Quantum formation of primordial black holes

Casadio, Roberto; Giugno, Andrea; Giusti, Andrea; Lenzi, Michele

doi:10.1007/s10714-019-2587-1

Cited by 9 publications

(6 citation statements)

References 44 publications

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“…These objects would be completely dark for any astrophysical purpose, yet they would have no horizon. They could have been produced by direct collapse of primordial perturbations during the inflationary era and subsequently merged to produce primordial black holes [95][96][97][98]. It would thus be interesting to study the phenomenological consequences of our findings.…”

Section: Discussionmentioning

confidence: 98%

Gravitational antiscreening in stellar interiors

Bonanno

Casadio

Platania

2020

J. Cosmol. Astropart. Phys.

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A new class of relativistic stellar structure equations which include the antiscreening effect of the gravitational interaction is presented. Significant modifications in the mass-radius relation for neutron stars can be expected if the running of the Newton coupling due to quantum gravity occurs at low energies. A new Buchdahl limit is derived and its physical implications are discussed. In particular sub-Planckian self-gravitating objects with arbitrarily small radii are possible.

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Section: Discussionmentioning

confidence: 98%

Gravitational antiscreening in stellar interiors

Bonanno

Casadio

Platania

2020

J. Cosmol. Astropart. Phys.

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“…This is just so in the case under study when a value of M is small [36], [37]. In the general case of L ≫ GM, for the event horizon radius of a black hole having the metric (30), r H takes the following form (formula (9) in [38]):…”

Section: Pmm and Primordial Black Holes With The Schwarzschild-de Sit...mentioning

confidence: 94%

Maximal Mass Within Sphere,Repulsion,Black Holes and Some Implications

Shalyt-Margolin

2023

Preprint

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This paper presents one of the approaches to solution of the problem of the repulsion origin in gravity. The approach is based on the property of compactness characteristic for a self-gravitating object in General Relativity. Here we understand compactness as estimation of the upper boundary for mass such an object in a static two--dimensional sphere. Repulsion originates when this boundary is violated. The main hypothesis is formulated in the form of the principle of maximal mass within a two-dimensional static sphere. It is demonstrated that the principle is true for Schwarzschild black holes on absorption of the matter in the process of accretion, both in the classical case and with due regard for quantum-gravitational corrections. The results have been extended to black holes with the Schwarzschild-de Sitter metric in the early Universe. The applicability of the principle suggested is analyzed for the early and for the present Universe.

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“…This is just so in the case under study when a value of M is small [12,13]. In the general case of L ≫ GM, for the event horizon radius of a black hole having the metric (3), r H takes the following form (formula (9) in [14]):…”

Section: Pbh With the Schwarzschild-de Sitter Metric In The Early Uni...mentioning

confidence: 94%

Primordial Black Holes in the Pre-Inflationary Period, the Probabilities of Their Occurrence Taking Into Account Quantum-Gravitational Corrections, and Some Cosmological Implications

Shalyt-Margolin

2024

Preprint

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In the last decades the primordial black holes ({\bf pbhs}) have attracted much attention of cosmologists and astrophysicists. This is associated with origination of such black holes in the early Universe as a result of a gravitational collapse of the high-density matter, making them natural ''detectors'' of the processes involved. In inflationary cosmology of particular importance are {\bf pbhs} originated during the pre-inflationary period. And, since they are small and generated at the energies close to the Planck energies, for them we should take into consideration the quantum-gravitational corrections ({\bf qgcs}). In turn, these corrections change (shift) the inflationary parameters. The paper presents a study of the above-mentioned shifts with regard to these corrections for different scenarios. It is shown that probabilities of occurrence of the {\bf pbhs} under study with due regard for the given {\bf qgcs} are rising as compared to the semiclassical consideration. Besides, high-energy deformations of Friedmann Equations created on the basis of these corrections have been derived for different patterns. Conclusion contains the general remarks concerning the above-mentioned {\bf qgcs} for cosmological parameters and perturbations due to inflation; the steps for their investigation are outlined and the key problems of such a study are formulated.

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Quantum formation of primordial black holes

Cited by 9 publications

References 44 publications

Gravitational antiscreening in stellar interiors

Gravitational antiscreening in stellar interiors

Maximal Mass Within Sphere,Repulsion,Black Holes and Some Implications

Primordial Black Holes in the Pre-Inflationary Period, the Probabilities of Their Occurrence Taking Into Account Quantum-Gravitational Corrections, and Some Cosmological Implications

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