Warming up for Planck

Abstract

The recent Planck results and future releases on the horizon present a key opportunity to address a fundamental question in inflationary cosmology of whether primordial density perturbations have a quantum or thermal origin, i.e. whether particle production may have significant effects during inflation. Warm inflation provides a natural arena to address this issue, with interactions between the scalar inflaton and other degrees of freedom leading to dissipative entropy production and associated thermal fluctuations. In this context, we present relations between CMB observables that can be directly tested against observational data. In particular, we show that the presence of a thermal bath warmer than the Hubble scale during inflation decreases the tensor-to-scalar ratio with respect to the conventional prediction in supercooled inflation, yielding $r<8|n_t|$, where $n_t$ is the tensor spectral index. Focusing on supersymmetric models at low temperatures, we determine consistency relations between the observables characterizing the spectrum of adiabatic scalar and tensor modes, both for generic potentials and particular canonical examples, and which we compare with the WMAP and Planck results. Finally, we include the possibility of producing the observed baryon asymmetry during inflation through dissipative effects, thereby generating baryon isocurvature modes that can be easily accommodated by the Planck data.

14 pages, 10 figures. Published in JCAP

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• Power spectrum for inflation models with quantum and thermal noises
• Multiple field inflation
• Isocurvature bounds on axions revisited
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Cited by in corpus (21)

• Viscous Cosmology for Early- and Late-Time Universe
• The importance of being warm (during inflation)
• Warm inflation dissipative effects: predictions and constraints from the Planck data
• A note on Single-field Inflation and the Swampland Criteria
• Cosmological fluctuations of a random field and radiation fluid
• Constraining Warm Inflation with CMB data
• Observational implications of mattergenesis during inflation
• Warm Little Inflaton becomes Cold Dark Matter
• Warm inflation within a supersymmetric distributed mass model
• Cosmological perturbations for an inflaton field coupled to radiation
• WarmSPy: a numerical study of cosmological perturbations in warm inflation
• Fluctuation-dissipation dynamics of cosmological scalar fields
• Adiabatic out-of-equilibrium solutions to the Boltzmann equation in warm inflation
• Power spectra in warm G-inflation and its consistency: stochastic approach
• Constructing warm inflationary model in brane-antibrane system
• Warm Inflation, Neutrinos and Dark matter: a minimal extension of the Standard Model
• Warm Higgs G-inflation: predictions and constraints from Planck 2015 likelihood
• Phenomenology analysis of duration inflation for Tachyon field in loop quantum cosmology
• Note on the super inflation in loop quantum cosmology
• Reconstruction of inflationary scenarios in non-conservative unimodular gravity
• Hitchhiker's Guide to the Swampland: The Cosmologist's Handbook to the string-theoretical Swampland Programme