Naked singularities in quadratic f(R) gravity

Abstract

We find new static, spherically symmetric, and asymptotically flat vacuum solutions without horizon in Starobinsky's quadratic f(R) gravity. We systematically classify these solutions by an asymptotic analysis around the origin and find seven different integer Frobenius families. We numerically solve the exact equations of motion by a double-shooting method and specify boundary conditions by matching the numerical solution to the analytic solution of the linearised field equations in the weak field regime. We find that all integer Frobenius families can be connected to asymptotically flat solutions and trace out lines in the parameter space, allowing to ultimately relate all free parameters to the total mass at infinity.

arXiv comment7 pages, 2 figures; Appendix with explicit form of EOMs added; to appear in PRD

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• The gravitational field of a star in quadratic gravity
• Spherically symmetric configurations in the quadratic $f(R)$ gravity
• Spherically symmetric black holes in metric gravity
• Universality in static spherically symmetric solutions of f(R) gravity