Astronomy and Astrophysics – Astrophysics
Scientific paper
1999-11-08
Phys.Rev. D61 (2000) 103504
Astronomy and Astrophysics
Astrophysics
Scientific paper
10.1103/PhysRevD.61.103504
The spectrum of adiabatic density perturbation generated during inflation is studied in the case the time derivative of an inflation-driving scalar field (inflaton) vanishes at some time during inflation. It is shown that the nondecaying mode of perturbation has a finite value even in this case and that its amplitude is given by the standard formula with the time derivation of the scalar field replaced by the potential gradient using the slow-roll equation.
Kodama Hideo
Seto Osamu
Yokoyama Jun'ichi
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