Schwinger
@lagrange137.bsky.social
Vanitas vanitatum et omnia vanitas
Reposted by Schwinger
HISTORY OF PHYSICS
Unifying Hadrons with SU(3) Symmetry: On the discovery of the SU(3) Gell-Mann–Okubo mass formula
Early in the 20th century, the recognized elementary particles were the electron, proton, and neutron, along with the neutrino. After the discovery of mesons
1/
Unifying Hadrons with SU(3) Symmetry: On the discovery of the SU(3) Gell-Mann–Okubo mass formula
Early in the 20th century, the recognized elementary particles were the electron, proton, and neutron, along with the neutrino. After the discovery of mesons
1/
August 25, 2025 at 1:13 PM
HISTORY OF PHYSICS
Unifying Hadrons with SU(3) Symmetry: On the discovery of the SU(3) Gell-Mann–Okubo mass formula
Early in the 20th century, the recognized elementary particles were the electron, proton, and neutron, along with the neutrino. After the discovery of mesons
1/
Unifying Hadrons with SU(3) Symmetry: On the discovery of the SU(3) Gell-Mann–Okubo mass formula
Early in the 20th century, the recognized elementary particles were the electron, proton, and neutron, along with the neutrino. After the discovery of mesons
1/
Reposted by Schwinger
In 3 (or more) dimensions, all fundamental particles are either fermions and bosons. But why?
This is a direct consequence of the properties of the configuration space for identical particles
🧵 1/14
This is a direct consequence of the properties of the configuration space for identical particles
🧵 1/14
August 1, 2025 at 9:32 PM
In 3 (or more) dimensions, all fundamental particles are either fermions and bosons. But why?
This is a direct consequence of the properties of the configuration space for identical particles
🧵 1/14
This is a direct consequence of the properties of the configuration space for identical particles
🧵 1/14
Reposted by Schwinger
This is incredible from Les Wright ! It has everything: lasers, home grown nonlinear optics crystals, and a home made Arduino-driven diamond saw. If you're planning to colonize Mars to avoid an apocalypse, include Les in your passenger list! youtu.be/RxjqMh3gkx8?...
A DIY Pockels cell!
YouTube video by Les' Lab
youtu.be
June 26, 2025 at 9:41 PM
This is incredible from Les Wright ! It has everything: lasers, home grown nonlinear optics crystals, and a home made Arduino-driven diamond saw. If you're planning to colonize Mars to avoid an apocalypse, include Les in your passenger list! youtu.be/RxjqMh3gkx8?...
Reposted by Schwinger
Before the charm quark was discovered in bound states, it was predicted via indirect effects. An early success story of the electroweak model and QFT!
Mary Gaillard and John Rosner, who both passed last week, contributed to calculating the charm quark mass
🧵1/11
Mary Gaillard and John Rosner, who both passed last week, contributed to calculating the charm quark mass
🧵1/11
May 31, 2025 at 9:54 AM
Before the charm quark was discovered in bound states, it was predicted via indirect effects. An early success story of the electroweak model and QFT!
Mary Gaillard and John Rosner, who both passed last week, contributed to calculating the charm quark mass
🧵1/11
Mary Gaillard and John Rosner, who both passed last week, contributed to calculating the charm quark mass
🧵1/11
Reposted by Schwinger
#PhysicsFactlet
A Shack-Hartmann sensor is a simple and widely used device to measure the phase profile of a wavefront (aka "where the light is coming from").
A mini 🧵
1/
#Optics #Physics
A Shack-Hartmann sensor is a simple and widely used device to measure the phase profile of a wavefront (aka "where the light is coming from").
A mini 🧵
1/
#Optics #Physics
May 27, 2025 at 9:28 AM
#PhysicsFactlet
A Shack-Hartmann sensor is a simple and widely used device to measure the phase profile of a wavefront (aka "where the light is coming from").
A mini 🧵
1/
#Optics #Physics
A Shack-Hartmann sensor is a simple and widely used device to measure the phase profile of a wavefront (aka "where the light is coming from").
A mini 🧵
1/
#Optics #Physics
Reposted by Schwinger
[Book][Open Access]
[SCOAP3 for Books]
Introduction to Elementary Particle Physics
Alessandro Bettini
Cambridge University Press, Third edition 2024
library.oapen.org/handle/20.50...
⚛️🧪
[SCOAP3 for Books]
Introduction to Elementary Particle Physics
Alessandro Bettini
Cambridge University Press, Third edition 2024
library.oapen.org/handle/20.50...
⚛️🧪
May 11, 2025 at 4:25 PM
[Book][Open Access]
[SCOAP3 for Books]
Introduction to Elementary Particle Physics
Alessandro Bettini
Cambridge University Press, Third edition 2024
library.oapen.org/handle/20.50...
⚛️🧪
[SCOAP3 for Books]
Introduction to Elementary Particle Physics
Alessandro Bettini
Cambridge University Press, Third edition 2024
library.oapen.org/handle/20.50...
⚛️🧪
Reposted by Schwinger
[Open Access]
Advanced Concepts in Particle and Field Theory
Tristan Hübsch
Cambridge University Press,
cambridge.org/core/books/a...
⚛️🧪
Advanced Concepts in Particle and Field Theory
Tristan Hübsch
Cambridge University Press,
cambridge.org/core/books/a...
⚛️🧪
May 11, 2025 at 4:46 PM
[Open Access]
Advanced Concepts in Particle and Field Theory
Tristan Hübsch
Cambridge University Press,
cambridge.org/core/books/a...
⚛️🧪
Advanced Concepts in Particle and Field Theory
Tristan Hübsch
Cambridge University Press,
cambridge.org/core/books/a...
⚛️🧪
Reposted by Schwinger
Renormalisation is a central concept in modern physics. It describes how the dynamics of a system change at different scales. A great way to understand and visualise renormalisation is the Ising model
(some math, but one can follow without it )
1/13
(some math, but one can follow without it )
1/13
April 21, 2025 at 7:29 AM
Renormalisation is a central concept in modern physics. It describes how the dynamics of a system change at different scales. A great way to understand and visualise renormalisation is the Ising model
(some math, but one can follow without it )
1/13
(some math, but one can follow without it )
1/13
Reposted by Schwinger
Las leyes de la física parecen estar diseñadas por ajuste fino para que pueda existir la vida. Pero la única alternativa al ajuste fino no es el principio antrópico, como parecen sugerir muchos divulgadores. Hay una tercera opción mucho más razonable:
divulgamadrid.blogspot.com/2017/12/dise...
divulgamadrid.blogspot.com/2017/12/dise...
¿Ha sido nuestro universo diseñado por un creador o es el resultado de un proceso de selección natural?
Diseño inteligente, principio antrópico y postulado de objetividad de la naturaleza
divulgamadrid.blogspot.com
March 30, 2025 at 9:01 AM
Las leyes de la física parecen estar diseñadas por ajuste fino para que pueda existir la vida. Pero la única alternativa al ajuste fino no es el principio antrópico, como parecen sugerir muchos divulgadores. Hay una tercera opción mucho más razonable:
divulgamadrid.blogspot.com/2017/12/dise...
divulgamadrid.blogspot.com/2017/12/dise...
Reposted by Schwinger
📚Una de las preguntas que más recibo: "¿me recomiendas algún libro para iniciarme en la estadística?"
Aquí te digo cinco. Y sólo es la 3a entrega de una saga que nunca va a terminar.
Con ustedes: libros y manuales para aprender estadística.
Referencias y + info: www.instagram.com/reel/DHHDICN...
Aquí te digo cinco. Y sólo es la 3a entrega de una saga que nunca va a terminar.
Con ustedes: libros y manuales para aprender estadística.
Referencias y + info: www.instagram.com/reel/DHHDICN...
March 13, 2025 at 10:24 AM
📚Una de las preguntas que más recibo: "¿me recomiendas algún libro para iniciarme en la estadística?"
Aquí te digo cinco. Y sólo es la 3a entrega de una saga que nunca va a terminar.
Con ustedes: libros y manuales para aprender estadística.
Referencias y + info: www.instagram.com/reel/DHHDICN...
Aquí te digo cinco. Y sólo es la 3a entrega de una saga que nunca va a terminar.
Con ustedes: libros y manuales para aprender estadística.
Referencias y + info: www.instagram.com/reel/DHHDICN...
Reposted by Schwinger
¿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🧵🧵👇🏻👇🏻
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🧵🧵👇🏻👇🏻
February 25, 2025 at 2:11 PM
¿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🧵🧵👇🏻👇🏻
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🧵🧵👇🏻👇🏻
Reposted by Schwinger
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.
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.
February 20, 2025 at 3:34 PM
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.
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.
Reposted by Schwinger
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/
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/
February 15, 2025 at 3:30 PM
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/
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/
Reposted by Schwinger
[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...
Introduction to General Relativity, Black Holes and Cosmology
Yvonne Choquet-Bruhat
🧪⚛️
1 - library.oapen.org/handle/20.50...
2 - inspirehep.net/files/b6b9e2...
February 12, 2025 at 3:20 PM
[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...
Introduction to General Relativity, Black Holes and Cosmology
Yvonne Choquet-Bruhat
🧪⚛️
1 - library.oapen.org/handle/20.50...
2 - inspirehep.net/files/b6b9e2...
Reposted by Schwinger
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.
February 11, 2025 at 4:31 PM
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.
Reposted by Schwinger
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.
February 9, 2025 at 5:56 PM
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.
Reposted by Schwinger
New video! Terence Tao on how we measure the cosmos: youtu.be/YdOXS_9_P4U
Terence Tao on how we measure the cosmos | Part 1
YouTube video by 3Blue1Brown
youtu.be
February 8, 2025 at 1:46 PM
New video! Terence Tao on how we measure the cosmos: youtu.be/YdOXS_9_P4U
Reposted by Schwinger
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)
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)
February 1, 2025 at 3:36 PM
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)
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)
Reposted by Schwinger
[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...
[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...
January 19, 2025 at 5:21 PM
[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...
[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...
Reposted by Schwinger
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/
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/
January 14, 2025 at 3:00 PM
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/
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/
Reposted by Schwinger
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...
x.com/MartaSanMart...
x.com
x.com
January 5, 2025 at 11:24 PM
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...
x.com/MartaSanMart...
Reposted by Schwinger
Reposted by Schwinger
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!
December 20, 2024 at 11:49 AM
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!
Reposted by Schwinger
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
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
December 19, 2024 at 3:17 PM
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
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
Reposted by Schwinger
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/
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/
December 18, 2024 at 4:21 PM
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/
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/