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Doing Without Dark Energy

Three mathematicians have a different explanation for the accelerating expansion of the universe that does without theories of “dark energy.” Einstein’s original equations for General Relativity actually predict cosmic acceleration due to an “instability,” they argue in paper published recently in Proceedings of the Royal Society A.

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Deathblow Dealt to Dark Matter Disks | Quanta Magazine

New data tracking the movements of millions of Milky Way stars have effectively ruled out the presence of a “dark disk” that could have offered important clues

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Dark matter: The mystery substance physics still can’t identify that makes up the majority of our universe

Cosmologists are heading back to their chalkboards as the experiments designed to figure out what this unknown 84 percent of our universe actually is come up empty.

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New insights on dark energy

The universe is not only expanding – it is accelerating outward, driven by what is commonly referred to as “dark energy.” The term is a poetic analogy to label for dark matter, the mysterious material that dominates the matter in the universe and that really is dark because it does not radiate light (it reveals itself via its gravitational influence on galaxies). Two explanations are commonly advanced to explain dark energy. The first, as Einstein once speculated, is that gravity itself causes objects to repel one another when they are far enough apart (he added this “cosmological constant” term to his equations). The second explanation hypothesizes (based on our current understanding of elementary particle physics) that the vacuum has properties that provide energy to the cosmos for expansion.

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Scientists Unveil New Inventory of Universe’s Dark Contents | Quanta Magazine

The first major results from the Dark Energy Survey signal the start of a new era of cosmology.

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Scientists Unveil New Inventory of Universe’s Dark Contents | Quanta Magazine

The first major results from the Dark Energy Survey signal the start of a new era of cosmology.

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Reinterpreting dark matter

Tom Broadhurst, an Ikerbasque researcher at the University of the Basque Country (UPV/EHU), has participated alongside scientists of the National Taiwan University in a piece of research that explores cold dark matter in depth and proposes new answers about the formation of galaxies and the structure of the Universe. These predictions, published in the prestigious journal Nature Physics, are being contrasted with fresh data provided by the Hubble space telescope.