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?

Fresh from the @j824h_arXiv_astro_ph : calculating (numerically) the impact of a wave hitting a spherical overdensity in the cosmos, the wave suffers from a Shapiro delay and thus shows interference patterns. So do we really need fuzzy dark matter to observe interference?! https://arxiv.org/abs/2504.08286

[2504.01675] Einstein's elevator and the principle of equivalence https://arxiv.org/abs/2504.01675

#totp if you're in the right frame of reference (it would be a non-inertial one), then the sun does indeed go around the moon #GeneralRelativity

Whooooaaaa! The new #JWST image is so good! So much physics going on — physics Einstein himself thought about!

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.

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.

Incredible science happening here!

ESA/Webb/NASA/CSA/G. Mahler

I added the annotations in the second image.

Here we observe Einstein’s theories in action. Time dilation occurs in the faster iPhone due to its accelerated CPU.

You Are Already Traveling at the Speed of Light - Science fiction authors and readers dream of travelling at the speed of light, but... - https://hackaday.com/2025/03/10/you-are-already-traveling-at-the-speed-of-light/ #generalrelativity #science #physics

Today I learned that the person that proved the equations of general relativity (for empty space) always have well defined solutions was a french lady who died about three weeks ago.

Dr Yvonne Choquet-Bruhat proved this via results published in 1952 and 1969: https://en.wikipedia.org/wiki/Yvonne_Choquet-Bruhat #historyofscience #generalrelativity

`In general relativity, a white hole is a hypothetical region of spacetime and singularity that cannot be entered from the outside, although energy-matter, light and information can escape from it. In this sense, it is the reverse of a black hole, from which energy-matter, light and information cannot escape. `

https://en.wikipedia.org/wiki/White_hole

Here are some very sad news on an already sad day!
https://www.ihes.fr/en/yvonne-choquet-bruhat-eng/
Yvonne Choquet-Bruhat died yesterday at the age of 101. May she be united with Einstein again and the two can complete the GR-work that they had!
For everyone who wants to enjoy one of her works, have a look at this introduction to General Relativity: https://library.oapen.org/handle/20.500.12657/85657

#YvonneChoquet-Bruhat #GeneralRelativity #PioneersOfScience #History #science

#Euclid #telescope captures #EinsteinRing revealing #warping of #space | #EuropeanSpaceAgency | The Guardian

https://www.theguardian.com/science/2025/feb/10/euclid-telescope-captures-einstein-ring-revealing-warping-of-space

New DESI Results Weigh In On Gravity: Researchers used the Dark Energy Spectroscopic Instrument to map how nearly 6 million galaxies cluster across 11 billion years of cosmic history. Their observations line up with what Einstein's theory of general relativity predicts.

https://newscenter.lbl.gov/2024/11/19/new-desi-results-weigh-in-on-gravity/

Tiburtius Prize 2024 for Gustav Uhre Jakobsen

Recognition award for visiting postdoc at AEI Potsdam

Gustav Uhre Jakobsen, a postdoc at the Humboldt University of Berlin and in the Astrophysical and Cosmological Relativity Department at the @mpi_grav in the Potsdam Science Park, will be awarded a “Tirburtius Prize – Prize of the Berlin Universities” for his dissertation.

The reviewer praises not only the impressive wealth of topics in Jakobsen's doctoral thesis titled “Gravitational Scattering of Compact Bodies from Worldline Quantum Field Theory” and the quality of the research results, but also the impact it has had in the research community.

https://www.aei.mpg.de/1202051/tiburtius-prize-2024-for-gustav-uhre-jakobsen

[Einstein's theory and #observation data] Researchers have compared #DarkEnergySurvey data with predictions from Einstein's theory of #GeneralRelativity ... and discovered some #incompatibility ...

“We have discovered that very far in the past, 6 and 7 billion years ago, the depth of the #GravitationalSinks is completely compatible with Einstein's predictions. On the other hand, in the period closer to today, 3.5 and 5 billion years ago, they are a little shallower than predicted by Einstein”, reveals Isaac Tutusaus, assistant astronomer at IRAP / Université Paul Sabatier Toulouse III.

Is the slowdown in the growth of gravitational sinks linked to the acceleration of the #expansion of our #Universe? The answer will undoubtedly be found in a few years' time, thanks to more numerous and more precise data from the @ec_euclid mission.

Details+: https://www.irap.omp.eu/en/2024/11/einsteins-equations-collide-with-the-mysteries-of-the-universe/

Dear geodesists, astronomers, and astrophysicists: Does any of you know of some publication that explicitly reports the expression for the metric in a Geocentric Terrestrial Reference System (GTRS) or in the more specific International Terrestrial Reference System (ITRS)?

Various publications (eg https://doi.org/10.1086/378162) and textbooks (eg https://doi.org/10.1017/CBO9781139507486) report and discuss the metrics for the Geocentric Celestial Reference System (GCRS), but not for the GTRS. (Even though it seems to me that the expression should be formally identical, as the off-diagonal timelike components take care of rotation).

Cheers! (Sorry for spamming borderline hashtags.)

Does anyone happen to have an e-copy of S. Winitzki's "Topics in General Relativity"? Apparently it was freely available online until several years ago, but now I can't find a copy anywhere. Cheers!

https://sites.google.com/site/winitzki/index/topics-in-general-relativity

1 dakikada Genel Görelilik Teorisi

#generalrelativity #physics

https://www.youtube.com/shorts/-MP7f_IwM68