I got physics on the brain at the moment so here's a tidbit..
We all know time gets weird when you approach the speed of light.
The tidbit is time doesn't change for the person who is moving. Local time is always one second per second.
That doesn't mean when you get out of your spaceship it doesn't get weird it means your time doesn't change.
@fesshole
No you don't. All motion is relative.
#relativity :-)
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)
https://phys.org/news/2025-04-einstein-field-theory.html
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.
@cenobyte - Does Professor Skye or her research assistant have any comment on the matter?
January 1928: The Dirac equation unifies quantum mechanics and special relativity
A seminal paper by Paul Dirac, who relied on mathematical intuition, laid the foundation for quantum electrodynamics.
By Nyla Husain (from the archives)
https://www.aps.org/apsnews/2024/11/mathematical-intuition-dirac-quantum-mechanics
On this day, six years ago, on 12 April 2019, both @LIGO instruments and the Virgo detector observed the gravitational-wave signal GW190412.
It was a signal like none before, because GW190412 was the first to come from two merging black holes with very different masses. Never-before-heard overtones in the frequencies of the gravitational-wave were observed. These also allowed a more precise determination of the properties of the two black holes.
https://www.aei.mpg.de/213678/a-signal-like-none-before
About a year later (on 20 April 2020), the paper with all the details of the discovery was published.
https://journals.aps.org/prd/abstract/10.1103/PhysRevD.102.043015 [Open Access]
It is a very dense black cat, so dense that it bends the space-time of the pillow. 
#catsofmastodon #cats #cat #physics #relativity #quantum #blackcats
https://phys.org/news/2025-03-physicist-revisits-limits-life-schrdinger.html
"This work connects the dots among the great pillars of twentieth century #physics #thermodynamics, #relativity, and #quantummechanics—for a major paradigm shift…implications of quantum information processing in wetware at ambient temperatures," said Kurian.
"Physicists and cosmologists should wrestle with these findings, especially as they consider the origins of life on Earth and elsewhere in the habitable universe, evolving in concert with the electromagnetic field."
Back in 1915, Einstein put forth his most ambitious idea: the general theory of relativity, combining #gravity with #relativity to create an entirely new conception of our #Universe.
In most conventional circumstances, the predictions of Einstein’s theory are indistinguishable from that of its predecessor: Newton’s law of universal gravitation.
Is it possible, then, to somehow reduce Einstein’s equations down to Newton’s equations?
#physics
https://bigthink.com/starts-with-a-bang/turn-einsteins-equations-newtons-law/
Postdoctoral positions in Computational Relativistic Astrophysics at our Potsdam institute
The “Computational Relativistic Astrophysics” department at the @mpi_grav in Potsdam led by Masaru Shibata announces the opening of postdoc appointments (2 years).
The department is currently composed of two group leaders, one senior scientist, and several postdoc researchers and students.
It focuses on several research topics in relativistic computational astrophysics including neutron star merger, collapsar, stellar core collapse and explosion, formation of supermassive black holes, and multi-messenger astronomy.
apply by 25 March 2025
To be fair, though, I must add that the LLM even mentioned the usual caveats here. But these may not have been understood by the person:
“requires rigorous mathematical formulation and testing - currently speculative without such validation”
“a tall order needing extensive proof”
“a hypothesis awaiting the hard test of evidence”
5/5
After all, what could possibly go wrong when non-physicists pour their “physics buzzword bingo” with questions that sound like physics (but are not) into an LLM that ultimately doesn't understand physics either?
If the LLM then says, among other things, “it does seem almost too logical and elegant to be completely wrong”, this is of course problematic. Especially if the person at that point decides not to listen to any experts at all…
4/
My objection that the central definition underlyinig the “theory” is not physical and ambiguous was completely ignored.
Worse still: because I was perceived to be to “stupid” has led the person to conclude that they will only discuss this with AIs in the future because “it obviously doesn't make sense (anymore) to discuss it with physicists.”
That's probably a problem.
3/
Often they have become so bogged down in their pseudo theories that it is almost impossible to have a meaningful discussion with them.
Sometimes you can try and present a well-reasoned objection. Whether the other side will get it, is a different question.
Recently, I had the case that the person had “discussed” their theory with an AI / LLM beforehand and, due to “praise” from the language model, was convinced that they *could not be wrong*.
2/
Today, I realized another risk of AI that I hadn't considered before, namely as a Dunning-Kruger amplifier.
At the institute, I regularly have contact with people (*) who think they have refuted the theory of relativity or solved other big physical problems.
Usually, these “solutions” are simply meaningless sentences that sound like physics, but are not physics.
1/
(*) So far only men.
Postdoctoral positions in Computational Relativistic Astrophysics at our Potsdam institute
The “Computational Relativistic Astrophysics” department at the @mpi_grav in Potsdam led by Masaru Shibata announces the opening of postdoc appointments (2 years).
The department is currently composed of two group leaders, one senior scientist, and several postdoc researchers and students.
It focuses on several research topics in relativistic computational astrophysics including neutron star merger, collapsar, stellar core collapse and explosion, formation of supermassive black holes, and multi-messenger astronomy.
apply by 25 March 2025
Postdoctoral positions in Computational Relativistic Astrophysics at our Potsdam institute
The “Computational Relativistic Astrophysics” department at the @mpi_grav in Potsdam led by Masaru Shibata announces the opening of postdoc appointments (2 years).
The department is currently composed of two group leaders, one senior scientist, and several postdoc researchers and students.
It focuses on several research topics in relativistic computational astrophysics including neutron star merger, collapsar, stellar core collapse and explosion, formation of supermassive black holes, and multi-messenger astronomy.
apply by 25 March 2025
Herman Minkowski's Space-Time (1908)
#Wikipedia: ❛❛ In physics, #MinkowskiSpace (or #Minkowski #SpaceTime) is the main #mathematical description of spacetime in the absence of gravitation. ❜❜
3-min #video: #Space & #Time Are One — Minkowski Spacetime Explained.
https://www.youtube.com/watch?v=XgXf2D1p7_Y 2023 Feb 16 https://Wikipedia.org/wiki/Minkowski_space https://Wikipedia.org/wiki/Hyperspace … #Hyperspace
A #graphic I adapted to #illustrate to my sons that their accusation is mistaken that their parents are getting slower with old age. Instead it is an #illusion entirely down to general #relativity. #Time moves much faster for us than for youngsters.
I don't think I've persuaded them though.
A question for the cosmologists. (I was going to say "Explain like I'm 5", but assume I've spent too much time listening to Katie Mack, Sean Carroll, Brians Greene and Cox, etc. and I have a bit of a clue... But I didn't study relativity, and have no experience with GR math).
Here goes...
Every time I hear "such and such happened at 10^-11 seconds, and a little later this thing happened at 10^-6 seconds" I wonder about the clock you're using.
At various times in the *very* early universe, the energy density was unimaginably huge. I'm assuming that has an effect on the flow of time, as well, no? I know there's no external clock to compare to, but what is the real meaning of these times, other than as a sequence of events, when the environment is undergoing such massive changes in energy density (or matter density, if we're talking a little later)?
I'm basically asking how those times are meaningful to me*, a guy thinking about it at this point in the universe, when the composition/distribution/volume of the observable universe does not faintly resemble that of the universe in the first fractions of a second that we're talking about.
(*Ignore for a moment that we can't comprehend those timespans even if the universe wasn't changing)
Please boost for reach if you are in the astronomy community, I'm not sure which hashtags to use for this...
#Cosmology #Astronomy #BigBangTheory #Relativity
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