Brane SUSY Breaking and Inflation: Implications for Scalar Fields and CMB Distorsion

Abstract

I elaborate on a link between the string--scale breaking of supersymmetry that occurs in a class of superstring models and the onset of inflation. The link rests on spatially flat cosmologies supported by a scalar field driven by an exponential potential. If, as in String Theory, this potential is steep enough, under some assumptions that are spelled out in the text the scalar can only climb up as it emerges from an initial singularity. In the presence of another mild exponential, slow--roll inflation is thus injected during the ensuing descent and definite imprints are left in the CMB power spectrum: the quadrupole is systematically reduced and, depending on the choice of two parameters, an oscillatory behavior can also emerge for low multipoles l < 50, in qualitative agreement with WMAP9 and PLANCK data. The experimentally favored value of the spectral index, n_s ~ 0.96, points to a potentially important role for the NS fivebrane, which is unstable in this class of models, in the Early Universe.

9 pages, 4 figures. The original version was based on the talk presented at Rencontres de Moriond EW2013, La Thuile, March 2 - 9 2013. The new version is also based on the talks presented at the "Two-day PLANCK Meeting" and at the "18th Claude Itzykson Meeting". It includes some improved plots and a discussion of the possible role of more general branes

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Cited by in corpus (14)

• Integrable Scalar Cosmologies I. Foundations and links with String Theory
• Inflation after False Vacuum Decay: Observational Prospects after Planck
• Low Variance at large scales of WMAP 9 year data
• Low-l CMB Power Loss in String Inflation
• On the Topology of the Inflaton Field in Minimal Supergravity Models
• Vacuum structure in a chiral R+R^n modification of pure supergravity
• Brane SUSY Breaking and the Gravitino Mass
• Kasner solutions, climbing scalars and big-bang singularity
• Axial Symmetric Kahler manifolds, the D-map of Inflaton Potentials and the Picard-Fuchs Equation
• Pre-Inflationary Relics in the CMB?
• Some Pathways in non-Linear Supersymmetry: Special Geometry Born-Infeld's, Cosmology and dualities
• String Theory clues for the low-$\ell$ CMB ?
• On CMB B-modes and the Onset of Inflation
• Top-down Beyond the Standard Model Review