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- W4385890090 abstract "The Friedmann equation, enriched by an additional term that effectively takes on the role of specific dark energy, is demonstrated to serve as an exact solution within the recently proposed gravitational theory named conformal Killing gravity. This theory does not explicitly incorporate dark energy. This finding suggests that there's no necessity to postulate the existence of dark energy as an independent physical entity. The dark energy effectively arising from this theory is characterized by a specific equation of state parameter, denoted as $omega$, which is uniquely determined to be $-5/3$, classifying it as phantom energy. If this effective dark energy is present in a moderate amount, typically around 5% of the total energy density at the present time, and under the assumption of density parameters for matter and the cosmological constant, $Omega_{rm m}sim 0.25$ and $Omega_Lambda sim 0.7$, respectively, the expansion of the universe at low redshifts ($z < 1.5$) can exceed expectations, while the expansion at $z > 1.5$ remains unchanged. This holds the potential to address the Hubble tension problem." @default.
- W4385890090 created "2023-08-17" @default.
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- W4385890090 date "2023-08-15" @default.
- W4385890090 modified "2023-10-16" @default.
- W4385890090 title "Dark energy in conformal Killing gravity" @default.
- W4385890090 doi "https://doi.org/10.48550/arxiv.2308.07634" @default.
- W4385890090 hasPublicationYear "2023" @default.
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