Cosmology Lunch: "Geometric and growth rate tests of gravity with the linearised galaxy distribution" Michael Wilson (University of Edinburgh)

December 12, 2016
Thursday, November 17, 2016 - 12:30pm to 1:30pm
PRB M2005
Oval

This talk will outline the consistency of the VIPERS PDR-2 census of the galaxy distribution at z=0.8 with the expansion history and linear growth rate predicted by General Relativity and a Planck (2015) cosmology.  These may be inferred from the observed anisotropy of the galaxy power spectrum, which is sensitive to both the coherent infall of galaxies towards clusters (outflow from voids) and the assumption of an expansion history differing from the true one.

I will then present the results of including a simple density transform prior to the analysis; this tackles the principal cause of non-linearity by down-weighting the most massive structures and extends the validity of theoretical models.  Moreover, this weighting would amplify signatures of modified gravity in ‘shielded’ models and represents a higher-order statistic, which contains information beyond that available to the power spectrum.

Finally, the final data release of the VIPERS spectroscopic survey will be on Nov 18th (http://vipers.inaf.it).  I will detail the characteristics of the survey and describe the breadth of the accompanying clustering analyses.

S M T W T F S
1
 
2
 
3
 
4
 
5
 
6
 
7
 
8
 
9
 
10
 
11
 
12
 
13
 
14
 
15
 
16
 
17
 
18
 
19
 
20
 
21
 
22
 
23
 
24
 
25
 
26
 
27
 
28
 
29
 
30
 
31