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Capozziello, S., Nojiri, S., Odintsov, S.D. and Troisi, A. (2006) Cosmological Viability of f(R)-Gravity as an Ideal Fluid and Its Compatibility with a Matter Dominated Phase. Physics Letters B, 639, 135-143.
https://doi.org/10.1016/j.physletb.2006.06.034

has been cited by the following article:

• TITLE: Energy Conditions in Palatini Approach to Modified f(R) Gravity

  AUTHORS: Hamidreza Saiedi

  KEYWORDS: Modified Gravity, Palatini Formalism, Energy Conditions

  JOURNAL NAME: Journal of High Energy Physics, Gravitation and Cosmology, Vol.6 No.4, September 29, 2020

  ABSTRACT: In this paper, we review modified f(R) theories of gravity in Palatini formalism. In this framework, we use the Raychaudhuri’s equation along with the requirement that the gravity is attractive, which holds for any geometrical theory of gravity to discuss the energy conditions. Then, to derive these conditions, we obtain an expression for effective pressure and energy density by considering FLRW metric. To simply express the energy conditions, we write the Ricci scalar and its derivatives in terms of the deceleration (q), jerk (j) and snap (s) parameters. Energy conditions derived in Palatini version of f(R) Gravity differ from those derived in GR. We will see that the WEC (weak energy condition) derived in Palatini formalism has exactly the same expression in its metric approach.