MotionMountain
@motionmountain.mastodon.social.ap.brid.gy
Here are 5 free physics pdf textbooks I wrote, in English, Spanish and in several other languages, translated by volunteers: https://motionmountain.net […]
🌉 bridged from https://mastodon.social/@MotionMountain on the fediverse by https://fed.brid.gy/
🌉 bridged from https://mastodon.social/@MotionMountain on the fediverse by https://fed.brid.gy/
A topologist's dream
https://motionmountain.substack.com/publish/post/185500372?r=5ivfcr&utm_campaign=post&utm_medium=web&showWelcomeOnShare=true
https://motionmountain.substack.com/publish/post/185500372?r=5ivfcr&utm_campaign=post&utm_medium=web&showWelcomeOnShare=true
A topologist's dream
How Dirac's trick explains nature, matter, quantum theory and general relativity
motionmountain.substack.com
February 7, 2026 at 12:51 AM
What about solving with AI the following open problem:
Find a formula telling by how much a long rope of radius 1 gets shorter when you tie a tight knot into it.
If you can solve this problem, I know a similar one that will make your program known across the world.
Find a formula telling by how much a long rope of radius 1 gets shorter when you tie a tight knot into it.
If you can solve this problem, I know a similar one that will make your program known across the world.
February 5, 2026 at 6:57 PM
What about solving with AI the following open problem:
Find a formula telling by how much a long rope of radius 1 gets shorter when you tie a tight knot into it.
If you can solve this problem, I know a similar one that will make your program known across the world.
Find a formula telling by how much a long rope of radius 1 gets shorter when you tie a tight knot into it.
If you can solve this problem, I know a similar one that will make your program known across the world.
Why the unification of physics was not achieved for so long - Part 2
https://open.substack.com/pub/motionmountain/p/why-the-unification-of-physics-was-b3f?r=5ivfcr&utm_campaign=post&utm_medium=web&showWelcomeOnShare=true
https://open.substack.com/pub/motionmountain/p/why-the-unification-of-physics-was-b3f?r=5ivfcr&utm_campaign=post&utm_medium=web&showWelcomeOnShare=true
Why the unification of physics was not achieved for so long - Part 2
Spoiler: it is because of Dirac
motionmountain.substack.com
January 27, 2026 at 4:29 PM
Why the unification of physics was not achieved for so long - Part 2
https://open.substack.com/pub/motionmountain/p/why-the-unification-of-physics-was-b3f?r=5ivfcr&utm_campaign=post&utm_medium=web&showWelcomeOnShare=true
https://open.substack.com/pub/motionmountain/p/why-the-unification-of-physics-was-b3f?r=5ivfcr&utm_campaign=post&utm_medium=web&showWelcomeOnShare=true
As long as the tiny theory remains the correct unification of general relativity and of the standard model of particle physics with massive neutrinos, it predicts the lack of new physics and of new quantum gravity effects, but explains all open issues […]
Original post on mastodon.social
mastodon.social
January 27, 2026 at 5:59 AM
As long as the tiny theory remains the correct unification of general relativity and of the standard model of particle physics with massive neutrinos, it predicts the lack of new physics and of new quantum gravity effects, but explains all open issues […]
The text presenting the tiny theory of physics has been reworked. See https://www.researchgate.net/publication/397264142
The text unifies physics. Because the text is dear to me, for any good (and first) advice on how to improve it - without AI - I will invite you to dinner.
The text unifies physics. Because the text is dear to me, for any good (and first) advice on how to improve it - without AI - I will invite you to dinner.
January 24, 2026 at 6:34 AM
The text presenting the tiny theory of physics has been reworked. See https://www.researchgate.net/publication/397264142
The text unifies physics. Because the text is dear to me, for any good (and first) advice on how to improve it - without AI - I will invite you to dinner.
The text unifies physics. Because the text is dear to me, for any good (and first) advice on how to improve it - without AI - I will invite you to dinner.
Why the unification of physics was not achieved - Part 1
https://open.substack.com/pub/motionmountain/p/why-the-unification-of-physics-was?r=5ivfcr&utm_campaign=post&utm_medium=web&showWelcomeOnShare=true
https://open.substack.com/pub/motionmountain/p/why-the-unification-of-physics-was?r=5ivfcr&utm_campaign=post&utm_medium=web&showWelcomeOnShare=true
Why the unification of physics was not achieved - Part 1
Spoiler: it is because of the minimum length
motionmountain.substack.com
January 23, 2026 at 11:56 AM
Why the unification of physics was not achieved - Part 1
https://open.substack.com/pub/motionmountain/p/why-the-unification-of-physics-was?r=5ivfcr&utm_campaign=post&utm_medium=web&showWelcomeOnShare=true
https://open.substack.com/pub/motionmountain/p/why-the-unification-of-physics-was?r=5ivfcr&utm_campaign=post&utm_medium=web&showWelcomeOnShare=true
The maximum force in nature
https://open.substack.com/pub/motionmountain/p/the-maximum-force-in-nature?r=5ivfcr&utm_campaign=post&utm_medium=web&showWelcomeOnShare=true
https://open.substack.com/pub/motionmountain/p/the-maximum-force-in-nature?r=5ivfcr&utm_campaign=post&utm_medium=web&showWelcomeOnShare=true
The maximum force in nature
It is given by c⁴/4G and its value, about 3∙10⁴³ N, is huge.
motionmountain.substack.com
January 9, 2026 at 9:15 PM
How AI will influence research in fundamental physics
https://open.substack.com/pub/motionmountain/p/how-ai-will-influence-research-in?r=5ivfcr&utm_campaign=post&utm_medium=web&showWelcomeOnShare=true
https://open.substack.com/pub/motionmountain/p/how-ai-will-influence-research-in?r=5ivfcr&utm_campaign=post&utm_medium=web&showWelcomeOnShare=true
How AI will influence research in fundamental physics
Positively and negatively
motionmountain.substack.com
January 5, 2026 at 4:55 PM
How AI will influence research in fundamental physics
https://open.substack.com/pub/motionmountain/p/how-ai-will-influence-research-in?r=5ivfcr&utm_campaign=post&utm_medium=web&showWelcomeOnShare=true
https://open.substack.com/pub/motionmountain/p/how-ai-will-influence-research-in?r=5ivfcr&utm_campaign=post&utm_medium=web&showWelcomeOnShare=true
A new year message to young researchers in fundamental physics
https://open.substack.com/pub/motionmountain/p/a-new-year-message-to-young-researchers?r=5ivfcr&utm_campaign=post&utm_medium=web&showWelcomeOnShare=true
https://open.substack.com/pub/motionmountain/p/a-new-year-message-to-young-researchers?r=5ivfcr&utm_campaign=post&utm_medium=web&showWelcomeOnShare=true
A new year message to young researchers in fundamental physics
For many decades, we - older physicists - have educated and motivated you, younger physicists, by exploring and pointing out the beauty of nature.
motionmountain.substack.com
December 27, 2025 at 10:12 AM
A new year message to young researchers in fundamental physics
https://open.substack.com/pub/motionmountain/p/a-new-year-message-to-young-researchers?r=5ivfcr&utm_campaign=post&utm_medium=web&showWelcomeOnShare=true
https://open.substack.com/pub/motionmountain/p/a-new-year-message-to-young-researchers?r=5ivfcr&utm_campaign=post&utm_medium=web&showWelcomeOnShare=true
Quantum gravity, the crisis in fundamental physics, arxiv, and ironic science
https://open.substack.com/pub/motionmountain/p/quantum-gravity-the-crisis-in-fundamental?r=5ivfcr&utm_campaign=post&utm_medium=web&showWelcomeOnShare=true
https://open.substack.com/pub/motionmountain/p/quantum-gravity-the-crisis-in-fundamental?r=5ivfcr&utm_campaign=post&utm_medium=web&showWelcomeOnShare=true
Quantum gravity, the crisis in fundamental physics, arxiv, and ironic science
On the difficulty of distinguishing a glass that is almost full from one that is almost empty.
motionmountain.substack.com
December 13, 2025 at 6:41 AM
Quantum gravity, the crisis in fundamental physics, arxiv, and ironic science
https://open.substack.com/pub/motionmountain/p/quantum-gravity-the-crisis-in-fundamental?r=5ivfcr&utm_campaign=post&utm_medium=web&showWelcomeOnShare=true
https://open.substack.com/pub/motionmountain/p/quantum-gravity-the-crisis-in-fundamental?r=5ivfcr&utm_campaign=post&utm_medium=web&showWelcomeOnShare=true
The origin of the principle of least action
The only known explanation for nature's laziness
https://open.substack.com/pub/motionmountain/p/the-origin-of-the-principle-of-least?r=5ivfcr&utm_campaign=post&utm_medium=web&showWelcomeOnShare=true
The only known explanation for nature's laziness
https://open.substack.com/pub/motionmountain/p/the-origin-of-the-principle-of-least?r=5ivfcr&utm_campaign=post&utm_medium=web&showWelcomeOnShare=true
The origin of the principle of least action
The only known explanation for nature's laziness
motionmountain.substack.com
December 5, 2025 at 4:53 PM
The origin of the principle of least action
The only known explanation for nature's laziness
https://open.substack.com/pub/motionmountain/p/the-origin-of-the-principle-of-least?r=5ivfcr&utm_campaign=post&utm_medium=web&showWelcomeOnShare=true
The only known explanation for nature's laziness
https://open.substack.com/pub/motionmountain/p/the-origin-of-the-principle-of-least?r=5ivfcr&utm_campaign=post&utm_medium=web&showWelcomeOnShare=true
The origin of Galileo's equivalence principle
Free post
https://open.substack.com/pub/motionmountain/p/the-origin-of-galileos-equivalence?r=5ivfcr&utm_campaign=post&utm_medium=web&showWelcomeOnShare=true
Free post
https://open.substack.com/pub/motionmountain/p/the-origin-of-galileos-equivalence?r=5ivfcr&utm_campaign=post&utm_medium=web&showWelcomeOnShare=true
The origin of Galileo's equivalence principle
How strands explain the identity of inertial and gravitational mass
motionmountain.substack.com
November 29, 2025 at 7:13 AM
The origin of Galileo's equivalence principle
Free post
https://open.substack.com/pub/motionmountain/p/the-origin-of-galileos-equivalence?r=5ivfcr&utm_campaign=post&utm_medium=web&showWelcomeOnShare=true
Free post
https://open.substack.com/pub/motionmountain/p/the-origin-of-galileos-equivalence?r=5ivfcr&utm_campaign=post&utm_medium=web&showWelcomeOnShare=true
The Yang-Mills mass gap problem
or how to fool researchers promising a million dollars that nobody will ever win
https://open.substack.com/pub/motionmountain/p/the-yang-mills-mass-gap-problem?r=5ivfcr&utm_campaign=post&utm_medium=web&showWelcomeOnShare=true
or how to fool researchers promising a million dollars that nobody will ever win
https://open.substack.com/pub/motionmountain/p/the-yang-mills-mass-gap-problem?r=5ivfcr&utm_campaign=post&utm_medium=web&showWelcomeOnShare=true
The Yang-Mills mass gap problem
or how to fool researchers promising a million dollars that nobody will ever win
motionmountain.substack.com
November 18, 2025 at 6:47 AM
The Yang-Mills mass gap problem
or how to fool researchers promising a million dollars that nobody will ever win
https://open.substack.com/pub/motionmountain/p/the-yang-mills-mass-gap-problem?r=5ivfcr&utm_campaign=post&utm_medium=web&showWelcomeOnShare=true
or how to fool researchers promising a million dollars that nobody will ever win
https://open.substack.com/pub/motionmountain/p/the-yang-mills-mass-gap-problem?r=5ivfcr&utm_campaign=post&utm_medium=web&showWelcomeOnShare=true
Why strands? The case of matter particles
A free blog entry.
https://open.substack.com/pub/motionmountain/p/why-strands-the-case-of-matter-particles?r=5ivfcr&utm_campaign=post&utm_medium=web&showWelcomeOnShare=true
A free blog entry.
https://open.substack.com/pub/motionmountain/p/why-strands-the-case-of-matter-particles?r=5ivfcr&utm_campaign=post&utm_medium=web&showWelcomeOnShare=true
Why strands? The case of matter particles
Only strands explain the properties of matter particles
motionmountain.substack.com
November 16, 2025 at 5:32 PM
Why strands? The case of matter particles
A free blog entry.
https://open.substack.com/pub/motionmountain/p/why-strands-the-case-of-matter-particles?r=5ivfcr&utm_campaign=post&utm_medium=web&showWelcomeOnShare=true
A free blog entry.
https://open.substack.com/pub/motionmountain/p/why-strands-the-case-of-matter-particles?r=5ivfcr&utm_campaign=post&utm_medium=web&showWelcomeOnShare=true
Physics can explain its own laws. Just search for "tiny theory" and see how all laws of physics can be deduced from a single principle.
https://www.youtube.com/watch?v=0_Px5gbs9i0
https://www.youtube.com/watch?v=0_Px5gbs9i0
November 15, 2025 at 3:56 PM
Physics can explain its own laws. Just search for "tiny theory" and see how all laws of physics can be deduced from a single principle.
https://www.youtube.com/watch?v=0_Px5gbs9i0
https://www.youtube.com/watch?v=0_Px5gbs9i0
Why strands? The case of black holes
https://open.substack.com/pub/motionmountain/p/why-strands-the-case-of-black-holes?r=5ivfcr&utm_campaign=post&utm_medium=web&showWelcomeOnShare=true
https://open.substack.com/pub/motionmountain/p/why-strands-the-case-of-black-holes?r=5ivfcr&utm_campaign=post&utm_medium=web&showWelcomeOnShare=true
Why strands? The case of black holes
Is nature really made of strands or is thus just a mathematical model?
motionmountain.substack.com
November 8, 2025 at 6:33 AM
Enjoy is the shortest possible summary of the strand tangle model - and how it derives general relativity, as well as the gauge interactions, the particle spectrum, the fundamental constants and the Lagrangian of the standard model.
https://www.researchgate.net/publication/397264142
https://www.researchgate.net/publication/397264142
November 4, 2025 at 7:16 PM
Enjoy is the shortest possible summary of the strand tangle model - and how it derives general relativity, as well as the gauge interactions, the particle spectrum, the fundamental constants and the Lagrangian of the standard model.
https://www.researchgate.net/publication/397264142
https://www.researchgate.net/publication/397264142
Enjoy this article about the minimum system entropy in nature:
https://www.mdpi.com/1099-4300/25/11/1511
https://www.mdpi.com/1099-4300/25/11/1511
November 3, 2025 at 9:02 AM
Enjoy this article about the minimum system entropy in nature:
https://www.mdpi.com/1099-4300/25/11/1511
https://www.mdpi.com/1099-4300/25/11/1511
Why strands?
Why empty space is made of strands.
https://open.substack.com/pub/motionmountain/p/why-strands?r=5ivfcr&utm_campaign=post&utm_medium=web&showWelcomeOnShare=true
Why empty space is made of strands.
https://open.substack.com/pub/motionmountain/p/why-strands?r=5ivfcr&utm_campaign=post&utm_medium=web&showWelcomeOnShare=true
Why strands?
And in particular, why must empty space be made of strands?
motionmountain.substack.com
November 1, 2025 at 10:06 AM
Why strands?
Why empty space is made of strands.
https://open.substack.com/pub/motionmountain/p/why-strands?r=5ivfcr&utm_campaign=post&utm_medium=web&showWelcomeOnShare=true
Why empty space is made of strands.
https://open.substack.com/pub/motionmountain/p/why-strands?r=5ivfcr&utm_campaign=post&utm_medium=web&showWelcomeOnShare=true
Why do protons and positrons have the same charge?
https://open.substack.com/pub/motionmountain/p/why-do-protons-and-positrons-have?r=5ivfcr&utm_campaign=post&utm_medium=web&showWelcomeOnShare=true
https://open.substack.com/pub/motionmountain/p/why-do-protons-and-positrons-have?r=5ivfcr&utm_campaign=post&utm_medium=web&showWelcomeOnShare=true
Why do protons and positrons have the same charge?
When we see a flower, we see colours due to atoms and molecules.
motionmountain.substack.com
October 26, 2025 at 6:31 AM
Why do protons and positrons have the same charge?
https://open.substack.com/pub/motionmountain/p/why-do-protons-and-positrons-have?r=5ivfcr&utm_campaign=post&utm_medium=web&showWelcomeOnShare=true
https://open.substack.com/pub/motionmountain/p/why-do-protons-and-positrons-have?r=5ivfcr&utm_campaign=post&utm_medium=web&showWelcomeOnShare=true
The universe is pointless - because of the minimum length
Free post at
https://open.substack.com/pub/motionmountain/p/the-universe-is-pointless?r=5ivfcr&utm_campaign=post&utm_medium=web&showWelcomeOnShare=true
Free post at
https://open.substack.com/pub/motionmountain/p/the-universe-is-pointless?r=5ivfcr&utm_campaign=post&utm_medium=web&showWelcomeOnShare=true
The universe is pointless
because of the minimum length
motionmountain.substack.com
October 18, 2025 at 7:58 AM
The universe is pointless - because of the minimum length
Free post at
https://open.substack.com/pub/motionmountain/p/the-universe-is-pointless?r=5ivfcr&utm_campaign=post&utm_medium=web&showWelcomeOnShare=true
Free post at
https://open.substack.com/pub/motionmountain/p/the-universe-is-pointless?r=5ivfcr&utm_campaign=post&utm_medium=web&showWelcomeOnShare=true
Enjoy this text on the unification of quantum theory, particle physics and general relativity: https://www.researchgate.net/publication/389673692
By the way, if you find a sentence or an argument that is unclear or unsatisfying, let me know. If the reasons are good, I'll invite you to dinner.
By the way, if you find a sentence or an argument that is unclear or unsatisfying, let me know. If the reasons are good, I'll invite you to dinner.
October 16, 2025 at 6:13 AM
Enjoy this text on the unification of quantum theory, particle physics and general relativity: https://www.researchgate.net/publication/389673692
By the way, if you find a sentence or an argument that is unclear or unsatisfying, let me know. If the reasons are good, I'll invite you to dinner.
By the way, if you find a sentence or an argument that is unclear or unsatisfying, let me know. If the reasons are good, I'll invite you to dinner.
