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Radio pulsars in short-period eccentric binary orbits can be used to studyboth gravitational dynamics and binary evolution. The binary system containingPSR J1141$-$6545 includes a massive white dwarf (WD) companion that formedbefore the gravitationally bound young radio pulsar. We observe a temporalevolution of the orbital inclination of this pulsar that we infer is caused bya combination of a Newtonian quadrupole moment and Lense-Thirring precession ofthe orbit resulting from rapid rotation of the WD. Lense-Thirring precession,an effect of relativistic frame-dragging, is a prediction of generalrelativity. This detection is consistent with the evolutionary scenario inwhich the WD accreted matter from the pulsar progenitor, spinning up the WD toa period $< 200$ seconds.

Lense-Thirring frame dragging induced by a fast-rotating white dwarf in a binary pulsar system