C161 Sections

Online!

Hey all,

I'll be posting videos/images that I show in section on this website as the semester progresses. These might (hopefully) become useful study tools for the final.

Onsi

Section Information

• Sections meet on Tuesdays 11-12 and 4-5 in Campbell 544
• I don't have official office hours but can meet by appointment. Send me an e-mail at
  onsi (at) berkeley.edu
  my office is in Campbell 751A. Take the elevator to the 6th floor then go up the stairs.

Parameters everywhere!

There are very, many, parameters to keep track of in cosmology. They're all interrelated and they all evolve with time. I've generated an animation that follows the time-evolution of the following parameters:

a	The scale factor.
da/dt	The time derivative of the scale factor.
da/dt	The time derivative of the scale factor.
q	The acceleration parameter.
H	The Hubble parameter in km/s/Mpc.
ρ	The densities of the components of the universe in units of proton mass per cubic cm. Black: critical density Red: radiation density Blue: matter density Green: cosmological constant density
Ω	The Ω parameters of the components of the universe. Black: critical density Red: radiation density Blue: matter density Green: cosmological constant density

The x-axis is time in units of Gyrs and the current time and scale factor are indicated in the top left.