{"action":"created","issue":{"url":"https://api.github.com/repos/brinckmann/montepython_public/issues/1","repository_url":"https://api.github.com/repos/brinckmann/montepython_public","labels_url":"https://api.github.com/repos/brinckmann/montepython_public/issues/1/labels{/name}","comments_url":"https://api.github.com/repos/brinckmann/montepython_public/issues/1/comments","events_url":"https://api.github.com/repos/brinckmann/montepython_public/issues/1/events","html_url":"https://github.com/brinckmann/montepython_public/issues/1","id":324746155,"number":1,"title":"Question about SDSS DR4 LRG likelihood","user":{"login":"anicola","id":6814201,"avatar_url":"https://avatars0.githubusercontent.com/u/6814201?v=4","gravatar_id":"","url":"https://api.github.com/users/anicola","html_url":"https://github.com/anicola","followers_url":"https://api.github.com/users/anicola/followers","following_url":"https://api.github.com/users/anicola/following{/other_user}","gists_url":"https://api.github.com/users/anicola/gists{/gist_id}","starred_url":"https://api.github.com/users/anicola/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/anicola/subscriptions","organizations_url":"https://api.github.com/users/anicola/orgs","repos_url":"https://api.github.com/users/anicola/repos","events_url":"https://api.github.com/users/anicola/events{/privacy}","received_events_url":"https://api.github.com/users/anicola/received_events","type":"User","site_admin":false},"labels":[],"state":"open","locked":false,"assignee":null,"assignees":[],"milestone":null,"comments":0,"created_at":"2018-05-20T21:58:11Z","updated_at":"2018-05-24T19:58:59Z","closed_at":null,"author_association":"NONE","body":"Hi,\r\n\r\nI have a question regarding the SDSS DR4 LRG likelihood in MontePython. In Tegmark et al., 2006, the nonlinear power spectrum is modeled as \r\nP_gal(k) = (1+Qk^2)/(1+Ak) P_lin(k)\r\nWhen I look at the likelihood code for mPk I cannot find that this factor is taken into account anywhere. Am I right or am I missing something? \r\n\r\nThank you very much for your help!\r\nAll the best,\r\nAndrina"},"comment":{"url":"https://api.github.com/repos/brinckmann/montepython_public/issues/comments/391840092","html_url":"https://github.com/brinckmann/montepython_public/issues/1#issuecomment-391840092","issue_url":"https://api.github.com/repos/brinckmann/montepython_public/issues/1","id":391840092,"user":{"login":"brinckmann","id":15049519,"avatar_url":"https://avatars1.githubusercontent.com/u/15049519?v=4","gravatar_id":"","url":"https://api.github.com/users/brinckmann","html_url":"https://github.com/brinckmann","followers_url":"https://api.github.com/users/brinckmann/followers","following_url":"https://api.github.com/users/brinckmann/following{/other_user}","gists_url":"https://api.github.com/users/brinckmann/gists{/gist_id}","starred_url":"https://api.github.com/users/brinckmann/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/brinckmann/subscriptions","organizations_url":"https://api.github.com/users/brinckmann/orgs","repos_url":"https://api.github.com/users/brinckmann/repos","events_url":"https://api.github.com/users/brinckmann/events{/privacy}","received_events_url":"https://api.github.com/users/brinckmann/received_events","type":"User","site_admin":false},"created_at":"2018-05-24T19:58:59Z","updated_at":"2018-05-24T19:58:59Z","author_association":"OWNER","body":"Hi Andrina,\r\nThe SDSS DR4 LRG likelihood is a legacy likelihood and predates my involvement with MontePython, so I'm not very familiar with it, but I'll try to answer your question. The likelihood itself does not have the non-linear modelling that you mention from the Tegmark paper, so the question is in what way the data has been manipulated and what assumptions have gone into that. I would check that the data is the non-linear power spectrum as expected (rather than a linear power spectrum obtained from the observed non-linear power spectrum), and in that case I would think that you can fit the data using halofit. In any case, I would suggest instead using SDSS DR7 LRG, unless you have some reason for preferring the DR4 one?\r\n\r\nPerhaps a MontePython user who has used the DR4 likelihood can provide better feedback!\r\nBest,\r\nThejs"}}
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