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Jeans analysis of Bok globules in f(R) gravity
Tekijät: Vainio J, Vilja I
Kustantaja: SPRINGER/PLENUM PUBLISHERS
Julkaisuvuosi: 2016
Journal: General Relativity and Gravitation
Tietokannassa oleva lehden nimi: GENERAL RELATIVITY AND GRAVITATION
Lehden akronyymi: GEN RELAT GRAVIT
Artikkelin numero: ARTN 129
Vuosikerta: 48
Numero: 10
Sivujen määrä: 20
ISSN: 0001-7701
eISSN: 1572-9532
DOI: https://doi.org/10.1007/s10714-016-2120-8
Tiivistelmä
We examine the effects of f(R) gravity on Jeans analysis of collapsing dust clouds. We provide a method for testing modified gravity models by their effects on star formation as the presence of f(R) gravity is found to modify the limit for collapse. In this analysis we add perturbations to a de Sitter background. As the standard Einstein-Hilbert Lagrangian is modified, new types of dynamics emerge. Depending on the characteristics of a chosen f(R) model, the appearance of new limits is possible. The physicality of these limits is further examined. We find the asymptotic Jeans masses for f(R) theories compared to standard Jeans mass. Through this ratio, the effects of the f(R) modified Jeans mass for viable theories are examined in molecular clouds. Bok globules have a mass range comparable to Jeans masses in question and are therefore used for comparing different f(R) models. Viable theories are found to assist in star formation.
We examine the effects of f(R) gravity on Jeans analysis of collapsing dust clouds. We provide a method for testing modified gravity models by their effects on star formation as the presence of f(R) gravity is found to modify the limit for collapse. In this analysis we add perturbations to a de Sitter background. As the standard Einstein-Hilbert Lagrangian is modified, new types of dynamics emerge. Depending on the characteristics of a chosen f(R) model, the appearance of new limits is possible. The physicality of these limits is further examined. We find the asymptotic Jeans masses for f(R) theories compared to standard Jeans mass. Through this ratio, the effects of the f(R) modified Jeans mass for viable theories are examined in molecular clouds. Bok globules have a mass range comparable to Jeans masses in question and are therefore used for comparing different f(R) models. Viable theories are found to assist in star formation.
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