Hubble's Cosmic Expansion Disparity

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cosmic expansion rate

Quanta Magazine

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The Webb Telescope Further Deepens the Biggest Controversy in Cosmology | Quanta Magazine

Summary

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A long-awaited analysis of the James Webb Space Telescope’s observations once again gleans conflicting expansion rates from different types of data.

The results come after months of behind-the-scenes drama, as Wendy Freedman initially thought her analysis had killed the Hubble tension, only to see it come roaring back to life.

Two research teams led the way, using supernovas anchored to Cepheids and arriving at disagreeing values of 50 km/s/Mpc .

In 2001 , Freedman led a multiyear observing campaign using Hubble .

In 2011 , his team published an H0 value of 73 with an estimated 3% uncertainty.

In 2013 , they used the Planck telescope’s observations of light left over from the early universe to determine the shape and composition of the primordial cosmos.

Astronomers are beginning to turn to a new distance indicator: carbon-rich giant stars that belong to what’s called the J-region asymptotic giant branch.

Using TRGBs as distance indicators is more complex than using Cepheids , however.

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