Non-geometrical perturbation on homogeneous stealth dust
DOI:
https://doi.org/10.31349/RevMexFis.72.020702Keywords:
Scalar fields; cosmology; numerical relativityAbstract
In this work, we study a non-geometrical perturbation to the stealth field, which means the background remains invariant. The stealh is homogeneous in a universe whose source is dust and demand that perturbation unchanged density. As a regular procedure, we introduce a parameter λ to perturb the scalar field equation and get an intriguing expression of the equation, similar to a series expansion in λ. From this procedure, we distinguish and approach to discriminate solutions, and the numerical solutions show that the most significant contribution to the solution comes from the linear term of λ.
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Copyright (c) 2026 J. Blanco, C. Campuzano, J. C. Corona-Oran, V. H. Cárdenas
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