Simple inflationary models in Gauss–Bonnet brane-world cosmology. (24th May 2016)

• Record Type: Journal Article
• Authors: Okada, Nobuchika; Okada, Satomi
• Is Part Of: Classical and quantum gravity. Volume 33:Number 12(2016:Jun.)
• Publication Date: 2016-05-24
• Subjects: cosmological inflation -- brane-world -- Gauss–Bonnet; Quantum gravity -- Periodicals; Gravitation -- Periodicals; Relativity (Physics) -- Periodicals; Space and time -- Periodicals; Periodicals; 521.1
• DOI: 10.1088/0264-9381/33/12/125034
• Languages: English
• ISSNs: 0264-9381

Abstract

Abstract: In light of the recent Planck 2015 results for the measurement of the cosmic microwave background (CMB) anisotropy, we study simple inflationary models in the context of the Gauss–Bonnet (GB) brane-world cosmology. The brane-world cosmological effect modifies the power spectra of scalar and tensor perturbations generated by inflation and causes a dramatic change for the inflationary predictions of the spectral index ( n s ) and the tensor-to-scalar ratio ( r ) from those obtained in the standard cosmology. In particular, the predicted r values in the inflationary models favored by the Planck 2015 results are suppressed due to the GB brane-world cosmological effect, which is in sharp contrast with inflationary scenario in the Randall–Sundrum brane-world cosmology, where the r values are enhanced. Hence, these two brane-world cosmological scenarios are distinguishable. With the dramatic change of the inflationary predictions, the inflationary scenario in the GB brane-world cosmology can be tested by more precise measurements of n s and future observations of the CMB B -mode polarization.