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.

4 pages, 2 figures; To appear in PRD

References in corpus (1)

• Doppelganger defects

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