Neutrino masses, the cosmological constant and a stable universe in a Randall-Sundrum scenario

TL;DR

This paper explores how introducing bulk neutrinos in the Randall-Sundrum model can stabilize the universe and connect neutrino masses with a small cosmological constant, reducing the need for fine-tuning.

Contribution

It demonstrates that bulk neutrinos can restrict the cosmological constant's magnitude, linking neutrino physics, universe stability, and cosmological constant issues in a novel way.

Findings

Bulk neutrinos limit the cosmological constant to small values.

Neutrino masses are explained within the warped geometry framework.

A stable TeV-brane configuration is achieved with the proposed setup.

Abstract

The Randall-Sundrum model of warped geometry in a five-dimensional scenario, aimed at explaining the hierarchy between the Planck and electroweak scales, is intrinsically unstable in its minimal form due to negative tension of the visible brane. A proposed solution to the problem yields a negative cosmological constant in four dimensions. We show that this wrong-sign cosmological constant is restricted to small values, therefore requiring less cancellation from hitherto unknown physics, if bulk neutrinos are postulated to explain the observed neutrino mass pattern. Thus neutrino masses, a stable Tev-brane configuration and new physics in the context of the cosmological constant get rather suggestively connected by the same thread.