Gravitational waves in dark bubble cosmology

Abstract

In this paper we construct the 5D uplift of 4D gravitational waves in de Sitter cosmology for the brane world scenario based on a nucleated bubble in AdS5. This makes it possible to generalize the connection between the dark bubbles and Vilenkin's quantum cosmology to include gravitational perturbations. We also use the uplift to explain the interpretation of the apparently negative energy contributions in the 4D Einstein equations, which distinguish the dark bubble scenario from Randall-Sundrum. CONTENTSI. Introduction II. Review of the dark bubble model A. Friedmann cosmology B. The general case III. Gravitational waves in a 4D expanding universe A. Flat universe B. Closed universe C. Energy-momentum tensor * ulf.danielsson, daniel.panizo at physics.uu.se † rob.tielemans at kuleuven.be

Over-extremal brane shells from string theory?

“…In[43], the relation between the brane action and junction conditions was explored in a different context.…”