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Inflation model building with an accurate measure of e-folding

Chongchitnan, Sirichai


Sirichai Chongchitnan


It has become standard practice to take the logarithmic growth of the scale factor as a measure of the amount of inflation, despite the well-known fact that this is only an approximation for the true amount of inflation required to solve the horizon and flatness problems. The aim of this work is to show how this approximation can be completely avoided using an alternative framework for inflation model building. We show that using the inverse Hubble radius, H=aH , as the key dynamical parameter, the correct number of e-folding arises naturally as a measure of inflation. As an application, we present an interesting model in which the entire inflationary dynamics can be solved analytically and exactly, and, in special cases, reduces to the familiar class of power-law models.


Chongchitnan, S. (2016). Inflation model building with an accurate measure of e-folding. Physical Review D, 94(4), doi:10.1103/PhysRevD.94.043526

Journal Article Type Article
Acceptance Date Jun 18, 2016
Online Publication Date Aug 23, 2016
Publication Date Aug 23, 2016
Deposit Date Sep 20, 2016
Publicly Available Date Sep 20, 2016
Journal Physical review D
Print ISSN 2470-0010
Electronic ISSN 2470-0029
Publisher American Physical Society
Peer Reviewed Peer Reviewed
Volume 94
Issue 4
Article Number 043526
Keywords Inflation model building , e-folding, Horizon problem
Public URL
Publisher URL
Additional Information Authors' accepted manuscript of article published in: Physical review D, 2016, v.94, issue 4.


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