Minkowski Brane in Asymptotic dS$_5$ Spacetime without Fine-tuning

TL;DR

This paper explores a 3-brane in a 5D de-Sitter spacetime, showing that a Minkowski solution arises naturally without fine-tuning, with the observed cosmological constant interpreted as 5D curvature.

Contribution

It demonstrates a model where a Minkowski brane exists without fine-tuning in asymptotic dS5 spacetime, linking the cosmological constant to 5D curvature.

Findings

Minkowski solution achieved without fine-tuning

Cosmological constant interpreted as 5D curvature

Natural placement of the 3-brane in the model

Abstract

We discuss properties of a 3-brane in an asymptotic 5-dimensional de-Sitter spacetime. It is found that a Minkowski solution can be obtained without fine-tuning. In the model, the tiny observed positive cosmological constant is interpreted as a curvature of 5-dimensional manifold, but the Minkowski spacetime, where we live, is a natural 3-brane perpendicular to the fifth coordinate axis.