A new direction for dark matter research: intermediate-mass compact halo objects

Chapline, George; Frampton, Paul H.

doi:10.1088/1475-7516/2016/11/042

Cited by 31 publications

(25 citation statements)

References 52 publications

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“…Let us focus on the variables ζ ij 2 . There are 6 independent variables ζ A 2 := (ζ 11 2 , ζ 22 2 , ζ 33 2 , ζ 12 2 , ζ 23 2 , ζ 31 2 ). It can be shown that, taking the principal direction of the matrix ζ ij 2 , the volume element can be rewritten as follows:…”

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confidence: 99%

Primordial black hole abundance from random Gaussian curvature perturbations and a local density threshold

Yoo

Harada

Garriga

et al. 2018

Progress of Theoretical and Experimental Physics

153

195

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The production rate of primordial black holes is often calculated by considering a nearly Gaussian distribution of cosmological perturbations, and assuming that black holes will form in regions where the amplitude of such perturbations exceeds a certain threshold. A threshold ζ th for the curvature perturbation is somewhat inappropriate for this purpose, because it depends significantly on environmental effects, not essential to the local dynamics. By contrast, a threshold δ th for the density perturbation at horizon crossing seems to provide a more robust criterion. On the other hand, the density perturbation is known to be bounded above by a maximum limit δ max at the horizon entry, and given that δ th is comparable to δ max , the density perturbation will be far from Gaussian near or above the threshold. In this paper, we provide a new plausible estimate for the primordial black hole abundance based on peak theory. In our approach, we assume that the curvature perturbation is given as a random Gaussian field with the power spectrum characterized by a single scale, while an optimized criterion for PBH formation is imposed, based on the locally averaged density perturbation around the nearly spherically symmetric high peaks. Both variables are related by the full nonlinear expression derived in the long-wavelength approximation of general relativity. We do not introduce a window function which is usually introduced to obtain the scale dependence of the spectrum. The scale of the inhomogeneity is introduced as a random variable in the peak theory, and the scale dependent PBH fraction is automatically induced. We find that the mass spectrum is shifted to larger mass scales by one order of magnitude or so, compared to a conventional calculation. The abundance of PBHs becomes significantly larger than the conventional one, by many orders of magnitude, mainly due to the optimized criterion for PBH formation and the removal of the suppression associated with a window function.

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confidence: 99%

Primordial black hole abundance from random Gaussian curvature perturbations and a local density threshold

Yoo

Harada

Garriga

et al. 2018

Progress of Theoretical and Experimental Physics

153

195

View full text Add to dashboard Cite

show abstract

“…The lack of evidence for elementary particles that could explain dark matter (see Frampton, 2016, Chapline & Frampton, 2016, and references therein) and the detection of gravitational waves by the LIGO experiment produced by black holes (Abbott et al 2016), have recently renewed interest in the possibility that dark matter could consist of primordial black holes (hereafter PBH) in the intermediate-mass range 1M < M < 1000M (Carr et al 2016). Lower masses are excluded by galactic microlensing experiments (e.g.…”

Section: Introductionmentioning

confidence: 99%

Limits on the Mass and Abundance of Primordial Black Holes from Quasar Gravitational Microlensing

Mediavilla

Jiménez-Vicente

Muñoz

et al. 2017

ApJL

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The idea that dark matter can be made of intermediate-mass primordial black holes in the 10M M 200M range has recently been reconsidered, particularly in the light of the detection of gravitational waves by the LIGO experiment. The existence of even a small fraction of dark matter in black holes should nevertheless result in noticeable quasar gravitational microlensing. Quasar microlensing is sensitive to any type of compact objects in the lens galaxy, to their abundance, and to their mass. We have analyzed optical and X-ray microlensing data from 24 gravitationally lensed quasars to estimate the abundance of compact objects in a very wide range of masses. We conclude that the fraction of mass in black holes or any type of compact objects is negligible outside of the 0.05M M 0.45M mass range and that it amounts to 20 ± 5% of the total matter, in agreement with the expected masses and abundances of the stellar component. Consequently, the existence of a significant population of intermediate-mass primordial black holes appears to be inconsistent with current microlensing observations. Therefore, primordial massive black holes are a very unlikely source of the gravitational radiation detected by LIGO.

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“…However, there is currently no appealing evidence for DM of particle nature [11], including the direct detections (LUX [12], PandaX [13], XENON1T [14], CDMS [15], ADMX [16]), indirect detections (ICECUBE [17], Pamela [18], AMS [19], DAMPE [20]) and collider search (LHC). The above dilemma naturally leads us to an alternative possibility that DM might be of non-particle nature [21], and only participates the gravitational interaction. The most promising candidate along this direction is the primordial black holes (PBHs) [22][23][24].…”

Section: Introductionmentioning

confidence: 99%

Sensitivity of primordial black hole abundance on the reheating phase

2018

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We investigate the sensitivity of reheating history on the abundance of primordial black holes (PBHs). Contrary to the monochromatic case of mass fraction of PBH, reheating era with different e-folding and equation-of-state can have a substantial impact on the abundance of PBH with an extended mass fraction. We demonstrate explicitly this reheating sensitivity in an illustrative model of single field inflation with a quasi-inflection point, and find that both the peak position and amplitude of the extended mass fraction as well as the abundance of PBH in DM can vary by many orders of magnitude, which adds another layer of uncertainty on the PBH scenarios as dark matter.

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A new direction for dark matter research: intermediate-mass compact halo objects

Cited by 31 publications

References 52 publications

Primordial black hole abundance from random Gaussian curvature perturbations and a local density threshold

Primordial black hole abundance from random Gaussian curvature perturbations and a local density threshold

Limits on the Mass and Abundance of Primordial Black Holes from Quasar Gravitational Microlensing

Sensitivity of primordial black hole abundance on the reheating phase

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