Non-BPS Brane Cosmology

Abstract

We study cosmology on a BPS D3-brane evolving in the 10D SUGRA background describing a non-BPS brane. Initially the BPS brane is taken to be a probe whose dynamics we determine in the non-compact non-BPS background. The cosmology observed on the brane is of the FRW type with a scale factor $S(\tau )$. In this mirage cosmology approach, there is no self-gravity on the brane which cannot inflate. Self-gravity is then included by compactifying the background space-time. The low energy effective theory below the compactification scale is shown to be bi-metric, with matter coupling to a different metric than the geometrically induced metric on the brane. The geometrical scale factor on the brane is now $S(\tau )a(\tau )$ where $a(\tau )$ arises from brane self-gravity. In this non-BPS scenario the brane generically inflates. We study the resulting inflationary scenario taking into account the fact that the non-BPS brane eventually decays on a time-scale much larger than the typical inflationary time-scale. After the decay, the theory ceases to be bi-metric and COBE normalization is used to estimate the string scale which is found to be of order $10^{14}$ GeV.

20 pages, JHEP3.cls

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• Perturbations on a moving D3-brane and mirage cosmology
• Probe Branes Dynamics: Exact Solutions in General Backgrounds
• The Cosmological Slingshot Scenario: A Stringy Early Times Universe
• Role of Chameleon Field in Accelerating Universe
• Supergravity p-branes revisited: extra parameters, uniqueness, and topological censorship
• Mirage cosmology with an unstable probe D3-brane
• The Cosmological Slingshot Scenario: Myths and Facts
• Mirage Cosmology of U(1) Gauge Field on Unstable D3 Brane Universe
• Brane Isotropisation in Extra-Dimensional Tolman-Bondi Universe