Primordial black holes as dark matter: converting constraints from monochromatic to extended mass distributions

Bellomo, Nicola; Bernal, José Luís; Raccanelli, Alvise; Verde, Licia

doi:10.1088/1475-7516/2018/01/004

Cited by 118 publications

(150 citation statements)

References 71 publications

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“…Therefore the improvements on the modelling are much more important than improvements on the observational constraints. Moreover, given that abundance constraints for PBHs with extended mass distributions are typically of the same order of magnitude of those for monochromatic ones [60][61][62], the use of the former will not shift significantly our predictions. Figure 6 also shows that the range of power spectrum amplitudes needed to generate PBHs as (a component of) the dark matter, can be probed by future experiments, as SKA and LISA.…”

Section: The Reconstruction Of Primordial Power Spectrum Amplitude Anmentioning

confidence: 93%

From primordial black holes abundance to primordial curvature power spectrum (and back)

Kalaja

Bellomo

Bartolo

et al. 2019

J. Cosmol. Astropart. Phys.

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108

105

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In the model where Primordial Black Holes (PBHs) form from large primordial curvature (C) perturbations, i.e., CPBHs, constraints on PBH abundance provide in principle constraints on the primordial curvature power spectrum. This connection however depends necessarily on the details of PBH formation mechanism. In this paper we provide, for the first time, constraints on the primordial curvature power spectrum from the latest limits on PBH abundance, taking into account all the steps from gravitational collapse in real space to PBH formation. In particular, we use results from numerical relativity simulations and peak theory to study the conditions for PBH formation for a range of perturbation shapes, including nonlinearities, perturbation profile and a careful treatment of smoothing and filtering scales. We then obtain updated PBH formation conditions and translate that into primordial spectrum constraints for a wide range of shapes and abundances. These updated constraints cover a range of scales not probed by other cosmological observables. Our results show that the correct and accurate modelling of non-linearities, filtering and typical perturbation profile, is crucial for deriving meaningful cosmological implications.

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Section: The Reconstruction Of Primordial Power Spectrum Amplitude Anmentioning

confidence: 93%

From primordial black holes abundance to primordial curvature power spectrum (and back)

Kalaja

Bellomo

Bartolo

et al. 2019

J. Cosmol. Astropart. Phys.

Self Cite

108

105

View full text Add to dashboard Cite

show abstract

“…In what follows we consider the simplifying assumption of a monochromatic mass function for PBHs, broadly used in the literature. Note, however, that this is not necessarily a realistic assumption, since many mechanisms of PBH formation in the early Universe would generically lead to extended mass distributions, which could bias the obtained constraints [28,63,64,66].…”

Section: Iii1 Global Heating and Ionizationmentioning

confidence: 99%

Constraining the primordial black hole abundance with 21-cm cosmology

et al. 2019

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The discoveries of a number of binary black hole mergers by LIGO and VIRGO has reinvigorated the interest that primordial black holes (PBHs) of tens of solar masses could contribute non-negligibly to the dark matter energy density. Should even a small population of PBHs with masses O(M ) exist, they could profoundly impact the properties of the intergalactic medium and provide insight into novel processes at work in the early Universe. We demonstrate here that observations of the 21cm transition in neutral hydrogen during the epochs of reionization and cosmic dawn will likely provide one of the most stringent tests of solar mass PBHs. In the context of 21cm cosmology, PBHs give rise to three distinct observable effects: (i) the modification to the primordial power spectrum (and thus also the halo mass function) induced by Poisson noise, (ii) a uniform heating and ionization of the intergalactic medium via X-rays produced during accretion, and (iii) a local modification to the temperature and density of the ambient medium surrounding isolated PBHs. Using a four-parameter astrophysical model, we show that experiments like SKA and HERA could potentially improve upon existing constraints derived using observations of the cosmic microwave background by more than one order of magnitude. I. INTRODUCTIONThe canonical cosmological model assumes that dark matter is comprised of a cold gas of weakly interacting particles. Despite its simplicity, this minimal scenario provides an excellent fit to both cosmic microwave background (CMB) and large-scale structure measurements [1][2][3][4]. However, a precise understanding of the fundamental nature of dark matter is missing and remains at the forefront in the current list of unsolved problems in modern physics.Although dark matter is usually interpreted in terms of a new elementary particle, other alternatives exist. Black holes (BHs) produced prior to big bang nucleosynthesis (BBN), i.e., primordial black holes (PBHs), represent such an alternative -remarkably, this solution is as old as particle dark matter [5]. In particular, this scenario has recently attracted much attention [6][7][8][9][10][11][12] in the context of the LIGO and VIRGO discoveries of several binary BH mergers [13][14][15][16][17].The idea that PBHs could be formed by strong accretion during the radiation-dominated epoch was first introduced five decades ago [18]. It was later suggested that initial fluctuations in the early Universe could give rise to a large number of gravitationally collapsed objects with masses above the Planck mass [19], that however, would not grow substantially by accretion [20]. Very light PBHs would not survive until the present epoch, though; the prediction that any BH should emit particles with a black body spectrum [21,22] implies that PBHs with masses below 10 −18 M (with M the Sun's mass) would have evaporated on cosmological times scales [21][22][23]. While the evaporation of such light PBHs would have interesting observational consequences [24][25][26], only heavier PBHs coul...

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“…We also obtained constraints for extended mass functions to study the effects related to the width of the peak. Some pioneering work has been done in [12][13][14][15] concerning extended mass functions, predicting that the constraints on an extended distribution should be more stringent than the expected constraint resulting from the addition of monochromatic distributions. The conclusion of these papers is that a simple conversion from monochromatic to extended mass functions is not analytically trivial.…”

Section: B Extended Pbh Distributionmentioning

confidence: 99%

Constraining primordial black hole masses with the isotropic gamma ray background

2020

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Primordial black holes can represent all or most of the dark matter in the window 10 17 − 10 22 g. Here we present an extension of the constraints on PBHs of masses 10 13 − 10 18 g arising from the isotropic diffuse gamma ray background. Primordial black holes evaporate by emitting Hawking radiation that should not exceed the observed background. Generalizing from monochromatic distributions of Schwarzschild black holes to extended mass functions of Kerr rotating black holes, we show that the lower part of this mass window can be closed for near-extremal black holes.

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Primordial black holes as dark matter: converting constraints from monochromatic to extended mass distributions

Cited by 118 publications

References 71 publications

From primordial black holes abundance to primordial curvature power spectrum (and back)

From primordial black holes abundance to primordial curvature power spectrum (and back)

Constraining the primordial black hole abundance with 21-cm cosmology

Constraining primordial black hole masses with the isotropic gamma ray background

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