Difference between revisions of "W and gamma"
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(''Nick writing on behalf of Mat'') | (''Nick writing on behalf of Mat'') | ||
| − | From the sigma8(z) constraints posted | + | From the sigma8(z) constraints posted ([[SZ_s8_z |sigma 8 of z constraints link]]), we looked into how well we can constrain w and delta gamma, where delta gamma quantifies a departure from the GR growth rate gamma (see [https://arxiv.org/pdf/1201.2434.pdf Weinberg et al. 2012]). |
| − | [[File:s8resTP.png | + | [[File:s8resTP.png]] |
| − | Temperature plus polarization CMB Halo mass calibration | + | Temperature plus polarization CMB Halo mass calibration. |
| + | The error bands are for z-bins of width 0.1 | ||
| − | [[File:s8resP.png | + | [[File:s8resP.png]] |
Polarization only CMB Halo mass calibration | Polarization only CMB Halo mass calibration | ||
| − | + | gamma = 0.55 + 0.05(1 + w) and Delta gamma equivalent to 0.05(1 + w) so w = -0.8 corresponds to delta gamma 0.01. | |
| + | |||
| + | Note that a lot of the constraint for w (and mnu) is just coming from pinning down sigma8 today. Not so much from knowing its z dependence. Although if there were some motivation for a general w(z) or delta gamma (z), those would be better constrained by this. | ||
Latest revision as of 11:10, 15 March 2017
(Nick writing on behalf of Mat)
From the sigma8(z) constraints posted (sigma 8 of z constraints link), we looked into how well we can constrain w and delta gamma, where delta gamma quantifies a departure from the GR growth rate gamma (see Weinberg et al. 2012).
Temperature plus polarization CMB Halo mass calibration. The error bands are for z-bins of width 0.1
Polarization only CMB Halo mass calibration
gamma = 0.55 + 0.05(1 + w) and Delta gamma equivalent to 0.05(1 + w) so w = -0.8 corresponds to delta gamma 0.01.
Note that a lot of the constraint for w (and mnu) is just coming from pinning down sigma8 today. Not so much from knowing its z dependence. Although if there were some motivation for a general w(z) or delta gamma (z), those would be better constrained by this.
