Problem set 1 for ASTR/PHYS 328/428: Cosmology and Large-Scale Structure
The Distance Scale Debate: Purists versus Realists
One group (Bonnie, Steph, Phil) are designated Purists and will
defend the absolute distance measures such as the S-Z effect,
gravitational lens time delay, and water maser proper motions.
The other group (Alex, Steve, Micah, Shosahana) are Realists who think
that these absolute distance indicators are all very well, but not
practical or accurate enough to actually use. They will defend the
tried-and-true distance scale ladder, assuming that the distance to
the LMC is known, and stepping out to interesting distances for
measuring H0 by the different secondary techniques.
The 3 auditors can either join a group or be part of the judging panel
on the day of the debate.
Each group will have 15 minutes to state their case (and criticize
their opponents' choice of method), and then another 5 minutes to
respond to their opponents presentation.
You will be judged on how clearly you explain the different methods
and their strengths and weaknesses (this will be particularly
important for the auditors on the judging panel) and how convincingly
you make your case.
Presentations will take place in class on Feb 10.