Eur. Phys. J. C (2018) 78: 591
https://doi.org/10.1140/epjc/s10052-018-6066-8

Regular Article - Theoretical Physics

Reconstruction of a kinetic k-essence Lagrangian from a modified of dark energy equation of state

¹ Instituto de Física y Astronomía, Universidad de Valparaíso, Avenida Gran Bretaña 1111, Casilla 5030, Valparaiso, Chile
² Departamento de Física, Universidad de Santiago de Chile, Avenida Ecuador 3493, Casilla 307, Santiago, Chile
³ Departamento de Matemática y Ciencia de la Computación, Universidad de Santiago de Chile, Las Sophoras 173, Santiago, Chile

^* e-mail: jose.villanueva@uv.cl

Received: 10 April 2018
Accepted: 13 July 2018
Published online: 21 July 2018

Abstract

In this paper the Lagrangian density of a purely kinetic k-essence model that describes the behavior of dark energy described by four parameterized equations of state proposed by Cooray and Huterer (Astrophys J 513:L95, 1999), Zhang and Wu (Mod Phys Lett A 27:1250030, 2012), Linder (Phys Rev Lett 90:091301, 2003), Efstathiou (Mon Not R Astron Soc 310:842, 2000), and Feng and Lu (J Cosmol Astropart Phys 1111:34, 2011) has been reconstructed. This reconstruction is performed using the method outlined by de Putter and Linder (Astropart Phys 28:263, 2007), which makes it possible to solve the equations that relate the Lagrangian density of the k-essence with the given equation of state (EoS) numerically. Finally, we discuss the observational constraints for the models based on 1049 SNIa data points from the Pantheon data set compiled by Scolnic et al. (Astrophys J 859(2):101, 2018)