Microlensing of x-ray pulsars: A method to detect primordial black hole dark matter

Bai, Y.; Orlofsky, Nicholas

doi:10.1103/physrevd.99.123019

Cited by 29 publications

(20 citation statements)

References 92 publications

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“…These bounds will not be sensitive to the presence of the EWS corona [92,93], especially because the corona is inside the Einstein radius. Eventually, microlensing of X-ray pulsars [94] and femtolensing [95] or lensing parallax [96] of gamma ray bursts could set bounds down to…”

Section: Resultsmentioning

confidence: 99%

Phenomenology of magnetic black holes with electroweak-symmetric coronas

Bai

Berger

Korwar

et al. 2020

J. High Energ. Phys.

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Magnetically charged black holes (MBHs) are interesting solutions of the Standard Model and general relativity. They may possess a “hairy” electroweak-symmetric corona outside the event horizon, which speeds up their Hawking radiation and leads them to become nearly extremal on short timescales. Their masses could range from the Planck scale up to the Earth mass. We study various methods to search for primordially produced MBHs and estimate the upper limits on their abundance. We revisit the Parker bound on magnetic monopoles and show that it can be extended by several orders of magnitude using the large-scale coherent magnetic fields in Andromeda. This sets a mass-independent constraint that MBHs have an abundance less than 4 × 10−4 times that of dark matter. MBHs can also be captured in astrophysical systems like the Sun, the Earth, or neutron stars. There, they can become non-extremal either from merging with an oppositely charged MBH or absorbing nucleons. The resulting Hawking radiation can be detected as neutri- nos, photons, or heat. High-energy neutrino searches in particular can set a stronger bound than the Parker bound for some MBH masses, down to an abundance 10−7 of dark matter.

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Section: Resultsmentioning

confidence: 99%

Phenomenology of magnetic black holes with electroweak-symmetric coronas

Bai

Berger

Korwar

et al. 2020

J. High Energ. Phys.

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“…Thus, there is a large gap between our result and the next constraint, at M PBH ¼ 10 23 g, from Subaru microlensing data [19,24], where PBHs are currently allowed to make up all the DM. Many ideas have been proposed in order to constrain PBHs in this and higher-mass windows [87][88][89][90][91][92][93][94][95][96][97]. Additionally, we note that our constraints would be tighter for highly spinning PBHs.…”

Section: B Ultralight Pbhsmentioning

confidence: 92%

INTEGRALconstraints on primordial black holes and particle dark matter

2020

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The International Gamma-Ray Astrophysics Laboratory (INTEGRAL) satellite has yielded unprecedented measurements of the soft gamma-ray spectrum of our Galaxy. Here we use those measurements to set constraints on dark matter (DM) that decays or annihilates into photons with energies E ≈ 0.02-2 MeV. First, we revisit the constraints on particle DM that decays or annihilates to photon pairs. In particular, for decaying DM, we find that previous limits were overstated by roughly an order of magnitude. Our new, conservative analysis finds that the DM lifetime must satisfy τ ≳ 5 × 10 26 s × ðm χ =MeVÞ −1 for DM masses m χ ¼ 0.054-3.6 MeV. For MeV-scale DM that annihilates into photons INTEGRAL sets the strongest constraints to date. Second, we target ultralight primordial black holes (PBHs) through their Hawking radiation. This makes them appear as decaying DM with a photon spectrum peaking at E ≈ 5.77=ð8πGM PBH Þ, for a PBH of mass M PBH. We use the INTEGRAL data to demonstrate that, at 95% C.L., PBHs with masses less than 1.2 × 10 17 g cannot comprise all of the DM, setting the tightest bound to date on ultralight PBHs.

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“…There exist numerous observational constraints on the fraction of DM comprised of PBHs ( [8][9][10][11][12][13][14][15][16][17][18][19][20], see recent reviews [21][22][23] and references therein), however, there still exists parameter space where PBHs can form all of the DM [11,24,25]. Multiple ideas have also been proposed in order to probe PBHs in various mass ranges [26][27][28][29]. Given this increased scrutiny of PBHs (which started after the direct detection of gravitational waves [30,31] and the subsequent proposal that these BHs are primordial in nature [32][33][34][35]), it is obvious to ask if we have explored all the properties of BHs in our searches for PBHs.…”

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confidence: 99%

Neutrino and Positron Constraints on Spinning Primordial Black Hole Dark Matter

2020

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Primordial black holes can have substantial spin-a fundamental property that has a strong effect on its evaporation rate. We conduct a comprehensive study of the detectability of primordial black holes with non-negligible spin, via the searches for the neutrinos and positrons in the MeV energy range. Diffuse supernova neutrino background searches and observation of the 511 keV gamma-ray line from positrons in the Galactic center set competitive constraints. Spinning primordial black holes are probed up to a slightly higher mass range compared to nonspinning ones. Our constraint using neutrinos is slightly weaker than that due to the diffuse gamma-ray background, but complementary and robust. Our positron constraints are typically weaker in the lower mass range and stronger in the higher mass range for the spinning primordial black holes compared to the nonspinning ones. They are generally stronger than those derived from the diffuse gamma-ray measurements for primordial black holes having masses greater than a few ×10 16 g.

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Microlensing of x-ray pulsars: A method to detect primordial black hole dark matter

Cited by 29 publications

References 92 publications

Phenomenology of magnetic black holes with electroweak-symmetric coronas

Phenomenology of magnetic black holes with electroweak-symmetric coronas

INTEGRALconstraints on primordial black holes and particle dark matter

Neutrino and Positron Constraints on Spinning Primordial Black Hole Dark Matter

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