General Relativity Keeps Revealing Unexpected Spacetime Geometries That Go Far Beyond Everyday Intuition. In 1988, Kip Thorne and Michael Morris described a traversable Wormhole geometry that strangely connects two distant regions of Spacetime without an event horizon or central singularity. No traversable Wormhole has ever been observed. Within General Relativity, though, these solutions are mathematically valid if Spacetime is supported by exotic stress-energy that violates classical energy conditions. It's a solution Einstein’s field equations allow, but nature has not confirmed. #Einstein# #GeneralRelativity# #Wormholes# #Spacetime# #Physics# #Relativity#

Albert Einstein taught relativity at Lincoln University in 1946. The class was entirely African American at a time when racism was widespread in academia. Einstein supported these students and spoke openly against segregation, calling it a disease. For science, there are no human races—only human beings.

The physics books almost always get relativity wrong, as if it was just some revelation Einstein had, instead of being an implication he was forced to by Galileo and Maxwell. A short from @OriginsProject podcast ( #Science# #Physics# #LawrenceKrauss# #Einstein#

Einstein and David Hilbert independently pursued General Relativity. Einstein relied on physical intuition and thought experiments, while Hilbert used rigorous mathematics and advanced geometry. Einstein reached the final theory first, and Hilbert accepted it graciously. Hilbert’s efforts also led to Emmy Noether’s work, producing Noether’s Theorem—one of the deepest foundations of modern physics.

Dirac wrote it in 1928 so an electron could obey both quantum mechanics and special relativity; the γ matrices mix the components precisely as Lorentz transformations demand, while the mass term couples the two chiralities. A first-order equation for a four-component spinor that simultaneously carries energy, momentum, spin and the seed of antimatter. Gauged, the same compact line becomes the starting point of quantum electrodynamics and, with the appropriate internal symmetries, of the weak and strong interactions as well.

Adam Brown (@A_G_I_Joe) is back! General relativity is said to be the most beautiful idea the human mind has ever produced. Most of us will never get to fully appreciate its elegance by taking the 20-lecture graduate course Adam taught on it at Stanford. But in the video below, Adam distills the key idea at its heart so clearly and compellingly that even I could keep up lol. At the core of general relativity, Einstein is trying to figure out the principle behind a particular coincidence: that the mass that resists acceleration and the mass that gravity pulls on just happen to be exactly the same. Adam then leads us through the path of insight which Einstein called his “happiest thought.” Then Adam lectures on black holes. First, by showing how even under special relativity you could create a perpetual motion machine if black holes weren't truly black. And then, by explaining why the observations of an infalling observer and a distant bystander to the black hole would be so radically different Adam leads Blueshift, the team at Google DeepMind cracking science and reasoning. Which gave us the opportunity to discuss at the very end how close we are to AIs that could rediscover general relativity from scratch. Stay till the close for some philosophy of science. 0:00:00 – The coincidence that led Einstein to general relativity 0:16:42 – Gravity is a consequence of curved spacetime, not a force 0:31:46 – Why black holes prevent unlimited energy extraction 0:47:12 – Black holes are the ultimate power plants 1:13:50 – What falling into a black hole would actually feel like 1:18:51 – The three ways we know black holes are real 1:24:21 – The first time we saw gravity bend light 1:29:33 – How far can AI get without experimental evidence? Look up Dwarkesh Podcast on YouTube/Spotify to watch. Enjoy!

Every minute or so a cosmic ray muon goes through your body. If it weren't for relativity they would never make it down to Earth. A short from @OriginsProject podcast ( #Science# #Physics# #LawrenceKrauss# #relativity# #timedilation#

Einstein was forced to his conclusion that the speed of light was constant for all observers. The contradiction that changed 300 years of physics. A clip from this week's @OriginsProject podcast.( #Science# #Physics# #Einstein# #LawrenceKrauss# #Relativity#