Physics – High Energy Physics – High Energy Physics - Theory
Scientific paper
2003-01-22
Phys.Rev. D67 (2003) 103503
Physics
High Energy Physics
High Energy Physics - Theory
16 pages, 3 figures, reference added
Scientific paper
10.1103/PhysRevD.67.103503
An inflationary brane model driven by a bulk inflaton with exponential potential is proposed. We find a family of exact solutions that describe power-law inflation on the brane. These solutions enable us to derive exact solutions for metric perturbations analytically. By calculating scalar and tensor perturbations, we obtain a spectrum of primordial fluctuations at the end of the inflation. The amplitudes of scalar and tensor perturbations are enhanced in the same way if the energy scale of the inflation is sufficiently higher than the tension of the brane. Then the relative amplitude of scalar and tensor perturbations is not suppressed even for high-energy inflation. This is a distinguishable feature from the inflation model driven by inflaton on the brane where tensor perturbations are suppressed for high-energy inflation. We also point out that massive Kaluza-Klein modes are not negligible at high-frequencies on 3-space of our brane.
Koyama Kazuya
Takahashi Keitaro
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