Bouncing Galileon Cosmologies

Details Bouncing Galileon Cosmologies Bouncing Galileon Cosmologies

2011-08-02

arxiv.org/abs/1108.0593v2

JCAP 1110:036,2011

Physics

High Energy Physics

High Energy Physics - Theory

17 pages, 7 figures, accepted by JCAP

Scientific paper

We present nonsingular, homogeneous and isotropic bouncing solutions of the conformal Galileon model. We show that such solutions necessarily begin with a radiation-dominated contracting phase. This is followed by a quintom scenario in which the background equation of state crosses the cosmological constant boundary allowing for a nonsingular bounce which in turn is followed by Galilean Genesis. We analyze the spectrum of cosmological perturbations in this background. Our results show that the fluctuations evolve smoothly and without any pathology, but the adiabatic modes form a blue tilted spectrum. In order to achieve a scale-invariant primordial power spectrum as required by current observations, we introduce a light scalar field coupling to the Galileon kinetically. We find two couplings which yield a scale-invariant spectrum, one of which requires a fine tuning of the initial conditions. This model also predicts a blue tilted spectrum of gravitational waves stemming from quantum vacuum fluctuations in the contracting phase.

Affiliated with

Also associated with

No associations

Rating

Bouncing Galileon Cosmologies does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Bouncing Galileon Cosmologies, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Bouncing Galileon Cosmologies will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-510276