Anti-de-Sitter Island-Universes from 5D Standing Waves

TL;DR

This paper presents a 5D standing wave model with ghost scalar fields creating 'islands' of 4D Minkowski space, offering a new localization mechanism for matter fields and a landscape-like multiverse structure.

Contribution

It introduces a novel 5D standing wave solution with nodes acting as isolated 4D universes, providing a new approach to matter localization and multiverse modeling.

Findings

Multiple Minkowski islands with different parameters are formed.

The model supports both finite and infinite island configurations.

Matter fields localize only on the non-oscillating islands.

Abstract

We construct simple standing wave solutions in a 5D space-time with a ghost scalar field. The nodes of these standing waves are 'islands' of 4D Minkowski space-time. For the 5D model with increasing (decreasing) warp factor there are a finite (infinite) number of nodes and thus Minkowski island-universes having different parameters, such as gravitational and cosmological constants. This feature is similar to the assumptions of the landscape models, which postulate a large number of universes with different parameters. This standing wave solution also provides a new localization mechanism - matter fields can reside only on Minkowski 'islands', where the background space-time does not oscillate.