Abstract
We consider nonlocal modified Einstein gravity without matter, where nonlocal term has the form \(P(R) \mathcal {F}(\Box ) Q(R)\). For this model, in this paper we give the derivation of the equations of motion in detail. This is not an easy task and presented derivation should be useful to a researcher who wants to investigate nonlocal gravity. Also, we present the second variation of the related Einstein–Hilbert modified action and basics of gravity perturbations.
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Acknowledgements
Work on this paper was partially supported by the Ministry of Education, Science and Technological Development of Republic of Serbia, grant No 174012. B.D. thanks Prof. Vladimir Dobrev for invitation to participate and give a talk on nonlocal gravity, as well as for hospitality, at the X International Symposium “Quantum Theory and Symmetries”, and XII International Workshop “Lie Theory and its Applications in Physics”, 19–25 June 2017, Varna, Bulgaria. B.D. also thanks a support of the ICTP - SEENET-MTP project NT-03 Cosmology-Classical and Quantum Challenges during preparation of this article.
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Dimitrijevic, I., Dragovich, B., Rakic, Z., Stankovic, J. (2018). Variations of Infinite Derivative Modified Gravity. In: Dobrev, V. (eds) Quantum Theory and Symmetries with Lie Theory and Its Applications in Physics Volume 1 . LT-XII/QTS-X 2017. Springer Proceedings in Mathematics & Statistics, vol 263. Springer, Singapore. https://doi.org/10.1007/978-981-13-2715-5_5
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DOI: https://doi.org/10.1007/978-981-13-2715-5_5
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