TwInflation
arXiv:2101.06275 · doi:10.1007/JHEP07(2021)147
Abstract
The general structure of Hybrid Inflation remains a very well-motivated mechanism for lower-scale cosmic inflation in the face of improving constraints on the tensor-to-scalar ratio. However, as originally modeled, the "waterfall" field in this mechanism gives rise to a hierarchy problem (problem) for the inflaton after demanding standard effective field theory (EFT) control. We modify the hybrid mechanism and incorporate a discrete "twin" symmetry, thereby yielding a viable, natural and EFT-controlled model of non-supersymmetric low-scale inflation, "Twinflation". Analogously to Twin Higgs models, the discrete exchange-symmetry with a "twin" sector reduces quadratic sensitivity in the inflationary potential to ultra-violet physics, at the root of the hierarchy problem. The observed phase of inflation takes place on a hilltop-like potential but without fine-tuning of the initial inflaton position in field-space. We also show that all parameters of the model can take natural values, below any associated EFT-cutoff mass scales and field values, thus ensuring straightforward theoretical control. We discuss the basic phenomenological considerations and constraints, as well as possible future directions.
arXiv comment21 pages, 2 figures
References in corpus (44)
- Axion Cosmology
- Hybrid Inflation
- Electroweak symmetry breaking from dimensional deconstruction
- False Vacuum Inflation with Einstein Gravity
- What would we learn by detecting a gravitational wave signal in the cosmic microwave background anisotropy?
- The Twin Higgs: Natural Electroweak Breaking from Mirror Symmetry
- Large Scale Structure and Supersymmetric Inflation without Fine Tuning
- Quasi-Single Field Inflation and Non-Gaussianities
- Completing Natural Inflation
- D-Term Inflation
- Asymmetric Inflationary Reheating and the Nature of Mirror Universe
- Hybrid Inflation from Supergravity D Terms
- Probing the gravitational wave background from cosmic strings with LISA
- Observational Consequences of a Landscape
- Light inflaton Hunter's Guide
- Inflationary paradigm after Planck 2013
- A review of gravitational waves from cosmic domain walls
- Holography and the Electroweak Phase Transition
- Solving the Cosmological Moduli Problem with Weak Scale Inflation
- Pseudonatural Inflation
- Beginning inflation in an inhomogeneous universe
- Robustness of Inflation to Inhomogeneous Initial Conditions
- Signals of Inflationary Models with Cosmic Strings
- Initial Conditions for Inflation - A Short Review
- Inflation after Planck: Judgment Day
- Cosmological Signals of a Mirror Twin Higgs
- More varieties of hybrid inflation
- The Scalar Chemical Potential in Cosmological Collider Physics
- Inhomogeneous Inflation: Numerical Evolution
- P-term, D-term and F-term inflation
- Little Inflatons and Gauge Inflation
- Hybrid Inflation in the Complex Plane
- On the problem of initial conditions for inflation
- Inflating an Inhomogeneous Universe
- Hybrid Natural Inflation
- Probing the Supersymmetric Inflaton and Dark Matter link via the CMB, LHC and XENON1T experiments
- Studies in Small Field Inflation
- MSSM inflation, dark matter, and the LHC
- The Overshoot Problem in Inflation after Tunneling
- Initial conditions for slow-roll inflation in a random Gaussian landscape
- Low Scale Inflation at High Energy Colliders and Meson Factories
- Harmonic Hybrid Inflation
- On Hybrid Monodromy Inflation (Hic Sunt Dracones)
- Warped Hybrid Inflation