Primordial black holes with anisotropic hair

Abstract

A mechanism for generating anisotropic enhancements of the curvature perturbation through a vector field is proposed. We find that when the mixing between the inflaton perturbation and the vector-field perturbation is sufficiently strong in the anisotropic inflation, the power spectrum becomes dominated by anisotropic constant modes. This suggests that statistical anisotropy in primordial black hole (PBH) formation may be inevitable if inflation undergoes an anisotropic inflationary phase. Our findings offer a novel approach to probe vector fields during inflation and to test the cosmic no-hair conjecture.

6 pages+5 pages of Supplementary Materials, 2 figures. Final version published in PRD Letter

References in corpus (19)

• The Effective Field Theory of Inflation
• Primordial Black Holes as Dark Matter
• Inflationary Universe with Anisotropic Hair
• The Nature of Primordial Fluctuations from Anisotropic Inflation
• Generating PBHs and small-scale GWs in two-field models of inflation
• Scalar-Scalar, Scalar-Tensor, and Tensor-Tensor Correlators from Anisotropic Inflation
• Inflationary perturbations in anisotropic backgrounds and their imprint on the CMB
• Inflation and Primordial Black Holes
• Anisotropic Power-law Inflation
• Heavy fields, reduced speeds of sound and decoupling during inflation
• Imprints of anisotropic inflation on the cosmic microwave background
• Effective field theory of weakly coupled inflationary models
• The rapid-turn inflationary attractor
• Primordial Fluctuations from Inflation with a Triad of Background Gauge Fields
• Scalar perturbations from inflation in the presence of gauge fields
• Induced gravitational waves from statistically anisotropic scalar perturbations
• Geometric structure of multi-form-field isotropic inflation and primordial fluctuations
• Enhanced power spectra from multi-field inflation
• Inflation with vector fields revisited: heavy entropy perturbations and primordial black holes