Jeans Analysis of Bok globules in $f(R)$ gravity

Abstract

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. 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.

arXiv comment22 pages, 1 figure, new version 23.8.2016: added discussion and corrected typos

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• Quantum kinetic theory of Jeans instability in non-minimal matter-curvature coupling gravity
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• Local fragmentation of thin disks in Eddington-inspired gravity