The 511 keV Excess and Primordial Black Holes

Abstract

An excess of 511 keV photons has been detected from the central region of the Milky Way. It has been suggested that the positrons responsible for this signal could be produced through the Hawking evaporation of primordial black holes. After evaluating the constraints from INTEGRAL, COMPTEL, and Voyager 1, we find that black holes in mass range of $\sim (1-4)\times 10^{16}$ g could potentially produce this signal if they make up a small fraction of the total dark matter density. Proposed MeV-scale gamma-ray telescopes such as AMEGO or e-ASTROGAM should be able to test this class of scenarios by measuring the diffuse gamma ray emission from the Milky Way's inner halo.

8 pages, 5 figures

References in corpus (17)

• Baryon effects on the internal structure of LCDM halos in the EAGLE simulations
• Exciting Dark Matter and the INTEGRAL/SPI 511 keV signal
• A mass-dependent density profile for dark matter haloes including the influence of galaxy formation
• Refined Bounds on MeV-scale Thermal Dark Sectors from BBN and the CMB
• A Natural Supersymmetric Model with MeV Dark Matter
• Near future MeV telescopes can discover asteroid-mass primordial black hole dark matter
• Signatures of non-gaussianity in the isocurvature modes of primordial black hole dark matter
• The galactic 511 keV line from electroweak scale WIMPs
• Sterile neutrino dark matter in $B-L$ extension of the standard model and galactic 511 keV line
• Galactic 511 keV line from MeV millicharged dark matter
• Microquasars as sources of positron annihilation radiation
• Diffuse MeV Gamma-rays and Galactic 511 keV Line from Decaying WIMP Dark Matter
• Primordial black holes and the observed Galactic 511 keV line
• Searching for annihilation radiation from SN 1006 with SPI on INTEGRAL
• Pico-charged intermediate particles rescue dark matter interpretation of 511 keV signal
• 511 keV Line Emission from Nearby Spherical Dwarf Galaxies
• Direct detection of Black Holes via electromagnetic radiation

Cited by in corpus (17)

• Primordial Black Holes from Supercooled Phase Transitions
• Primordial Black Holes Arise When The Inflaton Falls
• Updated Constraints on Primordial Black Hole Evaporation
• Primordial Black Holes from Conformal Higgs
• Future Constraints on Primordial Black Holes from XGIS-THESEUS
• The Sensitivity of Future Gamma-Ray Telescopes to Primordial Black Holes
• Through the Looking Glass into the Dark Dimension: Searching for Bulk Black Hole Dark Matter with Microlensing of X-ray Pulsars
• Cosmological Consequences of Domain Walls Biased by Quantum Gravity
• Can a Breakdown of Hawking Evaporation Open a New Mass Window for Primordial Black Holes as Dark Matter?
• The 511-CAM Mission: A Pointed 511 keV Gamma-Ray Telescope with a Focal Plane Detector Made of Stacked Transition Edge Sensor Microcalorimeter Arrays
• Hitchhiker's Guide to the Swampland: The Cosmologist's Handbook to the string-theoretical Swampland Programme
• Corrections to Hawking Radiation from Asteroid Mass Primordial Black Holes: I. Formalism of Dissipative Interactions in Quantum Electrodynamics
• Primordial black holes in Randall-Sundrum: Cosmological signatures
• A trial to understand the supersymmetry relations through extension of the second quantized fermion and boson fields, either to strings or to odd dimensional spaces
• The Dark Dimension, the Swampland, and the Dark Matter Fraction Composed of Primordial Black Holes
• Limits on primordial black holes detectability with Isatis: A BlackHawk tool
• Sensitivities on non-spinning and spinning primordial black hole dark matter with global 21 cm troughs