TL;DR
This paper investigates the potential for inflation driven by a D3-brane at the tip of a warped deformed conifold, exploring slow roll and DBI regimes, and proposing a mass cancellation mechanism.
Contribution
It introduces a new inflationary scenario without anti D3-branes, utilizing threshold corrections to the superpotential and analyzing conditions for viable inflation.
Findings
Hilltop inflation compatible with CMB data is possible with fine tuning.
A necessary condition for viable DBI inflation is formulated.
A mechanism to cancel large inflaton mass in D3-anti D3 inflation is proposed.
Abstract
We study the motion of a (space filling) D3-brane at the tip of a warped deformed conifold, looking for inflationary trajectories. In our setup no anti D3-brane is present and the inflaton potential is induced by threshold corrections to the superpotential. First we study the slow roll regime and find that, allowing for fine tuning, hilltop inflation compatible with CMB data can take place. Then we consider the DBI regime and formulate a necessary condition for a phenomenologically viable inflationary stage. En passant, we propose a mechanism to cancel the large inflaton mass in the standard radial D3-anti D3-brane inflation.
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