Galaxy clustering

Question 1

Bias: what?

Answer 1

Caused by processes that lead to dm and baryons not aligning

Question 2

Causes of bias

Answer 2

High-mass halos cluster more than low mass.
Easier to collapse haloes in regions of already high overdensity, so you find more galaxies there. galaxy biasing
Peak density and mass overdensity are not the same. Peak density includes the background?
Halos of a given mass are more biased at higher redshift.

Question 3

Measure of galaxy clustering:

Answer 3

ksi(r_m)=sigma(r_m)^2, or estimator

Question 4

Kaiser effect

Answer 4

Squished correlation function because of infalling to a large mass

Question 5

Fingers of god

Answer 5

Virialized halos have increased Vpec, affecting the redshift. This leads to elongation in the density function in redshift

Question 6

BAO

Answer 6

‘released at teq’ frozen structure. Comoving peak position does not change, physical size only affected by expansion because these things are so large.