Brane cosmological solutions in six-dimensional warped flux compactifications

Abstract

We study cosmology on a conical brane in the six-dimensional Einstein-Maxwell-dilaton system, where the extra dimensions are compactified by a magnetic flux. We systematically construct exact cosmological solutions using the fact that the system is equivalently described by (6+n)-dimensional pure Einstein-Maxwell theory via dimensional reduction. In particular, we find a power-law inflationary solution for a general dilatonic coupling. When the dilatonic coupling is given by that of Nishino-Sezgin chiral supergravity, this reduces to the known solution which is not inflating. The power-law solution is shown to be the late-time attractor. We also investigate cosmological tensor perturbations in this model using the (6+n)-dimensional description. We obtain the separable equation of motion and find that there always exist a zero mode, while tachyonic modes are absent in the spectrum. The mass spectrum of Kaluza-Klein modes is obtained numerically.

12 pages, 2 figures; v2: references added; v3: version published in JCAP

References in corpus (5)

• Standard 4d gravity on a brane in six dimensional flux compactifications
• Scaling Solutions to 6D Gauged Chiral Supergravity
• Scalar mode analysis of the warped Salam-Sezgin model
• Gravity on an extended brane in six-dimensional warped flux compactifications
• A doubly covariant formula of deficit angle and its application to six-dimensional braneworld

Cited by in corpus (14)

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• Induced gravity on intersecting brane-worlds Part II: Cosmology
• The Effective Field Theory of Codimension-two Branes
• Cosmological evolution of regularized branes in 6D warped flux compactifications
• Black Holes on Thin 3-branes of Codimension-2 and their Extension into the Bulk
• Gravitational Wave Constraints on Multi-Brane Inflation
• Modified Friedmann Equation and Inflation in Warped Codimension-two Braneworld
• Supersymmetric codimension-two branes in six-dimensional gauged supergravity
• Instability of brane cosmological solutions with flux compactifications
• Codimension-2 brane inflation
• Curvature corrections to the low energy effective theory in 6D regularized braneworlds
• Conical singularities regularized in warped six-dimensional flux compactification and their induced brane cosmology
• Codimension-2 black hole solutions on a thin 3-brane and their extension into the bulk