Dark Matter from Entropy Perturbations in Curved Field Space

Abstract

The accumulated energy density of the excited entropy modes in multiple field inflationary scenarios can play the role of dark matter. In the usual case of a flat field space without any turning trajectory, only light superhorizon entropy modes can be excited through the gravitational instability. In the case of a negatively curved field space, we show that subhorizon entropy modes can be excited as well through the tachyonic instability induced by the negative curvature of the field space. The latter allows for production of entropy modes with masses larger than or at the order of the Hubble expansion rate during inflation, leading to a new dark matter scenario. Due to the contribution of subhorizon modes, the corresponding spectral density has a peak at a scale smaller than its counterpart in the models based on a flat field space. This difference makes our model observationally distinguishable.

26+7 pages, 8 figures, 2 appendices, matches published version

References in corpus (15)

• Perturbations in generalized multi-field inflation
• Conformal Transformations with Multiple Scalar Fields
• Primordial Bispectrum from Multifield Inflation with Nonminimal Couplings
• Strongly Coupled Perturbations in Two-Field Inflationary Models
• Primordial Non-Gaussianities of General Multiple Field Inflation
• Primordial perturbations from inflation with a hyperbolic field-space
• Spectator Dark Matter
• Earth as a transducer for dark-photon dark-matter detection
• On the inflationary massive field with a curved field manifold
• Primordial Non-Gaussianities from the Trispectra in Multiple Field Inflationary Models
• Constraint on Vector Coherent Oscillation Dark Matter with Kinetic Function
• Geometrical destabilization, premature end of inflation and Bayesian model selection
• Gravitational production of nearly thermal fermionic Dark Matter
• Perturbations of ultralight vector field dark matter
• Testing Two-Field Inflation

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