TY - JOUR
T1 - An equation of state for purely kinetic k-essence inspired by cosmic topological defects
AU - Cordero, Rubén
AU - González, Eduardo L.
AU - Queijeiro, Alfonso
N1 - Publisher Copyright:
© 2017, The Author(s).
PY - 2017/6/1
Y1 - 2017/6/1
N2 - We investigate the physical properties of a purely kinetic k-essence model with an equation of state motivated in superconducting membranes. We compute the equation of state parameter w and discuss its physical evolution via a nonlinear equation of state. Using the adiabatic speed of sound and energy density, we restrict the range of parameters of the model in order to have an acceptable physical behavior. We study the evolution of the scale factor and address the question of the possible existence of finite-time future singularities. Furthermore, we analyze the evolution of the luminosity distance d L with redshift z by comparing (normalizing) it with the Λ CDM model. Since the equation of state parameter is z-dependent the evolution of the luminosity distance is also analyzed using the Alcock–Paczyński test.
AB - We investigate the physical properties of a purely kinetic k-essence model with an equation of state motivated in superconducting membranes. We compute the equation of state parameter w and discuss its physical evolution via a nonlinear equation of state. Using the adiabatic speed of sound and energy density, we restrict the range of parameters of the model in order to have an acceptable physical behavior. We study the evolution of the scale factor and address the question of the possible existence of finite-time future singularities. Furthermore, we analyze the evolution of the luminosity distance d L with redshift z by comparing (normalizing) it with the Λ CDM model. Since the equation of state parameter is z-dependent the evolution of the luminosity distance is also analyzed using the Alcock–Paczyński test.
UR - http://www.scopus.com/inward/record.url?scp=85021242068&partnerID=8YFLogxK
U2 - 10.1140/epjc/s10052-017-4913-7
DO - 10.1140/epjc/s10052-017-4913-7
M3 - Artículo
SN - 1434-6044
VL - 77
JO - European Physical Journal C
JF - European Physical Journal C
IS - 6
M1 - 413
ER -