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#generalrelativity

1 post1 participant0 posts today
Public
katch wreck

`The present work aims at deriving the gauge theory of gravity using compact, finite-dimensional symmetries in a way that resembles the formulation of the fundamental interactions of the Standard Model... unified gravity can provide the basis for a complete, renormalizable theory of quantum gravity.`

iopscience.iop.org/article/10.

iopscience.iop.orgRadware Bot Manager Captcha
#physics#quantumMechanics#StandardModel
Public
Joe Heafner

[2412.01551] Cosmology and general relativity (GR) in upper secondary school through new targeted teaching materials: a study on student learning and motivation #ITeachPhysics #Cosmology #GeneralRelativity #SecondarySchool

arxiv.org/abs/2412.01551

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arXiv.orgCosmology and general relativity (GR) in upper secondary school through new targeted teaching materials: a study on student learning and motivationCosmology and GR remain largely inaccessible to high-school teaching due to the advanced prerequisites to master these topics. Integrating them into upper secondary teaching is a significant challenge that remains unresolved. This contribution reports on an implementation study of a GR and cosmology course for upper secondary school students as part of an educational project launched during the centenary of GR and tested ever since for several years. The course aimed to expand students' knowledge to include current physics topics while highlighting their foundations in areas of classical physics such as Newtonian mechanics, electromagnetism, and waves. Targeted teaching and learning materials are focused on conceptual and qualitative understanding, while systematically combined with a mathematical treatment accessible at the upper secondary level, avoiding oversimplification. A key element is an active learning approach, incorporating activities and tasks such as engaging applications related to current research, reflective exercises, thought experiments, and hands-on tasks. The main research objective was to explore whether a conceptually deep and educationally effective GR and cosmology course could be successfully implemented for non-specialist upper secondary students. A pre-post study assessed both conceptual learning and affective outcomes, including interest, curiosity, self-concept, and perceived relevance of science. Results showed encouraging gains in both learning and motivation, with large to very large effect sizes for conceptual learning of core principles. Additionally, no or small effects of predictors such as gender were observed. We conclude that the integration of GR and cosmology into upper secondary physics teaching, in the form of courses and materials that are engaging, comprehensible, and impactful, is feasible.
Public
C.

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)

phys.org/news/2025-04-einstein

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?

Phys.org · Einstein's dream of a unified field theory accomplished?By Jussi Lindgren
#relativity#GeneralRelativity#electromagnetic
Public
Gravity Grinch

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?! arxiv.org/abs/2504.08286

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arXiv.orgNumerical evolution of Maxwell's equations for wavefronts propagating through a spherical gravitational potentialWe present a scheme for numerically solving Maxwell's equations in a weakly perturbed spacetime without introducing the usual geometric optics approximation. Using this scheme, we study light propagation through a spherical perturbation of a stationary metric in the linear limit. Going beyond geometric approximation allows us to explore the wave optics effects that occur when the wavefront propagates through the gravitational potential. We find that the wavefront breaks on the gravitational potential due to the Shapiro time delay, i.e. due to the slowing down of light when propagating in an inhomogeneous spacetime. This again leads to constructive interference, resulting in a persistent frequency dependent amplification of parts of the wave amplitude. When the wave length is shorter than a certain threshold set by the induced gravitational mass, the waves are reflected on the curvature gradient.
#astronomy#GeneralRelativity#DarkMatter
Public
Joe Heafner

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

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arXiv.orgEinstein's elevator and the principle of equivalenceWe outlines here the design, execution, and educational outcomes of an intervention inspired by Einstein's elevator thought experiment, intended to introduce secondary school students to the principle of equivalence, which is at the basis of the theory of General Relativity. We build an experimental version of Einstein's elevator, which simulated the effects of free-fall in an accelerated reference frame: a detailed description of the experimental apparatus and its construction is provided, highlighting the challenges and innovations in creating a simple yet functional setup using everyday materials.
#ITeachPhysics#GeneralRelativity
Public
CosmicRami

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.

In the centre is an elliptical galaxy, seen as an oval-shaped glow around a small bright core. Around this is wrapped a broad band of light, appearing like a spiral galaxy stretched and warped into a ring, with bright blue lines drawn through it where the spiral arms have been stretched into circles. A few distant objects are visible around the ring on a black background.
In the centre is an elliptical galaxy, seen as an oval-shaped glow around a small bright core. Around this is wrapped a broad band of light, appearing like a spiral galaxy stretched and warped into a ring, with bright blue lines drawn through it where the spiral arms have been stretched into circles. A few distant objects are visible around the ring on a black background. The image has been annotated to point out the foreground galaxy as well as the background spiral.
#astronomy#astrophysics#generalrelativity
Public
rexi

phys.org/news/2025-03-gravity-

…quantifies the difference between the metric of #spacetime and the metric induced by #matter fields.

…modified Einstein equations that, in the low coupling regime, i.e., low energies and small curvature, reduce to the classical equations of #generalrelativity…predicting the emergence of a small, positive cosmological constant—a value that aligns with experimental observations of the universe's accelerated expansion…

Phys.org · Gravity from entropy: A radical new approach to unifying quantum mechanics and general relativityBy Queen Mary, University of London
#quantumgravity#quantuminformation
Public
Gravity Grinch

Here are some very sad news on an already sad day! 💔
ihes.fr/en/yvonne-choquet-bruh
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: library.oapen.org/handle/20.50

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

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