A scalar charge on a circular orbit around a topological star radiates energy at a rate given by a new post-Newtonian formula, with the self-force purely radial and constant at leading order.
The dark side of fuzzball geometries
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abstract
Black holes absorb any particle impinging with an impact parameter below a critical value. We show that 2- and 3-charge fuzzball geometries exhibit a similar trapping behaviour for a selected choice of the impact parameter of incoming massless particles. This suggests that the blackness property of black holes arises as a collective effect whereby each micro-state absorbs a specific channel.
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Scalar waves in a Topological Star spacetime: self-force and radiative losses
A scalar charge on a circular orbit around a topological star radiates energy at a rate given by a new post-Newtonian formula, with the self-force purely radial and constant at leading order.