http://arxiv.org/abs/1708.09399
Horizonless spacetimes describing highly compact exotic objects with reflecting (instead of absorbing) surfaces have recently attracted much attention from physicists and mathematicians as possible quantum-gravity alternatives to canonical classical black-hole spacetimes. Interestingly, it has recently been proved that spinning compact objects with angular momenta in the sub-critical regime ${\bar a}\equiv J/M^2\leq1$ are characterized by an infinite countable set of surface radii, ${r_{\text{c}}({\bar a};n)}^{n=\infty}{n=1}$, that can support asymptotically flat static configurations made of massless scalar fields. In the present paper we study analytically the physical properties of ultra-spinning exotic compact objects with dimensionless angular momenta in the complementary regime ${\bar a}>1$. It is proved that ultra-spinning reflecting compact objects with dimensionless angular momenta in the super-critical regime $\sqrt{1-[{{m}/{(l+2)}}]^2}\leq|{\bar a}|^{-1}<1$ are characterized by a finite discrete family of surface radii, ${r{\text{c}}({\bar a};n)}^{n=N_{\text{r}}}{n=1}$, distributed symmetrically around $r=M$, that can support spatially regular static configurations of massless scalar fields (here the integers ${l,m}$ are the harmonic indices of the supported static scalar field modes). Interestingly, the largest supporting surface radius $r^{\text{max}}{\text{c}}({\bar a})\equiv \text{max}n{r{\text{c}}({\bar a};n)}$ marks the onset of superradiant instabilities in the composed ultra-spinning-exotic-compact-object-massless-scalar-field system.
S. Hod
Fri, 10 Nov 17
23/55
Comments: 13 pages
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