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Lê Nguyên Hoang
368 followers -
Founder of Science4All.org
Founder of Science4All.org

368 followers
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Dans cet article, je vous présente une vidéo assez longue sur les mathématiques de la relativité générale, à savoir les tenseurs de la géométrie riemannienne. On verra notamment que la courbure de l'espace-temps éloigne la pomme du sol.

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Imagine trying to put Sheldon Flash Cooper in cage? While in the frame of the cage, Sheldon gets contracted and fits in the cage, we seem to have to conclude the exact opposite from Sheldon’s frame. In this episode, we solve this apparent paradox using…

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E=mc² is probably the most beautiful equation of physics. Yet, its deep and subtle meaning is often misappropriated! In this video, I work out Einstein’s original thoughts to better understand the message he intended to convey.

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La question de ce défi Lê est la suivante. Si on accélère de façon constante, dépassera-t-on la vitesse de la lumière ? Le texte qui suit est un complément à la vidéo, qui sera un peu plus technique. Dilatation du Temps Dans la vidéo, je vous ai dit…

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Could a universe without border, not go on and on forever? Poincaré not only gave an answer, he also proposed a fundamental conjecture…

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Will there ever even be another Einstein? Doubtful. Einstein not only is a great genius, he’s also and most importantly the iconic figure of science, in its purest and greatest form.

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Leave your twin on Earth while you travel across the universe. When you come back, will you be younger or older than your twin? The answer lies in (gravitational) time dilation

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One of the most amazing thing about our universe is that we can see its baby picture by just looking up there. What’s equally surprising is that it’s only 50 years ago that we have seen this baby picture! Before that, Big Bang theories sounded ridiculous,…

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Because the young Einstein couldn’t accept the possibility of a universe with an end of time, he made obscure modifications to his equations… He would later call this the biggest blunder of his life! Yet, these days, these obscure modifications may…

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This video retraces Einstein’s footsteps towards worldwide celebrity. From his first steps into a theory of spacetime curvature to his epic dual with the greatest mathematician of that time and to the eventual confirmation of his theory through eclipse…
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