Regular braneworlds with nonlinear bulk-fluids
2021; Springer Science+Business Media; Volume: 81; Issue: 8 Linguagem: Inglês
10.1140/epjc/s10052-021-09558-y
ISSN1434-6052
AutoresIgnatios Antoniadis, Spiros Cotsakis, Ifigeneia Klaoudatou,
Tópico(s)Galaxies: Formation, Evolution, Phenomena
ResumoAbstract We construct a regular five-dimensional brane-world with localised gravity on a flat 3-brane. The matter content in the bulk is parametrised by an analog of a non-linear fluid with equation of state $$p=\gamma \rho ^\lambda $$ p = γ ρ λ between the ‘pressure’ p and the ‘density’ $$\rho $$ ρ dependent on the 5th dimension. For $$\gamma $$ γ negative and $$\lambda >1$$ λ > 1 , the null energy condition is satisfied and the geometry is free of singularities within finite distance from the brane, while the induced four-dimensional Planck mass is finite.
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