When matter matters

• Verfasst von: Easson, Damien [VerfasserIn]
• Verfasst von: Sawicki, Ignacy [VerfasserIn]
• Verfasst von: Vikman, Alexander [VerfasserIn]
• Titel: When matter matters
• Verf.angabe: Damien A. Easson, Ignacy Sawicki and Alexander Vikman
• E-Jahr: 2013
• Jahr: July 10, 2013
• Umfang: 23 S.
• Fussnoten: Gesehen am 07.01.2021
• Titel Quelle: Enthalten in: Journal of cosmology and astroparticle physics
• Ort Quelle: London : IOP, 2003
• Jahr Quelle: 2013
• Band/Heft Quelle: (2013), 7, Artikel-ID 014, Seite 1-23
• ISSN Quelle: 1475-7516
• DOI: doi:10.1088/1475-7516/2013/07/014
• Datenträger: Online-Ressource
• Sprache: eng
• K10plus-PPN: 1744189153

Abstract

We study a recently proposed scenario for the early universe:Subluminal Galilean Genesis. We prove that without any other matter present in the spatially flat Friedmann universe, the perturbations of the Galileon scalar field propagate with a speed at most equal to the speed of light. This proof applies to all cosmological solutions — to the whole phase space. However, in a more realistic situation, when one includes any matter which is not directly coupled to the Galileon, there always exists a region of phase space where these perturbations propagate superluminally, indeed with arbitrarily high speed. We illustrate our analytic proof with numerical computations. We discuss the implications of this result for the possible UV completion of the model.