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General Relativity

Infographic: the history of the universe. Credit: NASA

Artificial intelligence seeks to solve the dark energy problem

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This is according to the Dark Energy Survey Partnership, of which University College London is a founding member, hosts the Fermi National Accelerator Laboratory in the United States and includes more than 400 scientists from 25 institutions in 7 countries
time travel. Illustration: depositphotos.com

Exploring the reality of time travel: science fact versus science fiction

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While Einstein's theory of relativity shows the relationship between time and speed. Theoretical ideas such as wormholes offer possible methods, but practical challenges and paradoxes, such as the "grandfather paradox", complicate the feasibility of time travel in practice
The distribution of dark matter in a segment of the southern sky. Based on data from the ACT observatory in Chile that operated between 2007-2022. Courtesy of Princeton University and the University of Pennsylvania

A new map of dark matter verifies Einstein's theory of general relativity

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A groundbreaking new map of dark matter has been created using data from the Dark Energy Survey (DES), in an international collaboration of astronomers and physicists. The map shows the distribution of dark matter in the southern sky region, and is the most accurate and detailed map of its kind ever created

Another step towards quantum gravity

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Physicist Hikida from the University of Tokyo and his colleagues developed the dual model for Einstein's theory of gravity in three-dimensional de Sitter space. This is a significant step towards a model that will faithfully describe nature, i.e. the physics of quantum gravity under an expanding universe with a positive cosmological constant.
An artist's illustration depicting a spiral galaxy in deep space (this image is for illustration only, and does not depict any galaxy). Photo: depositphotos.com

Commendation from the Foundation for Gravity Research to Prof. Asher Yehalum from Ariel who offers an alternative to dark matter

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Prof. Yaholum explained why the rotation speed of the matter in the galaxies does not decrease as you move away from the center of the galaxy starting from the outskirts, but remains the same or even increases * It is estimated that dark matter is involved in the process. According to Prof. Yahlom and his colleagues, these phenomena can be explained according to a theory known as the theory of delay - the amount of time it takes for the effect of an event in the center of the galaxy to spread to its edges.
A space telescope image of the galaxy cluster Abell 2813 (also known as ACO 2813). Credit: ESA/Hubble and NASA, Do. Coe

A galaxy cluster that is also a giant gravitational lens

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The galaxy cluster has so much mass that it acts as a gravitational lens, causing light from more distant galaxies to bend around it. These distortions may appear in many different forms, such as long lines or arcs.
Observations made with the European Southern Observatory's (ESO) Very Large Telescope (VLT) have revealed for the first time that a star orbiting the supermassive black hole at the center of the Milky Way moves exactly as Einstein predicted in his theory of general relativity. Its orbit is in the shape of a rosette and not in the shape of an ellipse as Newton predicted in his theory of gravity. Figure: ESO

ESO's Giant Telescope in Chile watched the star dance around the supermassive black hole at the center of the Milky Way; Proves that Einstein was right

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The gravitational lensing of the galaxy LRG 3-757 imaged by the Hubble Space Telescope's Wide Field Camera #3. Photo: NASA/ESA / Hubble Space Telescope

Einstein's theory of relativity was also proven in a distant galaxy

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New theories that attempt to unify quantum computing and space-time physics may provide new insights into the fabric of the universe. Chart: Johnstone / Wikimedia.

Bits interwoven in space-time

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A thought trip

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Why is Einstein important?

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Graffiti drawing of Einstein and his famous formula. Photo: shutterstock

How Einstein reinvented reality

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Black holes in the five-dimensional universe. Image: University of Cambridge

A black hole in a five-dimensional universe could undermine general relativity

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Gravitational waves emanating from the merger of two black holes. Image: NASA/JPL

Proof of Einstein's theory of general relativity: "The discovery of gravitational waves opens a new window to the universe"

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Gravitational waves. Illustration: shutterstock

Have gravitational waves been found?

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The image of Einstein from a 1968 Israeli five pound banknote. Photo: Arkady Mazor / Shutterstock.com

The man who changed the universe: 60 years since the death of Albert Einstein

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Albert Einstein. Photo courtesy of the National Academy of Sciences

The greatest mistake of the greatest scientist

Prof. Stephen Hawking in a lecture at NASA, 2008. Photo: NASA. From Wikipedia

"Hawking's discussion of black holes drew attention to the need to unify the basic teachings in science

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gravity. Illustration: Yale University website

Einstein - the man who began to take us out of the matrix (part two)

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The pulsar PSR J0348+0432 system. Photo: NASA

Another victory for Einstein after a pair of stars in an extreme state put relativity to the hardest test ever

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The curvature of space-time according to Einstein's equations. Image: NASA

Einstein - the man who started to take us out of the matrix (part 1)

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The neutron detector of the Opera experiment in Gran Sassi in Italy. Photo: from Wikipedia

The OPERA team verified the results it received in September but not all the experimenters in the team are satisfied

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Computer simulation of material ejected during the fusion process of neutron stars (by Stefan Rosweg). The ejected material reaches great distances and creates the radio signal there.

A tool has been developed that will make it possible to discover neutron star mergers that are good candidates for studying gravitational waves

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The Abel 1689 galaxy cluster

Redshift of light from galaxy clusters - another confirmation of general relativity

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Engineered material or metamaterial. From Wikipedia

Electromagnetic General Relativity: Traveling with Metamaterials to Space

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