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Friedmann branes with variable tension

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arxiv 0806.3857 v3 pith:UMFIVPJH submitted 2008-06-24 gr-qc astro-phhep-th

classification gr-qcastro-phhep-th
keywords tensionbranebranesdimensionalembeddedfluidfriedmannspace-time
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We introduce brane-worlds with non-constant tension, strenghtening the analogy with fluid membranes, which exhibit a temperature-dependence according to the empirical law established by E\"otv\"os. This new degree of freedom allows for evolving gravitational and cosmological constants, the latter being a natural candidate for dark energy. We establish the covariant dynamics on a brane with variable tension in full generality, by considering asymmetrically embedded branes and allowing for non-standard model fields in the 5-dimensional space-time. Then we apply the formalism for a perfect fluid on a Friedmann brane, which is embedded in a 5-dimensional charged Vaidya-Anti de Sitter space-time.

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Cited by 1 Pith paper

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  1. Unifying Cosmic Epochs via Quantum-Corrected Expansion with Brane-World Parallels

    hep-th 2025-05 reject novelty 4.0 of 10

    A single analytical scale factor with sigmoid-smoothed parameters is proposed to interpolate between inflation, radiation, matter, and dark-energy epochs.

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