Speaker
Description
Real-time measurements are becoming feasible in cosmology, where the next generation of telescopes such as the Square Kilometer Array and the Extremely Large Telescope will detect the temporal change of redshifts of individual sources with a precision that will allow a direct detection of the cosmic expansion rate. These detections of cosmic drifts of redshifts are likely to become cornerstones in modern cosmology, where one has otherwise relied on the indirect inference of cosmic expansion by estimation of the slope of the fitted distance-redshift relation. Because of the direct inference of the cosmic time-evolution that is in principle possible with redshift drift, it is a powerful model-independent probe of the kinematics of the Universe. I will present formalism relevant for analysing redshift drift measurements model-independently, i.e., free of any explicit metric assumption. I will explain how one can use redshift drift observations to (almost) model-independently test for violations of the strong energy condition.
