2007
DOI: 10.1088/1475-7516/2007/10/018
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Oscillating axion bubbles as an alternative to supermassive black holes at galactic centers

Abstract: Recent observations of near-infrared and X-ray flares from Sagittarius A * , which is believed to be a supermassive black hole at the Galactic center, show that the source exhibits about 20-minute periodic variability. Here we provide arguments based on a quantitative analysis that supermassive objects at galactic centers may be bubbles of dark matter axions rather than black holes. An oscillating axion bubble can explain periodic variability of Sagittarius A * and yields the axion mass about 0.6 meV which fit… Show more

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Cited by 7 publications
(37 citation statements)
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“…Analysis of Ref. [13] was based on the exponential metric (24) for the static gravitational field rather than general relativity. The present theory of gravity justifies our previous use of the exponential metric.…”
Section: Discussionmentioning
confidence: 99%
See 1 more Smart Citation
“…Analysis of Ref. [13] was based on the exponential metric (24) for the static gravitational field rather than general relativity. The present theory of gravity justifies our previous use of the exponential metric.…”
Section: Discussionmentioning
confidence: 99%
“…In addition, there is approximate Lorentz invariance. Namely, the line element that enters the matter action (7) can be approximately written in the metric (13) as…”
Section: Action For Gravitational Fieldmentioning
confidence: 99%
“…As a result, the bubble radius oscillates between two turning points. The radius of the 4 × 10 6 M ⊙ axion bubble at the center of the Milky Way oscillates with a period of 20 mins between 1 R ⊙ and 1 astronomical unit [5]. This prediction has important implication for capturing the first image of the supermassive object at the center of the Milky Way with the Event Horizon Telescope (EHT) [6].…”
Section: Introductionmentioning
confidence: 96%
“…As a result, the bubble radius oscillates between two turning points. The radius of the 4×10 6 M axion bubble at the center of the Milky Way is predicted to oscillate with a period of about 20 mins between 1 R and 1 astronomical unit (215 R ) [59].…”
Section: Discussionmentioning
confidence: 99%