Observables for moving, extremely charged primordial extremely massive black holes

Abstract

Frampton PLB 835 (2022) put forward the idea that charged, primordial extremely massive black holes between 10 11 and 10 22 solar masses could exist and may explain the observed accelerated expansion of the universe in lieu of dark energy. The extreme charge turns these black holes into naked singularities, making it difficult to derive observable signatures in their proximity. Here, we derive the electro-magnetic and gravitational lensing effects caused by such extreme objects at distances much larger than their extent and discuss the most promising observables to search for their existence in the least cosmology-dependent way. Restricting searches to black holes between 10 12 to 10 14 solar masses, we show that such objects do not cause any totally disruptive catastrophes, like dissociation of neutral hydrogen clouds or proton decay induced by strong electro-magnetic fields. Einstein rings of the order of 10 arcsec and rotation measures of plasma clouds subject to the magnetic fields induced by the black holes are identified as optimum observable signatures of these black holes in current sky surveys.

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

“…In conclusion, it is evident that many WDs could realistically transmute into Kerr naked singularities or BHs, and the uncertainties in the WD parameter values do not change our main conclusions. The naked singularities have been theoretically shown to be viable end products of collapse [11][12][13][14][15][16][17][18]. Some of the collapsed objects could be naked singularities instead of BHs.…”

“…Note that the cosmic censorship hypothesis, conceived by Penrose [10], states that a gravitational singularity would remain hidden inside an event horizon. But, later theoretical works found the tantalizing possibility of existence of naked singularities (see [9,[11][12][13][14][15][16][17][18] and references therein).…”