Abstract
We revisit the old (fourth-order or quadratically generated) gravity model of Starobinsky in four spacetime dimensions, and derive the (inflaton) scalar potential in the equivalent scalartensor gravity model. The inflaton scalar potential is used to compute the (CMB) observables of inflation, associated with curvature perturbations (namely, the scalar and tensor spectral indices, and the tensor-to-scalar ratio), including the new next-to-leading order terms with respect to the inverse number of e-foldings. The results are compared to the recent (WMAP5) experimental bounds. We confirm both mathematical and physical equivalence between f(R) gravity theories and the corresponding scalartensor gravity theories.
| Original language | English |
|---|---|
| Pages (from-to) | 2753-2762 |
| Number of pages | 10 |
| Journal | Modern Physics Letters A |
| Volume | 25 |
| Issue number | 32 |
| DOIs | |
| Publication status | Published - 20 Oct 2010 |
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Keywords
- Cosmology
- inflation
- modified gravity
- spectral index
ASJC Scopus subject areas
- Astronomy and Astrophysics
- Nuclear and High Energy Physics
Cite this
Fourth-order gravity as the inflationary model revisited. / Kaneda, Sho; Ketov, Sergei V.; Watanabe, Natsuki.
In: Modern Physics Letters A, Vol. 25, No. 32, 20.10.2010, p. 2753-2762.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Fourth-order gravity as the inflationary model revisited
AU - Kaneda, Sho
AU - Ketov, Sergei V.
AU - Watanabe, Natsuki
PY - 2010/10/20
Y1 - 2010/10/20
N2 - We revisit the old (fourth-order or quadratically generated) gravity model of Starobinsky in four spacetime dimensions, and derive the (inflaton) scalar potential in the equivalent scalartensor gravity model. The inflaton scalar potential is used to compute the (CMB) observables of inflation, associated with curvature perturbations (namely, the scalar and tensor spectral indices, and the tensor-to-scalar ratio), including the new next-to-leading order terms with respect to the inverse number of e-foldings. The results are compared to the recent (WMAP5) experimental bounds. We confirm both mathematical and physical equivalence between f(R) gravity theories and the corresponding scalartensor gravity theories.
AB - We revisit the old (fourth-order or quadratically generated) gravity model of Starobinsky in four spacetime dimensions, and derive the (inflaton) scalar potential in the equivalent scalartensor gravity model. The inflaton scalar potential is used to compute the (CMB) observables of inflation, associated with curvature perturbations (namely, the scalar and tensor spectral indices, and the tensor-to-scalar ratio), including the new next-to-leading order terms with respect to the inverse number of e-foldings. The results are compared to the recent (WMAP5) experimental bounds. We confirm both mathematical and physical equivalence between f(R) gravity theories and the corresponding scalartensor gravity theories.
KW - Cosmology
KW - inflation
KW - modified gravity
KW - spectral index
UR - http://www.scopus.com/inward/record.url?scp=77958013801&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=77958013801&partnerID=8YFLogxK
U2 - 10.1142/S0217732310033918
DO - 10.1142/S0217732310033918
M3 - Article
VL - 25
SP - 2753
EP - 2762
JO - Modern Physics Letters A
JF - Modern Physics Letters A
SN - 0217-7323
IS - 32
ER -