NO Curvatons or Hybrid Quintessential Inflation

Abstract

We consider a curvaton scenario in which the late-time domination and the generation of the curvature perturbation is achieved by a non-oscillatory (NO) curvaton potential. Instead of considering the conventional curvaton oscillation, we consider ``weak trapping'' after preheating, which modifies the evolution of the curvaton density after preheating. The primordial isocurvature perturbation related to the curvaton is once converted into the fluctuation of the number density of the preheat field through inhomogeneous preheating. Then the evolution of the curvatons and the preheat field is controlled by the preheat-field number density. The density of these fields decreases slightly slower than the standard matter density which suggests that these fields will grow with time. Finally, the preheat field decays to reheat the Universe leaving behind the curvature perturbation. In our scenario the task of the standard curvaton is not executed solely by the curvaton itself but is partially shared with the preheat field. NO curvatons can be considered as the hybrid version of the quintessential inflationary model.

12 pages, no figure, added references

References in corpus (25)

• Towards the Theory of Reheating After Inflation
• Generating the curvature perturbation without an inflaton
• Effects of Cosmological Moduli Fields on Cosmic Microwave Background
• Nongaussian Isocurvature Perturbations from Inflation
• Quintessential inflation
• A new mechanism for generating density perturbations from inflation
• Beauty is Attractive: Moduli Trapping at Enhanced Symmetry Points
• Generating the curvature perturbation at the end of inflation
• Inflation and Preheating in NO models
• Moduli Stabilization with the String Higgs Effect
• Modulated fluctuations from hybrid inflation
• Can the curvaton paradigm accommodate a low inflation scale?
• Challenges in generating density perturbations from a fluctuating inflaton coupling
• Curvature Perturbations from Broken Symmetries
• Low scale inflation and the curvaton mechanism
• Topological Curvatons
• Trapped Quintessential Inflation
• Curvaton paradigm can accommodate multiple low inflation scales
• Generating the curvature perturbation with instant preheating
• Scenarios of modulated perturbations
• Modular inflation and the orthogonal axion as curvaton
• Cosmological density perturbations from perturbed couplings
• Inflation at the TeV scale with a PNGB curvaton
• Brane inflation without slow-roll
• Tracking Curvaton(s)?

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• Spotted Inflation
• Running spectral index from shooting-star moduli
• Modulated decay in the multi-component Universe
• Non-standard kinetic term as a natural source of non-Gaussianity
• Cosmological Imprints of SUSY Breaking in Models of Sgoldstinoless Non-Oscillatory Inflation
• Constraining the quintessential $\alpha$-attractor inflation through dynamical horizon exit method
• Entropy production and curvature perturbation from dissipative curvatons
• Aspects of warm-flat directions
• Spontaneous baryogenesis and generation of gravitational waves in a new model of quintessential $\alpha$-attractor
• Kination cosmology from scalar fields and gravitational-wave signatures