On the presence of twinlike models in cosmology

Abstract

We study cosmological models described by a single real scalar field. We work within the first-order framework, and we show how the first-order equations simplify the investigation, leading to a direct search of twinlike theories. The procedure is used to introduce distinct models that support the same first-order equations, with the very same energy densities and pressure in flat spacetime. The presence of curvature forbids the construction of twinlike models in the cosmological scenario here investigated.

arXiv comment4 pages, 2 figures; To appear in PRD

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• Doppelganger defects
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• Inflationary Twin Models
• Matching the linear spectra of twinlike defects
• Cosmological twinlike models with multi scalar fields
• New twinlike models for scalar fields
• Twinlike models for parametrized dark energy
• Note on generalization of Jackiw-Pi Vortices