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#generalrelativity

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C.<p>Unifying general relativity and the electromagnetic force? (I presume this also includes the weak nuclear force at sufficiently high energies, but this summary doesn't say)</p><p><a href="https://phys.org/news/2025-04-einstein-field-theory.html" rel="nofollow noopener noreferrer" translate="no" target="_blank"><span class="invisible">https://</span><span class="ellipsis">phys.org/news/2025-04-einstein</span><span class="invisible">-field-theory.html</span></a></p><p>I'm pretty much at the limit of my understanding of field theories and such just in this summary article, I don't think I'll even try their full journal article.</p><p><span class="h-card" translate="no"><a href="https://mastodon.thirring.org/@cenobyte" class="u-url mention" rel="nofollow noopener noreferrer" target="_blank">@<span>cenobyte</span></a></span> - Does Professor Skye or her research assistant have any comment on the matter?</p><p><a href="https://mindly.social/tags/relativity" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>relativity</span></a> <a href="https://mindly.social/tags/GeneralRelativity" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>GeneralRelativity</span></a> <a href="https://mindly.social/tags/electromagnetic" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>electromagnetic</span></a> <a href="https://mindly.social/tags/force" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>force</span></a> <a href="https://mindly.social/tags/field" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>field</span></a> <a href="https://mindly.social/tags/TOE" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>TOE</span></a> <a href="https://mindly.social/tags/GUT" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>GUT</span></a></p>
CosmicRami<p>Whooooaaaa! The new <a href="https://aus.social/tags/JWST" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>JWST</span></a> image is so good! So much physics going on — physics Einstein himself thought about!</p><p>This is called an Einstein Ring. When a massive foreground galaxy (in this case, an elliptical galaxy) warps the space-time around it, light from behind it bends in our direction.</p><p>The JWST caught this fantastic example, where the background spiral galaxy is getting warped into our view. It appears as a ring, but we can see its structures like its spiral arms, gas features and star clusters. </p><p>Incredible science happening here! </p><p>📸 ESA/Webb/NASA/CSA/G. Mahler </p><p>I added the annotations in the second image.</p><p><a href="https://aus.social/tags/astronomy" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>astronomy</span></a> <a href="https://aus.social/tags/astrophysics" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>astrophysics</span></a> <a href="https://aus.social/tags/generalrelativity" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>generalrelativity</span></a> <a href="https://aus.social/tags/galaxies" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>galaxies</span></a> <a href="https://aus.social/tags/science" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>science</span></a> <a href="https://aus.social/tags/gravitationallens" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>gravitationallens</span></a> <a href="https://aus.social/tags/Astrodon" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>Astrodon</span></a></p>
angst-ridden wanderer<p>Here we observe Einstein’s theories in action. Time dilation occurs in the faster iPhone due to its accelerated CPU.</p><p><a href="https://turtleisland.social/tags/BadPhysics" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>BadPhysics</span></a> <a href="https://turtleisland.social/tags/GeneralRelativity" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>GeneralRelativity</span></a></p>
IT News<p>You Are Already Traveling at the Speed of Light - Science fiction authors and readers dream of travelling at the speed of light, but... - <a href="https://hackaday.com/2025/03/10/you-are-already-traveling-at-the-speed-of-light/" rel="nofollow noopener noreferrer" translate="no" target="_blank"><span class="invisible">https://</span><span class="ellipsis">hackaday.com/2025/03/10/you-ar</span><span class="invisible">e-already-traveling-at-the-speed-of-light/</span></a> <a href="https://schleuss.online/tags/generalrelativity" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>generalrelativity</span></a> <a href="https://schleuss.online/tags/science" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>science</span></a> <a href="https://schleuss.online/tags/physics" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>physics</span></a></p>
Steven Carneiro<p>Testing quantum gravity in the lab:<br><a href="https://social.vivaldi.net/tags/quantumphysics" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>quantumphysics</span></a> <a href="https://social.vivaldi.net/tags/quantummechanics" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>quantummechanics</span></a> <a href="https://social.vivaldi.net/tags/gravity" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>gravity</span></a> <a href="https://social.vivaldi.net/tags/generalrelativity" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>generalrelativity</span></a> <a href="https://social.vivaldi.net/tags/model" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>model</span></a> <a href="https://social.vivaldi.net/tags/research" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>research</span></a> <a href="https://social.vivaldi.net/tags/science" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>science</span></a><br>🥼</p><p><a href="https://phys.org/news/2024-09-theoretical-physicists-method-central-theory.html" rel="nofollow noopener noreferrer" translate="no" target="_blank"><span class="invisible">https://</span><span class="ellipsis">phys.org/news/2024-09-theoreti</span><span class="invisible">cal-physicists-method-central-theory.html</span></a></p>
Matt Willemsen<p>Mathematicians Attempt to Glimpse Past the Big Bang<br><a href="https://www.quantamagazine.org/mathematicians-attempt-to-glimpse-past-the-big-bang-20240531/" rel="nofollow noopener noreferrer" translate="no" target="_blank"><span class="invisible">https://www.</span><span class="ellipsis">quantamagazine.org/mathematici</span><span class="invisible">ans-attempt-to-glimpse-past-the-big-bang-20240531/</span></a> BigBang <a href="https://mastodon.social/tags/BlackHoles" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>BlackHoles</span></a> <a href="https://mastodon.social/tags/GeneralRelativity" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>GeneralRelativity</span></a> <a href="https://mastodon.social/tags/geometry" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>geometry</span></a> <a href="https://mastodon.social/tags/gravity" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>gravity</span></a> <a href="https://mastodon.social/tags/inflation" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>inflation</span></a> <a href="https://mastodon.social/tags/mathematics" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>mathematics</span></a> <a href="https://mastodon.social/tags/physics" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>physics</span></a></p>
Debbie Goldsmith 🏳️‍⚧️♾️🇺🇦⧖<p>There's singularities and singularities.</p><p>Mathematicians Attempt to Glimpse Past the Big Bang | Quanta Magazine <a href="https://www.quantamagazine.org/mathematicians-attempt-to-glimpse-past-the-big-bang-20240531/" rel="nofollow noopener noreferrer" translate="no" target="_blank"><span class="invisible">https://www.</span><span class="ellipsis">quantamagazine.org/mathematici</span><span class="invisible">ans-attempt-to-glimpse-past-the-big-bang-20240531/</span></a></p><p><a href="https://mastodon.social/tags/cosmology" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>cosmology</span></a> <a href="https://mastodon.social/tags/MathematicalPhysics" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>MathematicalPhysics</span></a> <a href="https://mastodon.social/tags/GeneralRelativity" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>GeneralRelativity</span></a></p>
IT News<p>New warp drive concept does twist space, doesn’t move us very fast - Enlarge / The Enterprise, caught in the wake of a temporal vortex, witn... - <a href="https://arstechnica.com/?p=2025766" rel="nofollow noopener noreferrer" translate="no" target="_blank"><span class="invisible">https://</span><span class="">arstechnica.com/?p=2025766</span><span class="invisible"></span></a> <a href="https://schleuss.online/tags/fasterthanlighttravel" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>fasterthanlighttravel</span></a> <a href="https://schleuss.online/tags/generalrelativity" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>generalrelativity</span></a> <a href="https://schleuss.online/tags/warpdrive" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>warpdrive</span></a> <a href="https://schleuss.online/tags/science" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>science</span></a> <a href="https://schleuss.online/tags/physics" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>physics</span></a></p>
Reymond Aguinaldo<p>“What would you ask Albert Einstein if he were alive today?”</p><p>There are many questions, but these are among the first ones that come to mind.</p><p><a href="https://mastodon.social/tags/Physics" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>Physics</span></a> <a href="https://mastodon.social/tags/Science" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>Science</span></a> <a href="https://mastodon.social/tags/AlbertEinstein" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>AlbertEinstein</span></a> <a href="https://mastodon.social/tags/GeneralRelativity" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>GeneralRelativity</span></a> <a href="https://mastodon.social/tags/DarkMatter" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>DarkMatter</span></a> <a href="https://mastodon.social/tags/DarkEnergy" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>DarkEnergy</span></a> <a href="https://mastodon.social/tags/QuantumMechanics" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>QuantumMechanics</span></a> <a href="https://mastodon.social/tags/Astronomy" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>Astronomy</span></a> <a href="https://mastodon.social/tags/Astrodon" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>Astrodon</span></a></p>
Ricardo Harvin<p>Dr. (and <a href="https://mstdn.social/tags/pilot" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>pilot</span></a>) <a href="https://mstdn.social/tags/KatieMack" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>KatieMack</span></a> on how a <a href="https://mstdn.social/tags/SolarEclipse" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>SolarEclipse</span></a> more than a century ago helped to prove that <a href="https://mstdn.social/tags/Einstein" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>Einstein</span></a>'s theory of <a href="https://mstdn.social/tags/GeneralRelativity" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>GeneralRelativity</span></a> was (mostly?) correct.</p><p><a href="https://mstdn.social/tags/link" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>link</span></a>: <a href="https://www.sciencefocus.com/comment/solar-eclipse-deeper-into-universe" rel="nofollow noopener noreferrer" translate="no" target="_blank"><span class="invisible">https://www.</span><span class="ellipsis">sciencefocus.com/comment/solar</span><span class="invisible">-eclipse-deeper-into-universe</span></a></p><p>More of Dr. Mack's articles:<br><a href="https://mstdn.social/tags/link" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>link</span></a>: <a href="https://www.sciencefocus.com/author/dr-katie-mack" rel="nofollow noopener noreferrer" translate="no" target="_blank"><span class="invisible">https://www.</span><span class="ellipsis">sciencefocus.com/author/dr-kat</span><span class="invisible">ie-mack</span></a></p>
legraLeGra<p>If you cannot view the <a href="https://fediscience.org/tags/eclipse" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>eclipse</span></a>, <a href="https://fediscience.org/tags/nasa" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>nasa</span></a> will have English, Spanish, and silent flavors of streaming from 1p EST. </p><p><a href="https://www.nasa.gov/news-release/how-to-watch-upcoming-total-solar-eclipse-with-nasa-from-anywhere/" rel="nofollow noopener noreferrer" translate="no" target="_blank"><span class="invisible">https://www.</span><span class="ellipsis">nasa.gov/news-release/how-to-w</span><span class="invisible">atch-upcoming-total-solar-eclipse-with-nasa-from-anywhere/</span></a></p><p>Einsteins <a href="https://fediscience.org/tags/GeneralRelativity" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>GeneralRelativity</span></a> predicted that massive objects like the sun should bend light with their massive gravity. Photos of stars at night versus during an eclipse show this effect.</p>
Debbie Goldsmith 🏳️‍⚧️♾️🇺🇦⧖<p>If you're curious why time passes more quickly on the Moon, it's this:<br><a href="https://en.wikipedia.org/wiki/Gravitational_time_dilation" rel="nofollow noopener noreferrer" translate="no" target="_blank"><span class="invisible">https://</span><span class="ellipsis">en.wikipedia.org/wiki/Gravitat</span><span class="invisible">ional_time_dilation</span></a> Because Earth's gravity is higher, there’s more time dilation than on the Moon (by about 58.7 microseconds per day, or 2.144 seconds per century).</p><p>One way to think about it is that the local neighborhood of spacetime for someone standing on the Earth's surface is boosted (“tilted”, in a 4D sense) relative to that for someone far away from any massive body.</p><p> <a href="https://mastodon.social/tags/GeneralRelativity" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>GeneralRelativity</span></a> <a href="https://mastodon.social/tags/time" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>time</span></a></p>
Debbie Goldsmith 🏳️‍⚧️♾️🇺🇦⧖<p>I keep seeing the news about lunar time presented as “the Moon is getting its own time zone." What's actually happening is the Moon is getting its own time *standard*. The problem being solved is that time passes slightly more quickly on the Moon compared to Earth (due to General Relativity) and so the Moon needs its own time standard for precise measurements and navigation. UTC is the time standard for measuring time on Earth, and LTC is being created for the Moon.</p><p><a href="https://mastodon.social/tags/GeneralRelativity" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>GeneralRelativity</span></a> <a href="https://mastodon.social/tags/time" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>time</span></a></p>
Prof Heino Falcke<p>I had the privilege to open a <a href="https://mastodon.social/tags/science" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>science</span></a>, <a href="https://mastodon.social/tags/history" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>history</span></a> and <a href="https://mastodon.social/tags/arts" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>arts</span></a> black hole exhibition in <a href="https://mastodon.social/tags/Boerhaave" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>Boerhaave</span></a> <a href="https://mastodon.social/tags/Museum" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>Museum</span></a> in Leiden. You find drawings from <a href="https://mastodon.social/tags/Escher" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>Escher</span></a>, a telegram from Lorentz informing Einstein of the Eddington expedition that proved him correct, original Penrose diagrams, and, of course, our picture of a black hole. </p><p><a href="https://mastodon.social/tags/astronomy" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>astronomy</span></a> <a href="https://mastodon.social/tags/astrodon" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>astrodon</span></a> <a href="https://mastodon.social/tags/exhibition" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>exhibition</span></a> <a href="https://mastodon.social/tags/blackholes" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>blackholes</span></a> <a href="https://mastodon.social/tags/generalrelativity" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>generalrelativity</span></a> <a href="https://mastodon.social/tags/gravity" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>gravity</span></a></p>
Daniel Pomarède<p>A timely Nature cover, on the occasion of Albert Einstein 145ᵗʰ birthday.</p><p>The issue features a fascinating Review Article by Carla and Franz Kahn: «Letters from Einstein to de Sitter on the nature of the Universe»</p><p><a href="https://www.nature.com/articles/257451a0" rel="nofollow noopener noreferrer" translate="no" target="_blank"><span class="invisible">https://www.</span><span class="">nature.com/articles/257451a0</span><span class="invisible"></span></a></p><p><a href="https://mastodon.social/tags/universe" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>universe</span></a> <a href="https://mastodon.social/tags/Einstein" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>Einstein</span></a> <a href="https://mastodon.social/tags/deSitter" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>deSitter</span></a> <a href="https://mastodon.social/tags/physics" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>physics</span></a> <a href="https://mastodon.social/tags/science" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>science</span></a> <a href="https://mastodon.social/tags/nature" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>nature</span></a> <a href="https://mastodon.social/tags/cover" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>cover</span></a> <a href="https://mastodon.social/tags/naturecover" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>naturecover</span></a> <a href="https://mastodon.social/tags/cosmology" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>cosmology</span></a> <a href="https://mastodon.social/tags/history" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>history</span></a> <a href="https://mastodon.social/tags/philosophy" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>philosophy</span></a> <a href="https://mastodon.social/tags/letters" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>letters</span></a> <a href="https://mastodon.social/tags/astronomy" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>astronomy</span></a> <a href="https://mastodon.social/tags/astrophysics" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>astrophysics</span></a> <a href="https://mastodon.social/tags/relativity" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>relativity</span></a> <a href="https://mastodon.social/tags/generalrelativity" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>generalrelativity</span></a> <a href="https://mastodon.social/tags/astrodon" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>astrodon</span></a></p>
Matt Willemsen<p>Astrophysicist 'Fixes' General Relativity by Throwing Out a Major Law<br><a href="https://www.sciencealert.com/astrophysicist-fixes-general-relativity-by-throwing-out-a-major-law" rel="nofollow noopener noreferrer" translate="no" target="_blank"><span class="invisible">https://www.</span><span class="ellipsis">sciencealert.com/astrophysicis</span><span class="invisible">t-fixes-general-relativity-by-throwing-out-a-major-law</span></a> <a href="https://mastodon.social/tags/astrophysics" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>astrophysics</span></a> <a href="https://mastodon.social/tags/GeneralRelativity" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>GeneralRelativity</span></a> <a href="https://mastodon.social/tags/Renormalization" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>Renormalization</span></a></p>
SelfAwarePatterns<p>A new approach for reconciling general relativity and quantum mechanics proposes adding some randomness in general relativity, making it less deterministic on small scales.</p><p>For several decades, physicists have been trying to reconcile general relativity and quantum mechanics. These theories, despite each having been empirically validated to several decimal places, contradict each other. The problem is those contradictions seem to happen in places not conducive to empirical investigation, such as black holes or the early universe.</p><p>Most of the approaches to solving this try to quantize general relativity, in essence to find a theory of quantum gravity. This is what string theories and loop quantum gravity try to do. And there are others trying to “build up” to gravity and spacetime from quantum entanglement. But these approaches, and others, all seem to have their problems.</p><p>The new proposal <a href="https://science.slashdot.org/story/23/12/06/0118223/wobbly-spacetime-may-help-resolve-contradictory-physics-theories?utm_source=rss1.0mainlinkanon&amp;utm_medium=feed" rel="nofollow noopener noreferrer" target="_blank">is to keep spacetime smooth and continuous, but introduce some random wobbles into it</a>. It’s an interesting idea, one which may be testable in the near future. Most physicists seem skeptical, but the ones I’ve read so far <a href="https://bigthink.com/starts-with-a-bang/possible-gravity-isnt-quantum/" rel="nofollow noopener noreferrer" target="_blank">seem onboard with at least testing for it</a>. </p><p>If the idea turned out to be right, it wouldn’t be a case where general relativity, or classical physics overall, “won”, since GR would end up needing modifications. One thing I wonder is whether scientists would be tempted to regard randomness in GR as fundamental the same way many do for quantum physics. Or would it be seen as a new mystery to be solved?</p><p>I personally would see it as a mystery. But I’m saying that as someone whose intuition is that reality is ultimately deterministic. And that when we have a scientific theory with randomness in it, we need an explanation for that randomness. </p><p>But we might end up in a situation like quantum physics, where there are different “interpretations” on what’s going on. Many people like the idea of randomness being fundamental. Just as with QM, they might be more inclined to dig in and say that the wobbles are just the way things are. People like me would be left holding out for additional data, or at least new theoretical breakthroughs, to map that randomness back to something more mechanistic.</p><p>Incidentally, related to the previous post, it seems likely this would have implications for the many-worlds interpretation. That theory is usually seen as needing spacetime to be quantized. If it turned out, once and for all, that spacetime can’t, many-worlds might be falsified. Given <a href="https://www.theguardian.com/science/2023/dec/04/wobbly-spacetime-may-resolve-contradictory-physics-theories" rel="nofollow noopener noreferrer" target="_blank">Carlos Rovelli’s 5000:1 bet with the proposing theoretician Johnathan Oppenheim</a>, I suspect it would present issues for relational quantum mechanics as well. Just a reminder that many interpretations of QM aren’t just academic philosophies, but scientific theories in an of themselves.</p><p>But it’s also a reminder that no scientific theory can ever be confidently taken as the final word. New data can always dethrone a reigning theory. And that there remains value in continuing to stress test the fundamental structure of even the most successful theories.</p><p>What do you think? Would you welcome some randomness in your general relativity? Or like me, would you regard it as a new problem to be solved?</p><p><a href="https://selfawarepatterns.com/2023/12/09/what-would-randomness-in-general-relativity-mean/" rel="nofollow noopener noreferrer" target="_blank">https://selfawarepatterns.com/2023/12/09/what-would-randomness-in-general-relativity-mean/</a></p><p><a rel="nofollow noopener noreferrer" class="hashtag u-tag u-category" href="https://selfawarepatterns.com/tag/general-relativity/" target="_blank">#GeneralRelativity</a> <a rel="nofollow noopener noreferrer" class="hashtag u-tag u-category" href="https://selfawarepatterns.com/tag/philosophy-education/" target="_blank">#PhilosophyEducation</a> <a rel="nofollow noopener noreferrer" class="hashtag u-tag u-category" href="https://selfawarepatterns.com/tag/philosophy-of-science/" target="_blank">#PhilosophyOfScience</a> <a rel="nofollow noopener noreferrer" class="hashtag u-tag u-category" href="https://selfawarepatterns.com/tag/physics/" target="_blank">#Physics</a> <a rel="nofollow noopener noreferrer" class="hashtag u-tag u-category" href="https://selfawarepatterns.com/tag/quantum/" target="_blank">#Quantum</a> <a rel="nofollow noopener noreferrer" class="hashtag u-tag u-category" href="https://selfawarepatterns.com/tag/quantum-mechanics/" target="_blank">#QuantumMechanics</a> <a rel="nofollow noopener noreferrer" class="hashtag u-tag u-category" href="https://selfawarepatterns.com/tag/science/" target="_blank">#Science</a></p>
Norobiik @Norobiik@noc.social<p>"If <a href="https://noc.social/tags/antimatter" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>antimatter</span></a> fell upwards, opposite to <a href="https://noc.social/tags/gravity" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>gravity</span></a>, he said, 'one of the cornerstones of [<a href="https://noc.social/tags/AlbertEinstein" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>AlbertEinstein</span></a>’s theory of] <a href="https://noc.social/tags/GeneralRelativity" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>GeneralRelativity</span></a> would be wrong, the equivalence principle [which says] if you drop any object on earth, it should fall at the same rate.' "</p><p>Gravity test: Antimatter falls down, but where did it all go? | Science and Technology | Al Jazeera<br><a href="https://www.aljazeera.com/features/2023/9/28/gravity-test-antimatter-falls-down-but-where-did-it-all-go" rel="nofollow noopener noreferrer" target="_blank"><span class="invisible">https://www.</span><span class="ellipsis">aljazeera.com/features/2023/9/</span><span class="invisible">28/gravity-test-antimatter-falls-down-but-where-did-it-all-go</span></a></p>
𝕎𝕖𝕣𝕥𝕙𝕒𝕞<p>I am toiling over Dirac. This balancing on the dizzying path between genius and madness is awful. I don't understand the details of Dirac at all.<br><a href="https://mastodon.social/tags/Einstein" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>Einstein</span></a></p><p>Where's <a href="https://mastodon.social/tags/PaulDirac" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>PaulDirac</span></a>? 🥳 <br>favourite movie: 2001 A Space Odyssey<br>favourite singer: Cher<br><a href="https://mastodon.social/tags/physics" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>physics</span></a> <br><a href="https://mastodon.social/tags/quantummechanics" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>quantummechanics</span></a> <br><a href="https://mastodon.social/tags/generalrelativity" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>generalrelativity</span></a></p>
Daniel Pomarède<p>Well, since we are bracing for the impact of an imminent major announcement on pulsars and, maybe, some gravitational wave background, why not enjoy this 2004 special Science Magazine issue on pulsars!</p><p><a href="https://science.org/toc/science/304/5670" rel="nofollow noopener noreferrer" translate="no" target="_blank"><span class="invisible">https://</span><span class="ellipsis">science.org/toc/science/304/56</span><span class="invisible">70</span></a><br>see in particular the paper by Ingrid Stairs p.547</p><p><a href="https://mastodon.social/tags/pulsar" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>pulsar</span></a> <a href="https://mastodon.social/tags/pulsars" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>pulsars</span></a> <a href="https://mastodon.social/tags/pulsartiming" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>pulsartiming</span></a> <a href="https://mastodon.social/tags/nanograv" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>nanograv</span></a> <a href="https://mastodon.social/tags/physics" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>physics</span></a> <a href="https://mastodon.social/tags/universe" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>universe</span></a> <a href="https://mastodon.social/tags/astronomy" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>astronomy</span></a> <a href="https://mastodon.social/tags/astrophysics" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>astrophysics</span></a> <a href="https://mastodon.social/tags/astrodon" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>astrodon</span></a> <a href="https://mastodon.social/tags/science" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>science</span></a> <a href="https://mastodon.social/tags/cover" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>cover</span></a> <a href="https://mastodon.social/tags/covers" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>covers</span></a> <a href="https://mastodon.social/tags/sciencecovers" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>sciencecovers</span></a> <a href="https://mastodon.social/tags/space" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>space</span></a> <a href="https://mastodon.social/tags/research" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>research</span></a> <a href="https://mastodon.social/tags/gravitationalwaves" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>gravitationalwaves</span></a> <a href="https://mastodon.social/tags/relativity" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>relativity</span></a> <a href="https://mastodon.social/tags/generalrelativity" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>generalrelativity</span></a> <a href="https://mastodon.social/tags/cosmology" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>cosmology</span></a></p>
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