2025-10-30T09:18:34Z https://yabu.me Vanessa https://yabu.me/npub14wp4nlt3yrg3rwurudnmgkhvma4fmzqawmhkdqq30295ecz44qhqplmlcg https://media.mathstodon.xyz/accounts/avatars/110/796/413/859/804/364/original/a955c7f5779f4a1b.jpg https://media.mathstodon.xyz/accounts/avatars/110/796/413/859/804/364/original/a955c7f5779f4a1b.jpg https://yabu.me/nevent1qqs8ru0xspmw46f6m7sszklr5uzsl9dkvzugpx43v73wukaanfvj5pczyz4cxk0awysdzydms03k0dz6an0k48vgr4mw7e5qz9agkn8q2k5zuyqtvsh just got my first crackpot mail from someone who wants to disprove Einstein. Guess I&#39;m a real physicist now 🥰 2025-01-21T14:08:28Z https://yabu.me/nevent1qqsr8khm6en9j8axetk9kahgtyzmqd8a5m94jndlc8kfdlvphm4xhtqzyz4cxk0awysdzydms03k0dz6an0k48vgr4mw7e5qz9agkn8q2k5zujwm9ld In reply to <a href='/nevent1qqstg9eak44vzga9e2md5tf4tzhvwywzku4a0d64g3nufhj9uq7m5eq3wzy8m'>nevent1q…zy8m</a><br/>_________________________<br/><br/>I just looked it up, and I seem to have misremembered: the GR-specific tensor diagrams are called &#34;Penrose graphical notation&#34; (<a href="https://en.wikipedia.org/wiki/Penrose_graphical_notation">https://en.wikipedia.org/wiki/Penrose_graphical_notation</a>) 2024-11-22T07:30:12Z https://yabu.me/nevent1qqsrnlx6ae30vg93sudnggnqzwlalal3tdw6520qjrds8uxm924l60szyz4cxk0awysdzydms03k0dz6an0k48vgr4mw7e5qz9agkn8q2k5zuah6ah7 In reply to <a href='/nevent1qqstxfhsetu4lmjlqrg7wg43lqyhjkz2lme2s943x6x25wkyrnusqnqea5zna'>nevent1q…5zna</a><br/>_________________________<br/><br/>When I read the sentence, &#34;We could be falling through the enormous event horizon of an enormous black hole right now&#34;, my first thought was &#34;yes, this applies to all spacetimes whose curvature is sufficiently small&#34;. But I was still amazed by how directly we can show this with the Kruskal-Szeres Penrose diagram. Thanks for explaining! 2024-11-21T21:26:33Z https://yabu.me/nevent1qqsxswejcq28v9mr3tplgckd7vqarejhp2fgylscec04zzeywjxrj5gzyz4cxk0awysdzydms03k0dz6an0k48vgr4mw7e5qz9agkn8q2k5zuxvhd7t In reply to <a href='/nevent1qqsxfkhhvunkwk93dlvzvza77z3eyhqalrqvg4ak5xdxsdqn0h5uh8gmvurx3'>nevent1q…urx3</a><br/>_________________________<br/><br/>You&#39;re right: all particles in QFT are &#34;ripples&#34; in quantum fields, and neutrinos are ripples in the neutrino fields. These ripples are in principle as &#34;strong&#34; as the ripples of any other particles out there, but the neutrino ripples just don&#39;t really interact with the ripples of the particles our measurement instruments are made of that much. That&#39;s why we mostly don&#39;t see them 2024-11-02T08:35:52Z https://yabu.me/nevent1qqsw9fxgacwlhksx59m8h37rlf8gf9ny8nf7y0x55q34fkqg62aprjqzyz4cxk0awysdzydms03k0dz6an0k48vgr4mw7e5qz9agkn8q2k5zuv7qs6d In reply to <a href='/nevent1qqsxc0h86yamd63xnd8ewl0cvk7sd5cwml8kee8kkpxnvrycxnydmmsvu9npt'>nevent1q…9npt</a><br/>_________________________<br/><br/>completely apart from the quantum nonsense: that recent dip in the polls looks more like a random Poisson fluke than anything else - especially because the trend has been accelerating upwards for the last two decades. 2024-10-24T20:10:35Z https://yabu.me/nevent1qqswhn6eltzfzrwpeu85ntcjhxy8wgwpg0a0czy3ufplz4ce29pxt5gzyz4cxk0awysdzydms03k0dz6an0k48vgr4mw7e5qz9agkn8q2k5zuwr8htk In reply to <a href='/nevent1qqspstpt5vdeu0ukunp5t0zuenh3ptedt45382f445hc03hthkqjvqg3k3at7'>nevent1q…3at7</a><br/>_________________________<br/><br/>Personally, for some reason I never really notice the lip-speech mismatch unless I&#39;m paying conscious attention to it. I mostly just watch programs dubbed into either English or French depending on my day-to-day mood. 2024-09-12T13:51:36Z https://yabu.me/nevent1qqsrtqpesmgak9cyywpspkhk0s5uxfyrfknu4wymh2g5e2trepxpeuczyz4cxk0awysdzydms03k0dz6an0k48vgr4mw7e5qz9agkn8q2k5zu5nkg9r New blog post: Salvaging the useful parts from the cult - a 2-year review of geometric algebra<br/><br/>In this post, I argue that a lot of the advantageous didactical techniques of geometric algebra are not exclusive to Clifford algebras, and that we are mostly better off reformulating them in classical maths and dropping the &#34;geometric algebra&#34; banner.<br/><br/><a href="https://ash64.eu/assets/ga_review.pdf">https://ash64.eu/assets/ga_review.pdf</a> 2024-09-07T13:22:32Z