Abstract
Classical evolution of density perturbations, while the scale remains in the large scale limit, is clarified in the following generalized gravity theories: f(R) gravity, generalized scalar tensor theory, gravity with non-minimally coupled scalar field and induced gravity. The author uses gauge-invariant potential and field variables and shows that the result can be expressed in a similar form to a conventional result derived in Einstein gravity with a minimally coupled scalar field. The author rederives the solutions in the large scale in a simple way using the conformal transformation properties of these theories. The author gives a general prescription for calculating the inflationary spectrum in these gravity theories which can be applicable to specific models.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
