A measurement of the cosmic expansion within our lifetime

The most exciting future observation in cosmology will feature a monitoring of the cosmic expansion in real time, unlike anything that has ever been attempted before. This campaign will uncover crucial physical properties of the various constituents in the universe, and perhaps answer a simpler question concerning whether or not the cosmic expansion is even accelerating. An unambiguous yes/no response to this query will significantly impact cosmology, of course, but also the standard model of particle physics. Here, we discuss-in a straightforward way-how to understand the so-called 'redshift drift' sought by this campaign, and why its measurement will help us refine the standard-model parameters if the answer is 'yes.' A 'no' answer, on the other hand, could be more revolutionary, in the sense that it might provide a resolution of several long-standing problems and inconsistencies in our current cosmological models. An outcome of zero redshift drift, for example, would obviate the need for a cosmological constant and render inflation completely redundant.

Automated summary

The future observation of real-time cosmic expansion is an exciting research that can reveal the properties of the universe and answer the question of whether the cosmic expansion is accelerating. It has significant impacts on cosmology and the standard model of particle physics.