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Publications (3 of 3) Show all publications
Boucenna, S. M., Kühnel, F., Ohlsson, T. & Visinelli, L. (2018). Novel constraints on mixed dark-matter scenarios of primordial black holes and WIMPs. Journal of Cosmology and Astroparticle Physics (7), Article ID 003.
Open this publication in new window or tab >>Novel constraints on mixed dark-matter scenarios of primordial black holes and WIMPs
2018 (English)In: Journal of Cosmology and Astroparticle Physics, ISSN 1475-7516, E-ISSN 1475-7516, no 7, article id 003Article in journal (Refereed) Published
Abstract [en]

We derive constraints on mixed dark-matter scenarios consisting of primordial black holes (PBHs) and weakly interacting massive particles (WIMPs). In these scenarios, we expect a density spike of the WIMPs that are gravitationally bound to the PBHs, which results in an enhanced annihilation rate and increased indirect detection prospects. We show that such scenarios provide strong constraints on the allowed fraction of PBHs that constitutes the dark matter, depending on the WIMP mass m(x) and the velocity-averaged annihilation cross-section <sigma v >. For the standard scenario with m(x) = 100 GeV and <sigma v > = 3 x 10(-26) cm(3)/s, we derive bounds that are stronger than all existing bounds for PBHs with masses 10(-12) M-circle dot less than or similar to M-BH less than or similar to 10(4) where M-circle dot, is the solar mass, and mostly so by several orders of magnitude.

Place, publisher, year, edition, pages
IOP PUBLISHING LTD, 2018
Keywords
dark matter theory, primordial black holes
National Category
Subatomic Physics
Identifiers
urn:nbn:se:kth:diva-232405 (URN)10.1088/1475-7516/2018/07/003 (DOI)000437299100003 ()2-s2.0-85051711141 (Scopus ID)
Note

QC 20180726

Available from: 2018-07-26 Created: 2018-07-26 Last updated: 2018-10-16Bibliographically approved
Kuhnel, F. & Freese, K. (2017). Constraints on primordial black holes with extended mass functions. Physical Review D: covering particles, fields, gravitation, and cosmology, 95(8), Article ID 083508.
Open this publication in new window or tab >>Constraints on primordial black holes with extended mass functions
2017 (English)In: Physical Review D: covering particles, fields, gravitation, and cosmology, ISSN 2470-0010, E-ISSN 2470-0029, Vol. 95, no 8, article id 083508Article in journal (Refereed) Published
Abstract [en]

Constraints on primordial black holes in the range 10(-18) M circle dot to 10(3) M circle dot are reevaluated for a general class of extended mass functions. Whereas previous work has assumed that PBHs are produced with one single mass, instead there is expected to be a range of masses even in the case of production from a single mechanism; constraints therefore change from previous literature. Although tightly constrained in the majority of cases, it is shown that, even under conservative assumptions, primordial black holes in the mass range 10(-10) M circle dot to 10(-8) M circle dot could still constitute the entirety of the dark matter. This stresses both the importance for a comprehensive reevaluation of all respective constraints that have previously been evaluated only for a monochromatic mass function and the need to obtain more constraints in the allowed mass range.

Place, publisher, year, edition, pages
AMER PHYSICAL SOC, 2017
National Category
Physical Sciences
Identifiers
urn:nbn:se:kth:diva-210943 (URN)10.1103/PhysRevD.95.083508 (DOI)000403666800002 ()2-s2.0-85021652613 (Scopus ID)
Note

QC 20170714

Available from: 2017-07-14 Created: 2017-07-14 Last updated: 2018-09-19Bibliographically approved
Kuhnel, F. & Ohlsson, T. (2017). Signatures of compact halos of sterile-neutrino dark matter. Physical Review D: covering particles, fields, gravitation, and cosmology, 96(10), Article ID 103020.
Open this publication in new window or tab >>Signatures of compact halos of sterile-neutrino dark matter
2017 (English)In: Physical Review D: covering particles, fields, gravitation, and cosmology, ISSN 2470-0010, E-ISSN 2470-0029, Vol. 96, no 10, article id 103020Article in journal (Refereed) Published
Abstract [en]

We investigate compact halos of sterile-neutrino dark matter and examine observable signatures with respect to neutrino and photon emission. Primarily, we consider two cases: primordial black-hole halos and ultracompact minihalos. In both cases, we find that there exists a broad range of possible parameter choices such that detection in the near future with x-ray and gamma-ray telescopes might be well possible. In fact, for energies above 10 TeV, the neutrino telescope IceCube would be a splendid detection machine for such macroscopic dark-matter candidates.

Place, publisher, year, edition, pages
American Physical Society, 2017
National Category
Physical Sciences
Identifiers
urn:nbn:se:kth:diva-220271 (URN)10.1103/PhysRevD.96.103020 (DOI)000416315600003 ()2-s2.0-85037061947 (Scopus ID)
Funder
Swedish Research Council, 638-2013-8993
Note

QC 20180110

Available from: 2018-01-10 Created: 2018-01-10 Last updated: 2018-01-10Bibliographically approved
Organisations
Identifiers
ORCID iD: ORCID iD iconorcid.org/0000-0002-1528-1920

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