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Relativistic stars in a cubic Galileon Universe

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We study relativistic stars in Hordenski theories that evade the gravitational wave constraints and exhibit the Vainshtein mechanism, focusing on a model based on the cubic Galileon Lagrangian. We derive the scalar field profile for static spherically symmetric objects in asymptotically de Sitter space-time with a linear time dependence. The exterior solution matches to the black hole solution found in the literature. Due to the Vainshtein mechanism, the stellar structure is indistinguishable from that of General Relativity with the same central density as long as the radius of the star is shorter than the Vainshtein radius. On the other hand, the scalar field is not suppressed beyond the Vainshtein radius. These solutions have an additional integration constant in addition to the mass of the star.
Original languageEnglish
Article number024026
Number of pages7
JournalPhysical Review D
Issue number2
Publication statusPublished - 8 Jan 2020


  • PhysRevD.101.024026

    Rights statement: Hiromu Ogawa, Tsutomu Kobayashi and Kazuya Koyama. 'Relativistic stars in a cubic Galileon universe.' Phys. Rev. D. 101, 024026. © 2020 American Physical Society. All rights reserved.

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