Wednesday Colloquium: Dr. Xavier Hernandez Doring, UNAM - Universidad Nacional Autonoma de Mexico  Add To Calendar

  • Date(s): Wednesday, 10/21 3:00 PM to Wednesday, 10/21 4:00 PM
  • Speaker: Dr. Xavier Hernandez Doring
  • Host: Ursula Perez-Salas
  • Campus Address: 138 SES (Science and Engineering South)

Title: Evidence for Modified Gravity across Astrophysical Scales
Abstract: For any extended theory of gravity where the rotation curves of spiral galaxies are explained through a change in gravity rather than the ad hoc hypothesis of dark matter, a generic dynamical behaviour is expected for pressure supported systems: An outer flattening of the velocity dispersion profile occurring at a characteristic radius, where both the amplitude of this flat velocity dispersion and the radius at which it appears are predicted to show distinct scalings with the total mass of the system. By carefully analysing dynamics of globular clusters, elliptical galaxies and galaxy cluster, we show that the expectations of extended gravity are met, across nine orders in magnitude in mass. This observed scalings are not expected under dark matter cosmology, and would require particular explanations tuned at the scales of each distinct astrophysical systems.

Colloq flyer 10-21 Hernandez Doring