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Rotating black hole solutions for $f(R)$ gravity and Newman Janis Algorithm
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abstract
We show that the $f(R)$-gravity theories with constant Ricci scalar in the Jordan/Einstein frame can be described by Einstein or Einstein-Maxwell gravity with a cosmological term and a modified gravitational constant. We also propose a modified Newmann-Janis algorithm to obtain the rotating axisymmetric solutions for the Einstein/Einstein-Maxwell gravity with a cosmological constant. Using the duality between the two gravity theories we show that the stationary or static solutions for the Einstein/Einstein-Maxwell gravity with a cosmological constant will also be the solutions for the dual $f(R)$-gravity with constant Ricci scalar.
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An obstruction and residual-completion theory for Newman--Janis deformations
Newman–Janis rotations of black-hole seeds are treated as off-shell ansätze whose failure is measured by an obstruction tensor, with a residual-completion criterion deciding when a correction can make them solve the f...
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