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Simultaneously solving the H0 and σ8 tensions with late dark energy by Lavinia Heisenberg; Hector Villarrubia-Rojo; Jann Zosso is a Physics and Astronomy article available to read on EtoBox.

What is Simultaneously solving the H0 and σ8 tensions with late dark energy about?

In a model independent approach, we derive generic conditions that any late time modification of the Λ CDM expansion history must satisfy in order to consistently solve both the H 0 and the σ 8 tensions. Our results are fully analytical and the method is merely based on the assumption that the late-time deviations from Λ CDM remain small. For the concrete case of a dark energy fluid with deviations encoded in the expansion history and the gravitational coupling constant, we present necessary conditions on its equation of state. Solving both the H 0 and σ 8 tensions requires that w ( z ) must cross the phantom divide if G eff = G . On the other hand, for G eff = G + δ G ( z ) and w ( z ) ≤ − 1 , it is required that δ G ( z ) G < α ( z ) δ H ( z ) H ( z ) < 0 at some redshift z .

Who reads Simultaneously solving the H0 and σ8 tensions with late dark energy?

Author

Lavinia Heisenberg; Hector Villarrubia-Rojo; Jann Zosso

Publisher

Elsevier BV

Published

2023

Language

EN

Field

Physics and Astronomy (Physical Sciences)