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Gansukh Tumurtushaa
순수물리이론 연구단
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Reconstruction of the Scalar Field Potential in Inflationary Models with a Gauss-Bonnet term

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Title
Reconstruction of the Scalar Field Potential in Inflationary Models with a Gauss-Bonnet term
Author(s)
Seoktae Koh; Bum-Hoon Lee; Gansukh Tumurtushaa
Publication Date
2017-06
Journal
PHYSICAL REVIEW D, v.95, no.12, pp.123509 -
Publisher
American Physical Society
Abstract
We consider inflationary models with a Gauss-Bonnet term to reconstruct the scalar-field potentials and the Gauss-Bonnet coupling functions. Both expressions are derived from the observationally favored configurations of ns and r. Our result implies that, for the reconstructed potentials and coupling functions, the blue tilt of inflationary tensor fluctuations can be realized. To achieve a blue tilt for the inflationary tensor fluctuations, a scalar field must climb up its potential before rolling down. We further investigate the properties of propagation of the perturbation modes in Friedmann-Robertson-Walker spacetime. For the reconstructed configurations that give rise to the blue tilt for the inflationary tensor fluctuations, we show that the ghosts and instabilities are absent with the superluminal propagation speeds for the scalar perturbation modes, whereas the propagation speeds of the tensor perturbations are subluminal. © 2017 American Physical Society
URI
http://pr.ibs.re.kr/handle/8788114/4090
DOI
10.1103/PhysRevD.95.123509
ISSN
2470-0010
Appears in Collections:
Center for Fundamental Theory(순수물리이론 연구단) > Journal Papers (저널논문)
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