Inflationary Cosmology in Modified Gravity Theories
Leading Graduate School Promotion Center, Ochanomizu University, Tokyo 112-8610, Japan
Department of Physics, Graduate School of Humanities and Sciences, Ochanomizu University, Tokyo 112-8610, Japan
Consejo Superior de Investigaciones Científicas, ICE/CSIC-IEEC, Campus UAB, Facultat de Ciències, Torre C5-Parell-2a pl, E-08193 Bellaterra (Barcelona), Spain
Institució Catalana de Recerca i Estudis Avançats (ICREA), Passeig Lluís Companys,23-08010 Barcelona, Spain
Tomsk State Pedagogical University, 634061 Tomsk, Russia
Author to whom correspondence should be addressed.
Academic Editor: Yasunori Nomura
Received: 7 February 2015 / Revised: 27 February 2015 / Accepted: 2 March 2015 / Published: 9 March 2015
We review inflationary cosmology in modified gravity such as R2
gravity with its extensions in order to generalize the Starobinsky inflation model. In particular, we explore inflation realized by three kinds of effects: modification of gravity, the quantum anomaly, and the R2
term in loop quantum cosmology. It is explicitly demonstrated that in these inflationary models, the spectral index of scalar modes of the density perturbations and the tensor-to-scalar ratio can be consistent with the Planck results. Bounce cosmology in F(R)
gravity is also explained.
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MDPI and ACS Style
Bamba, K.; Odintsov, S.D. Inflationary Cosmology in Modified Gravity Theories. Symmetry 2015, 7, 220-240.
Bamba K, Odintsov SD. Inflationary Cosmology in Modified Gravity Theories. Symmetry. 2015; 7(1):220-240.
Bamba, Kazuharu; Odintsov, Sergei D. 2015. "Inflationary Cosmology in Modified Gravity Theories." Symmetry 7, no. 1: 220-240.
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