Neutrino generated dynamical dark energy with no dark energy field
E. I. Guendelman, A. B. Kaganovich

TL;DR
This paper proposes a geometrical mechanism where neutrinos induce dynamical dark energy without requiring a dark energy field, resulting in models that can mimic LambdaCDM or exhibit phantom-like behavior.
Contribution
It introduces a novel neutrino-driven dynamical dark energy model based on two measures field theory, avoiding scalar fields and deriving from first principles.
Findings
The model reproduces LambdaCDM-like cosmological dynamics.
It predicts a phantom-like regime with a pseudo-rip scenario.
Neutrinos in voids can drive variable cosmological constant.
Abstract
Dynamical dark energy (DE) phenomenon emerges as a geometrical effect accompanying the cosmological expansion of nonrelativistic fermionic matter. This occurs without the need for any fluid, like e.g. dynamical scalar field (quintessence, cosmon, etc.), and with conventional form of the Einstein equations in contrast to other known geometrical DE models. The phenomenon results from first principles in the framework of the two measures field theory where, in the Einstein frame, both fermion masses and the cosmological constant (CC) turn into functions of the cold fermion density n. This n dependence becomes negligible in regular (laboratory) conditions but it may have an important role in cosmology. In the 4D gravity model where the original action involves only CC and massive fermions without selfinteraction, for different (but wide) regions in the parameter space we have found two…
Peer Reviews
No public reviews on file for this paper yet. If you reviewed it on a platform where reviews are public (OpenReview, ICLR, NeurIPS, ICML), you can paste yours below so the community can read it here.
Videos
No videos yet. Explain this paper in a talk, walkthrough, or lecture? Add one.
