Physics – High Energy Physics – High Energy Physics - Theory
Scientific paper
2001-12-14
Phys.Rev. D66 (2002) 083514
Physics
High Energy Physics
High Energy Physics - Theory
10 pages, 6 figures, RevTeX4. Analytical determination of the spectrum, corrected some typos, conclusions unchanged
Scientific paper
10.1103/PhysRevD.66.083514
In this paper, we calculate the spectrum of scalar field fluctuations in a bouncing, asymptotically flat Universe, and investigate the dependence of the result on changes in the physics on length scales shorter than the Planck length which are introduced via modifications of the dispersion relation. In this model, there are no ambiguities concerning the choice of the initial vacuum state. We study an example in which the final spectrum of fluctuations depends sensitively on the modifications of the dispersion relation without needing to invoke complex frequencies. Changes in the amplitude and in the spectral index are possible, in addition to modulations of the spectrum. This strengthens the conclusions of previous work in which the spectrum of cosmological perturbations in expanding inflationary cosmologies was studied, and it was found that, for dispersion relations for which the evolution is not adiabatic, the spectrum changes from the standard prediction of scale-invariance.
Brandenberger Robert H.
Joras Sergio E.
Martin Jerome
No associations
LandOfFree
Trans-Planckian Physics and the Spectrum of Fluctuations in a Bouncing Universe 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 Trans-Planckian Physics and the Spectrum of Fluctuations in a Bouncing Universe, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Trans-Planckian Physics and the Spectrum of Fluctuations in a Bouncing Universe will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-663516