“the predictions of the standard model of the universe appear to be at odds with some recent observations.”

Right now, it looks like the cosmology is at a tipping point.

A brief explanation of how superfluid dark matter can combine fluid dark matter and modified gravity.

For galaxy clusters and for the cosmic microwave background, dark matter matter is the better explanation. But to explain galactic rotation curves and other properties of galaxies, modified gravity is the better explanation.

Until now, physicists have taken an either-or approach. In this video I argue that the answer may be a combination of both. This idea may be realized through dark matter which forms a superfluid. In this case dark matter has two phases, a normally fluid phase and a superfluid phase. In the latter phase, it has no internal friction and appears like modified gravity.

Taken together, so I argue, this explains the existing data best.

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New James Webb Space Telescope observations may have done with one of the longest-standing tensions in cosmology.

For almost a decade, astronomers have been struggling with a nagging mismatch between two different ways of determining the Hubble constant — a measure of the current expansion rate of the universe. This mismatch, known as the Hubble tension, has led to claims that new physics might be needed to solve the issue. (Read about the “constant controversy” in the June 2019 issue of Sky & Telescope.)

But a detailed analysis of a new set of James Webb Space Telescope (JWST) observations now suggests that the problem may not exist. “As Carl Sagan said, extraordinary claims require extraordinary evidence,” says Wendy Freedman (University of Chicago), “and I don’t see extraordinary evidence.”