Black Holes as Beads on Cosmic Strings

Abstract

We consider the possibility of formation of cosmic strings with black holes as beads. We focus on the simplest setup where two black holes are formed on a long cosmic string. It turns out the in absence of a background magnetic field and for observationally viable values for cosmic string tensions, $\mu <2\times 10^{-7}$, the tension of the strut in between the black holes has to be less than the ones that run into infinity. This result does not change if a cosmological constant is present. However if the background magnetic field is turned on, we can have stable setups where the tensions of all cosmic strings are equal. We derive the equilibrium conditions in each of these setups depending on whether the black holes are extremal or non-extremal. We obtain cosmologically acceptable solutions with solar mass black holes and intragalactic strength cosmic magnatic field.

v1: 1+13 pages, 1 figure; v2: References added, typos corrected; v3: Matched the published version

References in corpus (5)

• Cosmological parameters from combining the Lyman-alpha forest with CMB, galaxy clustering and SN constraints
• Relativistic images of Schwarzschild black hole lensing
• Generation of Cosmological Seed Magnetic Fields from Inflation with Cutoff
• Gravitational waves from kinks on infinite cosmic strings
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Cited by in corpus (6)

• Effect of the cosmological constant on the deflection angle by a rotating cosmic string
• Distinguishing a Slowly Accelerating Black Hole by Differential Time Delays of Images
• A closer glance at black hole pair creation
• Lensing Signatures of a Slowly-Accelerated Black Hole
• Black hole pair production on cosmic strings in the presence of a background magnetic field
• Timelike orbits around accelerating black holes