The pattern of growth in viable f(R) cosmologies

By Levon Pogosian, A. Silvestri. 2007

270 citations recorded by the source corpus.

We study the evolution of linear perturbations in metric f(R) models of gravity and identify a potentially observable characteristic scale-dependent pattern in the behavior of cosmological struc- tures. While at the background level viable f(R) models must closely mimicCDM, the differences in their prediction for the growth of large scale structures can be sufficiently large to be seen with future weak lensing surveys. While working in the Jordan frame, we perform an analytical study of the growth of structures in the Einstein frame, demonstrating the equivalence of the dynamics in the two frames. We also provide a physical interpretation of the results in terms of the dynamics of an effective dark energy fluid with a non-zero shear. We find that the growth of structure in f(R) is enhanced, but that there are no small scale instabilities associated with the additional attractive "fifth force". We then briefly consider some recently proposed observational tests of modified gravity and their utility for detecting the f(R) pattern of structure growth.

View Paper: https://www.semanticscholar.org/paper/1e2f703fd215def7a3804fa5504f9960b1604ac6

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Citations in the corpus

f(R) Theories (2010, background): “The existence of the latter phase gives rise to the modification to the matter power spectrum [146, 74, 544, 526, 251] (see also [597, 493, 494, 94, 446, 278, 435] for related works).”
f(R) Theories Of Gravity (2008, background): “…gravity with cosmic microwave background data (Amendola and Tsujikawa, 2008; Appleby and Battye, 2007; Carloni et al., 2008b; Hu and Sawicki, 2007b; Li and Barrow, 2007; Li et al., 2007a; Pogosian and Silvestri, 2008; Starobinsky, 2007; Tsujikawa, 2008; Tsujikawa et al., 2008; Wei and Zhang, 2008).”