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Dukjae, Jang
초강력 레이저과학 연구단
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An exact solution of the higher-order gravity in standard radiation-dominated era

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Title
An exact solution of the higher-order gravity in standard radiation-dominated era
Author(s)
Yun, Chae-min; Park, Jubin; Cheoun, Myung-ki; Dukjae Jang
Publication Date
2023-02
Journal
Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, v.837
Publisher
Elsevier B.V.
Abstract
We report that the standard evolution of radiation-dominated era (RDE) universe a∝t1/2 is a sufficient condition for solving a sixth order gravitational field equation derived from the Lagrangian containing BRabRab+CRR;cc as well as a polynomial f(R) for a spatially flat radiation FLRW universe. By virtue of the similarity between RabRab and R2 models up to the background order and of the vanishing property of R;cc for H=1/(2t), the analytical solution can be obtained from a special case to general one. This proves that the standard cosmic evolution is valid even within modified gravitational theory involving higher-order terms. An application of this background solution to the tensor-type perturbation reduces the complicated equation to the standard second order equation of gravitational wave. We discuss the possible ways to discriminate the modified gravity model on the observations such as the gravitational wave from the disturbed universe and primordial abundances. © 2022 The Author(s)
URI
https://pr.ibs.re.kr/handle/8788114/13003
DOI
10.1016/j.physletb.2022.137652
ISSN
0370-2693
Appears in Collections:
Center for Relativistic Laser Science(초강력 레이저과학 연구단) > 1. Journal Papers (저널논문)
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