Everything you didn’t want to know about WIMPy dark matter but have been forced to find out.
Lectures on Dark Matter Physics
These series of lectures, first given at the TASI 2015 summer school, provide an introduction to the
basics of dark matter physics. They are geared for the advanced undergraduate or graduate student
interested in pursuing research in high-energy physics. The primary goal is to build an understanding
of how observations constrain the assumptions that can be made about the astro- and particle
physics properties of dark matter. The lectures begin by delineating the basic assumptions that can
be inferred about dark matter from rotation curves. A detailed discussion of thermal dark matter
follows, motivating Weakly Interacting Massive Particles, as well as lighter-mass alternatives. As
an application of these concepts, the phenomenology of direct and indirect detection.
Direct detection (see Figure 8) is through scattering of WIMPs off atomic nuclei. These searches often share facilities with neutrino observatories.
Indirect detection is looking for gamma rays given off when two WIMPs collide in places in the universe where large concentrations of dark matter are found.
The three most often-cited challenges to cold dark matter (CDM) are: (1) The Missing Satellites
Problem where N-body simulations predict more satellite galaxies in orbit around the Milky Way
than are actually observed. (2) The Cusp/Core Controversy where some data from dwarf galaxies
point to a shallow central slope of the density profile, not recovered in DM-only N-body simulations.
(3) The Too Big to Fail Problem in which we do not observe dwarf galaxies that are as large
as the ones found in simulations.
You may also find this website undergoing dark matter search interesting:
Super Cryogenic Dark Matter Search
It’s interesting for two reasons. It’s the only dark matter search that is also looking for lightweight WIMPs (below 10 GeV/c^2)
It’s the only dark matter search looking for WIMPs with low fractional charges (<1/6 of an electron).