{"action":"created","issue":{"url":"https://api.github.com/repos/MP-Gadget/MP-Gadget/issues/211","repository_url":"https://api.github.com/repos/MP-Gadget/MP-Gadget","labels_url":"https://api.github.com/repos/MP-Gadget/MP-Gadget/issues/211/labels{/name}","comments_url":"https://api.github.com/repos/MP-Gadget/MP-Gadget/issues/211/comments","events_url":"https://api.github.com/repos/MP-Gadget/MP-Gadget/issues/211/events","html_url":"https://github.com/MP-Gadget/MP-Gadget/issues/211","id":313014007,"node_id":"MDU6SXNzdWUzMTMwMTQwMDc=","number":211,"title":"Linear growth of individual species","user":{"login":"Chris-Pedersen","id":16047009,"node_id":"MDQ6VXNlcjE2MDQ3MDA5","avatar_url":"https://avatars0.githubusercontent.com/u/16047009?v=4","gravatar_id":"","url":"https://api.github.com/users/Chris-Pedersen","html_url":"https://github.com/Chris-Pedersen","followers_url":"https://api.github.com/users/Chris-Pedersen/followers","following_url":"https://api.github.com/users/Chris-Pedersen/following{/other_user}","gists_url":"https://api.github.com/users/Chris-Pedersen/gists{/gist_id}","starred_url":"https://api.github.com/users/Chris-Pedersen/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/Chris-Pedersen/subscriptions","organizations_url":"https://api.github.com/users/Chris-Pedersen/orgs","repos_url":"https://api.github.com/users/Chris-Pedersen/repos","events_url":"https://api.github.com/users/Chris-Pedersen/events{/privacy}","received_events_url":"https://api.github.com/users/Chris-Pedersen/received_events","type":"User","site_admin":false},"labels":[],"state":"open","locked":false,"assignee":null,"assignees":[],"milestone":null,"comments":21,"created_at":"2018-04-10T17:12:37Z","updated_at":"2018-07-24T18:50:44Z","closed_at":null,"author_association":"CONTRIBUTOR","body":"This is in the same vein of what we've been emailing about but an issue might make it easier to discuss. We're looking at confirming the linear growth by running some sims with very low A_s, and comparing the results to CAMB. If we ignore the neutrino case for now, and just consider the growth of individual species with DifferentTransfersOn = 1, when comparing the power with the CAMB prediction for that species, we get (with ICs at z=99):\r\n\r\n![z99_diffon_nu0](https://user-images.githubusercontent.com/16047009/38572106-15fa0818-3cea-11e8-9811-72bf96df4f5e.png)\r\n![z3_diffon_nu0](https://user-images.githubusercontent.com/16047009/38572110-18fe8692-3cea-11e8-88dd-952cef5dc8a8.png)\r\n\r\n\r\nIt looks as though the species themselves aren't quite evolving in agreement with linear theory, but doing so in such a way that the total matter looks ok. This is with StarFormation on, currently rerunning with it off and I'll update if this makes a signifcant difference. Paramfiles are:\r\n\r\n\r\n[params_ini.txt](https://github.com/rainwoodman/MP-Gadget/files/1895691/params_ini.txt)\r\n[paramfile_genic.txt](https://github.com/rainwoodman/MP-Gadget/files/1895692/paramfile_genic.txt)\r\n[paramfile_gadget.txt](https://github.com/rainwoodman/MP-Gadget/files/1895693/paramfile_gadget.txt)\r\n"},"comment":{"url":"https://api.github.com/repos/MP-Gadget/MP-Gadget/issues/comments/407513465","html_url":"https://github.com/MP-Gadget/MP-Gadget/issues/211#issuecomment-407513465","issue_url":"https://api.github.com/repos/MP-Gadget/MP-Gadget/issues/211","id":407513465,"node_id":"MDEyOklzc3VlQ29tbWVudDQwNzUxMzQ2NQ==","user":{"login":"rainwoodman","id":138060,"node_id":"MDQ6VXNlcjEzODA2MA==","avatar_url":"https://avatars0.githubusercontent.com/u/138060?v=4","gravatar_id":"","url":"https://api.github.com/users/rainwoodman","html_url":"https://github.com/rainwoodman","followers_url":"https://api.github.com/users/rainwoodman/followers","following_url":"https://api.github.com/users/rainwoodman/following{/other_user}","gists_url":"https://api.github.com/users/rainwoodman/gists{/gist_id}","starred_url":"https://api.github.com/users/rainwoodman/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/rainwoodman/subscriptions","organizations_url":"https://api.github.com/users/rainwoodman/orgs","repos_url":"https://api.github.com/users/rainwoodman/repos","events_url":"https://api.github.com/users/rainwoodman/events{/privacy}","received_events_url":"https://api.github.com/users/rainwoodman/received_events","type":"User","site_admin":false},"created_at":"2018-07-24T18:50:44Z","updated_at":"2018-07-24T18:50:44Z","author_association":"COLLABORATOR","body":"Did you use the hydro smoothing length for the grav smoothing of baryons?\r\n\r\nThe hydro smoothing length is shorter than the grav smoothing length near halos and larger in voids.\r\n\r\nThis could explain why growth of baryon and dm diverges. \r\n"}}
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