Journal
PHYSICAL REVIEW D
Volume 67, Issue 12, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevD.67.123510
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String theory gives rise to various mechanisms to generate primordial inflation, of which brane inflation is one of the most widely considered. In this scenario, inflation takes place while two branes are approaching each other, and the modulus field representing the separation between the branes plays the role of the inflaton field. We study the phase space of initial conditions which can lead to a sufficiently long period of cosmological inflation, and find that taking into account the possibility of nonvanishing initial momentum can significantly change the degree of fine-tuning of the required initial conditions.
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