Primordial gravitational waves in inflationary braneworld

Details Primordial gravitational waves in inflationary braneworld Primordial gravitational waves in inflationary braneworld

2003-05-02

arxiv.org/abs/gr-qc/0305006v3

Phys.Rev. D68 (2003) 044025

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

16 pages, 4 figures, typos corrected

Scientific paper

10.1103/PhysRevD.68.044025

We study primordial gravitational waves from inflation in Randall-Sundrum braneworld model. The effect of small change of the Hubble parameter during inflation is investigated using a toy model given by connecting two de Sitter branes. We analyze the power spectrum of final zero-mode gravitons, which is generated from the vacuum fluctuations of both initial Kaluza-Klein modes and zero-mode. The amplitude of fluctuations is confirmed to agree with the four-dimensional one at low energies, whereas it is enhanced due to the normalization factor of zero-mode at high energies. We show that the five-dimensional spectrum can be well approximated by applying a simple mapping to the four-dimensional fluctuation amplitude.

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