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arXiv · 1807.09794

De Sitter and Anti-de Sitter branes in self-tuning models

Jewel Kumar Ghosh·Elias Kiritsis·Francesco Nitti·Lukas T. Witkowski
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Abstract

Maximally symmetric curved-brane solutions are studied in dilatonic braneworld models which realise the self-tuning of the effective four-dimensional cosmological constant. It is found that no vacua in which the brane has de Sitter or anti-de Sitter geometry exist, unless one modifies the near-boundary 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 flat-space 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 self-tuning 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 self-stabilisation mechanism. This setup provides an alternative route to realising de Sitter space in string theory.

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Jewel Kumar Ghosh, Elias Kiritsis, Francesco Nitti, Lukas T. Witkowski. 2018-07-25. De Sitter and Anti-de Sitter branes in self-tuning models. https://doi.org/10.1007/jhep11(2018)128

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