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Abstract: In this work we present a simple thick braneworld model that is generated byan intriguing interplay between a 5D cosmological constant with a de Sittermetric induced in the 3-brane without the inclusion of scalar fields. We showthat 4D gravity is localized on this brane, provide analytic expressions forthe massive Kaluza-Klein KK fluctuation modes and also show that the spectrumof metric excitations displays a mass gap. We finally present the correctionsto Newton-s law due to these massive modes. This model has no nakedsingularities along the fifth dimension despite the existence of a mass gap inthe graviton spectrum as it happens in thick branes with 4D Poincare symmetry,providing a simple model with very good features: the curvature is completelysmooth along the fifth dimension, it localizes 4D gravity and the spectrum ofgravity fluctuations presents a mass gap, a fact that rules out the existenceof phenomenologically dangerous ultralight KK excitations in the model. Wefinally present our solution as a limit of scalar thick branes.



Autor: Alfredo Herrera-Aguilar, Dagoberto Malagon-Morejon, Refugio Rigel Mora-Luna

Fuente: https://arxiv.org/



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