Impact of dark energy perturbations on the growth index
We show that in clustering dark energy models the growth index of linear matter perturbations, γ, can be much lower than in Λ CDM or smooth quintessence models and presents a strong variation with redshift. We find that the impact of dark energy perturbations on γ is enhanced if the dark energy equ...
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ri-123456789-308332020-12-06T08:06:43Z Impact of dark energy perturbations on the growth index Batista, Ronaldo Carlotto Dark energy equation We show that in clustering dark energy models the growth index of linear matter perturbations, γ, can be much lower than in Λ CDM or smooth quintessence models and presents a strong variation with redshift. We find that the impact of dark energy perturbations on γ is enhanced if the dark energy equation of state has a large and rapid decay at low redshift. We study four different models with these features and show that we may have 0.33 < γ ( z ) < 0.48 at 0 < z < 3. We also show that the constant γ parametrization for the growth rate, f = d ln δ m / d lna = Ω γ m, is a few percent inaccurate for such models and that a redshift-dependent parametrization for γ can provide about four times more accurate fits for f. 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 ( R ) and clustering dark energy models can present similar values for γ 2020-12-04T20:19:52Z 2020-12-04T20:19:52Z 2014-06-13 article BATISTA, Ronaldo C.. Impact of dark energy perturbations on the growth index. Physical Review D, [S.L.], v. 89, n. 12, p. 123508-123508, 13 jun. 2014. Disponível em: https://journals.aps.org/prd/abstract/10.1103/PhysRevD.89.123508. Acesso em: 02 out. 2020. http://dx.doi.org/10.1103/physrevd.89.123508. 1550-7998 1550-2368 https://repositorio.ufrn.br/handle/123456789/30833 10.1103/PhysRevD.89.123508 en application/pdf American Physical Society |
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English |
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Dark energy equation |
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Dark energy equation Batista, Ronaldo Carlotto Impact of dark energy perturbations on the growth index |
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We show that in clustering dark energy models the growth index of linear matter perturbations, γ, can be much lower than in Λ CDM or smooth quintessence models and presents a strong variation with redshift. We find that the impact of dark energy perturbations on γ is enhanced if the dark energy equation of state has a large and rapid decay at low redshift. We study four different models with these features and show that we may have 0.33 < γ ( z ) < 0.48 at 0 < z < 3. We also show that the constant γ parametrization for the growth rate, f = d ln δ m / d lna = Ω γ m, is a few percent inaccurate for such models and that a redshift-dependent parametrization for γ can provide about four times more accurate fits for f. 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 ( R ) and clustering dark energy models can present similar values for γ |
| format |
article |
| author |
Batista, Ronaldo Carlotto |
| author_facet |
Batista, Ronaldo Carlotto |
| author_sort |
Batista, Ronaldo Carlotto |
| title |
Impact of dark energy perturbations on the growth index |
| title_short |
Impact of dark energy perturbations on the growth index |
| title_full |
Impact of dark energy perturbations on the growth index |
| title_fullStr |
Impact of dark energy perturbations on the growth index |
| title_full_unstemmed |
Impact of dark energy perturbations on the growth index |
| title_sort |
impact of dark energy perturbations on the growth index |
| publisher |
American Physical Society |
| publishDate |
2020 |
| url |
https://repositorio.ufrn.br/handle/123456789/30833 |
| work_keys_str_mv |
AT batistaronaldocarlotto impactofdarkenergyperturbationsonthegrowthindex |
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1773959882498637824 |