Constraints on primordial black holes for nonstandard cosmologies

Abstract

We study how the bounds on the abundance of Primordial Black Holes (PBHs) and the constraints on power spectrum are modified if a non-standard evolution phase takes place between the end of inflation and the Standard radiation-dominated (RD) universe after inflation. The constraints on PBH abundance and power spectrum are computed using the new, freely available, \href{https://github.com/TadeoDGAguilar/PBHBeta}{\faGithubSquare}~\texttt{PBHBeta} library, which accounts for the effects of non-standard expansion and specific criteria for PBH formation in such non-standard scenarios. As working examples, we consider three different cases: a pure matter-dominated (MD) phase, a scalar field-dominated ($\phi$D) universe, and a stiff fluid-dominated (SD) scenario. While the background expansion is the same for the MD and $\phi$D scenarios, the PBH formation criteria lead to different constraints to power spectrum. On the other hand, the duration of the non-standard expansion phase alters the bounds, with longer MD periods resulting in weaker constraints on power spectrum, and longer SD scenarios leading to an enhanced abundance due to the dust-like redshifting of PBHs. The modifications to the constraints are reported in all cases and we highlight those where the power spectrum may be significantly constrained.

V2: Version accepted for publication in JCAP

References in corpus (22)

• Reheating in Inflationary Cosmology: Theory and Applications
• Nonperturbative Dynamics Of Reheating After Inflation: A Review
• Primordial black hole formation in the radiative era: investigation of the critical nature of the collapse
• The Threshold for Primordial Black Hole Formation: a Simple Analytic Prescription
• Generalised constraints on the curvature perturbation from primordial black holes
• Induced gravitational waves as a probe of thermal history of the universe
• Inflaton Fragmentation and Oscillon Formation in Three Dimensions
• Gravitational waves induced from primordial black hole fluctuations: The effect of an extended mass function
• Primordial black holes from inflaton and spectator field perturbations in a matter-dominated era
• Primordial Black Holes
• Generation of Coherent Structures After Cosmic Inflation
• Non-standard primordial fluctuations and nongaussianity in string inflation
• Primordial Black Holes in Matter-Dominated Eras: the Role of Accretion
• Primordial Black Holes from CDM Isocurvature Perturbations
• Formation of inflaton halos after inflation
• Inflaton fragmentation: Emergence of pseudo-stable inflaton lumps (oscillons) after inflation
• A new mechanism for primordial black hole formation during reheating
• Threshold of Primordial Black Hole Formation against Velocity Dispersion in Matter-Dominated Era
• Primordial Black Hole Formation in Non-Standard Post-Inflationary Epochs
• Small-scale clustering of Primordial Black Holes: cloud-in-cloud and exclusion effects
• Production of PBHs from inflaton structure
• Reheating, Dark Matter and Baryon Asymmetry: a Triple Coincidence in Inflationary Models

Cited by in corpus (3)

• From formation to evaporation: Induced gravitational wave probes of the primordial black hole reheating scenario
• Induced gravitational waves and baryon asymmetry fluctuations from primordial black hole formation
• Axion dark matter with not quite black hole domination