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Cosmological Perturbations Through a Non-Singular Ghost-Condensate/Galileon Bounce

MPG-Autoren

Battarra,  Lorenzo
Theoretical Cosmology, AEI-Golm, MPI for Gravitational Physics, Max Planck Society;

http://pubman.mpdl.mpg.de/cone/persons/resource/persons26307

Köhn,  Michael
String Cosmology, AEI-Golm, MPI for Gravitational Physics, Max Planck Society;

http://pubman.mpdl.mpg.de/cone/persons/resource/persons16239

Lehners,  Jean-Luc
Theoretical Cosmology, AEI-Golm, MPI for Gravitational Physics, Max Planck Society;

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Volltexte (frei zugänglich)

1404.5067.pdf
(Preprint), 3MB

JCAQP_2014_07_007.pdf
(beliebiger Volltext), 3MB

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Zitation

Battarra, L., Köhn, M., Lehners, J.-L., & Ovrut, B. A. (2014). Cosmological Perturbations Through a Non-Singular Ghost-Condensate/Galileon Bounce. Journal of Cosmology and Astroparticle Physics, 2014(7): 007. doi:10.1088/1475-7516/2014/07/007.


Zitierlink: http://hdl.handle.net/11858/00-001M-0000-0024-7712-2
Zusammenfassung
We study the propagation of super-horizon cosmological perturbations in a non-singular bounce spacetime. The model we consider combines a ghost condensate with a Galileon term in order to induce a ghost-free bounce. Our calculation is performed in harmonic gauge, which ensures that the linearized equations of motion remain well-defined and non-singular throughout. We find that, despite the fact that near the bounce the speed of sound becomes imaginary, super-horizon curvature perturbations remain essentially constant across the bounce. In fact, we show that there is a time close to the bounce where curvature perturbations of all wavelengths are required to be momentarily exactly constant. We relate our calculations to those performed in other gauges, and comment on the relation to previous results in the literature.