Supersymmetric DBI inflation

Abstract

We discuss a supersymmetric version of DBI (Dirac-Born-Infeld) inflation, which is a typical inflation model in string cosmology. The supersymmetric DBI action together with a superpotential always leads to correction terms associated with the potential into the kinetic term, which drastically change the dynamics of DBI inflation. We find two significant features of supersymmetric DBI inflation. The first one is that ultra-relativistic motion is prohibited to cause inflation, which leads to order of unity sound velocity squared and hence small non-Gaussianities of primordial curvature perturbations. The second one is that the relation between the tensor-to-scalar ratio and the field variation is modified. Then, significant tensor-to-scalar ratio $r\gtrsim 0.01$ is possible even for sub-Planck variation of the field. These new features are in sharp contrast with those of the standard non-supersymmetric DBI inflation and hence have a lot of interest implications on upcoming observations of cosmic microwave background (CMB) anisotropies by the Planck satellite as well as direct detection experiments of gravitational waves like DECIGO and BBO.

5 pages, final version accepted for publication in PLB

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• The goldstone and goldstino of supersymmetric inflation
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• The Imaginary Starobinsky Model and Higher Curvature Corrections
• Classifying BPS States in Supersymmetric Gauge Theories Coupled to Higher Derivative Chiral Models
• Higher Derivative Corrections to Manifestly Supersymmetric Nonlinear Realizations
• Topological solitons in the supersymmetric Skyrme model
• Ghostbusters in higher derivative supersymmetric theories: who is afraid of propagating auxiliary fields?
• DBI Inflation in N=1 Supergravity
• Higher derivative three-form gauge theories and their supersymmetric extension
• Supersymmetry Breaking in Spatially Modulated Vacua
• Topological couplings in higher derivative extensions of supersymmetric three-form gauge theories
• Ghost-free vector superfield actions in supersymmetric higher-derivative theories
• Stable small spatial hairs in a power-law k-inflation model
• CMB imprints of non-canonical anisotropic inflation
• Supersymmetry breaking and ghost Goldstino in modulated vacua
• Ghostbusters in $f(R)$ supergravity
• KK-number non-conserving decays: Signal of n = 2 excitations of Extra-Dimensional Models at the LHC
• More on DBI action in 4D $\mathcal{N}=1$ supergravity
• High Energy Physics and Cosmology at the Unification Frontier: Opportunities and Challenges in the coming years
• Higher Derivative Supersymmetric Nonlinear Sigma Models on Hermitian Symmetric Spaces, and BPS States Therein
• Supersymmetric Dirac-Born-Infeld Axionic Inflation and Non-Gaussianity
• Enhancement of the Axion Decay Constant in Inflation and the Weak Gravity Conjecture
• Horndeski model in nonlinearly realized supergravity
• On the validity of cosmic no-hair conjecture in an anisotropic inflationary model
• Vacua by Derivative Corrections in $\mathcal{N}=1$ Supergravity with Matter Multiplets