{"paper":{"title":"The impact of dark energy perturbations on the growth index","arxiv_id":"1403.2985","primary_cat":"astro-ph.CO","submitted_at":"2014-03-12T15:48:42+00:00","version_compiled":"v2"},"notice":"Every quoted sentence is the authors' text from the arXiv listing abstract. Labels and probabilities are the outputs of classifier-1.13-20260917 on the question bank abstract-p1-20260923, exactly as returned. 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redshift.","hedge":{"p":1.0,"label":"asserted"},"own_p":0.94,"main_claim_p":0.14,"quantitative":false,"quantitative_p":0.15,"role_probabilities":{"gap":0.0,"method":0.0,"result":0.99,"background":0.0,"limitation":0.0,"future_work":0.0,"contribution":0.0,"interpretation":0.01}},{"i":2,"p":0.97,"id":"s2","own":true,"role":"result","text":"We study four different models with these features and show that we may have $0.33<\\gamma\\left(z\\right)<0.48$ at $0<z<3$.","hedge":{"p":0.88,"label":"hedged_possibility"},"own_p":0.96,"main_claim_p":0.23,"quantitative":true,"quantitative_p":0.99,"role_probabilities":{"gap":0.0,"method":0.0,"result":0.97,"background":0.0,"limitation":0.0,"future_work":0.0,"contribution":0.03,"interpretation":0.0}},{"i":3,"p":0.98,"id":"s3","own":true,"role":"result","text":"We also show that the constant $\\gamma$ parametrization for the growth rate, $f=d\\ln\\delta_{m}/d\\ln a=\\Omega_{m}^{\\gamma}$, is a few percent inaccurate for such models and that a redshift dependent parametrization for $\\gamma$ can provide about four times more accurate fits for $f$.","hedge":{"p":1.0,"label":"asserted"},"own_p":0.93,"main_claim_p":0.13,"quantitative":true,"quantitative_p":0.99,"role_probabilities":{"gap":0.0,"method":0.0,"result":0.98,"background":0.0,"limitation":0.0,"future_work":0.0,"contribution":0.0,"interpretation":0.02}},{"i":4,"p":0.46,"id":"s4","own":true,"role":"interpretation","text":"We discuss the robustness of the growth index to distinguish between General Relativity with clustering dark energy and modified gravity models, finding that some $f\\left(R\\right)$ and clustering dark energy models can present similar values for 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