De Sitter and Antide Sitter branes in selftuning models
Abstract
Maximally symmetric curvedbrane solutions are studied in dilatonic braneworld models which realise the selftuning of the effective fourdimensional cosmological constant. It is found that no vacua in which the brane has de Sitter or antide Sitter geometry exist, unless one modifies the nearboundary asymptotics of the bulk fields. In the holographic dual picture, this corresponds to coupling the UV CFT to a curved metric (possibly with a defect). Alternatively, the same may be achieved in a flatspace QFT with suitable variable scalar sources. With these ingredients, it is found that maximally symmetric, positive and negative curvature solutions with a stabilised brane position generically exist. The space of such solutions is studied in two different types of realisations of the selftuning framework. In some regimes we observe a large hierarchy between the curvature on the brane and the boundary UV CFT curvature. This is a dynamical effect due to the selfstabilisation mechanism. This setup provides an alternative route to realising de Sitter space in string theory.
 Publication:

Journal of High Energy Physics
 Pub Date:
 November 2018
 DOI:
 10.1007/JHEP11(2018)128
 arXiv:
 arXiv:1807.09794
 Bibcode:
 2018JHEP...11..128G
 Keywords:

 AdSCFT Correspondence;
 Gaugegravity correspondence;
 High Energy Physics  Theory;
 General Relativity and Quantum Cosmology;
 High Energy Physics  Phenomenology
 EPrint:
 55 pages, 18 figures