Primordial black holes in loop quantum cosmology: The effect on the threshold

Abstract

Primordial black holes form in the early Universe and constitute one of the most viable candidates for dark matter. The study of their formation process requires the determination of a critical energy density perturbation threshold ${\delta }_{\mathrm{c}}$, which in general depends on the underlying gravity theory. Up to now, the majority of analytic and numerical techniques calculate ${\delta }_{\mathrm{c}}$ within the framework of general relativity. In this work, using simple physical arguments we estimate semi-analytically the PBH formation threshold within the framework of quantum gravity, working for concreteness within loop quantum cosmology (LQC). In particular, for low mass PBHs formed close to the quantum bounce, we find a reduction in the value of ${\delta }_{\mathrm{c}}$ up to $50\%$ compared to the general relativistic regime quantifying for the first time to the best of our knowledge how quantum effects can influence PBH formation within a quantum gravity framework. Finally, by varying the Barbero-Immirzi parameter $\gamma$ of loop quantum gravity (LQG) we show its effect on the value of ${\delta }_{\mathrm{c}}$ while using the observational/phenomenological signatures associated to ultra-light PBHs, namely the ones affected by LQG effects, we propose the PBH portal as a novel probe to constrain the potential quantum nature of gravity.

Accepted in Classical and Quantum Gravity

References in corpus (29)

• Quantum Nature of the Big Bang: Improved dynamics
• Primordial Black Holes as Dark Matter: Recent Developments
• Loop quantum cosmology of k=1 FRW models
• Corrections to the Friedmann Equations from LQG for a Universe with a Free Scalar Field
• Are loop quantum cosmos never singular?
• The Threshold for Primordial Black Hole Formation: a Simple Analytic Prescription
• Non-Singular Bouncing Universes in Loop Quantum Cosmology
• Loop Quantum Cosmology: An Overview
• Gravitational waves induced from primordial black hole fluctuations: The effect of an extended mass function
• Quantum bounce and cosmic recall
• Self-dual Black Holes in LQG: Theory and Phenomenology
• Interaction of the Barbero--Immirzi Field with Matter and Pseudo-Scalar Perturbations
• Dynamics of interacting dark energy model in Einstein and Loop Quantum Cosmology
• Effect of nonlinearity between density and curvature perturbations on the primordial black hole formation
• Quantum nature of cosmological bounces
• Doubly peaked induced stochastic gravitational wave background : Testing baryogenesis from primordial black holes
• No-go for the formation of heavy mass Primordial Black Holes in Single Field Inflation
• Dynamics of interacting phantom scalar field dark energy in Loop Quantum Cosmology
• No constraints for $f(T)$ gravity from gravitational waves induced from primordial black hole fluctuations
• Baryogenesis, Primordial Black Holes and MHz-GHz Gravitational Waves
• GUT-Scale Primordial Black Holes: Mergers and Gravitational Waves
• Covariant Effective Action for Loop Quantum Cosmology from Order Reduction
• Primordial magnetic field generation via primordial black hole disks
• Toward the primordial black hole formation threshold in a time-dependent equation-of-state background
• Effective Actions from Loop Quantum Cosmology: Correspondence with Higher Curvature Gravity
• Threshold of Primordial Black Hole Formation against Velocity Dispersion in Matter-Dominated Era
• Constraining the Barbero-Immirzi parameter from the duration of inflation in loop quantum cosmology
• Gravitational Particle Production in Loop Quantum Cosmology
• Gravitational Particle Production and the Validity of Effective Descriptions in Loop Quantum Cosmology

Cited by in corpus (26)

• Scalar induced gravity waves from ultra slow-roll Galileon inflation
• Primordial regular black holes as all the dark matter. II. Non-time-radial-symmetric and loop quantum gravity-inspired metrics
• Alleviating both $H_0$ and ${\sigma }_8$ tensions in Tsallis cosmology
• Primordial regular black holes as all the dark matter. I. Time-radial-symmetric metrics
• Primordial non-Gaussianity as a saviour for PBH overproduction in SIGWs generated by Pulsar Timing Arrays for Galileon inflation
• Realisation of the ultra-slow roll phase in Galileon inflation and PBH overproduction
• Large fluctuations and Primordial Black Holes
• The Lensing Effect of Quantum-Corrected Black Hole and Parameter Constraints from EHT Observations
• Obviating PBH overproduction for SIGWs generated by Pulsar Timing Arrays in loop corrected EFT of bounce
• Gravitational waves from burdened primordial black holes dark matter
• Primordial Black Hole formation from overlapping cosmological fluctuations
• Constraints from Solar System tests on a covariant loop quantum black hole
• Remnant loop quantum black holes
• Regularized-Renormalized-Resummed loop corrected power spectrum of non-singular bounce with Primordial Black Hole formation
• Light deflection and gravitational lensing effects inspired by loop quantum gravity
• Untangling PBH overproduction in $w$-SIGWs generated by Pulsar Timing Arrays for MST-EFT of single field inflation
• Primordial regular black holes as all the dark matter. III. Covariant canonical quantum gravity models
• Primordial Black Holes from Effective Field Theory of Stochastic Single Field Inflation at NNNLO
• Primordial black holes as cosmic expansion accelerators
• Quasinormal modes of a charged loop quantum black hole
• Negative non-Gaussianity as a salvager for PBHs with PTAs in bounce
• Parameterized quasinormal frequencies and Hawking radiation for axial gravitational perturbations of a holonomy-corrected black hole
• Revisiting primordial black holes formation from preheating instabilities: the case of Starobinsky inflation
• Non-singular naked solutions in quantum spacetime
• Quantum Oppenheimer-Snyder models in loop quantum cosmology with Lorentz term
• Primordial black hole driven cosmic acceleration