Revisiting the constraints on primordial black hole abundance with the isotropic gamma ray background

Chen, Siyu; Zhang, Hong-Hao; Long, Guangbo

doi:10.48550/arxiv.2112.15463

Cited by 5 publications

(13 citation statements)

References 41 publications

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“…18, shows a selection of the strongest constraints on low-mass 4D PBHs from previous work. This region combines constraints set with BBN [97], CMB anisotropies [49], isotropic photons [60], galactic centre photons [55], and galactic centre positron annihilation [57]. These are generally very similar to the strongest constraints set in this work, although there are a few differences worth noting.…”

Section: Comparison With Prior Four-dimensional Resultssupporting

confidence: 59%

“…Therefore, there appears to be an isotropic component equivalent to the flux in the direction with the smallest contribution from galactic PBHs. This isotropic galactic signal has recently been used to constraint the abundance of long-lived four-dimensional PBHs [59,60]. FIG.…”

Section: B Isotropic Background Lightmentioning

confidence: 99%

“…This approach leads to conservative constraints on the PBH abundance because no assumptions are made about other astrophysical sources of X-rays and gamma-rays. Including models of astrophysical X-ray and gamma-ray sources can strengthen PBH constraints by more than an order of magnitude [59,60].…”

Section: Observational Constraintsmentioning

confidence: 99%

“…The grey shaded region shows the constraints on 4D PBHs set in previous work. These include BBN [97], CMB anisotropies [49], isotropic background light [60], galactic centre photons [55], and positron annihilations in the galactic centre [57].…”

Section: F Other Constraintsmentioning

confidence: 99%

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Primordial Black Hole Dark Matter in the Context of Extra Dimensions

Friedlander,

Mack,

Schon

et al. 2022

Preprint

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Theories of large extra dimensions (LEDs) such as the Arkani-Hamed, Dimopoulos & Dvali scenario predict a "true" Planck scale M near the TeV scale, while the observed M pl is due to the geometric effect of compact extra dimensions. These theories allow for the creation of primordial black holes (PBHs) in the early Universe, from the collisional formation and subsequent accretion of black holes in the high-temperature plasma, leading to a novel cold dark matter (sub)component. Because of their existence in a higher-dimensional space, the usual relationship between mass, radius and temperature is modified, leading to distinct behaviour with respect to their 4-dimensional counterparts. Here, we derive the cosmological creation and evolution of such PBH candidates, including the greybody factors describing their evaporation, and obtain limits on LED PBHs from direct observation of evaporation products, effects on big bang nucleosynthesis, and the cosmic microwave background angular power spectrum. Our limits cover scenarios of 2 to 6 extra dimensions, and PBH masses ranging from 1 to 10 22 g. We find that for two extra dimensions, LED PBHs represent a viable dark matter candidate with a range of possible black hole masses between 10 18 and 10 24 g depending on the Planck scale and reheating temperature. For M = 10 TeV, this corresponds to PBH dark matter with a mass of M 10 22 g, unconstrained by current observations. We further refine and update constraints on "ordinary" four-dimension black holes.

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Section: Comparison With Prior Four-dimensional Resultssupporting

confidence: 59%

Section: B Isotropic Background Lightmentioning

confidence: 99%

Section: Observational Constraintsmentioning

confidence: 99%

Section: F Other Constraintsmentioning

confidence: 99%

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Primordial Black Hole Dark Matter in the Context of Extra Dimensions

Friedlander,

Mack,

Schon

et al. 2022

Preprint

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“…However, this contribution only has an effect on the low energy tail of spectra for the lowest PBH masses considered here. Therefore, our results are not significantly altered by such update of the code, as also shown in [21].…”

supporting

confidence: 64%

Strong constraints on primordial black hole dark matter from 16 years of INTEGRAL/SPI observations

Berteaud,

Calore,

Iguaz

et al. 2022

Preprint

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We present a new analysis of the diffuse soft γ-ray emission towards the inner Galaxy as measured by the SPectrometer aboard the INTEGRAL satellite (SPI) with 16 years of data taking. The analysis implements a spatial template fit of SPI data and an improved instrumental background model. We characterize the contribution of Primordial Black Holes (PBH) as dark matter (DM) candidates evaporating into O(1) MeV photons by including, for the first time, the spatial distribution of their signal into the fitting procedure. No PBH signal is detected, and we set the strongest limit on PBH DM for masses up to 4 × 10 17 g, significantly closing in into the so-called asteroid mass range.

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Limits on primordial black holes detectability with Isatis: a BlackHawk tool

Auffinger

2022

Eur. Phys. J. C

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Primordial black holes (PBHs) are convenient candidates to explain the elusive dark matter (DM). However, years of constraints from various astronomical observations have constrained their abundance over a wide range of masses, leaving only a narrow window open at $$10^{17}\,\mathrm{g} \lesssim M \lesssim 10^{22}\,$$ 10 17 g ≲ M ≲ 10 22 g for all DM in the form of PBHs. We reexamine this disputed window with a critical eye, interrogating the general hypotheses underlying the direct photon constraints. We review 4 levels of assumptions: (i) instrument characteristics, (ii) prediction of the (extra)galactic photon flux, (iii) statistical method of signal-to-data comparison and (iv) computation of the Hawking radiation rate. Thanks to , a new tool designed for the public Hawking radiation code , we first revisit the existing and prospective constraints on the PBH abundance and investigate the impact of assumptions (i)–(iv). We show that the constraints can vary by several orders of magnitude, advocating the necessity of a reduction of the theoretical sources of uncertainties. Second, we consider an “ideal” instrument and we demonstrate that the PBH DM scenario can only be constrained by the direct photon Hawking radiation phenomenon below $$M_{\mathrm{max}} \sim 10^{20}\,$$ M max ∼ 10 20 g. The upper part of the mass window should therefore be closed by other means.

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Revisiting the constraints on primordial black hole abundance with the isotropic gamma ray background

Cited by 5 publications

References 41 publications

Primordial Black Hole Dark Matter in the Context of Extra Dimensions

Primordial Black Hole Dark Matter in the Context of Extra Dimensions

Strong constraints on primordial black hole dark matter from 16 years of INTEGRAL/SPI observations

Limits on primordial black holes detectability with Isatis: a BlackHawk tool

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