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dark matter

What Sabine Hossenfelder hopes the James Webb telescope will do

Hossenfelder: What you can see from this graph is that if this theory is correct there basically shouldn’t be any large galaxies at very early times... If the Webb telescope sees large galaxies anyhow, then that’s going to be very difficult to explain with dark matter. Read More ›

Is there an alternative to dark matter?

Merritt: The most successful competitor is called modified Newtonian dynamics (MOND). Observations that are explained under the Standard Model by invoking dark matter are explained under MOND by postulating a modification to the theory of gravity. Read More ›

How Sabine Hossenfelder’s opinion of dark matter has changed over 20 years

She thinks the solution now is to combine dark matter with modified gravity. Now that will be a challenge. We kind of wish she would go back to denying free will and fine-tuning of the universe. Read More ›

“Ultra light bosons” explanation for dark matter doesn’t pan out either

At Universe Today: So once again, a search for dark matter has shown us not what dark matter is, but what it isn’t. It’s extremely frustrating, and potentially exciting because we are quickly running out of options for dark matter. Read More ›

Ethan Siegel: Failure to replicate a dark matter experiment is “an incredible success” for the scientific method

Siegel offers an inside look at the details. While the finding is doubtless a success for the scientific method, it must be frustrating for those physicists who need dark matter to exist in order to make cosmology understandable — but can’t find any. Read More ›

Dark matter and dark energy as 21st century Ptolemaic epicycles? – Rob Sheldon offers some thoughts

Why can’t they find dark matter, despite much search? Sheldon: The old joke is that a man is looking under a lamppost one night. The policeman asks what he is doing. "Looking for my keys" he replies. "Did you lose them here?" "No, but the light is better over here." (And the funding is better for some research than for others.) Read More ›