https://doi.org/10.1140/epjc/s10052-026-15535-0
Regular Article - Theoretical Physics
New perspectives from matter creation cosmologies to dark sector interactions
1
Núcleo de Matemática, Física y Estadística, Universidad Mayor, Av. Alemania 281, Temuco, Chile
2
Departamento de Física, Universidad del Bío-Bío, Casilla 5-C, Concepción, Chile
3
Centro de Ciencias Exactas, Universidad del Bío-Bío, Casilla 447, Chillán, Chile
4
Instituto de Física y Astronomía, Universidad de Valparaíso, Av. Gran Bretaña 1111, Valparaíso, Chile
5
Instituto de Ciencias Físicas y Matemáticas, Universidad Austral de Chile, Casilla 567, 5090000, Valdivia, Chile
a
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Received:
3
September
2025
Accepted:
8
March
2026
Published online:
29
April
2026
Abstract
We investigate a cosmological model based on matter creation in a single-component universe, its late time behavior and observational constraints derived from observational data. Furthermore, we explore the equivalence between this framework and interacting dark sector models, which establishes a connection between the matter creation rate and cosmological interactions. We first focus on the case of a constant equation of state parameter, where both known and novel interaction terms naturally emerge from matter creation, numerous of them exhibiting a sign-changeable behavior. The analysis is then extended to a time-dependent equation of state by using dynamical systems techniques.
© The Author(s) 2026
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