Cosmic flows crank up the tension in cosmology

Event Date:
2021-01-25T15:00:00
2021-01-25T16:00:00
Event Location:
Connect via zoom
Speaker:
Mike Hudson (Waterloo)
URL:
Zoom link
Related Upcoming Events:
Astronomy Colloquia
Intended Audience:
Undergraduate
Local Contact:

Douglas Scott

Event Information:

Peculiar velocities - deviations from Hubble expansion - are the only practical probe of the growth of matter density fluctuations on very large scales in the nearby Universe.  I will discuss recent measurements of cosmological parameters based on our approach of predicting peculiar velocities from the density field. This yields interesting results for the rms density fluctuations on 8 Mpc/h scales and their growth rate that may require new physics beyond the standard Lambda Cold Dark Matter model.

Add to Calendar 2021-01-25T15:00:00 2021-01-25T16:00:00 Cosmic flows crank up the tension in cosmology Event Information: Peculiar velocities - deviations from Hubble expansion - are the only practical probe of the growth of matter density fluctuations on very large scales in the nearby Universe.  I will discuss recent measurements of cosmological parameters based on our approach of predicting peculiar velocities from the density field. This yields interesting results for the rms density fluctuations on 8 Mpc/h scales and their growth rate that may require new physics beyond the standard Lambda Cold Dark Matter model. Event Location: Connect via zoom