Astronomy and Astrophysics – Astrophysics
Scientific paper
1999-02-24
Phys.Rev. D60 (1999) 123510
Astronomy and Astrophysics
Astrophysics
9 pages, including 1 figure, submitted to Phys. Rev. D
Scientific paper
10.1103/PhysRevD.60.123510
Extending previous results [Phys. Rev.D {\bf 56}, 6351 (1997)], we estimate the back reaction of cosmological gravitons in the expansion dynamics, during the matter age. Tensor perturbations with scales larger than the Hubble radius are created due to the inequivalence of vacua at different times. During noninflationary phases these perturbations become effective gravitational waves as they enter the Hubble radius, adding new contributions to the energy density of the subhorizon waves. During the radiation epoch the creation of these effective gravitons may lead to a departure from the standard behaviour $a(t)\propto t^{1/2}$, with possible consequences to several cosmic processes, such as primordial nucleosynthesis. We examine the implications of this phenomenom during the matter dominated era, assuming an initial inflationary period. The dynamical equation obeyed by the scale factor is derived and numerically solved for different values of the relevant parameters involved.
Alcaniz Jailson S.
Carvalho João C.
Garcia Maia R. de M.
No associations
LandOfFree
Cosmological gravitons and the expansion dynamics during the matter age 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 gravitons and the expansion dynamics during the matter age, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Cosmological gravitons and the expansion dynamics during the matter age will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-12346