Dynamical Dark Energy and Infinite Statistics

Abstract

In the ΛCDM model, dark energy is viewed as a constant vacuum energy density, the cosmological constant in the Einstein-Hilbert action. This assumption can be relaxed in various models that introduce a dynamical dark energy. In this letter, we argue that the mixing between infrared and ultraviolet degrees of freedom in quantum gravity lead to infinite statistics, the unique statistics consistent with Lorentz invariance in the presence of non-locality, and yield a fine structure for dark energy. Introducing IR and UV cutoffs into the quantum gravity action, we deduce the form of Λ as a function of redshift and translate this to the behavior of the Hubble parameter.

Quantum Gravity and Phenomenology: Dark Matter, Dark Energy, Vacuum Selection, Emergent Spacetime, and Wormholes

“…the H 0 -tension [33], has placed the Λ-CDM model under intensified scrutiny. Recently, we have pointed out that quantum gravity, realized in terms of a general string theory, leads to a dynamical dark energy [34], which, in turn, may illuminate the H 0 -tension [35]. This work is a follow-up to the more general discussion of the question "how to find de Sitter space in string theory."…”