Speaker: Khaled Said Soliman
Affiliation: University of Queensland
Abstract
The deviation of a galaxy velocity from the mean value set by the expansion of the universe (Hubble’s Law) at its position is called peculiar velocity. These peculiar velocities refer to the gravitational pull of growing structures such as clusters of galaxies and superclusters. Peculiar velocities provide a unique way to test theories of gravity at low redshift, a scale untouched by alternative methods. I will present our most recent results of measuring peculiar velocities for 15k galaxies in the local universe via something called distance indicator. I will show how we use these peculiar velocities to constrain the growth rate of the structure which is a unique observational way to distinguish GR from alternative gravity theories. I will also show a comparison between our recent measurement and other low and high redshift probes. I will briefly talk about current and future peculiar velocity surveys.
About Physics Seminars
The weekly Physics Seminar series focuses on a broad range of physics research within SMP, along with frequent presentations from visiting researchers. Seminars are usually scheduled for 1.00pm on Tuesdays.
The talks are typically more specialised than a colloquium but are often attended by staff and PhD students across a broad range of areas. Speakers are thus encouraged to include introductory material in the talks.
All SMP researchers and HDR students are encouraged to speak. Please email Lewis Williamson to register your interest.
The seminars are open so there is no need to register your attendance.