SANTA BARBARA, Calif.— It is among the most talked-about problems in physics: 2 measurements of deep space’s growth rate disagree. Now, a strategy that intended to fix the inequality has actually produced a 3rd price quote that falls in between the previous 2. So the debate sustains, researchers report in a research study accepted in the Astrophysical Journal
One measurement of how quickly deep space is broadening– a number referred to as the Hubble constant– originates from supernovas, or taking off stars. Another is based upon the cosmic microwave background, the light launched soon after the Big Bang. Previous supernova measurements show that deep space is broadening at a rate of about 74 kilometers per 2nd per megaparsec, or about 3.3 million light-years. However the cosmic microwave background pegs that number at around 67 kilometers per 2nd per megaparsec.
That distinction has actually led some scientists to recommend that we’re missing out on something essential in our understanding of deep space, such as brand-new, unknown subatomic particles that may live in the universes ( SN: 8/6/16, p. 10).
In the brand-new research study, cosmologist Wendy Freedman of the University of Chicago and coworkers made another measurement of the Hubble constant that likewise counts on supernovas. Researchers identify how quickly deep space is broadening by determining how the supernovas’ light is extended to redder wavelengths by that growth. However that needs a quote of how far those supernovas are from Earth.