Dilaton contributions to the cosmic gravitational wave background
Abstract
We consider the cosmological amplification of a metric perturbation propagating in a higher-dimensional Brans-Dicke background, including a nontrivial dilaton evolution. We discuss the properties of the spectral energy density of the produced gravitons (as well as of the associated squeezing parameter), and we show that the present observational bounds on the graviton spectrum provide significant information on the dynamical evolution of the early Universe.
- Publication:
-
Physical Review D
- Pub Date:
- February 1993
- DOI:
- 10.1103/PhysRevD.47.1519
- arXiv:
- arXiv:gr-qc/9211021
- Bibcode:
- 1993PhRvD..47.1519G
- Keywords:
-
- 04.30.+x;
- 04.60.+n;
- 98.80.Cq;
- Particle-theory and field-theory models of the early Universe;
- General Relativity and Quantum Cosmology;
- High Energy Physics - Theory
- E-Print:
- 26 pages, plain tex (to appear in Phys.Rev.D, 1 fig available from the authors upon req.)