Matter instability in modified gravity

By Valerio Faraoni. 2006

202 citations recorded by the source corpus.

The Dolgov-Kawasaki instability discovered in the matter sector of the modified gravity scenario incorporating a 1/R correction to Einstein gravity is studied in general f(R) theories. A stability condition is found in the metric version of these theories to help ruling out models that are unviable from the theoretical point of view.

Subfields: Astronomy and Astrophysics, Nuclear and High Energy Physics

View Paper: https://www.semanticscholar.org/paper/472c69e198d52d2039d3a12badf9ea8ba260649d

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In Astronomy and Astrophysics

In Nuclear and High Energy Physics

Citations in the corpus

Modified Gravity and Cosmology (2011, background): “For more general theories it can be shown that the effective mass squared in the relevant scalar field equation takes the same sign as fRR [485].”
f(R) Theories Of Gravity (2008, background): “The analysis of this instability is generalized to arbitrary f(R) theories in the metric formalism in the following way (Faraoni, 2006a).”
f(R) Theories (2010, background): “However, this model suffers from a number of problems such as matter instability [215, 244], the instability of cosmological perturbations [146, 74, 544, 526, 251], the absence of the matter era [28, 29, 239], and the inability to satisfy local gravity constraints [469, 470, 245, 233, 154, 448, 134]”