Frozen Bardeen-Dirac stars and light ball
Long-Xing Huang, Shi-Xian Sun, Yong-Qiang Wang

TL;DR
This paper introduces frozen Bardeen-Dirac stars, solutions combining magnetic charge and Dirac fields, featuring a light ball inside a critical horizon and distinct from traditional black holes.
Contribution
It presents the novel concept of frozen Bardeen-Dirac stars, solutions with no black hole horizon but with unique light ring and light ball structures, extending black hole physics.
Findings
Existence of frozen Bardeen-Dirac stars with no horizon
Presence of a light ball inside the critical horizon
Critical magnetic charge values determine solution types
Abstract
In this paper, we study solutions of a static spherically symmetric system, which is composed of the coupling with the Bardeen action and two Dirac fields. For the case where only the Bardeen action is present, the magnetic charge can be infinite, then when the magnetic charge is greater than a certain value , there exists a black hole solution, which is called the Bardeen black hole (BBH). However, if the Dirac field is introduced, we find that the magnetic charge can only be smaller than the critical value , in which there is no black hole solution. Moreover, in the region , we find that if the magnetic charge exceeds another critical value (i.e., ), the frequency of the Dirac field can approach zero, and the solution where a critical horizon appears is similar to an extremal black hole outside the critical horizon but has a nonsingular interior.…
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Taxonomy
TopicsAdvanced Differential Geometry Research · Cosmology and Gravitation Theories · Black Holes and Theoretical Physics
