Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
1999-02-08
Phys.Rev. D60 (1999) 103513
Physics
High Energy Physics
High Energy Physics - Phenomenology
7 pages, 4 figures
Scientific paper
10.1103/PhysRevD.60.103513
We study the preheating scenario in Generalized Einstein Theories, considering a class of such theories which are conformally equivalent to those of an extra field with a modified potential in the Einstein frame. Resonant creation of bosons from oscillating inflaton has been studied before in the context of general relativity taking also into account the effect of metric perturbations in linearized gravity. As a natural generalization we include the dilatonic/Brans-Dicke field without any potential of its own and in particular we study the linear theory of perturbations including the metric perturbations in the longitudinal gauge. We show that there is an amplification of the perturbations in the dilaton/Brans-Dicke field on super-horizon scales (k -> 0) due to the fluctuations in metric, thus leading to an oscillating Newton's constant with very high frequency within the horizon and with growing amplitude outside the horizon. We briefly mention the entropy perturbations generated by such fluctuations and also mention that there is a possibility to excite the Kaluza-Klein modes in the theories where the dilatonic/Brans-Dicke field is interpreted as a homogeneous field appearing due to the dimensional reduction from the higher dimensional theories.
Mazumdar Anupam
Mendes Luis E.
No associations
LandOfFree
Preheating in Generalized Einstein Theories 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 Preheating in Generalized Einstein Theories, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Preheating in Generalized Einstein Theories will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-490589