Effects of cosmological moduli fields on cosmic microwave background

By T. Moroi, Tomo Takahashi. 2001

849 citations recorded by the source corpus.

Abstract We discuss effects of cosmological moduli fields on the cosmic microwave background (CMB). If a modulus field φ once dominates the universe, the CMB we observe today is from the decay of φ and its anisotropy is affected by the primordial fluctuation in the amplitude of the modulus field. Consequently, constraints on the inflaton potential from the CMB anisotropy can be relaxed. In particular, the scale of the inflation may be significantly lowered. In addition, with the cosmological moduli fields, correlated mixture of adiabatic and isocurvature fluctuations may be generated, which results in enhanced CMB angular power spectrum at higher multipoles relative to that of lower ones. Such an enhancement can be an evidence of the cosmological moduli fields, and may be observed in future satellite experiments.

Subfields: Astronomy and Astrophysics, Atomic and Molecular Physics, and Optics

View Paper: https://www.semanticscholar.org/paper/0f0bed9b5aea16e47d9f5b694f087169e370be41

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Citations in the corpus

Non-Gaussianity in curvaton models with nearly quadratic potentials (2005, neutral): “∗E-mail: kari.enqvist@helsinki.fi †E-mail: sami.nurmi@helsinki.fi Contents”
Volume modulus inflation and the gravitino mass problem (2008, methodology): “To make our model fully realistic, one may consider the second field to be a curvaton and later on having the isocurvature perturbations converted to adiabatic perturbations [40].”
Planck 2015 results. XVII. Constraints on primordial non-Gaussianity (2015, positive): “An alternative, important possibility is the curvaton model (Mollerach 1990; Linde & Mukhanov 1997; Enqvist & Sloth 2002; Lyth & Wands 2002; Moroi & Takahashi 2001).”
Inflation and String Theory (2014, background): “The constraint strengthens if S and R are perfectly correlated (as in curvaton isocurvature models [131,132]),”
Scale-invariant cosmological perturbations from Hořava-Lifshitz gravity without inflation (2009, methodology): “For this purpose we invoke the curvaton mechanism [9, 10, 11] or/and the modulated decay of heavy particles/oscillating fields.”
Review of local non-Gaussianity from multi-field inflation (2010, background): “This is the basis of the curvaton scenario [55–59] which liberates the inflaton field from being required to generate the observed spectrum of perturbations (although there is instead an upper bound on their allowed magnitude).”
Planck 2018 results. IX. Constraints on primordial non-Gaussianity (2019, methodology): “For the constant resonance model, we use the method of Münchmeyer et al. (2015), which expands the logarithmic oscillations in terms of separable linear oscillations.”
Multi-field conformal cosmological attractors (2013, background): “In that case, they may serve the role of isocurvature perturbations [28], or may become responsible for the curvaton mechanism of generation of adiabatic perturbations [29,30].”
Gauge field production in supergravity inflation: Local non-Gaussianity and primordial black holes (2012, methodology): “If not only the inflaton but some other scalar field has a mass much smaller than H during inflation, one may use it as a curvaton field [25] for generation of non-Gaussian perturbations in this class of models [26].”