When matter matters
- Department of Physics and School of Earth and Space Exploration and Beyond Center, Arizona State University, Tempe, AZ, 85287-1504 (United States)
- Institut für Theoretische Physik, Ruprecht-Karls-Universität Heidelberg Philosophenweg 16, 69120 Heidelberg (Germany)
- CERN, Theory Division, CH-1211 Genève 23 (Switzerland)
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.
- OSTI ID:
- 22282792
- Journal Information:
- Journal of Cosmology and Astroparticle Physics, Vol. 2013, Issue 07; Other Information: Country of input: International Atomic Energy Agency (IAEA); ISSN 1475-7516
- Country of Publication:
- United States
- Language:
- English
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