Warm Higgs G-inflation: predictions and constraints from Planck 2015 likelihood

Abstract

We reconsider a recently proposed warm G-inflation scenario in which the Galileon scalar field concurrently dissipates its kinetic energy as the radiation fluid throughout inflation and the universe smoothly enters into a radiation dominated era without going through the reheating phase. It is shown that the perturbed second-order Langevin equation can be nicely simplified and solved by defining the Galileon dissipation factor, $Q_G=\frac{Q}{\mathcal{B}}$, resulting in a power spectrum utilizing a Green function approach for the dissipative coefficient independent of temperature. However, for a dissipation coefficient depending on temperature, the perturbed inflaton and radiation field equations will be coupled in the high temperature regime. Therefore, the produced radiation backreacts on the power spectrum, modifying it with a growing mode function in the high dissipation regime. Finally, a model is proposed in which the standard Higgs boson dissipates into light mediator fields, for instance, fermions with a linear temperature dependent dissipative coefficient which can act as inflaton, thanks to the Galileon-like non-linear derivative interaction. The generated primordial perturbations in the G-dominant regime is in excellent agreement with Planck 2015 likelihood+ TTTEEE+BAO at large scales despite its large self-coupling $\lambda \sim 0.13$ through accommodating many light mediator fields. However, although such primordial perturbations may also get amplified by several orders of magnitude at small scales due to the presence of the growing mode function, warm G-inflation shows a striking feature in that the growing mode can be controlled or completely disappeared by decreasing the value of the propagating sound speed $c_s$.

arXiv comment23 pages, 6 figures

References in corpus (61)

• Observational Evidence from Supernovae for an Accelerating Universe and a Cosmological Constant
• Planck 2015 results. XIII. Cosmological parameters
• Seven-Year Wilkinson Microwave Anisotropy Probe (WMAP) Observations: Cosmological Interpretation
• Towards the Theory of Reheating After Inflation
• k-Inflation
• Reheating after Inflation
• Perturbations in k-inflation
• Covariant Galileon
• DBI in the Sky
• Warm Inflation
• Phenomenology with Massive Neutrinos
• Generalized Galileons: All scalar models whose curved background extensions maintain second-order field equations and stress tensors
• Ghost Inflation
• G-inflation: inflation driven by the Galileon field
• Inflation scenario via the Standard Model Higgs boson and LHC
• New Model of Inflation with Non-minimal Derivative Coupling of Standard Model Higgs Boson to Gravity
• Thermally Induced Density Perturbations in the Inflation Era
• Warm Inflation and its Microphysical Basis
• Galileon Cosmology
• Scalar perturbation spectra from warm inflation
• Self-Accelerating Universe in Galileon Cosmology
• Warm Little Inflaton
• Thermal Properties of an Inflationary Universe
• Perturbation Spectra in the Warm Inflationary Scenario
• Warm inflation model building
• The importance of being warm (during inflation)
• Dissipation coefficients from scalar and fermion quantum field interactions
• Is Warm Inflation Possible?
• Higgs G-inflation
• General dissipation coefficient in low-temperature warm inflation
• A First Principles Warm Inflation Model that Solves the Cosmological Horizon/Flatness Problems
• Power spectrum for inflation models with quantum and thermal noises
• Density fluctuations from warm inflation
• Shear viscous effects on the primordial power spectrum from warm inflation
• Warm inflation dissipative effects: predictions and constraints from the Planck data
• Non-gaussianity in fluctuations from warm inflation
• Construction of a robust warm inflation mechanism
• On the consistency of warm inflation
• Cosmological Perturbations in the New Higgs Inflation
• Cosmological fluctuations of a random field and radiation fluid
• On Perturbations in Warm Inflation
• Spontaneous baryogenesis in warm inflation
• Introducing the Slotheon: a slow Galileon scalar field in curved space-time
• Constraining Warm Inflation with CMB data
• Potential-driven Galileon inflation
• Warm DBI Inflation
• Warm baryogenesis
• Dynamics of Interacting Scalar Fields in Expanding Space-Time
• Warm natural inflation
• Observational Constraints on Monomial Warm Inflation
• Density perturbations in warm inflation and COBE normalization
• Revisiting CMB constraints on Warm Inflation
• Inflationary Initial Conditions Consistent with Causality
• Extension of warm inflation to noncanonical scalar fields
• Cosmological perturbations for an inflaton field coupled to radiation
• Graceful exit from Higgs G-inflation
• Non-gaussianity in the strong regime of warm inflation
• Warming up for Planck
• Exploring the Parameter Space of Warm-Inflation Models
• Power spectra in warm G-inflation and its consistency: stochastic approach
• G-Warm inflation

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• Primordial Black Holes Dark Matter and Secondary Gravitational Waves from Warm Higgs-G Inflation
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