Towards an explicit model of D-brane inflation

By D. Baumann, Anatoly Dymarsky, I. Klebanov, Liam McAllister. 2007

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We present a detailed analysis of an explicit model of warped D-brane inflation, incorporating the effects of moduli stabilization. We consider the potential for D3-brane motion in a warped conifold background that includes fluxes and holomorphically embedded D7-branes involved in moduli stabilization. Although the D7-branes significantly modify the inflaton potential, they do not correct the quadratic term in the potential, and hence do not cause a uniform change in the slow roll parameter eta. Nevertheless, we present a simple example based on the Kuperstein embedding of D7-branes, z1 = constant, in which the potential can be fine-tuned to be sufficiently flat for inflation. To derive this result, it is essential to incorporate the fact that the compactification volume changes slightly as the D3-brane moves. We stress that the compactification geometry dictates certain relationships among the parameters in the inflaton Lagrangian, and these microscopic constraints impose severe restrictions on the space of possible models. We note that the shape of the final inflaton potential differs from projections given in earlier studies: in configurations where inflation occurs, it does so near an inflection point. Finally, we comment on the difficulty of making precise cosmological predictions in this scenario. This is the companion paper to Baumann et al (2007 Phys. Rev. Lett. 99 141601).

Subfields: Astronomy and Astrophysics, Nuclear and High Energy Physics

View Paper: https://www.semanticscholar.org/paper/3ef963f6d516acf93efd0eef2344ffb66fb02bfc

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Citations in the corpus

Primordial Black Holes from Polynomial Potentials in Single Field Inflation (2017, unknown): “The spectral index on large scales corresponding to the CMB ( N e = N CMB = 50 − 60) can be computed using the standard slow-roll methods giving [71, 72] where and we assume N max , 0 1.”
D3-brane potentials from fluxes in AdS/CFT (2010, background): “Such a contribution is generically present, but could not be found in [16], which incorporated only perturbations of the superpotential.”
Les Houches Lectures on Constructing String Vacua (2008, background): “More general F-theory model building is also possible and provides probably the most extensive class of particle physics models in string theory, allowing in particular unificationto arise naturally [21,22].”
Oscillations in the CMB from axion monodromy inflation (2009, background): “Let us first recall that in scenarios of D3-brane inflation in nonperturbatively-stabilized vacua, even a single D3-brane moving slowly in a throat can affect the warp factor, and correspondingly the warped volumes of four-cycles bearing nonperturbative effects, to such a degree that this interactio”
Inflation and String Theory (2014, background): “single explicit embedding is known in which inflation can occur [218, 637].”
Monodromy in the CMB: Gravity Waves and String Inflation (2008, background): “Even given this, the problem of controlling inflation in each sub-Planckian range of field space is itself extremely subtle, as explained in the series of works [20, 21, 22, 23].”
Brane-World Gravity (2004, background): “Recently there has been a new development and it has become possible to calculate all significant contributions to the D3 brane potential in the single coherent framework of 10-dimensional supergravity [31, 30, 28, 29].”