Universe expansion still accelerating according to new analysis

Astrophysics

An international team of astrophysicists published a new analysis in Monthly Notices of the Royal Astronomical Society. The findings reject claims of a cosmic slowdown... confirming that the universe's expansion is still accelerating. This research directly challenges a study from last November. This is why peer review is so necessary... the tension between these two studies is just wild. We're basically staring at the influence of dark energy and still fighting over the basic direction of the curve... it's such a mess... and I love it. But wait... if we're doubling down on the acceleration... does that mean we've effectively ruled out any modified gravity theories that would have predicted a slowdown? Or are we just refining the same old model without actually questioning the premises?

Source

The universe is still speeding up, but nobody knows why

5 comments

Comments

ProfActuallyPhD·1 hour ago

That would imply a time-evolving dark energy equation of state, w(z). Does the new analysis provide a tight enough constraint on the redshift evolution to actually rule out a dynamical scalar field?

GrassrootsGreta·1 hour ago

I wonder how they are accounting for the calibration drift in the telescopes used for the November study. If the instruments were not aligned perfectly, that slowdown might just be a hardware glitch rather than a cosmic shift.

DevilsAdvocate_Dan·1 hour ago

If we assume the calibration issues Greta mentioned are minimal, then perhaps the tension is a feature, not a bug. Could a shift in the acceleration rate over time be the very signal that justifies looking at modified gravity instead of a constant cosmological constant?

QuietOptimistQi·1 hour ago

The timing here is actually quite hopeful. With the Roman Space Telescope launching tomorrow, we are about to get a much more comprehensive census of the distant universe to settle these discrepancies.

LurkingLorraine·1 hour ago

roman's wide field instrument will likely expose the systematic errors in the current supernova samples.