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High Energy Physics - Theory

arXiv:1602.00699 (hep-th)
[Submitted on 1 Feb 2016 (v1), last revised 6 Jun 2016 (this version, v2)]

Title:The DBI Action, Higher-derivative Supergravity, and Flattening Inflaton Potentials

Authors:Sjoerd Bielleman, Luis E. Ibanez, Francisco G. Pedro, Irene Valenzuela, Clemens Wieck
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Abstract:In string theory compactifications it is common to find an effective Lagrangian for the scalar fields with a non-canonical kinetic term. We study the effective action of the scalar position moduli of Type II D$p$-branes. In many instances the kinetic terms are in fact modified by a term proportional to the scalar potential itself. This can be linked to the appearance of higher-dimensional supersymmetric operators correcting the Kähler potential. We identify the supersymmetric dimension-eight operators describing the $\alpha'$ corrections captured by the D-brane Dirac-Born-Infeld action. Our analysis then allows an embedding of the D-brane moduli effective action into an $\mathcal N = 1$ supergravity formulation. The effects of the potential-dependent kinetic terms may be very important if one of the scalars is the inflaton, since they lead to a flattening of the scalar potential. We analyze this flattening effect in detail and compute its impact on the CMB observables for single-field inflation with monomial potentials.
Comments: 25 pages, 3 figures. Comments and references added. Published version
Subjects: High Energy Physics - Theory (hep-th); Cosmology and Nongalactic Astrophysics (astro-ph.CO); High Energy Physics - Phenomenology (hep-ph)
Report number: IFT-UAM/CSIC-16-007, MPP-2016-6
Cite as: arXiv:1602.00699 [hep-th]
  (or arXiv:1602.00699v2 [hep-th] for this version)
  https://doi.org/10.48550/arXiv.1602.00699

Submission history

From: Clemens Wieck [view email]
[v1] Mon, 1 Feb 2016 21:00:17 UTC (232 KB)
[v2] Mon, 6 Jun 2016 10:44:18 UTC (232 KB)
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