Primordial black holes from temporally enhanced curvature perturbation

Abstract

Scalar field with generalized kinetic interactions metamorphoses depending on its field value, ranging from cosmological constant to stiff matter. We show that such a scalar field can give rise to temporal enhancement of the curvature perturbation in the primordial Universe, leading to efficient production of primordial black holes while the enhancement persists. If the inflation energy scale is high, those mini-black holes evaporate by the Hawking radiation much before Big Bang nucleosynthesis and the effective reheating of the Universe is achieved by the black hole evaporation. Dominance of PBHs and the reheating by their evaporation modify the expansion history of the primordial Universe. This results in a characteristic feature of the spectrum of primordial tensor modes in the DECIGO frequency band, opening an interesting possibility of testing PBH reheating scenario by measuring the primordial tensor modes. If the inflation energy scale is low, the PBH mass can be much larger than the solar mass. In this case, PBH is an interesting candidate for seeds for supermassive black holes residing in present galaxies.

25 pages, 3 figures

References in corpus (7)

• Covariant Galileon
• Generalized Galileons: All scalar models whose curved background extensions maintain second-order field equations and stress tensors
• Imperfect Dark Energy from Kinetic Gravity Braiding
• G-inflation: inflation driven by the Galileon field
• Probing reheating temperature of the universe with gravitational wave background
• Primordial black hole formation from an axion-like curvaton model
• Space laser interferometers can determine the thermal history of the early Universe

Cited by in corpus (7)

• Signatures of non-gaussianity in the isocurvature modes of primordial black hole dark matter
• Supermassive black holes formed by direct collapse of inflationary perturbations
• Induced gravitational waves from the cosmic coincidence
• The long-short wavelength mode coupling tightens primordial black hole constraints
• Toward the primordial black hole formation threshold in a time-dependent equation-of-state background
• Primordial black holes as cosmic expansion accelerators
• Primordial black hole driven cosmic acceleration