Si no me creéis, fijaos en el número de post-it con los que ha acabado. ♥️

submitted 84 days ago • 2 comments

CALENDARIO DE ADVIENTO DE NOCIONES Y RESULTADOS DE MATEMÁTICAS Un concepto, teorema o idea matemática al día hasta el 25 de diciembre. Cada entrada citada con un hilo de explicación

submitted 89 days ago • 1 comment

A short comic about Lenny (1/2) #TheSimpsons #comics

submitted 518 days ago • 20 comments

HISTORY OF PHYSICS About spacetime. Time as a coordinate. In September 21, 1908 Hermann Minkowski gave a seminar where he presented his ideas about how space and time must be considered together in a unique entity, the spacetime. "Dear Sirs! The ideas about space and time that 1/

submitted 91 days ago • 2 comments

Profe... ¿Cuántos decimales pongo? Hay quien erróneamente les responde "pon tres decimales" 🤷🏻 El resultado debe expresarse con tantas cifras significativas como el que menos tenga de los datos de entrada. Un ejemplo: ¿A qué velocidad constante se recorren 77,64 m en 3,9 s ?👇

submitted 97 days ago • 2 comments

HISTORY OF PHYSICS This story was told by Yuri Rumer, soviet physicist. The Russian physicist Gamow was also quite a peculiar character. He spoke in such broken German that it was dubbed "Gamov-Deutsch." He was great at drawing Mickey Mouse-like sketches, had a sharp wit, 1/

submitted 94 days ago • 1 comment

Since I am new here, I thought I would continue my tradition of sharing pedagogical review articles about important topics in theoretical physics & Cosmology. I begin with this excellent review of Cosmological Constant by Jerome Martin, I have personally found illuminating. arxiv.org/abs/1205.3365

submitted 96 days ago • 4 comments

Technical 🧵on ghosts (states with negative norm) States with a negative norm are unphysical in quantum field theories. If you have a kinetic term with a negative sign it gives rise to the following commutation relation 1/9

submitted 97 days ago • 7 comments

HISTORY OF PHYSICS Paul Dirac about the role of fear in science. The research worker is only human and, if he has great hopes, he also has great fears. (I do not suppose one can ever have great hopes without their being combined with great fears.) As a result, his course 1/

submitted 97 days ago • 1 comment

Particle physicists describe the world using their Standard Model's equations. How did they become so confident that these math formulas, easily summarized on a coffee cup, describe so much of nature? Here's the story of the Z boson and its magic angle: profmattstrassler.com/2024/11/20/c...

submitted 100 days ago • 4 comments