The curvaton is a hypothetical elementary particle which mediates a scalar field in early universe cosmology. It can generate fluctuations during inflation, but does not itself drive inflation, instead it generates curvature perturbations at late times after the inflaton field has decayed and the decay products have redshifted away, when the curvaton is the dominant component of the energy density. It is used to generate a flat spectrum of CMB perturbations in models of inflation where the potential is otherwise too steep or in alternatives to inflation like the pre-Big Bang scenario.
- Metric expansion of space
- Hubble's law
- Big bang
- Cosmological constant
- Cosmological perturbation theory
- Structure formation
- Kari Enqvist
- David Wands
- David H. Lyth
- Enqvist & Sloth. "Adiabatic CMB perturbations in pre-big bang string cosmology".
- Lyth & Wands. "Generating the curvature perturbation without an inflaton".
- Moroi & Takahashi. "Effects of Cosmological Moduli Fields on Cosmic Microwave Background".
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