discrepancy of ns-r diagram between getdist and official plot

Use of Healpix, camb, CLASS, cosmomc, compilers, etc.
Post Reply
Jack Sparrow
Posts: 14
Joined: May 12 2016
Affiliation: HK

discrepancy of ns-r diagram between getdist and official plo

Post by Jack Sparrow » June 06 2017

When I use the getdist to plot the ns-r diagram (base_nrun_r_plikHM_TT_lowTEB_BKP), I found that the r of solid line is almost 0.12,

While in the paper

https://arxiv.org/pdf/1502.01589.pdf

There is a similar plot, Fig.21. There, the corresponding value is around 0.1.

I am curious why there is a difference based on the same data. Can somebody explian? Thanks!!

Antony Lewis
Posts: 1352
Joined: September 23 2004
Affiliation: University of Sussex
Contact:

Re: discrepancy of ns-r diagram between getdist and official

Post by Antony Lewis » June 07 2017

Fig 21 does not marginalize over running.

Jack Sparrow
Posts: 14
Joined: May 12 2016
Affiliation: HK

discrepancy of ns-r diagram between getdist and official plo

Post by Jack Sparrow » June 07 2017

Thanks!! But would you mind being more specific? What do you mean running? What should I do if I want to get a similar figure as Fig.21?

Thanks!

Jason Dossett
Posts: 97
Joined: March 19 2010
Affiliation: The University of Texas at Dallas
Contact:

discrepancy of ns-r diagram between getdist and official plo

Post by Jason Dossett » June 08 2017

Running refers to running of the spectral index (nrun). In the chains you used nrun was varied (and thus could be marginalized over). To produce figure 21, nrun was not varied so the constraints obtained will be slightly different.

Post Reply