Abstract
We study the stability of static, spherically symmetric solutions of Rastall’s theory in the presence of a scalar field with respect to spherically symmetric perturbations. The analysis of perturbations shows that there arises an inconsistency in the sense that time-dependent perturbations do not exist in any order of perturbation theory, and we can conclude that these solutions are pertubatively stable (though nonperturbative time-dependent solutions are not excluded). Possible reasons for this inconsistency are discussed.
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Notes
The Rastall parameter a is related to the other frequently used parameter \(\lambda \) by \(a = \dfrac{3\lambda -2}{2\lambda -1}\).
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Acknowledgements
J.C. Fabris and O.F. Piattella thank CNPq (Brazil) and FAPES (Brazil) for partial financial support. D.C. Rodrigues was financed in part by the Coordenação de Aperfeitoamento de Pessoal de Nível Superior—Brasil (CAPES)—Finance Code 001. E.C.O. Santos thanks FAPES (Brazil) for financial support. The work of K. Bronnikov was supported by the RUDN University program 5-100 and by the Russian Foundation for Basic Research Project 19-02-00346. The work of K.B. was also performed within the framework of the Center FRPP supported by MEPhI Academic Excellence Project (Contract Nos. 02.a03.21.0005, 27.08.2013).
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Bronnikov, K.A., Fabris, J.C., Piattella, O.F. et al. Rastall’s theory of gravity: spherically symmetric solutions and the stability problem. Gen Relativ Gravit 53, 20 (2021). https://doi.org/10.1007/s10714-021-02791-6
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DOI: https://doi.org/10.1007/s10714-021-02791-6