Cosmology seminar - Caroline Guandalin

Studies of our motion with respect to the distribution of matter on large scales have found discrepancies in our peculiar velocity regarding results obtained from the cosmic microwave background (CMB). These findings raise questions about the Cosmological Principle, a fundamental concept that suggests our velocity should be the same in both the CMB and matter reference frames. In this talk, I will explore the quasar luminosity function (QLF), which describes how quasars are distributed in terms of distance and brightness, and how different QLF models impact the kinematic dipole. I will also discuss how neglecting the dipole evolution over time may impact the expected dipole amplitude, which in turns leads to different estimates of our peculiar velocity. Finally, I will explain how this time evolution can provide us with new opportunities to constrain cosmological parameters.