Astronomy and Astrophysics – Astrophysics – General Relativity and Quantum Cosmology
Scientific paper
2007-09-06
Class.Quant.Grav.24:4801-4816,2007
Astronomy and Astrophysics
Astrophysics
General Relativity and Quantum Cosmology
20 pages
Scientific paper
10.1088/0264-9381/24/18/015
In contrast to scalar and tensor modes, vector modes of linear perturbations around an expanding Friedmann--Robertson--Walker universe decay. This makes them largely irrelevant for late time cosmology, assuming that all modes started out at a similar magnitude at some early stage. By now, however, bouncing models are frequently considered which exhibit a collapsing phase. Before this phase reaches a minimum size and re-expands, vector modes grow. Such modes are thus relevant for the bounce and may even signal the breakdown of perturbation theory if the growth is too strong. Here, a gauge invariant formulation of vector mode perturbations in Hamiltonian cosmology is presented. This lays out a framework for studying possible canonical quantum gravity effects, such as those of loop quantum gravity, at an effective level. As an explicit example, typical quantum corrections, namely those coming from inverse densitized triad components and holonomies, are shown to increase the growth rate of vector perturbations in the contracting phase, but only slightly. Effects at the bounce of the background geometry can, however, be much stronger.
Bojowald Martin
Hossain Golam Mortuza
No associations
LandOfFree
Cosmological vector modes and quantum gravity effects 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 Cosmological vector modes and quantum gravity effects, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Cosmological vector modes and quantum gravity effects will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-657936