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We prove that all Ricci-flat, spatially spherically symmetric Berwald spacetime structures are either pseudo-Riemannian (Lorentzian), or flat. This insight enables us to formulate a Jebsen-Birkhoff type theorem for Berwald spacetimes.
Externí odkaz:
http://arxiv.org/abs/2306.07866
Phenomenological work in the last few years has provided significant support to the idea that the vacuum energy density (VED) is a running quantity with the cosmological evolution and that this running helps to alleviate the cosmological tensions aff
Externí odkaz:
http://arxiv.org/abs/2301.05205
Publikováno v:
International Journal of Geometric Methods in Modern Physics Vol. 20 No. 11, 2350190 (2023)
We locally classify all SO(3)-invariant 4-dimensional pseudo-Finsler Berwald structures. These are Finslerian geometries which are closest to (spatially, or SO(3))-spherically symmetric pseudo-Riemannian ones - and serve as ansatz to find solutions o
Externí odkaz:
http://arxiv.org/abs/2212.08603
Autor:
Rasouli, Seyed Meraj Mousavi1,2 (AUTHOR) pmoniz@ubi.pt, Cheraghchi, Samira3 (AUTHOR) s_cheraghchi@ut.ac.ir, Moniz, Paulo1 (AUTHOR)
Publikováno v:
Fractal & Fractional. May2024, Vol. 8 Issue 5, p281. 18p.
Publikováno v:
Phys. Let. B, 770, 43, 2017
We have found some analytical cosmological solutions to MOdified Gravity (MOG). These solutions describe different evolutionary epochs of an isotropic and homogeneous universe. During each epoch, the evolution of cosmological perturbation is studied
Externí odkaz:
http://arxiv.org/abs/1704.04161
Akademický článek
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We prove that all Ricci-flat, spatially spherically symmetric Berwald spacetime structures are either pseudo-Riemannian (Lorentzian) ones, or flat. This insight enables us to formulate a Jebsen-Birkhoff type theorem for Berwald spacetimes.
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::ee74bab05c722176f2e62bd101477a6e
http://arxiv.org/abs/2306.07866
http://arxiv.org/abs/2306.07866
Publikováno v:
European Physical Journal C -- Particles & Fields; Jul2023, Vol. 83 Issue 7, p1-48, 48p