AdS_5 and the 4D Cosmological Constant

TL;DR

This paper explores a 5-dimensional universe with a negative cosmological constant, proposing that our observable 4-dimensional universe is a holographic projection of this higher-dimensional space.

Contribution

It introduces a model linking 5D spacetime with a nonzero cosmological constant to the 4D universe via holography, offering a new perspective on cosmological constant and universe structure.

Findings

The universe may be fundamentally 5-dimensional with negative curvature.

The 4D universe can be viewed as a holographic boundary of the 5D space.

This framework provides insights into the nature of the cosmological constant.

Abstract

The hypothesis is discussed that our universe is really 5--dimensional with a nonzero cosmological constant that produces a large negative curvature. In this scenario, the observable flat 4--dimensional universe is identified with the holographic projection of the 5--dimensional world onto its own boundary.