Radial oscillations and tidal Love numbers of dark energy stars

Grigorios Panotopoulos; Ángel Rincón; Ilídio Lopes

doi:10.1140/epjp/s13360-020-00867-x

EPJ

Radial oscillations and tidal Love numbers of dark energy stars

Grigorios Panotopoulos¹^a, Ángel Rincón² and Ilídio Lopes¹

¹ Centro de Astrofísica e Gravitação, Departamento de Física, Instituto Superior Técnico-IST, Universidade de Lisboa-UL, Av. Rovisco Pais, 1049-001, Lisbon, Portugal
² Instituto de Física, Pontificia Universidad Católica de Valparaíso, Avenida Brasil 2950, Casilla 4059, Valparaíso, Chile

Received: 20 August 2020
Accepted: 16 October 2020
Published online: 22 October 2020

Abstract

We investigate the properties of relativistic stars made of dark energy. We model stellar structure assuming (1) isotropic perfect fluid and (2) a dark energy inspired equation of state, the generalized equation of state of Chaplygin gas, as we will be calling it. The mass-to-radius profiles, the tidal Love numbers as well as the ten lowest radial oscillation modes are computed. Causality, stability and energy conditions are also discussed.