https://doi.org/10.1140/epjc/s10052-021-09120-w
Regular Article – Theoretical Physics
Spherically symmetric analytic solutions and naked singularities in Einstein–Aether theory
1
Coordenação de Astronomia e Astrofísica, Observatório Nacional (ON), 20921-400, Rio de Janeiro, RJ, Brazil
2
Departamento de Física Teórica, Universidade do Estado do Rio de Janeiro (UERJ), 20550-900, Rio de Janeiro, RJ, Brazil
3
Departamento de Física, Universidade Federal do Estado do Rio de Janeiro (UNIRIO), 22290-240, Rio de Janeiro, RJ, Brazil
Received:
9
January
2021
Accepted:
6
April
2021
Published online:
13
April
2021
We analyze all the possible spherically symmetric exterior vacuum solutions allowed by the Einstein–Aether theory with static aether. We show that there are three classes of solutions corresponding to different values of a combination of the free parameters, 
, which are: 
, 
, and 
. We present explicit analytical solutions for 
and 0. The first case has some pathological behavior, while the rest have all singularities at 
and are asymptotically flat spacetimes. For the solutions 
we show that there exist no horizons, neither Killing horizon nor universal horizon, thus we have naked singularities. This characteristic is completely different from general relativity. We briefly discuss the thermodynamics for the case where the horizon exists.
© The Author(s) 2021
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