Near- and sub-solar-mass naked singularities and black holes from transmutation of white dwarfs

Abstract

Recent gravitational wave events have suggested the existence of near-solar-mass black holes which cannot be formed via stellar evolution. This has opened up a tantalizing possibility of future detections of both black holes and naked singularities in this mass range. Existence of naked singularities is a topical and fundamental physics issue, but their formation mechanism is not yet clear. Here, we show that some white dwarfs can realistically transmute into black holes and naked singularities with a wide range of near- and sub-solar-mass values by capturing asymmetric or non-self-annihilating primordial dark matter (PDM) particles. We argue that, while a type Ia supernova due to the accumulation of dark matter at the core of a white dwarf could also be a possibility, the transmutation of a white dwarf into a black hole or a naked singularity is a viable consequence of the capture of non-self-annihilating PDM particles. These white dwarf transmutations can have a significant role in probing the physics of dark matter and compact objects, and could be tested using the rates and locations of mergers over the cosmological time scale.

16 pages, 14 figures, matches published version

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• Challenges and Opportunities of Gravitational Wave Searches above 10 kHz
• Cosmology and nuclear-physics implications of a subsolar gravitational-wave event
• Low Mass Naked Singularities from Dark Core Collapse
• Implications for Pulsar Timing Arrays of Sub-solar Black Hole Detections: From LVK to Einstein Telescope and Cosmic Explorer
• Accretion inside astrophysical objects : Effects of rotation and viscosity
• Spin Precession in magnetized Kerr spacetime
• Magnetically arrested transmutation of a compact star
• Constraining Fermionic Dark Matter with Galactic Neutron Stars